Merge pull request #2436 from daltonmaag/impl-designspace-v5

Doc/README.md

@@ -19,7 +19,7 @@ You must have a Python 3 interpreter and the `pip` Python package manager instal
 Pull the fontTools project source files, create a Python virtual environment, and then install fontTools and the documentation build dependencies by executing the following commands in the root of the fontTools source repository:
 
 ```
-$ pip install -e . [all]
+$ pip install -e .[all]
 $ pip install -r Doc/docs-requirements.txt
 ```
 

Doc/source/designspaceLib/index.rst

@@ -1,18 +1,217 @@
-##############
-designspaceLib
-##############
+#######################################################
+designspaceLib: Read, write, and edit designspace files
+#######################################################
 
-MutatorMath started out with its own reader and writer for designspaces.
-Since then the use of designspace has broadened and it would be useful
-to have a reader and writer that are independent of a specific system.
+Implements support for reading and manipulating ``designspace`` files.
+Allows the users to define axes, rules, sources, variable fonts and instances,
+and their STAT information.
 
 .. toctree::
    :maxdepth: 1
 
-   readme
+   python
+   xml
    scripting
 
-.. automodule:: fontTools.designspaceLib
-   :inherited-members:
-   :members:
-   :undoc-members:
+
+Notes
+=====
+
+Paths and filenames
+-------------------
+
+A designspace file needs to store many references to UFO files.
+
+-  designspace files can be part of versioning systems and appear on
+   different computers. This means it is not possible to store absolute
+   paths.
+-  So, all paths are relative to the designspace document path.
+-  Using relative paths allows designspace files and UFO files to be
+   **near** each other, and that they can be **found** without enforcing
+   one particular structure.
+-  The **filename** attribute in the ``SourceDescriptor`` and
+   ``InstanceDescriptor`` classes stores the preferred relative path.
+-  The **path** attribute in these objects stores the absolute path. It
+   is calculated from the document path and the relative path in the
+   filename attribute when the object is created.
+-  Only the **filename** attribute is written to file.
+-  Both **filename** and **path** must use forward slashes (``/``) as
+   path separators, even on Windows.
+
+Right before we save we need to identify and respond to the following
+situations:
+
+In each descriptor, we have to do the right thing for the filename
+attribute. Before writing to file, the ``documentObject.updatePaths()``
+method prepares the paths as follows:
+
+**Case 1**
+
+::
+
+    descriptor.filename == None
+    descriptor.path == None
+
+**Action**
+
+-  write as is, descriptors will not have a filename attr. Useless, but
+   no reason to interfere.
+
+**Case 2**
+
+::
+
+    descriptor.filename == "../something"
+    descriptor.path == None
+
+**Action**
+
+-  write as is. The filename attr should not be touched.
+
+**Case 3**
+
+::
+
+    descriptor.filename == None
+    descriptor.path == "~/absolute/path/there"
+
+**Action**
+
+-  calculate the relative path for filename. We're not overwriting some
+   other value for filename, it should be fine.
+
+**Case 4**
+
+::
+
+    descriptor.filename == '../somewhere'
+    descriptor.path == "~/absolute/path/there"
+
+**Action**
+
+-  There is a conflict between the given filename, and the path. The
+   difference could have happened for any number of reasons. Assuming
+   the values were not in conflict when the object was created, either
+   could have changed. We can't guess.
+-  Assume the path attribute is more up to date. Calculate a new value
+   for filename based on the path and the document path.
+
+Recommendation for editors
+--------------------------
+
+-  If you want to explicitly set the **filename** attribute, leave the
+   path attribute empty.
+-  If you want to explicitly set the **path** attribute, leave the
+   filename attribute empty. It will be recalculated.
+-  Use ``documentObject.updateFilenameFromPath()`` to explicitly set the
+   **filename** attributes for all instance and source descriptors.
+
+
+Common Lib Key Registry
+=======================
+
+public.skipExportGlyphs
+-----------------------
+
+This lib key works the same as the UFO lib key with the same name. The
+difference is that applications using a Designspace as the corner stone of the
+font compilation process should use the lib key in that Designspace instead of
+any of the UFOs. If the lib key is empty or not present in the Designspace, all
+glyphs should be exported, regardless of what the same lib key in any of the
+UFOs says.
+
+
+Implementation and differences
+==============================
+
+The designspace format has gone through considerable development.
+
+ -  the format was originally written for MutatorMath.
+ -  the format is now also used in fontTools.varlib.
+ -  not all values are be required by all implementations.
+
+Varlib vs. MutatorMath
+----------------------
+
+There are some differences between the way MutatorMath and fontTools.varlib handle designspaces.
+
+ -  Varlib does not support anisotropic interpolations.
+ -  MutatorMath will extrapolate over the boundaries of
+    the axes. Varlib can not (at the moment).
+ -  Varlib requires much less data to define an instance than
+    MutatorMath.
+ -  The goals of Varlib and MutatorMath are different, so not all
+    attributes are always needed.
+
+
+Rules and generating static UFO instances
+-----------------------------------------
+
+When making instances as UFOs from a designspace with rules, it can
+be useful to evaluate the rules so that the characterset of the UFO
+reflects, as much as possible, the state of a variable font when seen
+at the same location. This can be done by some swapping and renaming of
+glyphs.
+
+While useful for proofing or development work, it should be noted that
+swapping and renaming leaves the UFOs with glyphnames that are no longer
+descriptive. For instance, after a swap ``dollar.bar`` could contain a shape
+without a bar. Also, when the swapped glyphs are part of other GSUB variations
+it can become complex very quickly. So proceed with caution.
+
+ -  Assuming ``rulesProcessingLast = True``:
+ -  We need to swap the glyphs so that the original shape is still available.
+    For instance, if a rule swaps ``a`` for ``a.alt``, a glyph
+    that references ``a`` in a component would then show the new ``a.alt``.
+ -  But that can lead to unexpected results, the two glyphs may have different
+    widths or height. So, glyphs that are not specifically referenced in a rule
+    **should not change appearance**. That means that the implementation that swaps
+    ``a`` and ``a.alt`` also swap all components that reference these
+    glyphs in order to preserve their appearance.
+ -  The swap function also needs to take care of swapping the names in
+    kerning data and any GPOS code.
+
+Version history
+===============
+
+Version 5.0
+-----------
+
+The format was extended to describe the entire design space of a reasonably
+regular font family in one file, with global data about the family to reduce
+repetition in sub-sections. "Reasonably regular" means that the sources and
+instances across the previously multiple Designspace files are positioned on a
+grid and derive their metadata (like style name) in a way that's compatible with
+the STAT model, based on their axis positions. Axis mappings must be the same
+across the entire space.
+
+1. Each axis can have labels attached to stops within the axis range, analogous to the
+   `OpenType STAT <https://docs.microsoft.com/en-us/typography/opentype/spec/stat>`_
+   table. Free-standing labels for locations are also allowed. The data is intended
+   to be compiled into a ``STAT`` table.
+2. The axes can be discrete, to say that they do not interpolate, like a distinctly
+   constructed upright and italic variant of a family.
+3. The data can be used to derive style and PostScript names for instances.
+4. A new ``variable-fonts`` element can subdivide the Designspace into multiple subsets that
+   mix and match the globally available axes. It is possible for these sub-spaces to have
+   a different default location from the global default location. It is required if the
+   Designspace contains a discrete axis and you want to produce a variable font.
+
+What is currently not supported is e.g.
+
+1. A setup where different sources sit at the same logical location in the design space,
+   think "MyFont Regular" and "MyFont SmallCaps Regular". (this situation could be
+   encoded by adding a "SmallCaps" discrete axis, if that makes sense).
+2. Anisotropic locations for axis labels.
+
+Older versions
+--------------
+
+-  In some implementations that preceed Variable Fonts, the `copyInfo`
+   flag in a source indicated the source was to be treated as the default.
+   This is no longer compatible with the assumption that the default font
+   is located on the default value of each axis.
+-  Older implementations did not require axis records to be present in
+   the designspace file. The axis extremes for instance were generated
+   from the locations used in the sources. This is no longer possible.
+

Doc/source/designspaceLib/python.rst

@@ -0,0 +1,199 @@
+################################
+1 DesignSpaceDocument Python API
+################################
+
+An object to read, write and edit interpolation systems for typefaces.
+Define sources, axes, rules, variable fonts and instances.
+
+Get an overview of the available classes in the Class Diagram below:
+
+.. figure:: v5_class_diagram.png
+   :width: 650px
+   :alt: UML class diagram of designspaceLib
+
+   UML class diagram of designspaceLib. Click to enlarge.
+
+.. contents:: Table of contents
+   :local:
+
+.. _designspacedocument-object:
+
+===================
+DesignSpaceDocument
+===================
+
+.. autoclass:: fontTools.designspaceLib::DesignSpaceDocument
+   :members:
+   :undoc-members:
+   :member-order: bysource
+
+
+.. _axis-descriptor-object:
+
+AxisDescriptor
+==============
+
+.. autoclass:: fontTools.designspaceLib::AxisDescriptor
+   :members:
+   :undoc-members:
+   :inherited-members: SimpleDescriptor
+   :member-order: bysource
+
+
+DiscreteAxisDescriptor
+======================
+
+.. autoclass:: fontTools.designspaceLib::DiscreteAxisDescriptor
+   :members:
+   :undoc-members:
+   :inherited-members: SimpleDescriptor
+   :member-order: bysource
+
+
+AxisLabelDescriptor
+-------------------
+
+.. autoclass:: fontTools.designspaceLib::AxisLabelDescriptor
+   :members:
+   :undoc-members:
+   :member-order: bysource
+
+
+LocationLabelDescriptor
+=======================
+
+.. autoclass:: fontTools.designspaceLib::LocationLabelDescriptor
+   :members:
+   :undoc-members:
+   :member-order: bysource
+
+
+RuleDescriptor
+==============
+
+.. autoclass:: fontTools.designspaceLib::RuleDescriptor
+   :members:
+   :undoc-members:
+   :member-order: bysource
+
+
+Evaluating rules
+----------------
+
+.. autofunction:: fontTools.designspaceLib::evaluateRule
+.. autofunction:: fontTools.designspaceLib::evaluateConditions
+.. autofunction:: fontTools.designspaceLib::processRules
+
+
+.. _source-descriptor-object:
+
+SourceDescriptor
+================
+
+.. autoclass:: fontTools.designspaceLib::SourceDescriptor
+   :members:
+   :undoc-members:
+   :member-order: bysource
+
+
+VariableFontDescriptor
+======================
+
+.. autoclass:: fontTools.designspaceLib::VariableFontDescriptor
+   :members:
+   :undoc-members:
+   :member-order: bysource
+
+
+RangeAxisSubsetDescriptor
+-------------------------
+
+.. autoclass:: fontTools.designspaceLib::RangeAxisSubsetDescriptor
+   :members:
+   :undoc-members:
+   :member-order: bysource
+
+
+ValueAxisSubsetDescriptor
+-------------------------
+
+.. autoclass:: fontTools.designspaceLib::ValueAxisSubsetDescriptor
+   :members:
+   :undoc-members:
+   :member-order: bysource
+
+
+.. _instance-descriptor-object:
+
+InstanceDescriptor
+==================
+
+.. autoclass:: fontTools.designspaceLib::InstanceDescriptor
+   :members:
+   :undoc-members:
+   :member-order: bysource
+
+
+.. _subclassing-descriptors:
+
+=======================
+Subclassing descriptors
+=======================
+
+The DesignSpaceDocument can take subclassed Reader and Writer objects.
+This allows you to work with your own descriptors. You could subclass
+the descriptors. But as long as they have the basic attributes the
+descriptor does not need to be a subclass.
+
+.. code:: python
+
+    class MyDocReader(BaseDocReader):
+        axisDescriptorClass = MyAxisDescriptor
+        discreteAxisDescriptorClass = MyDiscreteAxisDescriptor
+        axisLabelDescriptorClass = MyAxisLabelDescriptor
+        locationLabelDescriptorClass = MyLocationLabelDescriptor
+        ruleDescriptorClass = MyRuleDescriptor
+        sourceDescriptorClass = MySourceDescriptor
+        variableFontsDescriptorClass = MyVariableFontDescriptor
+        valueAxisSubsetDescriptorClass = MyValueAxisSubsetDescriptor
+        rangeAxisSubsetDescriptorClass = MyRangeAxisSubsetDescriptor
+        instanceDescriptorClass = MyInstanceDescriptor
+
+    class MyDocWriter(BaseDocWriter):
+        axisDescriptorClass = MyAxisDescriptor
+        discreteAxisDescriptorClass = MyDiscreteAxisDescriptor
+        axisLabelDescriptorClass = MyAxisLabelDescriptor
+        locationLabelDescriptorClass = MyLocationLabelDescriptor
+        ruleDescriptorClass = MyRuleDescriptor
+        sourceDescriptorClass = MySourceDescriptor
+        variableFontsDescriptorClass = MyVariableFontDescriptor
+        valueAxisSubsetDescriptorClass = MyValueAxisSubsetDescriptor
+        rangeAxisSubsetDescriptorClass = MyRangeAxisSubsetDescriptor
+        instanceDescriptorClass = MyInstanceDescriptor
+
+    myDoc = DesignSpaceDocument(MyDocReader, MyDocWriter)
+
+
+==============
+Helper modules
+==============
+
+fontTools.designspaceLib.split
+==============================
+
+See :ref:`Scripting > Working with DesignSpace version 5 <working_with_v5>`
+for more information.
+
+.. automodule:: fontTools.designspaceLib.split
+
+
+fontTools.designspaceLib.stat
+=============================
+
+.. automodule:: fontTools.designspaceLib.stat
+
+
+fontTools.designspaceLib.statNames
+==================================
+
+.. automodule:: fontTools.designspaceLib.statNames

Doc/source/designspaceLib/scripting.rst

@@ -1,6 +1,6 @@
-#######################
-Scripting a designspace
-#######################
+#########################
+3 Scripting a designspace
+#########################
 
 It can be useful to build a designspace with a script rather than
 construct one with an interface like
@@ -88,6 +88,7 @@ OpenType <https://www.microsoft.com/typography/otspec/avar.htm>`__.
 
 .. code:: python
 
+    # (user space, design space), (user space, design space)...
     a1.map = [(0.0, 10.0), (401.0, 66.0), (1000.0, 990.0)]
 
 Make a source object
@@ -241,7 +242,7 @@ This is how you check the default font.
 Generating?
 ***********
 
-You can generate the UFO's with MutatorMath:
+You can generate the UFOs with MutatorMath:
 
 .. code:: python
 
@@ -251,3 +252,39 @@ You can generate the UFO's with MutatorMath:
 -  Assuming the outline data in the masters is compatible.
 
 Or you can use the file in making a **variable font** with varlib.
+
+
+.. _working_with_v5:
+
+**********************************
+Working with DesignSpace version 5
+**********************************
+
+The new version 5 allows "discrete" axes, which do not interpolate across their
+values. This is useful to store in one place family-wide data such as the STAT
+information, however it prevents the usual things done on designspaces that
+interpolate everywhere:
+
+- checking that all sources are compatible for interpolation
+- building variable fonts
+
+In order to allow the above in tools that want to handle designspace v5,
+the :mod:`fontTools.designspaceLib.split` module provides two methods to
+split a designspace into interpolable sub-spaces,
+:func:`splitInterpolable() <fontTools.designspaceLib.split.splitInterpolable>`
+and then
+:func:`splitVariableFonts() <fontTools.designspaceLib.split.splitVariableFonts>`.
+
+
+.. figure:: v5_split_downconvert.png
+   :width: 680px
+   :alt: Example process diagram to check and build DesignSpace 5
+
+   Example process process to check and build Designspace 5.
+
+
+Also, for older tools that don't know about the other version 5 additions such
+as the STAT data fields, the function
+:func:`convert5to4() <fontTools.designspaceLib.split.convert5to4>` allows to
+strip new information from a designspace version 5 to downgrade it to a
+collection of version 4 documents, one per variable font.

Doc/source/designspaceLib/v5_class_diagram.puml

@@ -0,0 +1,292 @@
+@startuml v5_class_diagram
+
+title
+  Designspace v5 Class Diagram
+
+  <size:12>Note: the ""Descriptor"" suffix is omitted from most classes
+end title
+
+' left to right direction
+
+skinparam class {
+BackgroundColor<<New>> PaleGreen
+}
+
+class DesignSpaceDocument {
++ formatVersion: str = None
++ <color:green><b><<New>> elidedFallbackName: str = None
++ rulesProcessingLast: bool = False
++ lib: Dict = {}
+}
+
+note left of DesignSpaceDocument::elidedFallbackName
+STAT Style Attributes Header field ""elidedFallbackNameID""
+end note
+
+abstract class AbstractAxis {
++ tag: str
++ name: str
++ labelNames: Dict[str, str]
++ hidden: bool
++ map: List[Tuple[float, float]]
++ <color:green><b><<New>> axisOrdering: int
+}
+DesignSpaceDocument *-- "*" AbstractAxis: axes >
+note right of AbstractAxis::axisOrdering
+STAT Axis Record field
+end note
+
+class Axis {
++ minimum: float
++ maximum: float
++ default: float
+}
+AbstractAxis <|--- Axis
+note bottom of Axis
+This is the usual
+Axis, with a range
+of values.
+end note
+
+class DiscreteAxis <<New>> {
++ values: List[float]
++ default: float
+}
+AbstractAxis <|--- DiscreteAxis
+note bottom of DiscreteAxis
+A discrete axis is not
+interpolable, e.g.
+Uprights vs Italics, and
+so has "discrete" stops
+instead of a continuous
+range of values.
+end note
+
+Axis .[hidden] DiscreteAxis
+
+class AxisLabel <<New>> {
++ userMinimum: Optional[float]
++ userValue: float
++ userMaximum: Optional[float]
++ name: str
++ elidable: bool
++ olderSibling: bool
++ linkedUserValue: Optional[float]
++ labelNames: Dict[str, str]
+
++ getFormat(): 1 | 2 | 3
+}
+note right of AxisLabel
+Label for a
+stop on an Axis
+(STAT format
+1,2,3)
+end note
+AbstractAxis *-- "*" AxisLabel: <<New>> \n axisLabels >
+
+class LocationLabel <<New>> {
++ name: str
++ location: Dict[str, float]
++ elidable: bool
++ olderSibling: bool
++ labelNames: Dict[str, str]
+}
+note right of LocationLabel
+Label for a
+freestanding
+location
+(STAT format 4)
+end note
+DesignSpaceDocument *--- "*" LocationLabel: <<New>> \n locationLabels >
+
+class Rule {
++ name: str
++ conditionSets: List[ConditionSet]
++ subs: Dict[str, str]
+}
+DesignSpaceDocument *- "*" Rule: rules >
+
+class Source {
++ name: Optional[str]
++ filename: str
++ path: str
++ layerName: Optional[str]
++ <color:brown><s><<Deprecated>> location: Location
++ <color:green><b><<New>> designLocation: AnisotropicLocation
+....
++ font: Optional[Font]
+....
++ familyName: Optional[str]
++ styleName: Optional[str]
++ <color:green><b><<New>> localisedFamilyName: Dict
+....
++ <color:brown><s><<Deprecated>> copyLib: bool
++ <color:brown><s><<Deprecated>> copyInfo: bool
++ <color:brown><s><<Deprecated>> copyGroups: bool
++ <color:brown><s><<Deprecated>> copyFeatures: bool
+....
++ muteKerning: bool
++ muteInfo: bool
++ mutedGlyphNames: List[str]
+----
++ <color:green><b><<New>> getFullDesignLocation(doc)
+}
+DesignSpaceDocument *-- "*" Source: sources >
+note right of Source::localisedFamilyName
+New field to allow generation
+of localised instance names using
+STAT information.
+end note
+note right of Source::copyGroups
+These fields are already not meaningful
+anymore in version 4 (the default source
+will be used as "neutral" for groups, info
+and features. ''copyLib'' can be emulated
+by putting content in the designspace's lib.
+end note
+
+note as NLocSource
+The location of
+sources can still only
+be defined in design
+coordinates, and now
+also by relying on
+axis defaults.
+
+To build the final,
+"full" location, a
+helper method is
+provided, that uses
+axis defaults and
+axis mappings to
+fill in the blanks.
+end note
+NLocSource . Source::designLocation
+NLocSource . Source::getFullDesignLocation
+
+class VariableFont <<New>> {
++ filename: str
++ lib: Dict
+}
+DesignSpaceDocument *--- "*" VariableFont: <<New>> \n variableFonts >
+note right of VariableFont
+A variable font is a
+subset of the designspace
+where everything interpolates
+(and so can be compiled into
+an OpenType variable font).
+end note
+
+abstract class AbstractAxisSubset <<New>> {
++ name: str
+}
+VariableFont *-- "*" AbstractAxisSubset: <<New>> \n axisSubsets >
+
+note right of AbstractAxisSubset
+An axis subset selects a range
+or a spot on each the available
+axes from the whole designspace.
+
+By default, only the default value
+of each axis is used to define the
+variable font.
+
+Continuous axes can be specified
+to include their full range instead;
+or a subset of the range.
+
+Discrete axes can be specified
+to include a different spot than the
+default.
+end note
+
+class RangeAxisSubset <<New>> {
++ userMinimum: float
++ userDefault: float
++ userMaximum: float
+}
+AbstractAxisSubset <|-- RangeAxisSubset
+
+class ValueAxisSubset <<New>> {
++ userValue: float
+}
+AbstractAxisSubset <|-- ValueAxisSubset
+
+class Instance {
++ filename: str
++ path: str
++ <color:brown><s><<Deprecated>> location: Location
++ <color:green><b><<New>> locationLabel: str
++ <color:green><b><<New>> designLocation: AnisotropicLocation
++ <color:green><b><<New>> userLocation: SimpleLocation
+....
++ font: Optional[Font]
+....
++ <color:orange><b><<Changed>> name: Optional[str]
++ <color:orange><b><<Changed>> familyName: Optional[str]
++ <color:orange><b><<Changed>> styleName: Optional[str]
++ <color:orange><b><<Changed>> postScriptFontName: Optional[str]
++ <color:orange><b><<Changed>> styleMapFamilyName: Optional[str]
++ <color:orange><b><<Changed>> styleMapStyleName: Optional[str]
++ localisedFamilyName: Dict
++ localisedStyleName: Dict
++ localisedStyleMapFamilyName: Dict
++ localisedStyleMapStyleName: Dict
+....
++ <color:brown><s><<Deprecated>> glyphs: Dict
++ <color:brown><s><<Deprecated>> kerning: bool
++ <color:brown><s><<Deprecated>> info: bool
+....
++ lib: Dict
+----
++ <color:green><b><<New>> clearLocation()
++ <color:green><b><<New>> getLocationLabelDescriptor(doc)
++ <color:green><b><<New>> getFullDesignLocation(doc)
++ <color:green><b><<New>> getFullUserLocation(doc)
+}
+DesignSpaceDocument *-- "*" Instance: instances >
+note right of Instance::locationLabel
+The location can now alternatively
+be a string = name of a LocationLabel
+(STAT format 4). The instance then
+adopts the location of that label.
+See the Decovar example file.
+end note
+note right of Instance::styleMapStyleName
+All the name field are now optional.
+Their default values will be computed
+using the provided STAT table data
+and the STAT rules from the spec.
+For styleMap{Family,Style}Name, they
+would be computed using the STAT
+""linkedUserValue"" fields.
+end note
+note right of Instance::glyphs
+This attribute has been replaced by rules
+end note
+note right of Instance::kerning
+All instances get kerning and info
+nowadays.
+end note
+
+note as NLocInstance
+The location of instances
+can now be defined using
+either:
+- a STAT LocationLabel
+- design coordinates
+- user coordinates.
+- relying on axis defaults
+
+To build the final, "full"
+location, a few helper
+methods are provided,
+that aggregate data from
+these sources and apply
+the axis mappings.
+end note
+NLocInstance . Instance::designLocation
+NLocInstance . Instance::getFullDesignLocation
+
+@enduml
+

Doc/source/designspaceLib/v5_split_downconvert.puml

@@ -0,0 +1,147 @@
+@startuml v5_split_downconvert
+
+title
+How to split and down-convert a DesignSpace version 5
+<size:14>so that existing tools can work with it
+end title
+
+
+start
+
+#lightgrey:DesignSpace 5.0
+- with STAT data
+- optional instance names
+- with discrete axes
+- with multiple VFs]
+
+note left
+  - STAT data means that compilers will need
+  to write that data to the ouput TTFs
+  - optional instance names means that
+  compilers will need to generate any missing
+  names using the STAT data
+  - discrete axes mean that not all sources
+  are compatible for interpolation
+  - multiple VFs means that compilers will
+  need to output several TTFs for one DS
+end note
+
+split
+split again
+
+:""splitInterpolating()"";
+
+note left
+  - Create one DS document per interpolating
+  sub-space, for example: with a discrete
+  axis for Upright vs Italics, create 2
+  DesignSpaces, one for the Uprights, and
+  one for the Italics.
+  - Expand all missing instance names using
+  the STAT data.
+  - Drop all the STAT data because as we start
+  taking out discrete axes, the sub-documents
+  lose STAT data anyway (only the full
+  document at the start of the process should
+  be used to generate the STAT table)
+end note
+
+split
+
+  #lightgrey:DesignSpace 5.0
+  - (no STAT data)
+  - (explicit instance names)
+  - (at discrete location #1)
+  - with multiple VFs]
+
+  note left
+    All sources in this sub-space are
+    (supposed to be) compatible for
+    interpolation
+  end note
+
+split again
+
+  #lightgrey:DesignSpace 5.0
+  - (no STAT data)
+  - (explicit instance names)
+  - (at discrete location #2)
+  - with multiple VFs]
+  detach
+
+split again
+
+  #lightgrey:etc
+  ...]
+  detach
+
+end split
+
+:check compatibility;
+:build compatible master TTFs with cu2qu;
+
+:""splitVariableFonts()"";
+
+note left
+  Create one DS document per variable font,
+  for example: the above document may
+  describe a weight and width space, out of
+  which we'll build 3 variable fonts:
+  full weight + width, weight only, width only.
+end note
+
+split
+
+  #lightgrey:DesignSpace 5.0
+  - (no STAT data)
+  - (explicit instance names)
+  - (at discrete location #1)
+  - (describing just VF #1)]
+
+  note left
+    This document looks very much
+    like version 4.1, you can just
+    change the version number at
+    the top and feed it to a tool
+    that doesn't know about v5;
+    see ""convert5to4()"".
+  end note
+
+split again
+
+  #lightgrey:DesignSpace 5.0
+  - (no STAT data)
+  - (explicit instance names)
+  - (at discrete location #1)
+  - (describing just VF #2)]
+  detach
+
+split again
+
+  #lightgrey:etc
+  ...]
+  detach
+
+end split
+
+:""varLib.build()"";
+
+#lightgrey:Variable font TTF
+No STAT data]
+
+end split
+
+:""buildVFStatTable()"";
+
+note left
+Apply STAT data using the full document
+from the start of the process + filtering
+entries based on this VF's location
+end note
+
+#lightgrey:Variable font TTF
+With STAT data]
+
+end
+
+@enduml

Lib/fontTools/designspaceLib/split.py

@@ -0,0 +1,424 @@
+"""Allows building all the variable fonts of a DesignSpace version 5 by
+splitting the document into interpolable sub-space, then into each VF.
+"""
+
+from __future__ import annotations
+
+import itertools
+import logging
+import math
+from typing import Any, Callable, Dict, Iterator, List, Tuple
+
+from fontTools.designspaceLib import (
+    AxisDescriptor,
+    DesignSpaceDocument,
+    DiscreteAxisDescriptor,
+    InstanceDescriptor,
+    RuleDescriptor,
+    SimpleLocationDict,
+    SourceDescriptor,
+    VariableFontDescriptor,
+)
+from fontTools.designspaceLib.statNames import StatNames, getStatNames
+from fontTools.designspaceLib.types import (
+    Range,
+    Region,
+    ConditionSet,
+    getVFUserRegion,
+    locationInRegion,
+    regionInRegion,
+    userRegionToDesignRegion,
+)
+
+LOGGER = logging.getLogger(__name__)
+
+MakeInstanceFilenameCallable = Callable[
+    [DesignSpaceDocument, InstanceDescriptor, StatNames], str
+]
+
+
+def defaultMakeInstanceFilename(
+    doc: DesignSpaceDocument, instance: InstanceDescriptor, statNames: StatNames
+) -> str:
+    """Default callable to synthesize an instance filename
+    when makeNames=True, for instances that don't specify an instance name
+    in the designspace. This part of the name generation can be overriden
+    because it's not specified by the STAT table.
+    """
+    familyName = instance.familyName or statNames.familyNames.get("en")
+    styleName = instance.styleName or statNames.styleNames.get("en")
+    return f"{familyName}-{styleName}.ttf"
+
+
+def splitInterpolable(
+    doc: DesignSpaceDocument,
+    makeNames: bool = True,
+    expandLocations: bool = True,
+    makeInstanceFilename: MakeInstanceFilenameCallable = defaultMakeInstanceFilename,
+) -> Iterator[Tuple[SimpleLocationDict, DesignSpaceDocument]]:
+    """Split the given DS5 into several interpolable sub-designspaces.
+    There are as many interpolable sub-spaces as there are combinations of
+    discrete axis values.
+
+    E.g. with axes:
+        - italic (discrete) Upright or Italic
+        - style (discrete) Sans or Serif
+        - weight (continuous) 100 to 900
+
+    There are 4 sub-spaces in which the Weight axis should interpolate:
+    (Upright, Sans), (Upright, Serif), (Italic, Sans) and (Italic, Serif).
+
+    The sub-designspaces still include the full axis definitions and STAT data,
+    but the rules, sources, variable fonts, instances are trimmed down to only
+    keep what falls within the interpolable sub-space.
+
+    Args:
+      - ``makeNames``: Whether to compute the instance family and style
+        names using the STAT data.
+      - ``expandLocations``: Whether to turn all locations into "full"
+        locations, including implicit default axis values where missing.
+      - ``makeInstanceFilename``: Callable to synthesize an instance filename
+        when makeNames=True, for instances that don't specify an instance name
+        in the designspace. This part of the name generation can be overridden
+        because it's not specified by the STAT table.
+
+    .. versionadded:: 5.0
+    """
+    discreteAxes = []
+    interpolableUserRegion: Region = {}
+    for axis in doc.axes:
+        if isinstance(axis, DiscreteAxisDescriptor):
+            discreteAxes.append(axis)
+        else:
+            interpolableUserRegion[axis.name] = Range(
+                axis.minimum, axis.maximum, axis.default
+            )
+    valueCombinations = itertools.product(*[axis.values for axis in discreteAxes])
+    for values in valueCombinations:
+        discreteUserLocation = {
+            discreteAxis.name: value
+            for discreteAxis, value in zip(discreteAxes, values)
+        }
+        subDoc = _extractSubSpace(
+            doc,
+            {**interpolableUserRegion, **discreteUserLocation},
+            keepVFs=True,
+            makeNames=makeNames,
+            expandLocations=expandLocations,
+            makeInstanceFilename=makeInstanceFilename,
+        )
+        yield discreteUserLocation, subDoc
+
+
+def splitVariableFonts(
+    doc: DesignSpaceDocument,
+    makeNames: bool = False,
+    expandLocations: bool = False,
+    makeInstanceFilename: MakeInstanceFilenameCallable = defaultMakeInstanceFilename,
+) -> Iterator[Tuple[str, DesignSpaceDocument]]:
+    """Convert each variable font listed in this document into a standalone
+    designspace. This can be used to compile all the variable fonts from a
+    format 5 designspace using tools that can only deal with 1 VF at a time.
+
+    Args:
+      - ``makeNames``: Whether to compute the instance family and style
+        names using the STAT data.
+      - ``expandLocations``: Whether to turn all locations into "full"
+        locations, including implicit default axis values where missing.
+      - ``makeInstanceFilename``: Callable to synthesize an instance filename
+        when makeNames=True, for instances that don't specify an instance name
+        in the designspace. This part of the name generation can be overridden
+        because it's not specified by the STAT table.
+
+    .. versionadded:: 5.0
+    """
+    # Make one DesignspaceDoc v5 for each variable font
+    for vf in doc.getVariableFonts():
+        vfUserRegion = getVFUserRegion(doc, vf)
+        vfDoc = _extractSubSpace(
+            doc,
+            vfUserRegion,
+            keepVFs=False,
+            makeNames=makeNames,
+            expandLocations=expandLocations,
+            makeInstanceFilename=makeInstanceFilename,
+        )
+        vfDoc.lib = {**vfDoc.lib, **vf.lib}
+        yield vf.name, vfDoc
+
+
+def convert5to4(
+    doc: DesignSpaceDocument,
+) -> Dict[str, DesignSpaceDocument]:
+    """Convert each variable font listed in this document into a standalone
+    format 4 designspace. This can be used to compile all the variable fonts
+    from a format 5 designspace using tools that only know about format 4.
+
+    .. versionadded:: 5.0
+    """
+    vfs = {}
+    for _location, subDoc in splitInterpolable(doc):
+        for vfName, vfDoc in splitVariableFonts(subDoc):
+            vfDoc.formatVersion = "4.1"
+            vfs[vfName] = vfDoc
+    return vfs
+
+
+def _extractSubSpace(
+    doc: DesignSpaceDocument,
+    userRegion: Region,
+    *,
+    keepVFs: bool,
+    makeNames: bool,
+    expandLocations: bool,
+    makeInstanceFilename: MakeInstanceFilenameCallable,
+) -> DesignSpaceDocument:
+    subDoc = DesignSpaceDocument()
+    # Don't include STAT info
+    # FIXME: (Jany) let's think about it. Not include = OK because the point of
+    # the splitting is to build VFs and we'll use the STAT data of the full
+    # document to generate the STAT of the VFs, so "no need" to have STAT data
+    # in sub-docs. Counterpoint: what if someone wants to split this DS for
+    # other purposes?  Maybe for that it would be useful to also subset the STAT
+    # data?
+    # subDoc.elidedFallbackName = doc.elidedFallbackName
+
+    def maybeExpandDesignLocation(object):
+        if expandLocations:
+            return object.getFullDesignLocation(doc)
+        else:
+            return object.designLocation
+
+    for axis in doc.axes:
+        range = userRegion[axis.name]
+        if isinstance(range, Range) and isinstance(axis, AxisDescriptor):
+            subDoc.addAxis(
+                AxisDescriptor(
+                    # Same info
+                    tag=axis.tag,
+                    name=axis.name,
+                    labelNames=axis.labelNames,
+                    hidden=axis.hidden,
+                    # Subset range
+                    minimum=max(range.minimum, axis.minimum),
+                    default=range.default or axis.default,
+                    maximum=min(range.maximum, axis.maximum),
+                    map=[
+                        (user, design)
+                        for user, design in axis.map
+                        if range.minimum <= user <= range.maximum
+                    ],
+                    # Don't include STAT info
+                    axisOrdering=None,
+                    axisLabels=None,
+                )
+            )
+
+    # Don't include STAT info
+    # subDoc.locationLabels = doc.locationLabels
+
+    # Rules: subset them based on conditions
+    designRegion = userRegionToDesignRegion(doc, userRegion)
+    subDoc.rules = _subsetRulesBasedOnConditions(doc.rules, designRegion)
+    subDoc.rulesProcessingLast = doc.rulesProcessingLast
+
+    # Sources: keep only the ones that fall within the kept axis ranges
+    for source in doc.sources:
+        if not locationInRegion(doc.map_backward(source.designLocation), userRegion):
+            continue
+
+        subDoc.addSource(
+            SourceDescriptor(
+                filename=source.filename,
+                path=source.path,
+                font=source.font,
+                name=source.name,
+                designLocation=_filterLocation(
+                    userRegion, maybeExpandDesignLocation(source)
+                ),
+                layerName=source.layerName,
+                familyName=source.familyName,
+                styleName=source.styleName,
+                muteKerning=source.muteKerning,
+                muteInfo=source.muteInfo,
+                mutedGlyphNames=source.mutedGlyphNames,
+            )
+        )
+
+    # Copy family name translations from the old default source to the new default
+    vfDefault = subDoc.findDefault()
+    oldDefault = doc.findDefault()
+    if vfDefault is not None and oldDefault is not None:
+        vfDefault.localisedFamilyName = oldDefault.localisedFamilyName
+
+    # Variable fonts: keep only the ones that fall within the kept axis ranges
+    if keepVFs:
+        # Note: call getVariableFont() to make the implicit VFs explicit
+        for vf in doc.getVariableFonts():
+            vfUserRegion = getVFUserRegion(doc, vf)
+            if regionInRegion(vfUserRegion, userRegion):
+                subDoc.addVariableFont(
+                    VariableFontDescriptor(
+                        name=vf.name,
+                        filename=vf.filename,
+                        axisSubsets=[
+                            axisSubset
+                            for axisSubset in vf.axisSubsets
+                            if isinstance(userRegion[axisSubset.name], Range)
+                        ],
+                        lib=vf.lib,
+                    )
+                )
+
+    # Instances: same as Sources + compute missing names
+    for instance in doc.instances:
+        if not locationInRegion(instance.getFullUserLocation(doc), userRegion):
+            continue
+
+        if makeNames:
+            statNames = getStatNames(doc, instance.getFullUserLocation(doc))
+            familyName = instance.familyName or statNames.familyNames.get("en")
+            styleName = instance.styleName or statNames.styleNames.get("en")
+            subDoc.addInstance(
+                InstanceDescriptor(
+                    filename=instance.filename
+                    or makeInstanceFilename(doc, instance, statNames),
+                    path=instance.path,
+                    font=instance.font,
+                    name=instance.name or f"{familyName} {styleName}",
+                    userLocation={} if expandLocations else instance.userLocation,
+                    designLocation=_filterLocation(
+                        userRegion, maybeExpandDesignLocation(instance)
+                    ),
+                    familyName=familyName,
+                    styleName=styleName,
+                    postScriptFontName=instance.postScriptFontName
+                    or statNames.postScriptFontName,
+                    styleMapFamilyName=instance.styleMapFamilyName
+                    or statNames.styleMapFamilyNames.get("en"),
+                    styleMapStyleName=instance.styleMapStyleName
+                    or statNames.styleMapStyleName,
+                    localisedFamilyName=instance.localisedFamilyName
+                    or statNames.familyNames,
+                    localisedStyleName=instance.localisedStyleName
+                    or statNames.styleNames,
+                    localisedStyleMapFamilyName=instance.localisedStyleMapFamilyName
+                    or statNames.styleMapFamilyNames,
+                    localisedStyleMapStyleName=instance.localisedStyleMapStyleName
+                    or {},
+                    lib=instance.lib,
+                )
+            )
+        else:
+            subDoc.addInstance(
+                InstanceDescriptor(
+                    filename=instance.filename,
+                    path=instance.path,
+                    font=instance.font,
+                    name=instance.name,
+                    userLocation={} if expandLocations else instance.userLocation,
+                    designLocation=_filterLocation(
+                        userRegion, maybeExpandDesignLocation(instance)
+                    ),
+                    familyName=instance.familyName,
+                    styleName=instance.styleName,
+                    postScriptFontName=instance.postScriptFontName,
+                    styleMapFamilyName=instance.styleMapFamilyName,
+                    styleMapStyleName=instance.styleMapStyleName,
+                    localisedFamilyName=instance.localisedFamilyName,
+                    localisedStyleName=instance.localisedStyleName,
+                    localisedStyleMapFamilyName=instance.localisedStyleMapFamilyName,
+                    localisedStyleMapStyleName=instance.localisedStyleMapStyleName,
+                    lib=instance.lib,
+                )
+            )
+
+    subDoc.lib = doc.lib
+
+    return subDoc
+
+
+def _conditionSetFrom(conditionSet: List[Dict[str, Any]]) -> ConditionSet:
+    c: Dict[str, Range] = {}
+    for condition in conditionSet:
+        c[condition["name"]] = Range(
+            condition.get("minimum", -math.inf),
+            condition.get("maximum", math.inf),
+        )
+    return c
+
+
+def _subsetRulesBasedOnConditions(
+    rules: List[RuleDescriptor], designRegion: Region
+) -> List[RuleDescriptor]:
+    # What rules to keep:
+    #  - Keep the rule if any conditionset is relevant.
+    #  - A conditionset is relevant if all conditions are relevant or it is empty.
+    #  - A condition is relevant if
+    #    - axis is point (C-AP),
+    #       - and point in condition's range (C-AP-in)
+    #            (in this case remove the condition because it's always true)
+    #       - else (C-AP-out) whole conditionset can be discarded (condition false
+    #         => conditionset false)
+    #    - axis is range (C-AR),
+    #       - (C-AR-all) and axis range fully contained in condition range: we can
+    #         scrap the condition because it's always true
+    #       - (C-AR-inter) and intersection(axis range, condition range) not empty:
+    #         keep the condition with the smaller range (= intersection)
+    #       - (C-AR-none) else, whole conditionset can be discarded
+    newRules: List[RuleDescriptor] = []
+    for rule in rules:
+        newRule: RuleDescriptor = RuleDescriptor(
+            name=rule.name, conditionSets=[], subs=rule.subs
+        )
+        for conditionset in rule.conditionSets:
+            cs = _conditionSetFrom(conditionset)
+            newConditionset: List[Dict[str, Any]] = []
+            discardConditionset = False
+            for selectionName, selectionValue in designRegion.items():
+                # TODO: Ensure that all(key in conditionset for key in region.keys())?
+                if selectionName not in cs:
+                    # raise Exception("Selection has different axes than the rules")
+                    continue
+                if isinstance(selectionValue, (float, int)):  # is point
+                    # Case C-AP-in
+                    if selectionValue in cs[selectionName]:
+                        pass  # always matches, conditionset can stay empty for this one.
+                    # Case C-AP-out
+                    else:
+                        discardConditionset = True
+                else:  # is range
+                    # Case C-AR-all
+                    if selectionValue in cs[selectionName]:
+                        pass  # always matches, conditionset can stay empty for this one.
+                    else:
+                        intersection = cs[selectionName].intersection(selectionValue)
+                        # Case C-AR-inter
+                        if intersection is not None:
+                            newConditionset.append(
+                                {
+                                    "name": selectionName,
+                                    "minimum": intersection.minimum,
+                                    "maximum": intersection.maximum,
+                                }
+                            )
+                        # Case C-AR-none
+                        else:
+                            discardConditionset = True
+            if not discardConditionset:
+                newRule.conditionSets.append(newConditionset)
+        if newRule.conditionSets:
+            newRules.append(newRule)
+
+    return newRules
+
+
+def _filterLocation(
+    userRegion: Region,
+    location: Dict[str, float],
+) -> Dict[str, float]:
+    return {
+        name: value
+        for name, value in location.items()
+        if name in userRegion and isinstance(userRegion[name], Range)
+    }

Lib/fontTools/designspaceLib/statNames.py

@@ -0,0 +1,224 @@
+"""Compute name information for a given location in user-space coordinates
+using STAT data. This can be used to fill-in automatically the names of an
+instance:
+
+.. code:: python
+
+    instance = doc.instances[0]
+    names = getStatNames(doc, instance.getFullUserLocation(doc))
+    print(names.styleNames)
+"""
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Dict, Optional, Tuple, Union
+import logging
+
+from fontTools.designspaceLib import (
+    AxisDescriptor,
+    AxisLabelDescriptor,
+    DesignSpaceDocument,
+    DesignSpaceDocumentError,
+    DiscreteAxisDescriptor,
+    SimpleLocationDict,
+    SourceDescriptor,
+)
+
+LOGGER = logging.getLogger(__name__)
+
+# TODO(Python 3.8): use Literal
+# RibbiStyleName = Union[Literal["regular"], Literal["bold"], Literal["italic"], Literal["bold italic"]]
+RibbiStyle = str
+BOLD_ITALIC_TO_RIBBI_STYLE = {
+    (False, False): "regular",
+    (False, True): "italic",
+    (True, False): "bold",
+    (True, True): "bold italic",
+}
+
+
+@dataclass
+class StatNames:
+    """Name data generated from the STAT table information."""
+
+    familyNames: Dict[str, str]
+    styleNames: Dict[str, str]
+    postScriptFontName: Optional[str]
+    styleMapFamilyNames: Dict[str, str]
+    styleMapStyleName: Optional[RibbiStyle]
+
+
+
+def getStatNames(
+    doc: DesignSpaceDocument, userLocation: SimpleLocationDict
+) -> StatNames:
+    """Compute the family, style, PostScript names of the given ``userLocation``
+    using the document's STAT information.
+
+    Also computes localizations.
+
+    If not enough STAT data is available for a given name, either its dict of
+    localized names will be empty (family and style names), or the name will be
+    None (PostScript name).
+
+    .. versionadded:: 5.0
+    """
+    familyNames: Dict[str, str] = {}
+    defaultSource: Optional[SourceDescriptor] = doc.findDefault()
+    if defaultSource is None:
+        LOGGER.warning("Cannot determine default source to look up family name.")
+    elif defaultSource.familyName is None:
+        LOGGER.warning(
+            "Cannot look up family name, assign the 'familyname' attribute to the default source."
+        )
+    else:
+        familyNames = {
+            "en": defaultSource.familyName,
+            **defaultSource.localisedFamilyName,
+        }
+
+    styleNames: Dict[str, str] = {}
+    # If a free-standing label matches the location, use it for name generation.
+    label = doc.labelForUserLocation(userLocation)
+    if label is not None:
+        styleNames = {"en": label.name, **label.labelNames}
+    # Otherwise, scour the axis labels for matches.
+    else:
+        # Gather all languages in which at least one translation is provided
+        # Then build names for all these languages, but fallback to English
+        # whenever a translation is missing.
+        labels = _getAxisLabelsForUserLocation(doc.axes, userLocation)
+        languages = set(language for label in labels for language in label.labelNames)
+        languages.add("en")
+        for language in languages:
+            styleName = " ".join(
+                label.labelNames.get(language, label.defaultName)
+                for label in labels
+                if not label.elidable
+            )
+            if not styleName and doc.elidedFallbackName is not None:
+                styleName = doc.elidedFallbackName
+            styleNames[language] = styleName
+
+    postScriptFontName = None
+    if "en" in familyNames and "en" in styleNames:
+        postScriptFontName = f"{familyNames['en']}-{styleNames['en']}".replace(" ", "")
+
+    styleMapStyleName, regularUserLocation = _getRibbiStyle(doc, userLocation)
+
+    styleNamesForStyleMap = styleNames
+    if regularUserLocation != userLocation:
+        regularStatNames = getStatNames(doc, regularUserLocation)
+        styleNamesForStyleMap = regularStatNames.styleNames
+
+    styleMapFamilyNames = {}
+    for language in set(familyNames).union(styleNames.keys()):
+        familyName = familyNames.get(language, familyNames["en"])
+        styleName = styleNamesForStyleMap.get(language, styleNamesForStyleMap["en"])
+        styleMapFamilyNames[language] = (familyName + " " + styleName).strip()
+
+    return StatNames(
+        familyNames=familyNames,
+        styleNames=styleNames,
+        postScriptFontName=postScriptFontName,
+        styleMapFamilyNames=styleMapFamilyNames,
+        styleMapStyleName=styleMapStyleName,
+    )
+
+
+def _getSortedAxisLabels(
+    axes: list[Union[AxisDescriptor, DiscreteAxisDescriptor]],
+) -> Dict[str, list[AxisLabelDescriptor]]:
+    """Returns axis labels sorted by their ordering, with unordered ones appended as
+    they are listed."""
+
+    # First, get the axis labels with explicit ordering...
+    sortedAxes = sorted(
+        (axis for axis in axes if axis.axisOrdering is not None),
+        key=lambda a: a.axisOrdering,
+    )
+    sortedLabels: Dict[str, list[AxisLabelDescriptor]] = {
+        axis.name: axis.axisLabels for axis in sortedAxes
+    }
+
+    # ... then append the others in the order they appear.
+    # NOTE: This relies on Python 3.7+ dict's preserved insertion order.
+    for axis in axes:
+        if axis.axisOrdering is None:
+            sortedLabels[axis.name] = axis.axisLabels
+
+    return sortedLabels
+
+
+def _getAxisLabelsForUserLocation(
+    axes: list[Union[AxisDescriptor, DiscreteAxisDescriptor]],
+    userLocation: SimpleLocationDict,
+) -> list[AxisLabelDescriptor]:
+    labels: list[AxisLabelDescriptor] = []
+
+    allAxisLabels = _getSortedAxisLabels(axes)
+    if allAxisLabels.keys() != userLocation.keys():
+        LOGGER.warning(
+            f"Mismatch between user location '{userLocation.keys()}' and available "
+            f"labels for '{allAxisLabels.keys()}'."
+        )
+
+    for axisName, axisLabels in allAxisLabels.items():
+        userValue = userLocation[axisName]
+        label: Optional[AxisLabelDescriptor] = next(
+            (
+                l
+                for l in axisLabels
+                if l.userValue == userValue
+                or (
+                    l.userMinimum is not None
+                    and l.userMaximum is not None
+                    and l.userMinimum <= userValue <= l.userMaximum
+                )
+            ),
+            None,
+        )
+        if label is None:
+            LOGGER.debug(
+                f"Document needs a label for axis '{axisName}', user value '{userValue}'."
+            )
+        else:
+            labels.append(label)
+
+    return labels
+
+
+def _getRibbiStyle(
+    self: DesignSpaceDocument, userLocation: SimpleLocationDict
+) -> Tuple[RibbiStyle, SimpleLocationDict]:
+    """Compute the RIBBI style name of the given user location,
+    return the location of the matching Regular in the RIBBI group.
+
+    .. versionadded:: 5.0
+    """
+    regularUserLocation = {}
+    axes_by_tag = {axis.tag: axis for axis in self.axes}
+
+    bold: bool = False
+    italic: bool = False
+
+    axis = axes_by_tag.get("wght")
+    if axis is not None:
+        for regular_label in axis.axisLabels:
+            if regular_label.linkedUserValue == userLocation[axis.name]:
+                regularUserLocation[axis.name] = regular_label.userValue
+                bold = True
+                break
+
+    axis = axes_by_tag.get("ital") or axes_by_tag.get("slnt")
+    if axis is not None:
+        for urpright_label in axis.axisLabels:
+            if urpright_label.linkedUserValue == userLocation[axis.name]:
+                regularUserLocation[axis.name] = urpright_label.userValue
+                italic = True
+                break
+
+    return BOLD_ITALIC_TO_RIBBI_STYLE[bold, italic], {
+        **userLocation,
+        **regularUserLocation,
+    }

Lib/fontTools/designspaceLib/types.py

@@ -0,0 +1,122 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Dict, List, Optional, Union
+
+from fontTools.designspaceLib import (
+    DesignSpaceDocument,
+    RangeAxisSubsetDescriptor,
+    SimpleLocationDict,
+    VariableFontDescriptor,
+)
+
+
+def clamp(value, minimum, maximum):
+    return min(max(value, minimum), maximum)
+
+
+@dataclass
+class Range:
+    minimum: float
+    """Inclusive minimum of the range."""
+    maximum: float
+    """Inclusive maximum of the range."""
+    default: float = 0
+    """Default value"""
+
+    def __post__init__(self):
+        self.minimum, self.maximum = sorted((self.minimum, self.maximum))
+        self.default = clamp(self.default, self.minimum, self.maximum)
+
+    def __contains__(self, value: Union[float, Range]) -> bool:
+        if isinstance(value, Range):
+            return self.minimum <= value.minimum and value.maximum <= self.maximum
+        return self.minimum <= value <= self.maximum
+
+    def intersection(self, other: Range) -> Optional[Range]:
+        if self.maximum < other.minimum or self.minimum > other.maximum:
+            return None
+        else:
+            return Range(
+                max(self.minimum, other.minimum),
+                min(self.maximum, other.maximum),
+                self.default,  # We don't care about the default in this use-case
+            )
+
+
+# A region selection is either a range or a single value, as a Designspace v5
+# axis-subset element only allows a single discrete value or a range for a
+# variable-font element.
+Region = Dict[str, Union[Range, float]]
+
+# A conditionset is a set of named ranges.
+ConditionSet = Dict[str, Range]
+
+# A rule is a list of conditionsets where any has to be relevant for the whole rule to be relevant.
+Rule = List[ConditionSet]
+Rules = Dict[str, Rule]
+
+
+def locationInRegion(location: SimpleLocationDict, region: Region) -> bool:
+    for name, value in location.items():
+        if name not in region:
+            return False
+        regionValue = region[name]
+        if isinstance(regionValue, (float, int)):
+            if value != regionValue:
+                return False
+        else:
+            if value not in regionValue:
+                return False
+    return True
+
+
+def regionInRegion(region: Region, superRegion: Region) -> bool:
+    for name, value in region.items():
+        if not name in superRegion:
+            return False
+        superValue = superRegion[name]
+        if isinstance(superValue, (float, int)):
+            if value != superValue:
+                return False
+        else:
+            if value not in superValue:
+                return False
+    return True
+
+
+def userRegionToDesignRegion(doc: DesignSpaceDocument, userRegion: Region) -> Region:
+    designRegion = {}
+    for name, value in userRegion.items():
+        axis = doc.getAxis(name)
+        if isinstance(value, (float, int)):
+            designRegion[name] = axis.map_forward(value)
+        else:
+            designRegion[name] = Range(
+                axis.map_forward(value.minimum),
+                axis.map_forward(value.maximum),
+                axis.map_forward(value.default),
+            )
+    return designRegion
+
+
+def getVFUserRegion(doc: DesignSpaceDocument, vf: VariableFontDescriptor) -> Region:
+    vfUserRegion: Region = {}
+    # For each axis, 2 cases:
+    #  - it has a range = it's an axis in the VF DS
+    #  - it's a single location = use it to know which rules should apply in the VF
+    for axisSubset in vf.axisSubsets:
+        axis = doc.getAxis(axisSubset.name)
+        if isinstance(axisSubset, RangeAxisSubsetDescriptor):
+            vfUserRegion[axis.name] = Range(
+                max(axisSubset.userMinimum, axis.minimum),
+                min(axisSubset.userMaximum, axis.maximum),
+                axisSubset.userDefault or axis.default,
+            )
+        else:
+            vfUserRegion[axis.name] = axisSubset.userValue
+    # Any axis not mentioned explicitly has a single location = default value
+    for axis in doc.axes:
+        if axis.name not in vfUserRegion:
+            vfUserRegion[axis.name] = axis.default
+    return vfUserRegion

Lib/fontTools/varLib/__init__.py

@@ -18,6 +18,7 @@ Then you can make a variable-font this way:
 
 API *will* change in near future.
 """
+from typing import List
 from fontTools.misc.vector import Vector
 from fontTools.misc.roundTools import noRound, otRound
 from fontTools.misc.textTools import Tag, tostr
@@ -33,7 +34,9 @@ from fontTools.varLib.merger import VariationMerger
 from fontTools.varLib.mvar import MVAR_ENTRIES
 from fontTools.varLib.iup import iup_delta_optimize
 from fontTools.varLib.featureVars import addFeatureVariations
-from fontTools.designspaceLib import DesignSpaceDocument
+from fontTools.designspaceLib import DesignSpaceDocument, InstanceDescriptor
+from fontTools.designspaceLib.split import splitInterpolable, splitVariableFonts
+from fontTools.varLib.stat import buildVFStatTable
 from functools import partial
 from collections import OrderedDict, namedtuple
 import os.path
@@ -53,7 +56,7 @@ FEAVAR_FEATURETAG_LIB_KEY = "com.github.fonttools.varLib.featureVarsFeatureTag"
 # Creation routines
 #
 
-def _add_fvar(font, axes, instances):
+def _add_fvar(font, axes, instances: List[InstanceDescriptor]):
 	"""
 	Add 'fvar' table to font.
 
@@ -81,7 +84,8 @@ def _add_fvar(font, axes, instances):
 		fvar.axes.append(axis)
 
 	for instance in instances:
-		coordinates = instance.location
+		# Filter out discrete axis locations
+		coordinates = {name: value for name, value in instance.location.items() if name in axes}
 
 		if "en" not in instance.localisedStyleName:
 			if not instance.styleName:
@@ -198,11 +202,10 @@ def _add_avar(font, axes):
 
 	return avar
 
-def _add_stat(font, axes):
-	# for now we just get the axis tags and nameIDs from the fvar,
-	# so we can reuse the same nameIDs which were defined in there.
-	# TODO make use of 'axes' once it adds style attributes info:
-	# https://github.com/LettError/designSpaceDocument/issues/8
+def _add_stat(font):
+	# Note: this function only gets called by old code that calls `build()`
+	# directly. Newer code that wants to benefit from STAT data from the
+	# designspace should call `build_many()`
 
 	if "STAT" in font:
 		return
@@ -759,7 +762,8 @@ def load_designspace(designspace):
 	# Check all master and instance locations are valid and fill in defaults
 	for obj in masters+instances:
 		obj_name = obj.name or obj.styleName or ''
-		loc = obj.location
+		loc = obj.getFullDesignLocation(ds)
+		obj.designLocation = loc
 		if loc is None:
 			raise VarLibValidationError(
 				f"Source or instance '{obj_name}' has no location."
@@ -770,10 +774,6 @@ def load_designspace(designspace):
 					f"Location axis '{axis_name}' unknown for '{obj_name}'."
 				)
 		for axis_name,axis in axes.items():
-			if axis_name not in loc:
-				# NOTE: `axis.default` is always user-space, but `obj.location` always design-space.
-				loc[axis_name] = axis.map_forward(axis.default)
-			else:
 			v = axis.map_backward(loc[axis_name])
 			if not (axis.minimum <= v <= axis.maximum):
 				raise VarLibValidationError(
@@ -785,7 +785,7 @@ def load_designspace(designspace):
 
 	# Normalize master locations
 
-	internal_master_locs = [o.location for o in masters]
+	internal_master_locs = [o.getFullDesignLocation(ds) for o in masters]
 	log.info("Internal master locations:\n%s", pformat(internal_master_locs))
 
 	# TODO This mapping should ideally be moved closer to logic in _add_fvar/avar
@@ -865,6 +865,38 @@ def set_default_weight_width_slant(font, location):
 			font["post"].italicAngle = italicAngle
 
 
+def build_many(designspace: DesignSpaceDocument, master_finder=lambda s:s, exclude=[], optimize=True, skip_vf=lambda vf_name: False):
+	"""
+	Build variable fonts from a designspace file, version 5 which can define
+	several VFs, or version 4 which has implicitly one VF covering the whole doc.
+
+	If master_finder is set, it should be a callable that takes master
+	filename as found in designspace file and map it to master font
+	binary as to be opened (eg. .ttf or .otf).
+
+	skip_vf can be used to skip building some of the variable fonts defined in
+	the input designspace. It's a predicate that takes as argument the name
+	of the variable font and returns `bool`.
+
+	Always returns a Dict[str, TTFont] keyed by VariableFontDescriptor.name
+	"""
+	res = {}
+	for _location, subDoc in splitInterpolable(designspace):
+		for name, vfDoc in splitVariableFonts(subDoc):
+			if skip_vf(name):
+				log.debug(f"Skipping variable TTF font: {name}")
+				continue
+			vf = build(
+				vfDoc,
+				master_finder,
+				exclude=list(exclude) + ["STAT"],
+				optimize=optimize
+			)[0]
+			if "STAT" not in exclude:
+				buildVFStatTable(vf, designspace, name)
+			res[name] = vf
+	return res
+
 def build(designspace, master_finder=lambda s:s, exclude=[], optimize=True):
 	"""
 	Build variation font from a designspace file.
@@ -898,7 +930,7 @@ def build(designspace, master_finder=lambda s:s, exclude=[], optimize=True):
 	# TODO append masters as named-instances as well; needs .designspace change.
 	fvar = _add_fvar(vf, ds.axes, ds.instances)
 	if 'STAT' not in exclude:
-		_add_stat(vf, ds.axes)
+		_add_stat(vf)
 	if 'avar' not in exclude:
 		_add_avar(vf, ds.axes)
 

Lib/fontTools/varLib/stat.py

@@ -0,0 +1,142 @@
+"""Extra methods for DesignSpaceDocument to generate its STAT table data."""
+
+from __future__ import annotations
+
+from typing import Dict, List, Union
+
+import fontTools.otlLib.builder
+from fontTools.designspaceLib import (
+    AxisLabelDescriptor,
+    DesignSpaceDocument,
+    DesignSpaceDocumentError,
+    LocationLabelDescriptor,
+)
+from fontTools.designspaceLib.types import Region, getVFUserRegion, locationInRegion
+from fontTools.ttLib import TTFont
+
+
+def buildVFStatTable(ttFont: TTFont, doc: DesignSpaceDocument, vfName: str) -> None:
+    """Build the STAT table for the variable font identified by its name in
+    the given document.
+
+    Knowing which variable we're building STAT data for is needed to subset
+    the STAT locations to only include what the variable font actually ships.
+
+    .. versionadded:: 5.0
+
+    .. seealso::
+        - :func:`getStatAxes()`
+        - :func:`getStatLocations()`
+        - :func:`fontTools.otlLib.builder.buildStatTable()`
+    """
+    for vf in doc.getVariableFonts():
+        if vf.name == vfName:
+            break
+    else:
+        raise DesignSpaceDocumentError(
+            f"Cannot find the variable font by name {vfName}"
+        )
+
+    region = getVFUserRegion(doc, vf)
+
+    return fontTools.otlLib.builder.buildStatTable(
+        ttFont,
+        getStatAxes(doc, region),
+        getStatLocations(doc, region),
+        doc.elidedFallbackName if doc.elidedFallbackName is not None else 2,
+    )
+
+
+def getStatAxes(doc: DesignSpaceDocument, userRegion: Region) -> List[Dict]:
+    """Return a list of axis dicts suitable for use as the ``axes``
+    argument to :func:`fontTools.otlLib.builder.buildStatTable()`.
+
+    .. versionadded:: 5.0
+    """
+    # First, get the axis labels with explicit ordering
+    # then append the others in the order they appear.
+    maxOrdering = max(
+        (axis.axisOrdering for axis in doc.axes if axis.axisOrdering is not None),
+        default=-1,
+    )
+    axisOrderings = []
+    for axis in doc.axes:
+        if axis.axisOrdering is not None:
+            axisOrderings.append(axis.axisOrdering)
+        else:
+            maxOrdering += 1
+            axisOrderings.append(maxOrdering)
+    return [
+        dict(
+            tag=axis.tag,
+            name={"en": axis.name, **axis.labelNames},
+            ordering=ordering,
+            values=[
+                _axisLabelToStatLocation(label)
+                for label in axis.axisLabels
+                if locationInRegion({axis.name: label.userValue}, userRegion)
+            ],
+        )
+        for axis, ordering in zip(doc.axes, axisOrderings)
+    ]
+
+
+def getStatLocations(doc: DesignSpaceDocument, userRegion: Region) -> List[Dict]:
+    """Return a list of location dicts suitable for use as the ``locations``
+    argument to :func:`fontTools.otlLib.builder.buildStatTable()`.
+
+    .. versionadded:: 5.0
+    """
+    axesByName = {axis.name: axis for axis in doc.axes}
+    return [
+        dict(
+            name={"en": label.name, **label.labelNames},
+            # Location in the designspace is keyed by axis name
+            # Location in buildStatTable by axis tag
+            location={
+                axesByName[name].tag: value
+                for name, value in label.getFullUserLocation(doc).items()
+            },
+            flags=_labelToFlags(label),
+        )
+        for label in doc.locationLabels
+        if locationInRegion(label.getFullUserLocation(doc), userRegion)
+    ]
+
+
+def _labelToFlags(label: Union[AxisLabelDescriptor, LocationLabelDescriptor]) -> int:
+    flags = 0
+    if label.olderSibling:
+        flags |= 1
+    if label.elidable:
+        flags |= 2
+    return flags
+
+
+def _axisLabelToStatLocation(
+    label: AxisLabelDescriptor,
+) -> Dict:
+    label_format = label.getFormat()
+    name = {"en": label.name, **label.labelNames}
+    flags = _labelToFlags(label)
+    if label_format == 1:
+        return dict(name=name, value=label.userValue, flags=flags)
+    if label_format == 3:
+        return dict(
+            name=name,
+            value=label.userValue,
+            linkedValue=label.linkedUserValue,
+            flags=flags,
+        )
+    if label_format == 2:
+        res = dict(
+            name=name,
+            nominalValue=label.userValue,
+            flags=flags,
+        )
+        if label.userMinimum is not None:
+            res["rangeMinValue"] = label.userMinimum
+        if label.userMaximum is not None:
+            res["rangeMaxValue"] = label.userMaximum
+        return res
+    raise NotImplementedError("Unknown STAT label format")

Tests/designspaceLib/data/convert5to4_output/AktivGroteskVF_Italics_Wght.designspace

@@ -0,0 +1,114 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="4.1">
+  <axes>
+    <axis tag="wght" name="Weight" minimum="100" maximum="900" default="400">
+      <map input="100" output="22"/>
+      <map input="200" output="38"/>
+      <map input="300" output="57"/>
+      <map input="400" output="84"/>
+      <map input="500" output="98"/>
+      <map input="600" output="115"/>
+      <map input="700" output="133"/>
+      <map input="800" output="158"/>
+      <map input="900" output="185"/>
+    </axis>
+  </axes>
+  <rules processing="last">
+    <rule name="BRACKET.CYR">
+      <sub name="ghe.loclSRB" with="ghe.ital.loclSRB"/>
+      <sub name="ghe.loclMKD" with="ghe.ital.loclMKD"/>
+      <sub name="de.loclMKDSRB" with="de.ital.loclMKDSRB"/>
+      <sub name="pe.loclMKDSRB" with="pe.ital.loclMKDSRB"/>
+      <sub name="te.loclMKDSRB" with="te.ital.loclMKDSRB"/>
+      <sub name="gje.loclMKD" with="gje.ital.loclMKD"/>
+      <sub name="sha.loclMKDSRB" with="sha.ital.loclMKDSRB"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="../AktivGrotesk_HairIt.ufo" name="Aktiv Grotesk Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic {126,100,1}" layer="{126,100,1}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_BlkIt.ufo" name="Aktiv Grotesk Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="Aktiv Grotesk Hair Italic" familyname="Aktiv Grotesk" stylename="Hair Italic" filename="../instances/AktivGrotesk_HairIt.ufo" postscriptfontname="AktivGrotesk-HairItalic" stylemapfamilyname="Aktiv Grotesk Hair" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Thin Italic" familyname="Aktiv Grotesk" stylename="Thin Italic" filename="../instances/AktivGrotesk_ThIt.ufo" postscriptfontname="AktivGrotesk-ThinItalic" stylemapfamilyname="Aktiv Grotesk Thin" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Light Italic" familyname="Aktiv Grotesk" stylename="Light Italic" filename="../instances/AktivGrotesk_LtIt.ufo" postscriptfontname="AktivGrotesk-LightItalic" stylemapfamilyname="Aktiv Grotesk Light" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Italic" familyname="Aktiv Grotesk" stylename="Italic" filename="../instances/AktivGrotesk_It.ufo" postscriptfontname="AktivGrotesk-Italic" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Medium Italic" familyname="Aktiv Grotesk" stylename="Medium Italic" filename="../instances/AktivGrotesk_MdIt.ufo" postscriptfontname="AktivGrotesk-MediumItalic" stylemapfamilyname="Aktiv Grotesk Medium" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk SemiBold Italic" familyname="Aktiv Grotesk" stylename="SemiBold Italic" filename="../../build/instances/AktivGrotesk_SBdIt.ufo" postscriptfontname="AktivGrotesk-SemiBoldItalic" stylemapfamilyname="Aktiv Grotesk SemiBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Bold Italic" familyname="Aktiv Grotesk" stylename="Bold Italic" filename="../instances/AktivGrotesk_BdIt.ufo" postscriptfontname="AktivGrotesk-BoldItalic" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk XBold Italic" familyname="Aktiv Grotesk" stylename="XBold Italic" filename="../instances/AktivGrotesk_XBdIt.ufo" postscriptfontname="AktivGrotesk-XBoldItalic" stylemapfamilyname="Aktiv Grotesk XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Black Italic" familyname="Aktiv Grotesk" stylename="Black Italic" filename="../instances/AktivGrotesk_BlkIt.ufo" postscriptfontname="AktivGrotesk-BlackItalic" stylemapfamilyname="Aktiv Grotesk Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/convert5to4_output/AktivGroteskVF_Italics_WghtWdth.designspace

@@ -0,0 +1,316 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="4.1">
+  <axes>
+    <axis tag="wght" name="Weight" minimum="100" maximum="900" default="400">
+      <map input="100" output="22"/>
+      <map input="200" output="38"/>
+      <map input="300" output="57"/>
+      <map input="400" output="84"/>
+      <map input="500" output="98"/>
+      <map input="600" output="115"/>
+      <map input="700" output="133"/>
+      <map input="800" output="158"/>
+      <map input="900" output="185"/>
+    </axis>
+    <axis tag="wdth" name="Width" minimum="75" maximum="125" default="100"/>
+  </axes>
+  <rules processing="last">
+    <rule name="BRACKET.CYR">
+      <sub name="ghe.loclSRB" with="ghe.ital.loclSRB"/>
+      <sub name="ghe.loclMKD" with="ghe.ital.loclMKD"/>
+      <sub name="de.loclMKDSRB" with="de.ital.loclMKDSRB"/>
+      <sub name="pe.loclMKDSRB" with="pe.ital.loclMKDSRB"/>
+      <sub name="te.loclMKDSRB" with="te.ital.loclMKDSRB"/>
+      <sub name="gje.loclMKD" with="gje.ital.loclMKD"/>
+      <sub name="sha.loclMKDSRB" with="sha.ital.loclMKDSRB"/>
+    </rule>
+    <rule name="BRACKET.116.185">
+      <conditionset>
+        <condition name="Weight" minimum="116" maximum="185"/>
+        <condition name="Width" minimum="75" maximum="97.5"/>
+      </conditionset>
+      <sub name="cent" with="cent.BRACKET.130"/>
+      <sub name="dollar" with="dollar.BRACKET.130"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="../AktivGroteskCd_HairIt.ufo" name="Aktiv Grotesk Cd Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_HairIt.ufo" name="Aktiv Grotesk Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_HairIt.ufo" name="Aktiv Grotesk Ex Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_It.ufo" name="Aktiv Grotesk Cd Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic {126,100,1}" layer="{126,100,1}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_It.ufo" name="Aktiv Grotesk Ex Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_BlkIt.ufo" name="Aktiv Grotesk Cd Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_BlkIt.ufo" name="Aktiv Grotesk Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_BlkIt.ufo" name="Aktiv Grotesk Ex Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="Aktiv Grotesk Cd Hair Italic" familyname="Aktiv Grotesk" stylename="Cd Hair Italic" filename="../instances/AktivGroteskCd_HairIt.ufo" postscriptfontname="AktivGrotesk-CdHairItalic" stylemapfamilyname="Aktiv Grotesk Cd Hair" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Hair Italic" familyname="Aktiv Grotesk" stylename="Hair Italic" filename="../instances/AktivGrotesk_HairIt.ufo" postscriptfontname="AktivGrotesk-HairItalic" stylemapfamilyname="Aktiv Grotesk Hair" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Hair Italic" familyname="Aktiv Grotesk" stylename="Ex Hair Italic" filename="../instances/AktivGroteskEx_HairIt.ufo" postscriptfontname="AktivGrotesk-ExHairItalic" stylemapfamilyname="Aktiv Grotesk Ex Hair" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Thin Italic" familyname="Aktiv Grotesk" stylename="Cd Thin Italic" filename="../instances/AktivGroteskCd_ThIt.ufo" postscriptfontname="AktivGrotesk-CdThinItalic" stylemapfamilyname="Aktiv Grotesk Cd Thin" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Thin Italic" familyname="Aktiv Grotesk" stylename="Thin Italic" filename="../instances/AktivGrotesk_ThIt.ufo" postscriptfontname="AktivGrotesk-ThinItalic" stylemapfamilyname="Aktiv Grotesk Thin" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Thin Italic" familyname="Aktiv Grotesk" stylename="Ex Thin Italic" filename="../instances/AktivGroteskEx_ThIt.ufo" postscriptfontname="AktivGrotesk-ExThinItalic" stylemapfamilyname="Aktiv Grotesk Ex Thin" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Light Italic" familyname="Aktiv Grotesk" stylename="Cd Light Italic" filename="../instances/AktivGroteskCd_LtIt.ufo" postscriptfontname="AktivGrotesk-CdLightItalic" stylemapfamilyname="Aktiv Grotesk Cd Light" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Light Italic" familyname="Aktiv Grotesk" stylename="Light Italic" filename="../instances/AktivGrotesk_LtIt.ufo" postscriptfontname="AktivGrotesk-LightItalic" stylemapfamilyname="Aktiv Grotesk Light" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Light Italic" familyname="Aktiv Grotesk" stylename="Ex Light Italic" filename="../instances/AktivGroteskEx_LtIt.ufo" postscriptfontname="AktivGrotesk-ExLightItalic" stylemapfamilyname="Aktiv Grotesk Ex Light" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Italic" familyname="Aktiv Grotesk" stylename="Cd Italic" filename="../instances/AktivGroteskCd_It.ufo" postscriptfontname="AktivGrotesk-CdItalic" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Italic" familyname="Aktiv Grotesk" stylename="Italic" filename="../instances/AktivGrotesk_It.ufo" postscriptfontname="AktivGrotesk-Italic" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Italic" familyname="Aktiv Grotesk" stylename="Ex Italic" filename="../instances/AktivGroteskEx_It.ufo" postscriptfontname="AktivGrotesk-ExItalic" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Medium Italic" familyname="Aktiv Grotesk" stylename="Cd Medium Italic" filename="../instances/AktivGroteskCd_MdIt.ufo" postscriptfontname="AktivGrotesk-CdMediumItalic" stylemapfamilyname="Aktiv Grotesk Cd Medium" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Medium Italic" familyname="Aktiv Grotesk" stylename="Medium Italic" filename="../instances/AktivGrotesk_MdIt.ufo" postscriptfontname="AktivGrotesk-MediumItalic" stylemapfamilyname="Aktiv Grotesk Medium" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Medium Italic" familyname="Aktiv Grotesk" stylename="Ex Medium Italic" filename="../instances/AktivGroteskEx_MdIt.ufo" postscriptfontname="AktivGrotesk-ExMediumItalic" stylemapfamilyname="Aktiv Grotesk Ex Medium" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd SemiBold Italic" familyname="Aktiv Grotesk" stylename="Cd SemiBold Italic" filename="../../build/instances/AktivGroteskCd_SBdIt.ufo" postscriptfontname="AktivGrotesk-CdSemiBoldItalic" stylemapfamilyname="Aktiv Grotesk Cd SemiBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk SemiBold Italic" familyname="Aktiv Grotesk" stylename="SemiBold Italic" filename="../../build/instances/AktivGrotesk_SBdIt.ufo" postscriptfontname="AktivGrotesk-SemiBoldItalic" stylemapfamilyname="Aktiv Grotesk SemiBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex SemiBold Italic" familyname="Aktiv Grotesk" stylename="Ex SemiBold Italic" filename="../../build/instances/AktivGroteskEx_SBdIt.ufo" postscriptfontname="AktivGrotesk-ExSemiBoldItalic" stylemapfamilyname="Aktiv Grotesk Ex SemiBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Bold Italic" familyname="Aktiv Grotesk" stylename="Cd Bold Italic" filename="../instances/AktivGroteskCd_BdIt.ufo" postscriptfontname="AktivGrotesk-CdBoldItalic" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Bold Italic" familyname="Aktiv Grotesk" stylename="Bold Italic" filename="../instances/AktivGrotesk_BdIt.ufo" postscriptfontname="AktivGrotesk-BoldItalic" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Bold Italic" familyname="Aktiv Grotesk" stylename="Ex Bold Italic" filename="../instances/AktivGroteskEx_BdIt.ufo" postscriptfontname="AktivGrotesk-ExBoldItalic" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd XBold Italic" familyname="Aktiv Grotesk" stylename="Cd XBold Italic" filename="../instances/AktivGroteskCd_XBdIt.ufo" postscriptfontname="AktivGrotesk-CdXBoldItalic" stylemapfamilyname="Aktiv Grotesk Cd XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk XBold Italic" familyname="Aktiv Grotesk" stylename="XBold Italic" filename="../instances/AktivGrotesk_XBdIt.ufo" postscriptfontname="AktivGrotesk-XBoldItalic" stylemapfamilyname="Aktiv Grotesk XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex XBold Italic" familyname="Aktiv Grotesk" stylename="Ex XBold Italic" filename="../instances/AktivGroteskEx_XBdIt.ufo" postscriptfontname="AktivGrotesk-ExXBoldItalic" stylemapfamilyname="Aktiv Grotesk Ex XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Black Italic" familyname="Aktiv Grotesk" stylename="Cd Black Italic" filename="../instances/AktivGroteskCd_BlkIt.ufo" postscriptfontname="AktivGrotesk-CdBlackItalic" stylemapfamilyname="Aktiv Grotesk Cd Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Black Italic" familyname="Aktiv Grotesk" stylename="Black Italic" filename="../instances/AktivGrotesk_BlkIt.ufo" postscriptfontname="AktivGrotesk-BlackItalic" stylemapfamilyname="Aktiv Grotesk Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Black Italic" familyname="Aktiv Grotesk" stylename="Ex Black Italic" filename="../instances/AktivGroteskEx_BlkIt.ufo" postscriptfontname="AktivGrotesk-ExBlackItalic" stylemapfamilyname="Aktiv Grotesk Ex Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/convert5to4_output/AktivGroteskVF_Wght.designspace

@@ -0,0 +1,103 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="4.1">
+  <axes>
+    <axis tag="wght" name="Weight" minimum="100" maximum="900" default="400">
+      <map input="100" output="22"/>
+      <map input="200" output="38"/>
+      <map input="300" output="57"/>
+      <map input="400" output="84"/>
+      <map input="500" output="98"/>
+      <map input="600" output="115"/>
+      <map input="700" output="133"/>
+      <map input="800" output="158"/>
+      <map input="900" output="185"/>
+    </axis>
+  </axes>
+  <sources>
+    <source filename="../AktivGrotesk_Hair.ufo" name="Aktiv Grotesk Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" familyname="Aktiv Grotesk">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" layer="{126,100,0}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Blk.ufo" name="Aktiv Grotesk Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="Aktiv Grotesk Hair" familyname="Aktiv Grotesk" stylename="Hair" filename="../instances/AktivGrotesk_Hair.ufo" postscriptfontname="AktivGrotesk-Hair" stylemapfamilyname="Aktiv Grotesk Hair" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Thin" familyname="Aktiv Grotesk" stylename="Thin" filename="../instances/AktivGrotesk_Th.ufo" postscriptfontname="AktivGrotesk-Thin" stylemapfamilyname="Aktiv Grotesk Thin" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Light" familyname="Aktiv Grotesk" stylename="Light" filename="../instances/AktivGrotesk_Lt.ufo" postscriptfontname="AktivGrotesk-Light" stylemapfamilyname="Aktiv Grotesk Light" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk " familyname="Aktiv Grotesk" stylename="" filename="../instances/AktivGrotesk_Rg.ufo" postscriptfontname="AktivGrotesk-" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Medium" familyname="Aktiv Grotesk" stylename="Medium" filename="../instances/AktivGrotesk_Md.ufo" postscriptfontname="AktivGrotesk-Medium" stylemapfamilyname="Aktiv Grotesk Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk SemiBold" familyname="Aktiv Grotesk" stylename="SemiBold" filename="../../build/instances/AktivGrotesk_SBd.ufo" postscriptfontname="AktivGrotesk-SemiBold" stylemapfamilyname="Aktiv Grotesk SemiBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Bold" familyname="Aktiv Grotesk" stylename="Bold" filename="../instances/AktivGrotesk_Bd.ufo" postscriptfontname="AktivGrotesk-Bold" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk XBold" familyname="Aktiv Grotesk" stylename="XBold" filename="../instances/AktivGrotesk_XBd.ufo" postscriptfontname="AktivGrotesk-XBold" stylemapfamilyname="Aktiv Grotesk XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Black" familyname="Aktiv Grotesk" stylename="Black" filename="../instances/AktivGrotesk_Blk.ufo" postscriptfontname="AktivGrotesk-Black" stylemapfamilyname="Aktiv Grotesk Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/convert5to4_output/AktivGroteskVF_WghtWdth.designspace

@@ -0,0 +1,307 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="4.1">
+  <axes>
+    <axis tag="wght" name="Weight" minimum="100" maximum="900" default="400">
+      <map input="100" output="22"/>
+      <map input="200" output="38"/>
+      <map input="300" output="57"/>
+      <map input="400" output="84"/>
+      <map input="500" output="98"/>
+      <map input="600" output="115"/>
+      <map input="700" output="133"/>
+      <map input="800" output="158"/>
+      <map input="900" output="185"/>
+    </axis>
+    <axis tag="wdth" name="Width" minimum="75" maximum="125" default="100"/>
+  </axes>
+  <rules processing="last">
+    <rule name="BRACKET.116.185">
+      <conditionset>
+        <condition name="Weight" minimum="116" maximum="185"/>
+        <condition name="Width" minimum="75" maximum="97.5"/>
+      </conditionset>
+      <sub name="cent" with="cent.BRACKET.130"/>
+      <sub name="dollar" with="dollar.BRACKET.130"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="../AktivGroteskCd_Hair.ufo" name="Aktiv Grotesk Cd Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Hair.ufo" name="Aktiv Grotesk Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_Hair.ufo" name="Aktiv Grotesk Ex Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_Rg.ufo" name="Aktiv Grotesk Cd">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" familyname="Aktiv Grotesk">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" layer="{126,100,0}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_Rg.ufo" name="Aktiv Grotesk Ex">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_Blk.ufo" name="Aktiv Grotesk Cd Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Blk.ufo" name="Aktiv Grotesk Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_Blk.ufo" name="Aktiv Grotesk Ex Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="Aktiv Grotesk Cd Hair" familyname="Aktiv Grotesk" stylename="Cd Hair" filename="../instances/AktivGroteskCd_Hair.ufo" postscriptfontname="AktivGrotesk-CdHair" stylemapfamilyname="Aktiv Grotesk Cd Hair" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Hair" familyname="Aktiv Grotesk" stylename="Hair" filename="../instances/AktivGrotesk_Hair.ufo" postscriptfontname="AktivGrotesk-Hair" stylemapfamilyname="Aktiv Grotesk Hair" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Hair" familyname="Aktiv Grotesk" stylename="Ex Hair" filename="../instances/AktivGroteskEx_Hair.ufo" postscriptfontname="AktivGrotesk-ExHair" stylemapfamilyname="Aktiv Grotesk Ex Hair" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Thin" familyname="Aktiv Grotesk" stylename="Cd Thin" filename="../instances/AktivGroteskCd_Th.ufo" postscriptfontname="AktivGrotesk-CdThin" stylemapfamilyname="Aktiv Grotesk Cd Thin" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Thin" familyname="Aktiv Grotesk" stylename="Thin" filename="../instances/AktivGrotesk_Th.ufo" postscriptfontname="AktivGrotesk-Thin" stylemapfamilyname="Aktiv Grotesk Thin" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Thin" familyname="Aktiv Grotesk" stylename="Ex Thin" filename="../instances/AktivGroteskEx_Th.ufo" postscriptfontname="AktivGrotesk-ExThin" stylemapfamilyname="Aktiv Grotesk Ex Thin" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Light" familyname="Aktiv Grotesk" stylename="Cd Light" filename="../instances/AktivGroteskCd_Lt.ufo" postscriptfontname="AktivGrotesk-CdLight" stylemapfamilyname="Aktiv Grotesk Cd Light" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Light" familyname="Aktiv Grotesk" stylename="Light" filename="../instances/AktivGrotesk_Lt.ufo" postscriptfontname="AktivGrotesk-Light" stylemapfamilyname="Aktiv Grotesk Light" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Light" familyname="Aktiv Grotesk" stylename="Ex Light" filename="../instances/AktivGroteskEx_Lt.ufo" postscriptfontname="AktivGrotesk-ExLight" stylemapfamilyname="Aktiv Grotesk Ex Light" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd" familyname="Aktiv Grotesk" stylename="Cd" filename="../instances/AktivGroteskCd_Rg.ufo" postscriptfontname="AktivGrotesk-Cd" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk " familyname="Aktiv Grotesk" stylename="" filename="../instances/AktivGrotesk_Rg.ufo" postscriptfontname="AktivGrotesk-" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex" familyname="Aktiv Grotesk" stylename="Ex" filename="../instances/AktivGroteskEx_Rg.ufo" postscriptfontname="AktivGrotesk-Ex" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Medium" familyname="Aktiv Grotesk" stylename="Cd Medium" filename="../instances/AktivGroteskCd_Md.ufo" postscriptfontname="AktivGrotesk-CdMedium" stylemapfamilyname="Aktiv Grotesk Cd Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Medium" familyname="Aktiv Grotesk" stylename="Medium" filename="../instances/AktivGrotesk_Md.ufo" postscriptfontname="AktivGrotesk-Medium" stylemapfamilyname="Aktiv Grotesk Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Medium" familyname="Aktiv Grotesk" stylename="Ex Medium" filename="../instances/AktivGroteskEx_Md.ufo" postscriptfontname="AktivGrotesk-ExMedium" stylemapfamilyname="Aktiv Grotesk Ex Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd SemiBold" familyname="Aktiv Grotesk" stylename="Cd SemiBold" filename="../../build/instances/AktivGroteskCd_SBd.ufo" postscriptfontname="AktivGrotesk-CdSemiBold" stylemapfamilyname="Aktiv Grotesk Cd SemiBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk SemiBold" familyname="Aktiv Grotesk" stylename="SemiBold" filename="../../build/instances/AktivGrotesk_SBd.ufo" postscriptfontname="AktivGrotesk-SemiBold" stylemapfamilyname="Aktiv Grotesk SemiBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex SemiBold" familyname="Aktiv Grotesk" stylename="Ex SemiBold" filename="../../build/instances/AktivGroteskEx_SBd.ufo" postscriptfontname="AktivGrotesk-ExSemiBold" stylemapfamilyname="Aktiv Grotesk Ex SemiBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Bold" familyname="Aktiv Grotesk" stylename="Cd Bold" filename="../instances/AktivGroteskCd_Bd.ufo" postscriptfontname="AktivGrotesk-CdBold" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Bold" familyname="Aktiv Grotesk" stylename="Bold" filename="../instances/AktivGrotesk_Bd.ufo" postscriptfontname="AktivGrotesk-Bold" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Bold" familyname="Aktiv Grotesk" stylename="Ex Bold" filename="../instances/AktivGroteskEx_Bd.ufo" postscriptfontname="AktivGrotesk-ExBold" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd XBold" familyname="Aktiv Grotesk" stylename="Cd XBold" filename="../instances/AktivGroteskCd_XBd.ufo" postscriptfontname="AktivGrotesk-CdXBold" stylemapfamilyname="Aktiv Grotesk Cd XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk XBold" familyname="Aktiv Grotesk" stylename="XBold" filename="../instances/AktivGrotesk_XBd.ufo" postscriptfontname="AktivGrotesk-XBold" stylemapfamilyname="Aktiv Grotesk XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex XBold" familyname="Aktiv Grotesk" stylename="Ex XBold" filename="../instances/AktivGroteskEx_XBd.ufo" postscriptfontname="AktivGrotesk-ExXBold" stylemapfamilyname="Aktiv Grotesk Ex XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Black" familyname="Aktiv Grotesk" stylename="Cd Black" filename="../instances/AktivGroteskCd_Blk.ufo" postscriptfontname="AktivGrotesk-CdBlack" stylemapfamilyname="Aktiv Grotesk Cd Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Black" familyname="Aktiv Grotesk" stylename="Black" filename="../instances/AktivGrotesk_Blk.ufo" postscriptfontname="AktivGrotesk-Black" stylemapfamilyname="Aktiv Grotesk Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Black" familyname="Aktiv Grotesk" stylename="Ex Black" filename="../instances/AktivGroteskEx_Blk.ufo" postscriptfontname="AktivGrotesk-ExBlack" stylemapfamilyname="Aktiv Grotesk Ex Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/convert5to4_output/AktivGroteskVF_WghtWdthItal.designspace

@@ -0,0 +1,670 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="4.1">
+  <axes>
+    <axis tag="wght" name="Weight" minimum="100" maximum="900" default="400">
+      <map input="100" output="22"/>
+      <map input="200" output="38"/>
+      <map input="300" output="57"/>
+      <map input="400" output="84"/>
+      <map input="500" output="98"/>
+      <map input="600" output="115"/>
+      <map input="700" output="133"/>
+      <map input="800" output="158"/>
+      <map input="900" output="185"/>
+    </axis>
+    <axis tag="wdth" name="Width" minimum="75" maximum="125" default="100"/>
+    <axis tag="ital" name="Italic" minimum="0" maximum="1" default="0"/>
+  </axes>
+  <rules processing="last">
+    <rule name="BRACKET.CYR">
+      <conditionset>
+        <condition name="Italic" minimum="0.1" maximum="1"/>
+      </conditionset>
+      <sub name="ghe.loclSRB" with="ghe.ital.loclSRB"/>
+      <sub name="ghe.loclMKD" with="ghe.ital.loclMKD"/>
+      <sub name="de.loclMKDSRB" with="de.ital.loclMKDSRB"/>
+      <sub name="pe.loclMKDSRB" with="pe.ital.loclMKDSRB"/>
+      <sub name="te.loclMKDSRB" with="te.ital.loclMKDSRB"/>
+      <sub name="gje.loclMKD" with="gje.ital.loclMKD"/>
+      <sub name="sha.loclMKDSRB" with="sha.ital.loclMKDSRB"/>
+    </rule>
+    <rule name="BRACKET.116.185">
+      <conditionset>
+        <condition name="Weight" minimum="116" maximum="185"/>
+        <condition name="Width" minimum="75" maximum="97.5"/>
+      </conditionset>
+      <sub name="cent" with="cent.BRACKET.130"/>
+      <sub name="dollar" with="dollar.BRACKET.130"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="../AktivGroteskCd_Hair.ufo" name="Aktiv Grotesk Cd Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_HairIt.ufo" name="Aktiv Grotesk Cd Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Hair.ufo" name="Aktiv Grotesk Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_HairIt.ufo" name="Aktiv Grotesk Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_Hair.ufo" name="Aktiv Grotesk Ex Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_HairIt.ufo" name="Aktiv Grotesk Ex Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_Rg.ufo" name="Aktiv Grotesk Cd">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_It.ufo" name="Aktiv Grotesk Cd Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" familyname="Aktiv Grotesk">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" layer="{126,100,0}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic {126,100,1}" layer="{126,100,1}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_Rg.ufo" name="Aktiv Grotesk Ex">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_It.ufo" name="Aktiv Grotesk Ex Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_Blk.ufo" name="Aktiv Grotesk Cd Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_BlkIt.ufo" name="Aktiv Grotesk Cd Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Blk.ufo" name="Aktiv Grotesk Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_BlkIt.ufo" name="Aktiv Grotesk Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_Blk.ufo" name="Aktiv Grotesk Ex Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_BlkIt.ufo" name="Aktiv Grotesk Ex Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="Aktiv Grotesk Cd Hair" familyname="Aktiv Grotesk" stylename="Cd Hair" filename="../instances/AktivGroteskCd_Hair.ufo" postscriptfontname="AktivGrotesk-CdHair" stylemapfamilyname="Aktiv Grotesk Cd Hair" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Hair Italic" familyname="Aktiv Grotesk" stylename="Cd Hair Italic" filename="../instances/AktivGroteskCd_HairIt.ufo" postscriptfontname="AktivGrotesk-CdHairItalic" stylemapfamilyname="Aktiv Grotesk Cd Hair" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Hair" familyname="Aktiv Grotesk" stylename="Hair" filename="../instances/AktivGrotesk_Hair.ufo" postscriptfontname="AktivGrotesk-Hair" stylemapfamilyname="Aktiv Grotesk Hair" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Hair Italic" familyname="Aktiv Grotesk" stylename="Hair Italic" filename="../instances/AktivGrotesk_HairIt.ufo" postscriptfontname="AktivGrotesk-HairItalic" stylemapfamilyname="Aktiv Grotesk Hair" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Hair" familyname="Aktiv Grotesk" stylename="Ex Hair" filename="../instances/AktivGroteskEx_Hair.ufo" postscriptfontname="AktivGrotesk-ExHair" stylemapfamilyname="Aktiv Grotesk Ex Hair" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Hair Italic" familyname="Aktiv Grotesk" stylename="Ex Hair Italic" filename="../instances/AktivGroteskEx_HairIt.ufo" postscriptfontname="AktivGrotesk-ExHairItalic" stylemapfamilyname="Aktiv Grotesk Ex Hair" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Thin" familyname="Aktiv Grotesk" stylename="Cd Thin" filename="../instances/AktivGroteskCd_Th.ufo" postscriptfontname="AktivGrotesk-CdThin" stylemapfamilyname="Aktiv Grotesk Cd Thin" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Thin Italic" familyname="Aktiv Grotesk" stylename="Cd Thin Italic" filename="../instances/AktivGroteskCd_ThIt.ufo" postscriptfontname="AktivGrotesk-CdThinItalic" stylemapfamilyname="Aktiv Grotesk Cd Thin" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Thin" familyname="Aktiv Grotesk" stylename="Thin" filename="../instances/AktivGrotesk_Th.ufo" postscriptfontname="AktivGrotesk-Thin" stylemapfamilyname="Aktiv Grotesk Thin" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Thin Italic" familyname="Aktiv Grotesk" stylename="Thin Italic" filename="../instances/AktivGrotesk_ThIt.ufo" postscriptfontname="AktivGrotesk-ThinItalic" stylemapfamilyname="Aktiv Grotesk Thin" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Thin" familyname="Aktiv Grotesk" stylename="Ex Thin" filename="../instances/AktivGroteskEx_Th.ufo" postscriptfontname="AktivGrotesk-ExThin" stylemapfamilyname="Aktiv Grotesk Ex Thin" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Thin Italic" familyname="Aktiv Grotesk" stylename="Ex Thin Italic" filename="../instances/AktivGroteskEx_ThIt.ufo" postscriptfontname="AktivGrotesk-ExThinItalic" stylemapfamilyname="Aktiv Grotesk Ex Thin" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Light" familyname="Aktiv Grotesk" stylename="Cd Light" filename="../instances/AktivGroteskCd_Lt.ufo" postscriptfontname="AktivGrotesk-CdLight" stylemapfamilyname="Aktiv Grotesk Cd Light" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Light Italic" familyname="Aktiv Grotesk" stylename="Cd Light Italic" filename="../instances/AktivGroteskCd_LtIt.ufo" postscriptfontname="AktivGrotesk-CdLightItalic" stylemapfamilyname="Aktiv Grotesk Cd Light" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Light" familyname="Aktiv Grotesk" stylename="Light" filename="../instances/AktivGrotesk_Lt.ufo" postscriptfontname="AktivGrotesk-Light" stylemapfamilyname="Aktiv Grotesk Light" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Light Italic" familyname="Aktiv Grotesk" stylename="Light Italic" filename="../instances/AktivGrotesk_LtIt.ufo" postscriptfontname="AktivGrotesk-LightItalic" stylemapfamilyname="Aktiv Grotesk Light" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Light" familyname="Aktiv Grotesk" stylename="Ex Light" filename="../instances/AktivGroteskEx_Lt.ufo" postscriptfontname="AktivGrotesk-ExLight" stylemapfamilyname="Aktiv Grotesk Ex Light" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Light Italic" familyname="Aktiv Grotesk" stylename="Ex Light Italic" filename="../instances/AktivGroteskEx_LtIt.ufo" postscriptfontname="AktivGrotesk-ExLightItalic" stylemapfamilyname="Aktiv Grotesk Ex Light" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd" familyname="Aktiv Grotesk" stylename="Cd" filename="../instances/AktivGroteskCd_Rg.ufo" postscriptfontname="AktivGrotesk-Cd" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Italic" familyname="Aktiv Grotesk" stylename="Cd Italic" filename="../instances/AktivGroteskCd_It.ufo" postscriptfontname="AktivGrotesk-CdItalic" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk " familyname="Aktiv Grotesk" stylename="" filename="../instances/AktivGrotesk_Rg.ufo" postscriptfontname="AktivGrotesk-" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Italic" familyname="Aktiv Grotesk" stylename="Italic" filename="../instances/AktivGrotesk_It.ufo" postscriptfontname="AktivGrotesk-Italic" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex" familyname="Aktiv Grotesk" stylename="Ex" filename="../instances/AktivGroteskEx_Rg.ufo" postscriptfontname="AktivGrotesk-Ex" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Italic" familyname="Aktiv Grotesk" stylename="Ex Italic" filename="../instances/AktivGroteskEx_It.ufo" postscriptfontname="AktivGrotesk-ExItalic" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Medium" familyname="Aktiv Grotesk" stylename="Cd Medium" filename="../instances/AktivGroteskCd_Md.ufo" postscriptfontname="AktivGrotesk-CdMedium" stylemapfamilyname="Aktiv Grotesk Cd Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Medium Italic" familyname="Aktiv Grotesk" stylename="Cd Medium Italic" filename="../instances/AktivGroteskCd_MdIt.ufo" postscriptfontname="AktivGrotesk-CdMediumItalic" stylemapfamilyname="Aktiv Grotesk Cd Medium" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Medium" familyname="Aktiv Grotesk" stylename="Medium" filename="../instances/AktivGrotesk_Md.ufo" postscriptfontname="AktivGrotesk-Medium" stylemapfamilyname="Aktiv Grotesk Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Medium Italic" familyname="Aktiv Grotesk" stylename="Medium Italic" filename="../instances/AktivGrotesk_MdIt.ufo" postscriptfontname="AktivGrotesk-MediumItalic" stylemapfamilyname="Aktiv Grotesk Medium" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Medium" familyname="Aktiv Grotesk" stylename="Ex Medium" filename="../instances/AktivGroteskEx_Md.ufo" postscriptfontname="AktivGrotesk-ExMedium" stylemapfamilyname="Aktiv Grotesk Ex Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Medium Italic" familyname="Aktiv Grotesk" stylename="Ex Medium Italic" filename="../instances/AktivGroteskEx_MdIt.ufo" postscriptfontname="AktivGrotesk-ExMediumItalic" stylemapfamilyname="Aktiv Grotesk Ex Medium" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd SemiBold" familyname="Aktiv Grotesk" stylename="Cd SemiBold" filename="../../build/instances/AktivGroteskCd_SBd.ufo" postscriptfontname="AktivGrotesk-CdSemiBold" stylemapfamilyname="Aktiv Grotesk Cd SemiBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd SemiBold Italic" familyname="Aktiv Grotesk" stylename="Cd SemiBold Italic" filename="../../build/instances/AktivGroteskCd_SBdIt.ufo" postscriptfontname="AktivGrotesk-CdSemiBoldItalic" stylemapfamilyname="Aktiv Grotesk Cd SemiBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk SemiBold" familyname="Aktiv Grotesk" stylename="SemiBold" filename="../../build/instances/AktivGrotesk_SBd.ufo" postscriptfontname="AktivGrotesk-SemiBold" stylemapfamilyname="Aktiv Grotesk SemiBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk SemiBold Italic" familyname="Aktiv Grotesk" stylename="SemiBold Italic" filename="../../build/instances/AktivGrotesk_SBdIt.ufo" postscriptfontname="AktivGrotesk-SemiBoldItalic" stylemapfamilyname="Aktiv Grotesk SemiBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex SemiBold" familyname="Aktiv Grotesk" stylename="Ex SemiBold" filename="../../build/instances/AktivGroteskEx_SBd.ufo" postscriptfontname="AktivGrotesk-ExSemiBold" stylemapfamilyname="Aktiv Grotesk Ex SemiBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex SemiBold Italic" familyname="Aktiv Grotesk" stylename="Ex SemiBold Italic" filename="../../build/instances/AktivGroteskEx_SBdIt.ufo" postscriptfontname="AktivGrotesk-ExSemiBoldItalic" stylemapfamilyname="Aktiv Grotesk Ex SemiBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Bold" familyname="Aktiv Grotesk" stylename="Cd Bold" filename="../instances/AktivGroteskCd_Bd.ufo" postscriptfontname="AktivGrotesk-CdBold" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Bold Italic" familyname="Aktiv Grotesk" stylename="Cd Bold Italic" filename="../instances/AktivGroteskCd_BdIt.ufo" postscriptfontname="AktivGrotesk-CdBoldItalic" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Bold" familyname="Aktiv Grotesk" stylename="Bold" filename="../instances/AktivGrotesk_Bd.ufo" postscriptfontname="AktivGrotesk-Bold" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Bold Italic" familyname="Aktiv Grotesk" stylename="Bold Italic" filename="../instances/AktivGrotesk_BdIt.ufo" postscriptfontname="AktivGrotesk-BoldItalic" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Bold" familyname="Aktiv Grotesk" stylename="Ex Bold" filename="../instances/AktivGroteskEx_Bd.ufo" postscriptfontname="AktivGrotesk-ExBold" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Bold Italic" familyname="Aktiv Grotesk" stylename="Ex Bold Italic" filename="../instances/AktivGroteskEx_BdIt.ufo" postscriptfontname="AktivGrotesk-ExBoldItalic" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd XBold" familyname="Aktiv Grotesk" stylename="Cd XBold" filename="../instances/AktivGroteskCd_XBd.ufo" postscriptfontname="AktivGrotesk-CdXBold" stylemapfamilyname="Aktiv Grotesk Cd XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd XBold Italic" familyname="Aktiv Grotesk" stylename="Cd XBold Italic" filename="../instances/AktivGroteskCd_XBdIt.ufo" postscriptfontname="AktivGrotesk-CdXBoldItalic" stylemapfamilyname="Aktiv Grotesk Cd XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk XBold" familyname="Aktiv Grotesk" stylename="XBold" filename="../instances/AktivGrotesk_XBd.ufo" postscriptfontname="AktivGrotesk-XBold" stylemapfamilyname="Aktiv Grotesk XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk XBold Italic" familyname="Aktiv Grotesk" stylename="XBold Italic" filename="../instances/AktivGrotesk_XBdIt.ufo" postscriptfontname="AktivGrotesk-XBoldItalic" stylemapfamilyname="Aktiv Grotesk XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex XBold" familyname="Aktiv Grotesk" stylename="Ex XBold" filename="../instances/AktivGroteskEx_XBd.ufo" postscriptfontname="AktivGrotesk-ExXBold" stylemapfamilyname="Aktiv Grotesk Ex XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex XBold Italic" familyname="Aktiv Grotesk" stylename="Ex XBold Italic" filename="../instances/AktivGroteskEx_XBdIt.ufo" postscriptfontname="AktivGrotesk-ExXBoldItalic" stylemapfamilyname="Aktiv Grotesk Ex XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Black" familyname="Aktiv Grotesk" stylename="Cd Black" filename="../instances/AktivGroteskCd_Blk.ufo" postscriptfontname="AktivGrotesk-CdBlack" stylemapfamilyname="Aktiv Grotesk Cd Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Black Italic" familyname="Aktiv Grotesk" stylename="Cd Black Italic" filename="../instances/AktivGroteskCd_BlkIt.ufo" postscriptfontname="AktivGrotesk-CdBlackItalic" stylemapfamilyname="Aktiv Grotesk Cd Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Black" familyname="Aktiv Grotesk" stylename="Black" filename="../instances/AktivGrotesk_Blk.ufo" postscriptfontname="AktivGrotesk-Black" stylemapfamilyname="Aktiv Grotesk Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Black Italic" familyname="Aktiv Grotesk" stylename="Black Italic" filename="../instances/AktivGrotesk_BlkIt.ufo" postscriptfontname="AktivGrotesk-BlackItalic" stylemapfamilyname="Aktiv Grotesk Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Black" familyname="Aktiv Grotesk" stylename="Ex Black" filename="../instances/AktivGroteskEx_Blk.ufo" postscriptfontname="AktivGrotesk-ExBlack" stylemapfamilyname="Aktiv Grotesk Ex Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Black Italic" familyname="Aktiv Grotesk" stylename="Ex Black Italic" filename="../instances/AktivGroteskEx_BlkIt.ufo" postscriptfontname="AktivGrotesk-ExBlackItalic" stylemapfamilyname="Aktiv Grotesk Ex Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/convert5to4_output/SourceSerif4Variable-Italic.designspace

@@ -0,0 +1,326 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="4.1">
+  <axes>
+    <axis tag="wght" name="weight" minimum="200" maximum="900" default="400">
+      <map input="200" output="0"/>
+      <map input="300" output="145"/>
+      <map input="400" output="394"/>
+      <map input="600" output="594"/>
+      <map input="700" output="823"/>
+      <map input="900" output="1000"/>
+    </axis>
+    <axis tag="opsz" name="optical" minimum="8" maximum="60" default="20"/>
+  </axes>
+  <sources>
+    <source filename="../caption/master_0/SourceSerif-Italic_c0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../caption/master_1/SourceSerif-Italic_c1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../caption/master_2/SourceSerif-Italic_c2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../text/master_0/SourceSerif-Italic_0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../text/master_1/SourceSerif-Italic_1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../text/master_2/SourceSerif-Italic_2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../display/master_0/SourceSerif-Italic_d0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+    <source filename="../display/master_1/SourceSerif-Italic_d1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+    <source filename="../display/master_2/SourceSerif-Italic_d2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="Source Serif 4 Caption ExtraLight Italic" familyname="Source Serif 4" stylename="Caption ExtraLight Italic" filename="Source Serif 4-Caption ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionExtraLight" stylemapfamilyname="Source Serif 4 Caption ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Caption Light Italic" familyname="Source Serif 4" stylename="Caption Light Italic" filename="Source Serif 4-Caption Light Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionLight" stylemapfamilyname="Source Serif 4 Caption Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Caption Italic" familyname="Source Serif 4" stylename="Caption Italic" filename="Source Serif 4-Caption Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionRegular" stylemapfamilyname="Source Serif 4 Caption Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Caption Semibold Italic" familyname="Source Serif 4" stylename="Caption Semibold Italic" filename="Source Serif 4-Caption Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionSemibold" stylemapfamilyname="Source Serif 4 Caption Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Caption Bold Italic" familyname="Source Serif 4" stylename="Caption Bold Italic" filename="Source Serif 4-Caption Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionBold" stylemapfamilyname="Source Serif 4 Caption Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Caption Black Italic" familyname="Source Serif 4" stylename="Caption Black Italic" filename="Source Serif 4-Caption Black Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionBlack" stylemapfamilyname="Source Serif 4 Caption Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 SmText ExtraLight Italic" familyname="Source Serif 4" stylename="SmText ExtraLight Italic" filename="Source Serif 4-SmText ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextExtraLight" stylemapfamilyname="Source Serif 4 SmallText ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 SmText Light Italic" familyname="Source Serif 4" stylename="SmText Light Italic" filename="Source Serif 4-SmText Light Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextLight" stylemapfamilyname="Source Serif 4 SmallText Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 SmText Italic" familyname="Source Serif 4" stylename="SmText Italic" filename="Source Serif 4-SmText Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextRegular" stylemapfamilyname="Source Serif 4 SmallText Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 SmText Semibold Italic" familyname="Source Serif 4" stylename="SmText Semibold Italic" filename="Source Serif 4-SmText Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextSemibold" stylemapfamilyname="Source Serif 4 SmallText Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 SmText Bold Italic" familyname="Source Serif 4" stylename="SmText Bold Italic" filename="Source Serif 4-SmText Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextBold" stylemapfamilyname="Source Serif 4 SmallText Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 SmText Black Italic" familyname="Source Serif 4" stylename="SmText Black Italic" filename="Source Serif 4-SmText Black Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextBlack" stylemapfamilyname="Source Serif 4 SmallText Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 ExtraLight Italic" familyname="Source Serif 4" stylename="ExtraLight Italic" filename="Source Serif 4-ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-ExtraLight" stylemapfamilyname="Source Serif 4 ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Light Italic" familyname="Source Serif 4" stylename="Light Italic" filename="Source Serif 4-Light Italic.ttf" postscriptfontname="SourceSerif4Italic-Light" stylemapfamilyname="Source Serif 4 Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Italic" familyname="Source Serif 4" stylename="Italic" filename="Source Serif 4-Italic.ttf" postscriptfontname="SourceSerif4Italic-Regular" stylemapfamilyname="Source Serif 4 Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Semibold Italic" familyname="Source Serif 4" stylename="Semibold Italic" filename="Source Serif 4-Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-Semibold" stylemapfamilyname="Source Serif 4 Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Bold Italic" familyname="Source Serif 4" stylename="Bold Italic" filename="Source Serif 4-Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-Bold" stylemapfamilyname="Source Serif 4 Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Black Italic" familyname="Source Serif 4" stylename="Black Italic" filename="Source Serif 4-Black Italic.ttf" postscriptfontname="SourceSerif4Italic-Black" stylemapfamilyname="Source Serif 4 Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Subhead ExtraLight Italic" familyname="Source Serif 4" stylename="Subhead ExtraLight Italic" filename="Source Serif 4-Subhead ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadExtraLight" stylemapfamilyname="Source Serif 4 Subhead ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Subhead Light Italic" familyname="Source Serif 4" stylename="Subhead Light Italic" filename="Source Serif 4-Subhead Light Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadLight" stylemapfamilyname="Source Serif 4 Subhead Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Subhead Italic" familyname="Source Serif 4" stylename="Subhead Italic" filename="Source Serif 4-Subhead Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadRegular" stylemapfamilyname="Source Serif 4 Subhead Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Subhead Semibold Italic" familyname="Source Serif 4" stylename="Subhead Semibold Italic" filename="Source Serif 4-Subhead Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadSemibold" stylemapfamilyname="Source Serif 4 Subhead Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Subhead Bold Italic" familyname="Source Serif 4" stylename="Subhead Bold Italic" filename="Source Serif 4-Subhead Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadBold" stylemapfamilyname="Source Serif 4 Subhead Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Subhead Black Italic" familyname="Source Serif 4" stylename="Subhead Black Italic" filename="Source Serif 4-Subhead Black Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadBlack" stylemapfamilyname="Source Serif 4 Subhead Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Display ExtraLight Italic" familyname="Source Serif 4" stylename="Display ExtraLight Italic" filename="Source Serif 4-Display ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayExtraLight" stylemapfamilyname="Source Serif 4 Display ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Display Light Italic" familyname="Source Serif 4" stylename="Display Light Italic" filename="Source Serif 4-Display Light Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayLight" stylemapfamilyname="Source Serif 4 Display Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Display Italic" familyname="Source Serif 4" stylename="Display Italic" filename="Source Serif 4-Display Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayRegular" stylemapfamilyname="Source Serif 4 Display Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Display Semibold Italic" familyname="Source Serif 4" stylename="Display Semibold Italic" filename="Source Serif 4-Display Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplaySemibold" stylemapfamilyname="Source Serif 4 Display Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Display Bold Italic" familyname="Source Serif 4" stylename="Display Bold Italic" filename="Source Serif 4-Display Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayBold" stylemapfamilyname="Source Serif 4 Display Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Display Black Italic" familyname="Source Serif 4" stylename="Display Black Italic" filename="Source Serif 4-Display Black Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayBlack" stylemapfamilyname="Source Serif 4 Display Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+  </instances>
+  <lib>
+    <dict>
+      <key>public.skipExportGlyphs</key>
+      <array>
+        <string>caron.alt</string>
+        <string>commabelowcmb.alt</string>
+        <string>f.liga</string>
+        <string>f.ligalong</string>
+        <string>tonos.cap</string>
+        <string>dieresiscmb.tight</string>
+        <string>turkicdsccmb</string>
+      </array>
+    </dict>
+  </lib>
+</designspace>

Tests/designspaceLib/data/convert5to4_output/SourceSerif4Variable-Roman.designspace

@@ -0,0 +1,334 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="4.1">
+  <axes>
+    <axis tag="wght" name="weight" minimum="200" maximum="900" default="400">
+      <map input="200" output="0"/>
+      <map input="300" output="145"/>
+      <map input="400" output="394"/>
+      <map input="600" output="594"/>
+      <map input="700" output="823"/>
+      <map input="900" output="1000"/>
+    </axis>
+    <axis tag="opsz" name="optical" minimum="8" maximum="60" default="20"/>
+  </axes>
+  <sources>
+    <source filename="../caption/master_0/SourceSerif_c0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../caption/master_1/SourceSerif_c1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../caption/master_2/SourceSerif_c2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../text/master_0/SourceSerif_0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../text/master_1/SourceSerif_1.ufo" familyname="Source Serif 4">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../text/master_2/SourceSerif_2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../display/master_0/SourceSerif_d0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+    <source filename="../display/master_1/SourceSerif_d1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+    <source filename="../display/master_2/SourceSerif_d2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="Source Serif 4 Caption ExtraLight" familyname="Source Serif 4" stylename="Caption ExtraLight" filename="Source Serif 4-Caption ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-CaptionExtraLight" stylemapfamilyname="Source Serif 4 Caption ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Caption Light" familyname="Source Serif 4" stylename="Caption Light" filename="Source Serif 4-Caption Light.ttf" postscriptfontname="SourceSerif4Roman-CaptionLight" stylemapfamilyname="Source Serif 4 Caption Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Caption" familyname="Source Serif 4" stylename="Caption" filename="Source Serif 4-Caption.ttf" postscriptfontname="SourceSerif4Roman-CaptionRegular" stylemapfamilyname="Source Serif 4 Caption" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Caption Semibold" familyname="Source Serif 4" stylename="Caption Semibold" filename="Source Serif 4-Caption Semibold.ttf" postscriptfontname="SourceSerif4Roman-CaptionSemibold" stylemapfamilyname="Source Serif 4 Caption Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Caption Bold" familyname="Source Serif 4" stylename="Caption Bold" filename="Source Serif 4-Caption Bold.ttf" postscriptfontname="SourceSerif4Roman-CaptionBold" stylemapfamilyname="Source Serif 4 Caption Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Caption Black" familyname="Source Serif 4" stylename="Caption Black" filename="Source Serif 4-Caption Black.ttf" postscriptfontname="SourceSerif4Roman-CaptionBlack" stylemapfamilyname="Source Serif 4 Caption Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 SmText ExtraLight" familyname="Source Serif 4" stylename="SmText ExtraLight" filename="Source Serif 4-SmText ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-SmTextExtraLight" stylemapfamilyname="Source Serif 4 SmallText ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 SmText Light" familyname="Source Serif 4" stylename="SmText Light" filename="Source Serif 4-SmText Light.ttf" postscriptfontname="SourceSerif4Roman-SmTextLight" stylemapfamilyname="Source Serif 4 SmallText Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 SmText" familyname="Source Serif 4" stylename="SmText" filename="Source Serif 4-SmText.ttf" postscriptfontname="SourceSerif4Roman-SmTextRegular" stylemapfamilyname="Source Serif 4 SmallText" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 SmText Semibold" familyname="Source Serif 4" stylename="SmText Semibold" filename="Source Serif 4-SmText Semibold.ttf" postscriptfontname="SourceSerif4Roman-SmTextSemibold" stylemapfamilyname="Source Serif 4 SmallText Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 SmText Bold" familyname="Source Serif 4" stylename="SmText Bold" filename="Source Serif 4-SmText Bold.ttf" postscriptfontname="SourceSerif4Roman-SmTextBold" stylemapfamilyname="Source Serif 4 SmallText Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 SmText Black" familyname="Source Serif 4" stylename="SmText Black" filename="Source Serif 4-SmText Black.ttf" postscriptfontname="SourceSerif4Roman-SmTextBlack" stylemapfamilyname="Source Serif 4 SmallText Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 ExtraLight" familyname="Source Serif 4" stylename="ExtraLight" filename="Source Serif 4-ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-ExtraLight" stylemapfamilyname="Source Serif 4 ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Light" familyname="Source Serif 4" stylename="Light" filename="Source Serif 4-Light.ttf" postscriptfontname="SourceSerif4Roman-Light" stylemapfamilyname="Source Serif 4 Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Regular" familyname="Source Serif 4" stylename="Regular" filename="Source Serif 4-Regular.ttf" postscriptfontname="SourceSerif4Roman-Regular" stylemapfamilyname="Source Serif 4" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Semibold" familyname="Source Serif 4" stylename="Semibold" filename="Source Serif 4-Semibold.ttf" postscriptfontname="SourceSerif4Roman-Semibold" stylemapfamilyname="Source Serif 4 Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Bold" familyname="Source Serif 4" stylename="Bold" filename="Source Serif 4-Bold.ttf" postscriptfontname="SourceSerif4Roman-Bold" stylemapfamilyname="Source Serif 4 Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Black" familyname="Source Serif 4" stylename="Black" filename="Source Serif 4-Black.ttf" postscriptfontname="SourceSerif4Roman-Black" stylemapfamilyname="Source Serif 4 Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Subhead ExtraLight" familyname="Source Serif 4" stylename="Subhead ExtraLight" filename="Source Serif 4-Subhead ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-SubheadExtraLight" stylemapfamilyname="Source Serif 4 Subhead ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Subhead Light" familyname="Source Serif 4" stylename="Subhead Light" filename="Source Serif 4-Subhead Light.ttf" postscriptfontname="SourceSerif4Roman-SubheadLight" stylemapfamilyname="Source Serif 4 Subhead Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Subhead" familyname="Source Serif 4" stylename="Subhead" filename="Source Serif 4-Subhead.ttf" postscriptfontname="SourceSerif4Roman-SubheadRegular" stylemapfamilyname="Source Serif 4 Subhead" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Subhead Semibold" familyname="Source Serif 4" stylename="Subhead Semibold" filename="Source Serif 4-Subhead Semibold.ttf" postscriptfontname="SourceSerif4Roman-SubheadSemibold" stylemapfamilyname="Source Serif 4 Subhead Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Subhead Bold" familyname="Source Serif 4" stylename="Subhead Bold" filename="Source Serif 4-Subhead Bold.ttf" postscriptfontname="SourceSerif4Roman-SubheadBold" stylemapfamilyname="Source Serif 4 Subhead Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Subhead Black" familyname="Source Serif 4" stylename="Subhead Black" filename="Source Serif 4-Subhead Black.ttf" postscriptfontname="SourceSerif4Roman-SubheadBlack" stylemapfamilyname="Source Serif 4 Subhead Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Display ExtraLight" familyname="Source Serif 4" stylename="Display ExtraLight" filename="Source Serif 4-Display ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-DisplayExtraLight" stylemapfamilyname="Source Serif 4 Display ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Display Light" familyname="Source Serif 4" stylename="Display Light" filename="Source Serif 4-Display Light.ttf" postscriptfontname="SourceSerif4Roman-DisplayLight" stylemapfamilyname="Source Serif 4 Display Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Display" familyname="Source Serif 4" stylename="Display" filename="Source Serif 4-Display.ttf" postscriptfontname="SourceSerif4Roman-DisplayRegular" stylemapfamilyname="Source Serif 4 Display" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Display Semibold" familyname="Source Serif 4" stylename="Display Semibold" filename="Source Serif 4-Display Semibold.ttf" postscriptfontname="SourceSerif4Roman-DisplaySemibold" stylemapfamilyname="Source Serif 4 Display Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Display Bold" familyname="Source Serif 4" stylename="Display Bold" filename="Source Serif 4-Display Bold.ttf" postscriptfontname="SourceSerif4Roman-DisplayBold" stylemapfamilyname="Source Serif 4 Display Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+    <instance name="Source Serif 4 Display Black" familyname="Source Serif 4" stylename="Display Black" filename="Source Serif 4-Display Black.ttf" postscriptfontname="SourceSerif4Roman-DisplayBlack" stylemapfamilyname="Source Serif 4 Display Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+      <kerning/>
+      <info/>
+    </instance>
+  </instances>
+  <lib>
+    <dict>
+      <key>public.skipExportGlyphs</key>
+      <array>
+        <string>caron.alt</string>
+        <string>commabelowcmb.alt</string>
+        <string>tonos.cap</string>
+        <string>f.ligalong</string>
+        <string>dieresiscmb.tight</string>
+        <string>IJ</string>
+        <string>Tbar</string>
+        <string>colontriangularmod</string>
+        <string>crossmark</string>
+        <string>ij</string>
+        <string>overline</string>
+        <string>similar</string>
+        <string>tbar</string>
+        <string>triangularbullet</string>
+        <string>turkicdsccmb</string>
+      </array>
+    </dict>
+  </lib>
+</designspace>

Tests/designspaceLib/data/split_output/AktivGroteskVF_Italics_Wght.designspace

@@ -0,0 +1,96 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="Weight" minimum="100" maximum="900" default="400">
+      <map input="100" output="22"/>
+      <map input="200" output="38"/>
+      <map input="300" output="57"/>
+      <map input="400" output="84"/>
+      <map input="500" output="98"/>
+      <map input="600" output="115"/>
+      <map input="700" output="133"/>
+      <map input="800" output="158"/>
+      <map input="900" output="185"/>
+    </axis>
+  </axes>
+  <rules processing="last">
+    <rule name="BRACKET.CYR">
+      <sub name="ghe.loclSRB" with="ghe.ital.loclSRB"/>
+      <sub name="ghe.loclMKD" with="ghe.ital.loclMKD"/>
+      <sub name="de.loclMKDSRB" with="de.ital.loclMKDSRB"/>
+      <sub name="pe.loclMKDSRB" with="pe.ital.loclMKDSRB"/>
+      <sub name="te.loclMKDSRB" with="te.ital.loclMKDSRB"/>
+      <sub name="gje.loclMKD" with="gje.ital.loclMKD"/>
+      <sub name="sha.loclMKDSRB" with="sha.ital.loclMKDSRB"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="../AktivGrotesk_HairIt.ufo" name="Aktiv Grotesk Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic {126,100,1}" layer="{126,100,1}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_BlkIt.ufo" name="Aktiv Grotesk Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="Aktiv Grotesk Hair Italic" familyname="Aktiv Grotesk" stylename="Hair Italic" filename="../instances/AktivGrotesk_HairIt.ufo" postscriptfontname="AktivGrotesk-HairItalic" stylemapfamilyname="Aktiv Grotesk Hair" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Thin Italic" familyname="Aktiv Grotesk" stylename="Thin Italic" filename="../instances/AktivGrotesk_ThIt.ufo" postscriptfontname="AktivGrotesk-ThinItalic" stylemapfamilyname="Aktiv Grotesk Thin" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Light Italic" familyname="Aktiv Grotesk" stylename="Light Italic" filename="../instances/AktivGrotesk_LtIt.ufo" postscriptfontname="AktivGrotesk-LightItalic" stylemapfamilyname="Aktiv Grotesk Light" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Italic" familyname="Aktiv Grotesk" stylename="Italic" filename="../instances/AktivGrotesk_It.ufo" postscriptfontname="AktivGrotesk-Italic" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Medium Italic" familyname="Aktiv Grotesk" stylename="Medium Italic" filename="../instances/AktivGrotesk_MdIt.ufo" postscriptfontname="AktivGrotesk-MediumItalic" stylemapfamilyname="Aktiv Grotesk Medium" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk SemiBold Italic" familyname="Aktiv Grotesk" stylename="SemiBold Italic" filename="../../build/instances/AktivGrotesk_SBdIt.ufo" postscriptfontname="AktivGrotesk-SemiBoldItalic" stylemapfamilyname="Aktiv Grotesk SemiBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Bold Italic" familyname="Aktiv Grotesk" stylename="Bold Italic" filename="../instances/AktivGrotesk_BdIt.ufo" postscriptfontname="AktivGrotesk-BoldItalic" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk XBold Italic" familyname="Aktiv Grotesk" stylename="XBold Italic" filename="../instances/AktivGrotesk_XBdIt.ufo" postscriptfontname="AktivGrotesk-XBoldItalic" stylemapfamilyname="Aktiv Grotesk XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Black Italic" familyname="Aktiv Grotesk" stylename="Black Italic" filename="../instances/AktivGrotesk_BlkIt.ufo" postscriptfontname="AktivGrotesk-BlackItalic" stylemapfamilyname="Aktiv Grotesk Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/split_output/AktivGroteskVF_Italics_WghtWdth.designspace

@@ -0,0 +1,262 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="Weight" minimum="100" maximum="900" default="400">
+      <map input="100" output="22"/>
+      <map input="200" output="38"/>
+      <map input="300" output="57"/>
+      <map input="400" output="84"/>
+      <map input="500" output="98"/>
+      <map input="600" output="115"/>
+      <map input="700" output="133"/>
+      <map input="800" output="158"/>
+      <map input="900" output="185"/>
+    </axis>
+    <axis tag="wdth" name="Width" minimum="75" maximum="125" default="100"/>
+  </axes>
+  <rules processing="last">
+    <rule name="BRACKET.CYR">
+      <sub name="ghe.loclSRB" with="ghe.ital.loclSRB"/>
+      <sub name="ghe.loclMKD" with="ghe.ital.loclMKD"/>
+      <sub name="de.loclMKDSRB" with="de.ital.loclMKDSRB"/>
+      <sub name="pe.loclMKDSRB" with="pe.ital.loclMKDSRB"/>
+      <sub name="te.loclMKDSRB" with="te.ital.loclMKDSRB"/>
+      <sub name="gje.loclMKD" with="gje.ital.loclMKD"/>
+      <sub name="sha.loclMKDSRB" with="sha.ital.loclMKDSRB"/>
+    </rule>
+    <rule name="BRACKET.116.185">
+      <conditionset>
+        <condition name="Weight" minimum="116" maximum="185"/>
+        <condition name="Width" minimum="75" maximum="97.5"/>
+      </conditionset>
+      <sub name="cent" with="cent.BRACKET.130"/>
+      <sub name="dollar" with="dollar.BRACKET.130"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="../AktivGroteskCd_HairIt.ufo" name="Aktiv Grotesk Cd Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_HairIt.ufo" name="Aktiv Grotesk Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_HairIt.ufo" name="Aktiv Grotesk Ex Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_It.ufo" name="Aktiv Grotesk Cd Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic {126,100,1}" layer="{126,100,1}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_It.ufo" name="Aktiv Grotesk Ex Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_BlkIt.ufo" name="Aktiv Grotesk Cd Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_BlkIt.ufo" name="Aktiv Grotesk Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_BlkIt.ufo" name="Aktiv Grotesk Ex Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="Aktiv Grotesk Cd Hair Italic" familyname="Aktiv Grotesk" stylename="Cd Hair Italic" filename="../instances/AktivGroteskCd_HairIt.ufo" postscriptfontname="AktivGrotesk-CdHairItalic" stylemapfamilyname="Aktiv Grotesk Cd Hair" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Hair Italic" familyname="Aktiv Grotesk" stylename="Hair Italic" filename="../instances/AktivGrotesk_HairIt.ufo" postscriptfontname="AktivGrotesk-HairItalic" stylemapfamilyname="Aktiv Grotesk Hair" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Hair Italic" familyname="Aktiv Grotesk" stylename="Ex Hair Italic" filename="../instances/AktivGroteskEx_HairIt.ufo" postscriptfontname="AktivGrotesk-ExHairItalic" stylemapfamilyname="Aktiv Grotesk Ex Hair" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Thin Italic" familyname="Aktiv Grotesk" stylename="Cd Thin Italic" filename="../instances/AktivGroteskCd_ThIt.ufo" postscriptfontname="AktivGrotesk-CdThinItalic" stylemapfamilyname="Aktiv Grotesk Cd Thin" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Thin Italic" familyname="Aktiv Grotesk" stylename="Thin Italic" filename="../instances/AktivGrotesk_ThIt.ufo" postscriptfontname="AktivGrotesk-ThinItalic" stylemapfamilyname="Aktiv Grotesk Thin" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Thin Italic" familyname="Aktiv Grotesk" stylename="Ex Thin Italic" filename="../instances/AktivGroteskEx_ThIt.ufo" postscriptfontname="AktivGrotesk-ExThinItalic" stylemapfamilyname="Aktiv Grotesk Ex Thin" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Light Italic" familyname="Aktiv Grotesk" stylename="Cd Light Italic" filename="../instances/AktivGroteskCd_LtIt.ufo" postscriptfontname="AktivGrotesk-CdLightItalic" stylemapfamilyname="Aktiv Grotesk Cd Light" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Light Italic" familyname="Aktiv Grotesk" stylename="Light Italic" filename="../instances/AktivGrotesk_LtIt.ufo" postscriptfontname="AktivGrotesk-LightItalic" stylemapfamilyname="Aktiv Grotesk Light" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Light Italic" familyname="Aktiv Grotesk" stylename="Ex Light Italic" filename="../instances/AktivGroteskEx_LtIt.ufo" postscriptfontname="AktivGrotesk-ExLightItalic" stylemapfamilyname="Aktiv Grotesk Ex Light" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Italic" familyname="Aktiv Grotesk" stylename="Cd Italic" filename="../instances/AktivGroteskCd_It.ufo" postscriptfontname="AktivGrotesk-CdItalic" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Italic" familyname="Aktiv Grotesk" stylename="Italic" filename="../instances/AktivGrotesk_It.ufo" postscriptfontname="AktivGrotesk-Italic" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Italic" familyname="Aktiv Grotesk" stylename="Ex Italic" filename="../instances/AktivGroteskEx_It.ufo" postscriptfontname="AktivGrotesk-ExItalic" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Medium Italic" familyname="Aktiv Grotesk" stylename="Cd Medium Italic" filename="../instances/AktivGroteskCd_MdIt.ufo" postscriptfontname="AktivGrotesk-CdMediumItalic" stylemapfamilyname="Aktiv Grotesk Cd Medium" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Medium Italic" familyname="Aktiv Grotesk" stylename="Medium Italic" filename="../instances/AktivGrotesk_MdIt.ufo" postscriptfontname="AktivGrotesk-MediumItalic" stylemapfamilyname="Aktiv Grotesk Medium" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Medium Italic" familyname="Aktiv Grotesk" stylename="Ex Medium Italic" filename="../instances/AktivGroteskEx_MdIt.ufo" postscriptfontname="AktivGrotesk-ExMediumItalic" stylemapfamilyname="Aktiv Grotesk Ex Medium" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd SemiBold Italic" familyname="Aktiv Grotesk" stylename="Cd SemiBold Italic" filename="../../build/instances/AktivGroteskCd_SBdIt.ufo" postscriptfontname="AktivGrotesk-CdSemiBoldItalic" stylemapfamilyname="Aktiv Grotesk Cd SemiBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk SemiBold Italic" familyname="Aktiv Grotesk" stylename="SemiBold Italic" filename="../../build/instances/AktivGrotesk_SBdIt.ufo" postscriptfontname="AktivGrotesk-SemiBoldItalic" stylemapfamilyname="Aktiv Grotesk SemiBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex SemiBold Italic" familyname="Aktiv Grotesk" stylename="Ex SemiBold Italic" filename="../../build/instances/AktivGroteskEx_SBdIt.ufo" postscriptfontname="AktivGrotesk-ExSemiBoldItalic" stylemapfamilyname="Aktiv Grotesk Ex SemiBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Bold Italic" familyname="Aktiv Grotesk" stylename="Cd Bold Italic" filename="../instances/AktivGroteskCd_BdIt.ufo" postscriptfontname="AktivGrotesk-CdBoldItalic" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Bold Italic" familyname="Aktiv Grotesk" stylename="Bold Italic" filename="../instances/AktivGrotesk_BdIt.ufo" postscriptfontname="AktivGrotesk-BoldItalic" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Bold Italic" familyname="Aktiv Grotesk" stylename="Ex Bold Italic" filename="../instances/AktivGroteskEx_BdIt.ufo" postscriptfontname="AktivGrotesk-ExBoldItalic" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd XBold Italic" familyname="Aktiv Grotesk" stylename="Cd XBold Italic" filename="../instances/AktivGroteskCd_XBdIt.ufo" postscriptfontname="AktivGrotesk-CdXBoldItalic" stylemapfamilyname="Aktiv Grotesk Cd XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk XBold Italic" familyname="Aktiv Grotesk" stylename="XBold Italic" filename="../instances/AktivGrotesk_XBdIt.ufo" postscriptfontname="AktivGrotesk-XBoldItalic" stylemapfamilyname="Aktiv Grotesk XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex XBold Italic" familyname="Aktiv Grotesk" stylename="Ex XBold Italic" filename="../instances/AktivGroteskEx_XBdIt.ufo" postscriptfontname="AktivGrotesk-ExXBoldItalic" stylemapfamilyname="Aktiv Grotesk Ex XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Black Italic" familyname="Aktiv Grotesk" stylename="Cd Black Italic" filename="../instances/AktivGroteskCd_BlkIt.ufo" postscriptfontname="AktivGrotesk-CdBlackItalic" stylemapfamilyname="Aktiv Grotesk Cd Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Black Italic" familyname="Aktiv Grotesk" stylename="Black Italic" filename="../instances/AktivGrotesk_BlkIt.ufo" postscriptfontname="AktivGrotesk-BlackItalic" stylemapfamilyname="Aktiv Grotesk Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Black Italic" familyname="Aktiv Grotesk" stylename="Ex Black Italic" filename="../instances/AktivGroteskEx_BlkIt.ufo" postscriptfontname="AktivGrotesk-ExBlackItalic" stylemapfamilyname="Aktiv Grotesk Ex Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/split_output/AktivGroteskVF_Wght.designspace

@@ -0,0 +1,85 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="Weight" minimum="100" maximum="900" default="400">
+      <map input="100" output="22"/>
+      <map input="200" output="38"/>
+      <map input="300" output="57"/>
+      <map input="400" output="84"/>
+      <map input="500" output="98"/>
+      <map input="600" output="115"/>
+      <map input="700" output="133"/>
+      <map input="800" output="158"/>
+      <map input="900" output="185"/>
+    </axis>
+  </axes>
+  <sources>
+    <source filename="../AktivGrotesk_Hair.ufo" name="Aktiv Grotesk Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" familyname="Aktiv Grotesk">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" layer="{126,100,0}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Blk.ufo" name="Aktiv Grotesk Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="Aktiv Grotesk Hair" familyname="Aktiv Grotesk" stylename="Hair" filename="../instances/AktivGrotesk_Hair.ufo" postscriptfontname="AktivGrotesk-Hair" stylemapfamilyname="Aktiv Grotesk Hair" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Thin" familyname="Aktiv Grotesk" stylename="Thin" filename="../instances/AktivGrotesk_Th.ufo" postscriptfontname="AktivGrotesk-Thin" stylemapfamilyname="Aktiv Grotesk Thin" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Light" familyname="Aktiv Grotesk" stylename="Light" filename="../instances/AktivGrotesk_Lt.ufo" postscriptfontname="AktivGrotesk-Light" stylemapfamilyname="Aktiv Grotesk Light" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk " familyname="Aktiv Grotesk" stylename="" filename="../instances/AktivGrotesk_Rg.ufo" postscriptfontname="AktivGrotesk-" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Medium" familyname="Aktiv Grotesk" stylename="Medium" filename="../instances/AktivGrotesk_Md.ufo" postscriptfontname="AktivGrotesk-Medium" stylemapfamilyname="Aktiv Grotesk Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk SemiBold" familyname="Aktiv Grotesk" stylename="SemiBold" filename="../../build/instances/AktivGrotesk_SBd.ufo" postscriptfontname="AktivGrotesk-SemiBold" stylemapfamilyname="Aktiv Grotesk SemiBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Bold" familyname="Aktiv Grotesk" stylename="Bold" filename="../instances/AktivGrotesk_Bd.ufo" postscriptfontname="AktivGrotesk-Bold" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk XBold" familyname="Aktiv Grotesk" stylename="XBold" filename="../instances/AktivGrotesk_XBd.ufo" postscriptfontname="AktivGrotesk-XBold" stylemapfamilyname="Aktiv Grotesk XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Black" familyname="Aktiv Grotesk" stylename="Black" filename="../instances/AktivGrotesk_Blk.ufo" postscriptfontname="AktivGrotesk-Black" stylemapfamilyname="Aktiv Grotesk Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/split_output/AktivGroteskVF_WghtWdth.designspace

@@ -0,0 +1,253 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="Weight" minimum="100" maximum="900" default="400">
+      <map input="100" output="22"/>
+      <map input="200" output="38"/>
+      <map input="300" output="57"/>
+      <map input="400" output="84"/>
+      <map input="500" output="98"/>
+      <map input="600" output="115"/>
+      <map input="700" output="133"/>
+      <map input="800" output="158"/>
+      <map input="900" output="185"/>
+    </axis>
+    <axis tag="wdth" name="Width" minimum="75" maximum="125" default="100"/>
+  </axes>
+  <rules processing="last">
+    <rule name="BRACKET.116.185">
+      <conditionset>
+        <condition name="Weight" minimum="116" maximum="185"/>
+        <condition name="Width" minimum="75" maximum="97.5"/>
+      </conditionset>
+      <sub name="cent" with="cent.BRACKET.130"/>
+      <sub name="dollar" with="dollar.BRACKET.130"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="../AktivGroteskCd_Hair.ufo" name="Aktiv Grotesk Cd Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Hair.ufo" name="Aktiv Grotesk Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_Hair.ufo" name="Aktiv Grotesk Ex Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_Rg.ufo" name="Aktiv Grotesk Cd">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" familyname="Aktiv Grotesk">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" layer="{126,100,0}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_Rg.ufo" name="Aktiv Grotesk Ex">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_Blk.ufo" name="Aktiv Grotesk Cd Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Blk.ufo" name="Aktiv Grotesk Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_Blk.ufo" name="Aktiv Grotesk Ex Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="Aktiv Grotesk Cd Hair" familyname="Aktiv Grotesk" stylename="Cd Hair" filename="../instances/AktivGroteskCd_Hair.ufo" postscriptfontname="AktivGrotesk-CdHair" stylemapfamilyname="Aktiv Grotesk Cd Hair" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Hair" familyname="Aktiv Grotesk" stylename="Hair" filename="../instances/AktivGrotesk_Hair.ufo" postscriptfontname="AktivGrotesk-Hair" stylemapfamilyname="Aktiv Grotesk Hair" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Hair" familyname="Aktiv Grotesk" stylename="Ex Hair" filename="../instances/AktivGroteskEx_Hair.ufo" postscriptfontname="AktivGrotesk-ExHair" stylemapfamilyname="Aktiv Grotesk Ex Hair" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Thin" familyname="Aktiv Grotesk" stylename="Cd Thin" filename="../instances/AktivGroteskCd_Th.ufo" postscriptfontname="AktivGrotesk-CdThin" stylemapfamilyname="Aktiv Grotesk Cd Thin" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Thin" familyname="Aktiv Grotesk" stylename="Thin" filename="../instances/AktivGrotesk_Th.ufo" postscriptfontname="AktivGrotesk-Thin" stylemapfamilyname="Aktiv Grotesk Thin" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Thin" familyname="Aktiv Grotesk" stylename="Ex Thin" filename="../instances/AktivGroteskEx_Th.ufo" postscriptfontname="AktivGrotesk-ExThin" stylemapfamilyname="Aktiv Grotesk Ex Thin" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Light" familyname="Aktiv Grotesk" stylename="Cd Light" filename="../instances/AktivGroteskCd_Lt.ufo" postscriptfontname="AktivGrotesk-CdLight" stylemapfamilyname="Aktiv Grotesk Cd Light" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Light" familyname="Aktiv Grotesk" stylename="Light" filename="../instances/AktivGrotesk_Lt.ufo" postscriptfontname="AktivGrotesk-Light" stylemapfamilyname="Aktiv Grotesk Light" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Light" familyname="Aktiv Grotesk" stylename="Ex Light" filename="../instances/AktivGroteskEx_Lt.ufo" postscriptfontname="AktivGrotesk-ExLight" stylemapfamilyname="Aktiv Grotesk Ex Light" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd" familyname="Aktiv Grotesk" stylename="Cd" filename="../instances/AktivGroteskCd_Rg.ufo" postscriptfontname="AktivGrotesk-Cd" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk " familyname="Aktiv Grotesk" stylename="" filename="../instances/AktivGrotesk_Rg.ufo" postscriptfontname="AktivGrotesk-" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex" familyname="Aktiv Grotesk" stylename="Ex" filename="../instances/AktivGroteskEx_Rg.ufo" postscriptfontname="AktivGrotesk-Ex" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Medium" familyname="Aktiv Grotesk" stylename="Cd Medium" filename="../instances/AktivGroteskCd_Md.ufo" postscriptfontname="AktivGrotesk-CdMedium" stylemapfamilyname="Aktiv Grotesk Cd Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Medium" familyname="Aktiv Grotesk" stylename="Medium" filename="../instances/AktivGrotesk_Md.ufo" postscriptfontname="AktivGrotesk-Medium" stylemapfamilyname="Aktiv Grotesk Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Medium" familyname="Aktiv Grotesk" stylename="Ex Medium" filename="../instances/AktivGroteskEx_Md.ufo" postscriptfontname="AktivGrotesk-ExMedium" stylemapfamilyname="Aktiv Grotesk Ex Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd SemiBold" familyname="Aktiv Grotesk" stylename="Cd SemiBold" filename="../../build/instances/AktivGroteskCd_SBd.ufo" postscriptfontname="AktivGrotesk-CdSemiBold" stylemapfamilyname="Aktiv Grotesk Cd SemiBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk SemiBold" familyname="Aktiv Grotesk" stylename="SemiBold" filename="../../build/instances/AktivGrotesk_SBd.ufo" postscriptfontname="AktivGrotesk-SemiBold" stylemapfamilyname="Aktiv Grotesk SemiBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex SemiBold" familyname="Aktiv Grotesk" stylename="Ex SemiBold" filename="../../build/instances/AktivGroteskEx_SBd.ufo" postscriptfontname="AktivGrotesk-ExSemiBold" stylemapfamilyname="Aktiv Grotesk Ex SemiBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Bold" familyname="Aktiv Grotesk" stylename="Cd Bold" filename="../instances/AktivGroteskCd_Bd.ufo" postscriptfontname="AktivGrotesk-CdBold" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Bold" familyname="Aktiv Grotesk" stylename="Bold" filename="../instances/AktivGrotesk_Bd.ufo" postscriptfontname="AktivGrotesk-Bold" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Bold" familyname="Aktiv Grotesk" stylename="Ex Bold" filename="../instances/AktivGroteskEx_Bd.ufo" postscriptfontname="AktivGrotesk-ExBold" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd XBold" familyname="Aktiv Grotesk" stylename="Cd XBold" filename="../instances/AktivGroteskCd_XBd.ufo" postscriptfontname="AktivGrotesk-CdXBold" stylemapfamilyname="Aktiv Grotesk Cd XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk XBold" familyname="Aktiv Grotesk" stylename="XBold" filename="../instances/AktivGrotesk_XBd.ufo" postscriptfontname="AktivGrotesk-XBold" stylemapfamilyname="Aktiv Grotesk XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex XBold" familyname="Aktiv Grotesk" stylename="Ex XBold" filename="../instances/AktivGroteskEx_XBd.ufo" postscriptfontname="AktivGrotesk-ExXBold" stylemapfamilyname="Aktiv Grotesk Ex XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Black" familyname="Aktiv Grotesk" stylename="Cd Black" filename="../instances/AktivGroteskCd_Blk.ufo" postscriptfontname="AktivGrotesk-CdBlack" stylemapfamilyname="Aktiv Grotesk Cd Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Black" familyname="Aktiv Grotesk" stylename="Black" filename="../instances/AktivGrotesk_Blk.ufo" postscriptfontname="AktivGrotesk-Black" stylemapfamilyname="Aktiv Grotesk Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Black" familyname="Aktiv Grotesk" stylename="Ex Black" filename="../instances/AktivGroteskEx_Blk.ufo" postscriptfontname="AktivGrotesk-ExBlack" stylemapfamilyname="Aktiv Grotesk Ex Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/split_output/AktivGroteskVF_WghtWdthItal.designspace

@@ -0,0 +1,562 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="Weight" minimum="100" maximum="900" default="400">
+      <map input="100" output="22"/>
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+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex SemiBold Italic" familyname="Aktiv Grotesk" stylename="Ex SemiBold Italic" filename="../../build/instances/AktivGroteskEx_SBdIt.ufo" postscriptfontname="AktivGrotesk-ExSemiBoldItalic" stylemapfamilyname="Aktiv Grotesk Ex SemiBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Bold" familyname="Aktiv Grotesk" stylename="Cd Bold" filename="../instances/AktivGroteskCd_Bd.ufo" postscriptfontname="AktivGrotesk-CdBold" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Bold Italic" familyname="Aktiv Grotesk" stylename="Cd Bold Italic" filename="../instances/AktivGroteskCd_BdIt.ufo" postscriptfontname="AktivGrotesk-CdBoldItalic" stylemapfamilyname="Aktiv Grotesk Cd" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Bold" familyname="Aktiv Grotesk" stylename="Bold" filename="../instances/AktivGrotesk_Bd.ufo" postscriptfontname="AktivGrotesk-Bold" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Bold Italic" familyname="Aktiv Grotesk" stylename="Bold Italic" filename="../instances/AktivGrotesk_BdIt.ufo" postscriptfontname="AktivGrotesk-BoldItalic" stylemapfamilyname="Aktiv Grotesk" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Bold" familyname="Aktiv Grotesk" stylename="Ex Bold" filename="../instances/AktivGroteskEx_Bd.ufo" postscriptfontname="AktivGrotesk-ExBold" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="bold">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Bold Italic" familyname="Aktiv Grotesk" stylename="Ex Bold Italic" filename="../instances/AktivGroteskEx_BdIt.ufo" postscriptfontname="AktivGrotesk-ExBoldItalic" stylemapfamilyname="Aktiv Grotesk Ex" stylemapstylename="bold italic">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd XBold" familyname="Aktiv Grotesk" stylename="Cd XBold" filename="../instances/AktivGroteskCd_XBd.ufo" postscriptfontname="AktivGrotesk-CdXBold" stylemapfamilyname="Aktiv Grotesk Cd XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd XBold Italic" familyname="Aktiv Grotesk" stylename="Cd XBold Italic" filename="../instances/AktivGroteskCd_XBdIt.ufo" postscriptfontname="AktivGrotesk-CdXBoldItalic" stylemapfamilyname="Aktiv Grotesk Cd XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk XBold" familyname="Aktiv Grotesk" stylename="XBold" filename="../instances/AktivGrotesk_XBd.ufo" postscriptfontname="AktivGrotesk-XBold" stylemapfamilyname="Aktiv Grotesk XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk XBold Italic" familyname="Aktiv Grotesk" stylename="XBold Italic" filename="../instances/AktivGrotesk_XBdIt.ufo" postscriptfontname="AktivGrotesk-XBoldItalic" stylemapfamilyname="Aktiv Grotesk XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex XBold" familyname="Aktiv Grotesk" stylename="Ex XBold" filename="../instances/AktivGroteskEx_XBd.ufo" postscriptfontname="AktivGrotesk-ExXBold" stylemapfamilyname="Aktiv Grotesk Ex XBold" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex XBold Italic" familyname="Aktiv Grotesk" stylename="Ex XBold Italic" filename="../instances/AktivGroteskEx_XBdIt.ufo" postscriptfontname="AktivGrotesk-ExXBoldItalic" stylemapfamilyname="Aktiv Grotesk Ex XBold" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Black" familyname="Aktiv Grotesk" stylename="Cd Black" filename="../instances/AktivGroteskCd_Blk.ufo" postscriptfontname="AktivGrotesk-CdBlack" stylemapfamilyname="Aktiv Grotesk Cd Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Cd Black Italic" familyname="Aktiv Grotesk" stylename="Cd Black Italic" filename="../instances/AktivGroteskCd_BlkIt.ufo" postscriptfontname="AktivGrotesk-CdBlackItalic" stylemapfamilyname="Aktiv Grotesk Cd Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Black" familyname="Aktiv Grotesk" stylename="Black" filename="../instances/AktivGrotesk_Blk.ufo" postscriptfontname="AktivGrotesk-Black" stylemapfamilyname="Aktiv Grotesk Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Black Italic" familyname="Aktiv Grotesk" stylename="Black Italic" filename="../instances/AktivGrotesk_BlkIt.ufo" postscriptfontname="AktivGrotesk-BlackItalic" stylemapfamilyname="Aktiv Grotesk Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Black" familyname="Aktiv Grotesk" stylename="Ex Black" filename="../instances/AktivGroteskEx_Blk.ufo" postscriptfontname="AktivGrotesk-ExBlack" stylemapfamilyname="Aktiv Grotesk Ex Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Black Italic" familyname="Aktiv Grotesk" stylename="Ex Black Italic" filename="../instances/AktivGroteskEx_BlkIt.ufo" postscriptfontname="AktivGrotesk-ExBlackItalic" stylemapfamilyname="Aktiv Grotesk Ex Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/split_output/MutatorSansVariable_Weight.designspace

@@ -0,0 +1,55 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="weight" minimum="300" maximum="700" default="300">
+      <map input="300" output="0"/>
+      <map input="500" output="500"/>
+      <map input="700" output="1000"/>
+    </axis>
+  </axes>
+  <rules>
+    <rule name="fold_I_serifs">
+      <sub name="I" with="I.narrow"/>
+    </rule>
+    <rule name="fold_S_terminals">
+      <conditionset>
+        <condition name="weight" minimum="0" maximum="500"/>
+      </conditionset>
+      <sub name="S" with="S.closed"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="../MutatorSansLightCondensed.ufo" name="master.MutatorMathTest.LightCondensed.0" familyname="MutatorMathTest" stylename="LightCondensed">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansBoldCondensed.ufo" name="master.MutatorMathTest.BoldCondensed.1" familyname="MutatorMathTest" stylename="BoldCondensed">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansLightCondensed.ufo" name="support.crossbar" layer="support.crossbar">
+      <location>
+        <dimension name="weight" xvalue="700"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="MutatorMathTest Sans Light Condensed" familyname="MutatorMathTest" stylename="Sans Light Condensed" filename="MutatorMathTest-Sans Light Condensed.ttf" postscriptfontname="MutatorMathTest-SansLightCondensed" stylemapfamilyname="MutatorMathTest Sans Light Condensed" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Bold Condensed" familyname="MutatorMathTest" stylename="Sans Bold Condensed" filename="MutatorMathTest-Sans Bold Condensed.ttf" postscriptfontname="MutatorMathTest-SansBoldCondensed" stylemapfamilyname="MutatorMathTest Sans Bold Condensed" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Light Condensed" familyname="MutatorMathTest" stylename="Sans Light Condensed" filename="MutatorMathTest-Sans Light Condensed.ttf" postscriptfontname="MutatorMathTest-SansLightCondensed" stylemapfamilyname="MutatorMathTest Sans Light Condensed" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/split_output/MutatorSansVariable_Weight_Width.designspace

@@ -0,0 +1,129 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="weight" minimum="300" maximum="700" default="300">
+      <map input="300" output="0"/>
+      <map input="500" output="500"/>
+      <map input="700" output="1000"/>
+    </axis>
+    <axis tag="wdth" name="width" minimum="50" maximum="200" default="50">
+      <map input="50" output="0"/>
+      <map input="100" output="500"/>
+      <map input="200" output="1000"/>
+    </axis>
+  </axes>
+  <rules>
+    <rule name="fold_I_serifs">
+      <conditionset>
+        <condition name="width" minimum="0" maximum="328"/>
+      </conditionset>
+      <sub name="I" with="I.narrow"/>
+    </rule>
+    <rule name="fold_S_terminals">
+      <conditionset>
+        <condition name="weight" minimum="0" maximum="500"/>
+      </conditionset>
+      <sub name="S" with="S.closed"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="../MutatorSansLightCondensed.ufo" name="master.MutatorMathTest.LightCondensed.0" familyname="MutatorMathTest" stylename="LightCondensed">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansBoldCondensed.ufo" name="master.MutatorMathTest.BoldCondensed.1" familyname="MutatorMathTest" stylename="BoldCondensed">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansLightWide.ufo" name="master.MutatorMathTest.LightWide.2" familyname="MutatorMathTest" stylename="LightWide">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansBoldWide.ufo" name="master.MutatorMathTest.BoldWide.3" familyname="MutatorMathTest" stylename="BoldWide">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansLightCondensed.ufo" name="support.crossbar" layer="support.crossbar">
+      <location>
+        <dimension name="weight" xvalue="700"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansLightCondensed.ufo" name="support.S.wide" layer="support.S.wide">
+      <location>
+        <dimension name="weight" xvalue="700"/>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansLightCondensed.ufo" name="support.S.middle" layer="support.S.middle">
+      <location>
+        <dimension name="weight" xvalue="700"/>
+        <dimension name="width" xvalue="569.078"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="MutatorMathTest Sans Light Condensed" familyname="MutatorMathTest" stylename="Sans Light Condensed" filename="MutatorMathTest-Sans Light Condensed.ttf" postscriptfontname="MutatorMathTest-SansLightCondensed" stylemapfamilyname="MutatorMathTest Sans Light Condensed" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Bold Condensed" familyname="MutatorMathTest" stylename="Sans Bold Condensed" filename="MutatorMathTest-Sans Bold Condensed.ttf" postscriptfontname="MutatorMathTest-SansBoldCondensed" stylemapfamilyname="MutatorMathTest Sans Bold Condensed" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Light Extended" familyname="MutatorMathTest" stylename="Sans Light Extended" filename="MutatorMathTest-Sans Light Extended.ttf" postscriptfontname="MutatorMathTest-SansLightExtended" stylemapfamilyname="MutatorMathTest Sans Light Extended" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Bold Extended" familyname="MutatorMathTest" stylename="Sans Bold Extended" filename="MutatorMathTest-Sans Bold Extended.ttf" postscriptfontname="MutatorMathTest-SansBoldExtended" stylemapfamilyname="MutatorMathTest Sans Bold Extended" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Medium" familyname="MutatorMathTest" stylename="Sans Medium" filename="MutatorMathTest-Sans Medium.ttf" postscriptfontname="MutatorMathTest-SansMedium" stylemapfamilyname="MutatorMathTest Sans Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="500"/>
+        <dimension name="width" xvalue="327"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Medium" familyname="MutatorMathTest" stylename="Sans Medium" filename="MutatorMathTest-Sans Medium.ttf" postscriptfontname="MutatorMathTest-SansMedium" stylemapfamilyname="MutatorMathTest Sans Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="500"/>
+        <dimension name="width" xvalue="327"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Bold" familyname="MutatorMathTest" stylename="Sans Bold" filename="MutatorMathTest-Sans Bold.ttf" postscriptfontname="MutatorMathTest-SansBold" stylemapfamilyname="MutatorMathTest Sans Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="width" xvalue="569.078"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Medium Extended" familyname="MutatorMathTest" stylename="Sans Medium Extended" filename="MutatorMathTest-Sans Medium Extended.ttf" postscriptfontname="MutatorMathTest-SansMediumExtended" stylemapfamilyname="MutatorMathTest Sans Medium Extended" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="500"/>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Light Condensed" familyname="MutatorMathTest" stylename="Sans Light Condensed" filename="MutatorMathTest-Sans Light Condensed.ttf" postscriptfontname="MutatorMathTest-SansLightCondensed" stylemapfamilyname="MutatorMathTest Sans Light Condensed" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/split_output/MutatorSansVariable_Width.designspace

@@ -0,0 +1,50 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wdth" name="width" minimum="50" maximum="200" default="50">
+      <map input="50" output="0"/>
+      <map input="100" output="500"/>
+      <map input="200" output="1000"/>
+    </axis>
+  </axes>
+  <rules>
+    <rule name="fold_I_serifs">
+      <conditionset>
+        <condition name="width" minimum="0" maximum="328"/>
+      </conditionset>
+      <sub name="I" with="I.narrow"/>
+    </rule>
+    <rule name="fold_S_terminals">
+      <sub name="S" with="S.closed"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="../MutatorSansLightCondensed.ufo" name="master.MutatorMathTest.LightCondensed.0" familyname="MutatorMathTest" stylename="LightCondensed">
+      <location>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansLightWide.ufo" name="master.MutatorMathTest.LightWide.2" familyname="MutatorMathTest" stylename="LightWide">
+      <location>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="MutatorMathTest Sans Light Condensed" familyname="MutatorMathTest" stylename="Sans Light Condensed" filename="MutatorMathTest-Sans Light Condensed.ttf" postscriptfontname="MutatorMathTest-SansLightCondensed" stylemapfamilyname="MutatorMathTest Sans Light Condensed" stylemapstylename="regular">
+      <location>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Light Extended" familyname="MutatorMathTest" stylename="Sans Light Extended" filename="MutatorMathTest-Sans Light Extended.ttf" postscriptfontname="MutatorMathTest-SansLightExtended" stylemapfamilyname="MutatorMathTest Sans Light Extended" stylemapstylename="regular">
+      <location>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Light Condensed" familyname="MutatorMathTest" stylename="Sans Light Condensed" filename="MutatorMathTest-Sans Light Condensed.ttf" postscriptfontname="MutatorMathTest-SansLightCondensed" stylemapfamilyname="MutatorMathTest Sans Light Condensed" stylemapstylename="regular">
+      <location>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/split_output/MutatorSerifVariable_Width.designspace

@@ -0,0 +1,29 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wdth" name="width" minimum="50" maximum="200" default="50">
+      <map input="50" output="0"/>
+      <map input="100" output="500"/>
+      <map input="200" output="1000"/>
+    </axis>
+  </axes>
+  <sources>
+    <source filename="../MutatorSerifLightCondensed.ufo" familyname="MutatorMathTest" stylename="SerifLightCondensed">
+      <location>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../MutatorSerifLightWide.ufo" familyname="MutatorMathTest" stylename="SerifLightWide">
+      <location>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="MutatorMathTest Serif Light Condensed" familyname="MutatorMathTest" stylename="Serif Light Condensed" filename="MutatorMathTest-Serif Light Condensed.ttf" postscriptfontname="MutatorMathTest-SerifLightCondensed" stylemapfamilyname="MutatorMathTest Serif Light Condensed" stylemapstylename="regular">
+      <location>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/split_output/SourceSerif4Variable-Italic.designspace

@@ -0,0 +1,266 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="weight" minimum="200" maximum="900" default="400">
+      <map input="200" output="0"/>
+      <map input="300" output="145"/>
+      <map input="400" output="394"/>
+      <map input="600" output="594"/>
+      <map input="700" output="823"/>
+      <map input="900" output="1000"/>
+    </axis>
+    <axis tag="opsz" name="optical" minimum="8" maximum="60" default="20"/>
+  </axes>
+  <sources>
+    <source filename="../caption/master_0/SourceSerif-Italic_c0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../caption/master_1/SourceSerif-Italic_c1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../caption/master_2/SourceSerif-Italic_c2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../text/master_0/SourceSerif-Italic_0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../text/master_1/SourceSerif-Italic_1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../text/master_2/SourceSerif-Italic_2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../display/master_0/SourceSerif-Italic_d0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+    <source filename="../display/master_1/SourceSerif-Italic_d1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+    <source filename="../display/master_2/SourceSerif-Italic_d2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="Source Serif 4 Caption ExtraLight Italic" familyname="Source Serif 4" stylename="Caption ExtraLight Italic" filename="Source Serif 4-Caption ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionExtraLight" stylemapfamilyname="Source Serif 4 Caption ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Light Italic" familyname="Source Serif 4" stylename="Caption Light Italic" filename="Source Serif 4-Caption Light Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionLight" stylemapfamilyname="Source Serif 4 Caption Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Italic" familyname="Source Serif 4" stylename="Caption Italic" filename="Source Serif 4-Caption Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionRegular" stylemapfamilyname="Source Serif 4 Caption Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Semibold Italic" familyname="Source Serif 4" stylename="Caption Semibold Italic" filename="Source Serif 4-Caption Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionSemibold" stylemapfamilyname="Source Serif 4 Caption Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Bold Italic" familyname="Source Serif 4" stylename="Caption Bold Italic" filename="Source Serif 4-Caption Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionBold" stylemapfamilyname="Source Serif 4 Caption Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Black Italic" familyname="Source Serif 4" stylename="Caption Black Italic" filename="Source Serif 4-Caption Black Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionBlack" stylemapfamilyname="Source Serif 4 Caption Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText ExtraLight Italic" familyname="Source Serif 4" stylename="SmText ExtraLight Italic" filename="Source Serif 4-SmText ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextExtraLight" stylemapfamilyname="Source Serif 4 SmallText ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Light Italic" familyname="Source Serif 4" stylename="SmText Light Italic" filename="Source Serif 4-SmText Light Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextLight" stylemapfamilyname="Source Serif 4 SmallText Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Italic" familyname="Source Serif 4" stylename="SmText Italic" filename="Source Serif 4-SmText Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextRegular" stylemapfamilyname="Source Serif 4 SmallText Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Semibold Italic" familyname="Source Serif 4" stylename="SmText Semibold Italic" filename="Source Serif 4-SmText Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextSemibold" stylemapfamilyname="Source Serif 4 SmallText Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Bold Italic" familyname="Source Serif 4" stylename="SmText Bold Italic" filename="Source Serif 4-SmText Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextBold" stylemapfamilyname="Source Serif 4 SmallText Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Black Italic" familyname="Source Serif 4" stylename="SmText Black Italic" filename="Source Serif 4-SmText Black Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextBlack" stylemapfamilyname="Source Serif 4 SmallText Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 ExtraLight Italic" familyname="Source Serif 4" stylename="ExtraLight Italic" filename="Source Serif 4-ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-ExtraLight" stylemapfamilyname="Source Serif 4 ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Light Italic" familyname="Source Serif 4" stylename="Light Italic" filename="Source Serif 4-Light Italic.ttf" postscriptfontname="SourceSerif4Italic-Light" stylemapfamilyname="Source Serif 4 Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Italic" familyname="Source Serif 4" stylename="Italic" filename="Source Serif 4-Italic.ttf" postscriptfontname="SourceSerif4Italic-Regular" stylemapfamilyname="Source Serif 4 Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Semibold Italic" familyname="Source Serif 4" stylename="Semibold Italic" filename="Source Serif 4-Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-Semibold" stylemapfamilyname="Source Serif 4 Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Bold Italic" familyname="Source Serif 4" stylename="Bold Italic" filename="Source Serif 4-Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-Bold" stylemapfamilyname="Source Serif 4 Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Black Italic" familyname="Source Serif 4" stylename="Black Italic" filename="Source Serif 4-Black Italic.ttf" postscriptfontname="SourceSerif4Italic-Black" stylemapfamilyname="Source Serif 4 Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead ExtraLight Italic" familyname="Source Serif 4" stylename="Subhead ExtraLight Italic" filename="Source Serif 4-Subhead ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadExtraLight" stylemapfamilyname="Source Serif 4 Subhead ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Light Italic" familyname="Source Serif 4" stylename="Subhead Light Italic" filename="Source Serif 4-Subhead Light Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadLight" stylemapfamilyname="Source Serif 4 Subhead Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Italic" familyname="Source Serif 4" stylename="Subhead Italic" filename="Source Serif 4-Subhead Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadRegular" stylemapfamilyname="Source Serif 4 Subhead Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Semibold Italic" familyname="Source Serif 4" stylename="Subhead Semibold Italic" filename="Source Serif 4-Subhead Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadSemibold" stylemapfamilyname="Source Serif 4 Subhead Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Bold Italic" familyname="Source Serif 4" stylename="Subhead Bold Italic" filename="Source Serif 4-Subhead Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadBold" stylemapfamilyname="Source Serif 4 Subhead Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Black Italic" familyname="Source Serif 4" stylename="Subhead Black Italic" filename="Source Serif 4-Subhead Black Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadBlack" stylemapfamilyname="Source Serif 4 Subhead Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display ExtraLight Italic" familyname="Source Serif 4" stylename="Display ExtraLight Italic" filename="Source Serif 4-Display ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayExtraLight" stylemapfamilyname="Source Serif 4 Display ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Light Italic" familyname="Source Serif 4" stylename="Display Light Italic" filename="Source Serif 4-Display Light Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayLight" stylemapfamilyname="Source Serif 4 Display Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Italic" familyname="Source Serif 4" stylename="Display Italic" filename="Source Serif 4-Display Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayRegular" stylemapfamilyname="Source Serif 4 Display Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Semibold Italic" familyname="Source Serif 4" stylename="Display Semibold Italic" filename="Source Serif 4-Display Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplaySemibold" stylemapfamilyname="Source Serif 4 Display Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Bold Italic" familyname="Source Serif 4" stylename="Display Bold Italic" filename="Source Serif 4-Display Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayBold" stylemapfamilyname="Source Serif 4 Display Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Black Italic" familyname="Source Serif 4" stylename="Display Black Italic" filename="Source Serif 4-Display Black Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayBlack" stylemapfamilyname="Source Serif 4 Display Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+  </instances>
+  <lib>
+    <dict>
+      <key>public.skipExportGlyphs</key>
+      <array>
+        <string>caron.alt</string>
+        <string>commabelowcmb.alt</string>
+        <string>f.liga</string>
+        <string>f.ligalong</string>
+        <string>tonos.cap</string>
+        <string>dieresiscmb.tight</string>
+        <string>turkicdsccmb</string>
+      </array>
+    </dict>
+  </lib>
+</designspace>

Tests/designspaceLib/data/split_output/SourceSerif4Variable-Roman.designspace

@@ -0,0 +1,274 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="weight" minimum="200" maximum="900" default="400">
+      <map input="200" output="0"/>
+      <map input="300" output="145"/>
+      <map input="400" output="394"/>
+      <map input="600" output="594"/>
+      <map input="700" output="823"/>
+      <map input="900" output="1000"/>
+    </axis>
+    <axis tag="opsz" name="optical" minimum="8" maximum="60" default="20"/>
+  </axes>
+  <sources>
+    <source filename="../caption/master_0/SourceSerif_c0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../caption/master_1/SourceSerif_c1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../caption/master_2/SourceSerif_c2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../text/master_0/SourceSerif_0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../text/master_1/SourceSerif_1.ufo" familyname="Source Serif 4">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../text/master_2/SourceSerif_2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../display/master_0/SourceSerif_d0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+    <source filename="../display/master_1/SourceSerif_d1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+    <source filename="../display/master_2/SourceSerif_d2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="Source Serif 4 Caption ExtraLight" familyname="Source Serif 4" stylename="Caption ExtraLight" filename="Source Serif 4-Caption ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-CaptionExtraLight" stylemapfamilyname="Source Serif 4 Caption ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Light" familyname="Source Serif 4" stylename="Caption Light" filename="Source Serif 4-Caption Light.ttf" postscriptfontname="SourceSerif4Roman-CaptionLight" stylemapfamilyname="Source Serif 4 Caption Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption" familyname="Source Serif 4" stylename="Caption" filename="Source Serif 4-Caption.ttf" postscriptfontname="SourceSerif4Roman-CaptionRegular" stylemapfamilyname="Source Serif 4 Caption" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Semibold" familyname="Source Serif 4" stylename="Caption Semibold" filename="Source Serif 4-Caption Semibold.ttf" postscriptfontname="SourceSerif4Roman-CaptionSemibold" stylemapfamilyname="Source Serif 4 Caption Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Bold" familyname="Source Serif 4" stylename="Caption Bold" filename="Source Serif 4-Caption Bold.ttf" postscriptfontname="SourceSerif4Roman-CaptionBold" stylemapfamilyname="Source Serif 4 Caption Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Black" familyname="Source Serif 4" stylename="Caption Black" filename="Source Serif 4-Caption Black.ttf" postscriptfontname="SourceSerif4Roman-CaptionBlack" stylemapfamilyname="Source Serif 4 Caption Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText ExtraLight" familyname="Source Serif 4" stylename="SmText ExtraLight" filename="Source Serif 4-SmText ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-SmTextExtraLight" stylemapfamilyname="Source Serif 4 SmallText ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Light" familyname="Source Serif 4" stylename="SmText Light" filename="Source Serif 4-SmText Light.ttf" postscriptfontname="SourceSerif4Roman-SmTextLight" stylemapfamilyname="Source Serif 4 SmallText Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText" familyname="Source Serif 4" stylename="SmText" filename="Source Serif 4-SmText.ttf" postscriptfontname="SourceSerif4Roman-SmTextRegular" stylemapfamilyname="Source Serif 4 SmallText" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Semibold" familyname="Source Serif 4" stylename="SmText Semibold" filename="Source Serif 4-SmText Semibold.ttf" postscriptfontname="SourceSerif4Roman-SmTextSemibold" stylemapfamilyname="Source Serif 4 SmallText Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Bold" familyname="Source Serif 4" stylename="SmText Bold" filename="Source Serif 4-SmText Bold.ttf" postscriptfontname="SourceSerif4Roman-SmTextBold" stylemapfamilyname="Source Serif 4 SmallText Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Black" familyname="Source Serif 4" stylename="SmText Black" filename="Source Serif 4-SmText Black.ttf" postscriptfontname="SourceSerif4Roman-SmTextBlack" stylemapfamilyname="Source Serif 4 SmallText Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 ExtraLight" familyname="Source Serif 4" stylename="ExtraLight" filename="Source Serif 4-ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-ExtraLight" stylemapfamilyname="Source Serif 4 ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Light" familyname="Source Serif 4" stylename="Light" filename="Source Serif 4-Light.ttf" postscriptfontname="SourceSerif4Roman-Light" stylemapfamilyname="Source Serif 4 Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Regular" familyname="Source Serif 4" stylename="Regular" filename="Source Serif 4-Regular.ttf" postscriptfontname="SourceSerif4Roman-Regular" stylemapfamilyname="Source Serif 4" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Semibold" familyname="Source Serif 4" stylename="Semibold" filename="Source Serif 4-Semibold.ttf" postscriptfontname="SourceSerif4Roman-Semibold" stylemapfamilyname="Source Serif 4 Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Bold" familyname="Source Serif 4" stylename="Bold" filename="Source Serif 4-Bold.ttf" postscriptfontname="SourceSerif4Roman-Bold" stylemapfamilyname="Source Serif 4 Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Black" familyname="Source Serif 4" stylename="Black" filename="Source Serif 4-Black.ttf" postscriptfontname="SourceSerif4Roman-Black" stylemapfamilyname="Source Serif 4 Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead ExtraLight" familyname="Source Serif 4" stylename="Subhead ExtraLight" filename="Source Serif 4-Subhead ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-SubheadExtraLight" stylemapfamilyname="Source Serif 4 Subhead ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Light" familyname="Source Serif 4" stylename="Subhead Light" filename="Source Serif 4-Subhead Light.ttf" postscriptfontname="SourceSerif4Roman-SubheadLight" stylemapfamilyname="Source Serif 4 Subhead Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead" familyname="Source Serif 4" stylename="Subhead" filename="Source Serif 4-Subhead.ttf" postscriptfontname="SourceSerif4Roman-SubheadRegular" stylemapfamilyname="Source Serif 4 Subhead" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Semibold" familyname="Source Serif 4" stylename="Subhead Semibold" filename="Source Serif 4-Subhead Semibold.ttf" postscriptfontname="SourceSerif4Roman-SubheadSemibold" stylemapfamilyname="Source Serif 4 Subhead Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Bold" familyname="Source Serif 4" stylename="Subhead Bold" filename="Source Serif 4-Subhead Bold.ttf" postscriptfontname="SourceSerif4Roman-SubheadBold" stylemapfamilyname="Source Serif 4 Subhead Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Black" familyname="Source Serif 4" stylename="Subhead Black" filename="Source Serif 4-Subhead Black.ttf" postscriptfontname="SourceSerif4Roman-SubheadBlack" stylemapfamilyname="Source Serif 4 Subhead Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display ExtraLight" familyname="Source Serif 4" stylename="Display ExtraLight" filename="Source Serif 4-Display ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-DisplayExtraLight" stylemapfamilyname="Source Serif 4 Display ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Light" familyname="Source Serif 4" stylename="Display Light" filename="Source Serif 4-Display Light.ttf" postscriptfontname="SourceSerif4Roman-DisplayLight" stylemapfamilyname="Source Serif 4 Display Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display" familyname="Source Serif 4" stylename="Display" filename="Source Serif 4-Display.ttf" postscriptfontname="SourceSerif4Roman-DisplayRegular" stylemapfamilyname="Source Serif 4 Display" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Semibold" familyname="Source Serif 4" stylename="Display Semibold" filename="Source Serif 4-Display Semibold.ttf" postscriptfontname="SourceSerif4Roman-DisplaySemibold" stylemapfamilyname="Source Serif 4 Display Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Bold" familyname="Source Serif 4" stylename="Display Bold" filename="Source Serif 4-Display Bold.ttf" postscriptfontname="SourceSerif4Roman-DisplayBold" stylemapfamilyname="Source Serif 4 Display Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Black" familyname="Source Serif 4" stylename="Display Black" filename="Source Serif 4-Display Black.ttf" postscriptfontname="SourceSerif4Roman-DisplayBlack" stylemapfamilyname="Source Serif 4 Display Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+  </instances>
+  <lib>
+    <dict>
+      <key>public.skipExportGlyphs</key>
+      <array>
+        <string>caron.alt</string>
+        <string>commabelowcmb.alt</string>
+        <string>tonos.cap</string>
+        <string>f.ligalong</string>
+        <string>dieresiscmb.tight</string>
+        <string>IJ</string>
+        <string>Tbar</string>
+        <string>colontriangularmod</string>
+        <string>crossmark</string>
+        <string>ij</string>
+        <string>overline</string>
+        <string>similar</string>
+        <string>tbar</string>
+        <string>triangularbullet</string>
+        <string>turkicdsccmb</string>
+      </array>
+    </dict>
+  </lib>
+</designspace>

Tests/designspaceLib/data/split_output/test_v5_MutatorSans_and_Serif_serif_0.0.designspace

@@ -0,0 +1,147 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="weight" minimum="300" maximum="700" default="300">
+      <map input="300" output="0"/>
+      <map input="500" output="500"/>
+      <map input="700" output="1000"/>
+    </axis>
+    <axis tag="wdth" name="width" minimum="50" maximum="200" default="50">
+      <map input="50" output="0"/>
+      <map input="100" output="500"/>
+      <map input="200" output="1000"/>
+    </axis>
+  </axes>
+  <rules>
+    <rule name="fold_I_serifs">
+      <conditionset>
+        <condition name="width" minimum="0" maximum="328"/>
+      </conditionset>
+      <sub name="I" with="I.narrow"/>
+    </rule>
+    <rule name="fold_S_terminals">
+      <conditionset>
+        <condition name="weight" minimum="0" maximum="500"/>
+      </conditionset>
+      <sub name="S" with="S.closed"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="../MutatorSansLightCondensed.ufo" name="master.MutatorMathTest.LightCondensed.0" familyname="MutatorMathTest" stylename="LightCondensed">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansBoldCondensed.ufo" name="master.MutatorMathTest.BoldCondensed.1" familyname="MutatorMathTest" stylename="BoldCondensed">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansLightWide.ufo" name="master.MutatorMathTest.LightWide.2" familyname="MutatorMathTest" stylename="LightWide">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansBoldWide.ufo" name="master.MutatorMathTest.BoldWide.3" familyname="MutatorMathTest" stylename="BoldWide">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansLightCondensed.ufo" name="support.crossbar" layer="support.crossbar">
+      <location>
+        <dimension name="weight" xvalue="700"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansLightCondensed.ufo" name="support.S.wide" layer="support.S.wide">
+      <location>
+        <dimension name="weight" xvalue="700"/>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="../MutatorSansLightCondensed.ufo" name="support.S.middle" layer="support.S.middle">
+      <location>
+        <dimension name="weight" xvalue="700"/>
+        <dimension name="width" xvalue="569.078"/>
+      </location>
+    </source>
+  </sources>
+  <variable-fonts>
+    <variable-font name="MutatorSansVariable_Weight_Width">
+      <axis-subsets>
+        <axis-subset name="weight"/>
+        <axis-subset name="width"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="MutatorSansVariable_Weight">
+      <axis-subsets>
+        <axis-subset name="weight"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="MutatorSansVariable_Width">
+      <axis-subsets>
+        <axis-subset name="width"/>
+      </axis-subsets>
+    </variable-font>
+  </variable-fonts>
+  <instances>
+    <instance name="MutatorMathTest Sans Light Condensed" familyname="MutatorMathTest" stylename="Sans Light Condensed" filename="MutatorMathTest-Sans Light Condensed.ttf" postscriptfontname="MutatorMathTest-SansLightCondensed" stylemapfamilyname="MutatorMathTest Sans Light Condensed" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Bold Condensed" familyname="MutatorMathTest" stylename="Sans Bold Condensed" filename="MutatorMathTest-Sans Bold Condensed.ttf" postscriptfontname="MutatorMathTest-SansBoldCondensed" stylemapfamilyname="MutatorMathTest Sans Bold Condensed" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Light Extended" familyname="MutatorMathTest" stylename="Sans Light Extended" filename="MutatorMathTest-Sans Light Extended.ttf" postscriptfontname="MutatorMathTest-SansLightExtended" stylemapfamilyname="MutatorMathTest Sans Light Extended" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Bold Extended" familyname="MutatorMathTest" stylename="Sans Bold Extended" filename="MutatorMathTest-Sans Bold Extended.ttf" postscriptfontname="MutatorMathTest-SansBoldExtended" stylemapfamilyname="MutatorMathTest Sans Bold Extended" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Medium" familyname="MutatorMathTest" stylename="Sans Medium" filename="MutatorMathTest-Sans Medium.ttf" postscriptfontname="MutatorMathTest-SansMedium" stylemapfamilyname="MutatorMathTest Sans Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="500"/>
+        <dimension name="width" xvalue="327"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Medium" familyname="MutatorMathTest" stylename="Sans Medium" filename="MutatorMathTest-Sans Medium.ttf" postscriptfontname="MutatorMathTest-SansMedium" stylemapfamilyname="MutatorMathTest Sans Medium" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="500"/>
+        <dimension name="width" xvalue="327"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Bold" familyname="MutatorMathTest" stylename="Sans Bold" filename="MutatorMathTest-Sans Bold.ttf" postscriptfontname="MutatorMathTest-SansBold" stylemapfamilyname="MutatorMathTest Sans Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="width" xvalue="569.078"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Medium Extended" familyname="MutatorMathTest" stylename="Sans Medium Extended" filename="MutatorMathTest-Sans Medium Extended.ttf" postscriptfontname="MutatorMathTest-SansMediumExtended" stylemapfamilyname="MutatorMathTest Sans Medium Extended" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="500"/>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </instance>
+    <instance name="MutatorMathTest Sans Light Condensed" familyname="MutatorMathTest" stylename="Sans Light Condensed" filename="MutatorMathTest-Sans Light Condensed.ttf" postscriptfontname="MutatorMathTest-SansLightCondensed" stylemapfamilyname="MutatorMathTest Sans Light Condensed" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/split_output/test_v5_MutatorSans_and_Serif_serif_1.0.designspace

@@ -0,0 +1,44 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="weight" minimum="300" maximum="700" default="300">
+      <map input="300" output="0"/>
+      <map input="500" output="500"/>
+      <map input="700" output="1000"/>
+    </axis>
+    <axis tag="wdth" name="width" minimum="50" maximum="200" default="50">
+      <map input="50" output="0"/>
+      <map input="100" output="500"/>
+      <map input="200" output="1000"/>
+    </axis>
+  </axes>
+  <sources>
+    <source filename="../MutatorSerifLightCondensed.ufo" familyname="MutatorMathTest" stylename="SerifLightCondensed">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../MutatorSerifLightWide.ufo" familyname="MutatorMathTest" stylename="SerifLightWide">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="1000"/>
+      </location>
+    </source>
+  </sources>
+  <variable-fonts>
+    <variable-font name="MutatorSerifVariable_Width">
+      <axis-subsets>
+        <axis-subset name="width"/>
+      </axis-subsets>
+    </variable-font>
+  </variable-fonts>
+  <instances>
+    <instance name="MutatorMathTest Serif Light Condensed" familyname="MutatorMathTest" stylename="Serif Light Condensed" filename="MutatorMathTest-Serif Light Condensed.ttf" postscriptfontname="MutatorMathTest-SerifLightCondensed" stylemapfamilyname="MutatorMathTest Serif Light Condensed" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="0"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/split_output/test_v5_aktiv_.designspace

@@ -0,0 +1,595 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="Weight" minimum="100" maximum="900" default="400">
+      <map input="100" output="22"/>
+      <map input="200" output="38"/>
+      <map input="300" output="57"/>
+      <map input="400" output="84"/>
+      <map input="500" output="98"/>
+      <map input="600" output="115"/>
+      <map input="700" output="133"/>
+      <map input="800" output="158"/>
+      <map input="900" output="185"/>
+    </axis>
+    <axis tag="wdth" name="Width" minimum="75" maximum="125" default="100"/>
+    <axis tag="ital" name="Italic" minimum="0" maximum="1" default="0"/>
+  </axes>
+  <rules processing="last">
+    <rule name="BRACKET.CYR">
+      <conditionset>
+        <condition name="Italic" minimum="0.1" maximum="1"/>
+      </conditionset>
+      <sub name="ghe.loclSRB" with="ghe.ital.loclSRB"/>
+      <sub name="ghe.loclMKD" with="ghe.ital.loclMKD"/>
+      <sub name="de.loclMKDSRB" with="de.ital.loclMKDSRB"/>
+      <sub name="pe.loclMKDSRB" with="pe.ital.loclMKDSRB"/>
+      <sub name="te.loclMKDSRB" with="te.ital.loclMKDSRB"/>
+      <sub name="gje.loclMKD" with="gje.ital.loclMKD"/>
+      <sub name="sha.loclMKDSRB" with="sha.ital.loclMKDSRB"/>
+    </rule>
+    <rule name="BRACKET.116.185">
+      <conditionset>
+        <condition name="Weight" minimum="116" maximum="185"/>
+        <condition name="Width" minimum="75" maximum="97.5"/>
+      </conditionset>
+      <sub name="cent" with="cent.BRACKET.130"/>
+      <sub name="dollar" with="dollar.BRACKET.130"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="../AktivGroteskCd_Hair.ufo" name="Aktiv Grotesk Cd Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_HairIt.ufo" name="Aktiv Grotesk Cd Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Hair.ufo" name="Aktiv Grotesk Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_HairIt.ufo" name="Aktiv Grotesk Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_Hair.ufo" name="Aktiv Grotesk Ex Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_HairIt.ufo" name="Aktiv Grotesk Ex Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_Rg.ufo" name="Aktiv Grotesk Cd">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_It.ufo" name="Aktiv Grotesk Cd Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" familyname="Aktiv Grotesk">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" layer="{126,100,0}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic {126,100,1}" layer="{126,100,1}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_Rg.ufo" name="Aktiv Grotesk Ex">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_It.ufo" name="Aktiv Grotesk Ex Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_Blk.ufo" name="Aktiv Grotesk Cd Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskCd_BlkIt.ufo" name="Aktiv Grotesk Cd Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_Blk.ufo" name="Aktiv Grotesk Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGrotesk_BlkIt.ufo" name="Aktiv Grotesk Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_Blk.ufo" name="Aktiv Grotesk Ex Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="../AktivGroteskEx_BlkIt.ufo" name="Aktiv Grotesk Ex Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+  </sources>
+  <variable-fonts>
+    <variable-font name="AktivGroteskVF_WghtWdthItal">
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+        <axis-subset name="Width"/>
+        <axis-subset name="Italic"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="AktivGroteskVF_WghtWdth">
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+        <axis-subset name="Width"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="AktivGroteskVF_Wght">
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="AktivGroteskVF_Italics_WghtWdth">
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+        <axis-subset name="Width"/>
+        <axis-subset name="Italic" uservalue="1"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="AktivGroteskVF_Italics_Wght">
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+        <axis-subset name="Italic" uservalue="1"/>
+      </axis-subsets>
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+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Black" familyname="Aktiv Grotesk" stylename="Ex Black" filename="../instances/AktivGroteskEx_Blk.ufo" postscriptfontname="AktivGrotesk-ExBlack" stylemapfamilyname="Aktiv Grotesk Ex Black" stylemapstylename="regular">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance name="Aktiv Grotesk Ex Black Italic" familyname="Aktiv Grotesk" stylename="Ex Black Italic" filename="../instances/AktivGroteskEx_BlkIt.ufo" postscriptfontname="AktivGrotesk-ExBlackItalic" stylemapfamilyname="Aktiv Grotesk Ex Black" stylemapstylename="italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/split_output/test_v5_sourceserif_italic_0.0.designspace

@@ -0,0 +1,282 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="weight" minimum="200" maximum="900" default="400">
+      <map input="200" output="0"/>
+      <map input="300" output="145"/>
+      <map input="400" output="394"/>
+      <map input="600" output="594"/>
+      <map input="700" output="823"/>
+      <map input="900" output="1000"/>
+    </axis>
+    <axis tag="opsz" name="optical" minimum="8" maximum="60" default="20"/>
+  </axes>
+  <sources>
+    <source filename="../caption/master_0/SourceSerif_c0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../caption/master_1/SourceSerif_c1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../caption/master_2/SourceSerif_c2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../text/master_0/SourceSerif_0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../text/master_1/SourceSerif_1.ufo" familyname="Source Serif 4">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../text/master_2/SourceSerif_2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../display/master_0/SourceSerif_d0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+    <source filename="../display/master_1/SourceSerif_d1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+    <source filename="../display/master_2/SourceSerif_d2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+  </sources>
+  <variable-fonts>
+    <variable-font name="SourceSerif4Variable-Roman">
+      <axis-subsets>
+        <axis-subset name="weight"/>
+        <axis-subset name="optical"/>
+      </axis-subsets>
+      <lib>
+        <dict>
+          <key>public.skipExportGlyphs</key>
+          <array>
+            <string>caron.alt</string>
+            <string>commabelowcmb.alt</string>
+            <string>tonos.cap</string>
+            <string>f.ligalong</string>
+            <string>dieresiscmb.tight</string>
+            <string>IJ</string>
+            <string>Tbar</string>
+            <string>colontriangularmod</string>
+            <string>crossmark</string>
+            <string>ij</string>
+            <string>overline</string>
+            <string>similar</string>
+            <string>tbar</string>
+            <string>triangularbullet</string>
+            <string>turkicdsccmb</string>
+          </array>
+        </dict>
+      </lib>
+    </variable-font>
+  </variable-fonts>
+  <instances>
+    <instance name="Source Serif 4 Caption ExtraLight" familyname="Source Serif 4" stylename="Caption ExtraLight" filename="Source Serif 4-Caption ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-CaptionExtraLight" stylemapfamilyname="Source Serif 4 Caption ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Light" familyname="Source Serif 4" stylename="Caption Light" filename="Source Serif 4-Caption Light.ttf" postscriptfontname="SourceSerif4Roman-CaptionLight" stylemapfamilyname="Source Serif 4 Caption Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption" familyname="Source Serif 4" stylename="Caption" filename="Source Serif 4-Caption.ttf" postscriptfontname="SourceSerif4Roman-CaptionRegular" stylemapfamilyname="Source Serif 4 Caption" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Semibold" familyname="Source Serif 4" stylename="Caption Semibold" filename="Source Serif 4-Caption Semibold.ttf" postscriptfontname="SourceSerif4Roman-CaptionSemibold" stylemapfamilyname="Source Serif 4 Caption Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Bold" familyname="Source Serif 4" stylename="Caption Bold" filename="Source Serif 4-Caption Bold.ttf" postscriptfontname="SourceSerif4Roman-CaptionBold" stylemapfamilyname="Source Serif 4 Caption Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Black" familyname="Source Serif 4" stylename="Caption Black" filename="Source Serif 4-Caption Black.ttf" postscriptfontname="SourceSerif4Roman-CaptionBlack" stylemapfamilyname="Source Serif 4 Caption Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText ExtraLight" familyname="Source Serif 4" stylename="SmText ExtraLight" filename="Source Serif 4-SmText ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-SmTextExtraLight" stylemapfamilyname="Source Serif 4 SmallText ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Light" familyname="Source Serif 4" stylename="SmText Light" filename="Source Serif 4-SmText Light.ttf" postscriptfontname="SourceSerif4Roman-SmTextLight" stylemapfamilyname="Source Serif 4 SmallText Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText" familyname="Source Serif 4" stylename="SmText" filename="Source Serif 4-SmText.ttf" postscriptfontname="SourceSerif4Roman-SmTextRegular" stylemapfamilyname="Source Serif 4 SmallText" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Semibold" familyname="Source Serif 4" stylename="SmText Semibold" filename="Source Serif 4-SmText Semibold.ttf" postscriptfontname="SourceSerif4Roman-SmTextSemibold" stylemapfamilyname="Source Serif 4 SmallText Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Bold" familyname="Source Serif 4" stylename="SmText Bold" filename="Source Serif 4-SmText Bold.ttf" postscriptfontname="SourceSerif4Roman-SmTextBold" stylemapfamilyname="Source Serif 4 SmallText Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Black" familyname="Source Serif 4" stylename="SmText Black" filename="Source Serif 4-SmText Black.ttf" postscriptfontname="SourceSerif4Roman-SmTextBlack" stylemapfamilyname="Source Serif 4 SmallText Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 ExtraLight" familyname="Source Serif 4" stylename="ExtraLight" filename="Source Serif 4-ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-ExtraLight" stylemapfamilyname="Source Serif 4 ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Light" familyname="Source Serif 4" stylename="Light" filename="Source Serif 4-Light.ttf" postscriptfontname="SourceSerif4Roman-Light" stylemapfamilyname="Source Serif 4 Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Regular" familyname="Source Serif 4" stylename="Regular" filename="Source Serif 4-Regular.ttf" postscriptfontname="SourceSerif4Roman-Regular" stylemapfamilyname="Source Serif 4" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Semibold" familyname="Source Serif 4" stylename="Semibold" filename="Source Serif 4-Semibold.ttf" postscriptfontname="SourceSerif4Roman-Semibold" stylemapfamilyname="Source Serif 4 Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Bold" familyname="Source Serif 4" stylename="Bold" filename="Source Serif 4-Bold.ttf" postscriptfontname="SourceSerif4Roman-Bold" stylemapfamilyname="Source Serif 4 Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Black" familyname="Source Serif 4" stylename="Black" filename="Source Serif 4-Black.ttf" postscriptfontname="SourceSerif4Roman-Black" stylemapfamilyname="Source Serif 4 Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead ExtraLight" familyname="Source Serif 4" stylename="Subhead ExtraLight" filename="Source Serif 4-Subhead ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-SubheadExtraLight" stylemapfamilyname="Source Serif 4 Subhead ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Light" familyname="Source Serif 4" stylename="Subhead Light" filename="Source Serif 4-Subhead Light.ttf" postscriptfontname="SourceSerif4Roman-SubheadLight" stylemapfamilyname="Source Serif 4 Subhead Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead" familyname="Source Serif 4" stylename="Subhead" filename="Source Serif 4-Subhead.ttf" postscriptfontname="SourceSerif4Roman-SubheadRegular" stylemapfamilyname="Source Serif 4 Subhead" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Semibold" familyname="Source Serif 4" stylename="Subhead Semibold" filename="Source Serif 4-Subhead Semibold.ttf" postscriptfontname="SourceSerif4Roman-SubheadSemibold" stylemapfamilyname="Source Serif 4 Subhead Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Bold" familyname="Source Serif 4" stylename="Subhead Bold" filename="Source Serif 4-Subhead Bold.ttf" postscriptfontname="SourceSerif4Roman-SubheadBold" stylemapfamilyname="Source Serif 4 Subhead Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Black" familyname="Source Serif 4" stylename="Subhead Black" filename="Source Serif 4-Subhead Black.ttf" postscriptfontname="SourceSerif4Roman-SubheadBlack" stylemapfamilyname="Source Serif 4 Subhead Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display ExtraLight" familyname="Source Serif 4" stylename="Display ExtraLight" filename="Source Serif 4-Display ExtraLight.ttf" postscriptfontname="SourceSerif4Roman-DisplayExtraLight" stylemapfamilyname="Source Serif 4 Display ExtraLight" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Light" familyname="Source Serif 4" stylename="Display Light" filename="Source Serif 4-Display Light.ttf" postscriptfontname="SourceSerif4Roman-DisplayLight" stylemapfamilyname="Source Serif 4 Display Light" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display" familyname="Source Serif 4" stylename="Display" filename="Source Serif 4-Display.ttf" postscriptfontname="SourceSerif4Roman-DisplayRegular" stylemapfamilyname="Source Serif 4 Display" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Semibold" familyname="Source Serif 4" stylename="Display Semibold" filename="Source Serif 4-Display Semibold.ttf" postscriptfontname="SourceSerif4Roman-DisplaySemibold" stylemapfamilyname="Source Serif 4 Display Semibold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Bold" familyname="Source Serif 4" stylename="Display Bold" filename="Source Serif 4-Display Bold.ttf" postscriptfontname="SourceSerif4Roman-DisplayBold" stylemapfamilyname="Source Serif 4 Display Bold" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Black" familyname="Source Serif 4" stylename="Display Black" filename="Source Serif 4-Display Black.ttf" postscriptfontname="SourceSerif4Roman-DisplayBlack" stylemapfamilyname="Source Serif 4 Display Black" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/split_output/test_v5_sourceserif_italic_1.0.designspace

@@ -0,0 +1,274 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="weight" minimum="200" maximum="900" default="400">
+      <map input="200" output="0"/>
+      <map input="300" output="145"/>
+      <map input="400" output="394"/>
+      <map input="600" output="594"/>
+      <map input="700" output="823"/>
+      <map input="900" output="1000"/>
+    </axis>
+    <axis tag="opsz" name="optical" minimum="8" maximum="60" default="20"/>
+  </axes>
+  <sources>
+    <source filename="../caption/master_0/SourceSerif-Italic_c0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../caption/master_1/SourceSerif-Italic_c1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../caption/master_2/SourceSerif-Italic_c2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </source>
+    <source filename="../text/master_0/SourceSerif-Italic_0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../text/master_1/SourceSerif-Italic_1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../text/master_2/SourceSerif-Italic_2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="../display/master_0/SourceSerif-Italic_d0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+    <source filename="../display/master_1/SourceSerif-Italic_d1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+    <source filename="../display/master_2/SourceSerif-Italic_d2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </source>
+  </sources>
+  <variable-fonts>
+    <variable-font name="SourceSerif4Variable-Italic">
+      <axis-subsets>
+        <axis-subset name="weight"/>
+        <axis-subset name="optical"/>
+      </axis-subsets>
+      <lib>
+        <dict>
+          <key>public.skipExportGlyphs</key>
+          <array>
+            <string>caron.alt</string>
+            <string>commabelowcmb.alt</string>
+            <string>f.liga</string>
+            <string>f.ligalong</string>
+            <string>tonos.cap</string>
+            <string>dieresiscmb.tight</string>
+            <string>turkicdsccmb</string>
+          </array>
+        </dict>
+      </lib>
+    </variable-font>
+  </variable-fonts>
+  <instances>
+    <instance name="Source Serif 4 Caption ExtraLight Italic" familyname="Source Serif 4" stylename="Caption ExtraLight Italic" filename="Source Serif 4-Caption ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionExtraLight" stylemapfamilyname="Source Serif 4 Caption ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Light Italic" familyname="Source Serif 4" stylename="Caption Light Italic" filename="Source Serif 4-Caption Light Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionLight" stylemapfamilyname="Source Serif 4 Caption Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Italic" familyname="Source Serif 4" stylename="Caption Italic" filename="Source Serif 4-Caption Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionRegular" stylemapfamilyname="Source Serif 4 Caption Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Semibold Italic" familyname="Source Serif 4" stylename="Caption Semibold Italic" filename="Source Serif 4-Caption Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionSemibold" stylemapfamilyname="Source Serif 4 Caption Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Bold Italic" familyname="Source Serif 4" stylename="Caption Bold Italic" filename="Source Serif 4-Caption Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionBold" stylemapfamilyname="Source Serif 4 Caption Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Caption Black Italic" familyname="Source Serif 4" stylename="Caption Black Italic" filename="Source Serif 4-Caption Black Italic.ttf" postscriptfontname="SourceSerif4Italic-CaptionBlack" stylemapfamilyname="Source Serif 4 Caption Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText ExtraLight Italic" familyname="Source Serif 4" stylename="SmText ExtraLight Italic" filename="Source Serif 4-SmText ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextExtraLight" stylemapfamilyname="Source Serif 4 SmallText ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Light Italic" familyname="Source Serif 4" stylename="SmText Light Italic" filename="Source Serif 4-SmText Light Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextLight" stylemapfamilyname="Source Serif 4 SmallText Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Italic" familyname="Source Serif 4" stylename="SmText Italic" filename="Source Serif 4-SmText Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextRegular" stylemapfamilyname="Source Serif 4 SmallText Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Semibold Italic" familyname="Source Serif 4" stylename="SmText Semibold Italic" filename="Source Serif 4-SmText Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextSemibold" stylemapfamilyname="Source Serif 4 SmallText Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Bold Italic" familyname="Source Serif 4" stylename="SmText Bold Italic" filename="Source Serif 4-SmText Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextBold" stylemapfamilyname="Source Serif 4 SmallText Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 SmText Black Italic" familyname="Source Serif 4" stylename="SmText Black Italic" filename="Source Serif 4-SmText Black Italic.ttf" postscriptfontname="SourceSerif4Italic-SmTextBlack" stylemapfamilyname="Source Serif 4 SmallText Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="16"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 ExtraLight Italic" familyname="Source Serif 4" stylename="ExtraLight Italic" filename="Source Serif 4-ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-ExtraLight" stylemapfamilyname="Source Serif 4 ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Light Italic" familyname="Source Serif 4" stylename="Light Italic" filename="Source Serif 4-Light Italic.ttf" postscriptfontname="SourceSerif4Italic-Light" stylemapfamilyname="Source Serif 4 Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Italic" familyname="Source Serif 4" stylename="Italic" filename="Source Serif 4-Italic.ttf" postscriptfontname="SourceSerif4Italic-Regular" stylemapfamilyname="Source Serif 4 Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Semibold Italic" familyname="Source Serif 4" stylename="Semibold Italic" filename="Source Serif 4-Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-Semibold" stylemapfamilyname="Source Serif 4 Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Bold Italic" familyname="Source Serif 4" stylename="Bold Italic" filename="Source Serif 4-Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-Bold" stylemapfamilyname="Source Serif 4 Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Black Italic" familyname="Source Serif 4" stylename="Black Italic" filename="Source Serif 4-Black Italic.ttf" postscriptfontname="SourceSerif4Italic-Black" stylemapfamilyname="Source Serif 4 Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead ExtraLight Italic" familyname="Source Serif 4" stylename="Subhead ExtraLight Italic" filename="Source Serif 4-Subhead ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadExtraLight" stylemapfamilyname="Source Serif 4 Subhead ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Light Italic" familyname="Source Serif 4" stylename="Subhead Light Italic" filename="Source Serif 4-Subhead Light Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadLight" stylemapfamilyname="Source Serif 4 Subhead Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Italic" familyname="Source Serif 4" stylename="Subhead Italic" filename="Source Serif 4-Subhead Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadRegular" stylemapfamilyname="Source Serif 4 Subhead Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Semibold Italic" familyname="Source Serif 4" stylename="Subhead Semibold Italic" filename="Source Serif 4-Subhead Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadSemibold" stylemapfamilyname="Source Serif 4 Subhead Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Bold Italic" familyname="Source Serif 4" stylename="Subhead Bold Italic" filename="Source Serif 4-Subhead Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadBold" stylemapfamilyname="Source Serif 4 Subhead Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Subhead Black Italic" familyname="Source Serif 4" stylename="Subhead Black Italic" filename="Source Serif 4-Subhead Black Italic.ttf" postscriptfontname="SourceSerif4Italic-SubheadBlack" stylemapfamilyname="Source Serif 4 Subhead Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="32"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display ExtraLight Italic" familyname="Source Serif 4" stylename="Display ExtraLight Italic" filename="Source Serif 4-Display ExtraLight Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayExtraLight" stylemapfamilyname="Source Serif 4 Display ExtraLight Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Light Italic" familyname="Source Serif 4" stylename="Display Light Italic" filename="Source Serif 4-Display Light Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayLight" stylemapfamilyname="Source Serif 4 Display Light Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Italic" familyname="Source Serif 4" stylename="Display Italic" filename="Source Serif 4-Display Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayRegular" stylemapfamilyname="Source Serif 4 Display Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Semibold Italic" familyname="Source Serif 4" stylename="Display Semibold Italic" filename="Source Serif 4-Display Semibold Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplaySemibold" stylemapfamilyname="Source Serif 4 Display Semibold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Bold Italic" familyname="Source Serif 4" stylename="Display Bold Italic" filename="Source Serif 4-Display Bold Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayBold" stylemapfamilyname="Source Serif 4 Display Bold Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+    <instance name="Source Serif 4 Display Black Italic" familyname="Source Serif 4" stylename="Display Black Italic" filename="Source Serif 4-Display Black Italic.ttf" postscriptfontname="SourceSerif4Italic-DisplayBlack" stylemapfamilyname="Source Serif 4 Display Black Italic" stylemapstylename="regular">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/test_v4_original.designspace

@@ -1,5 +1,7 @@
 <?xml version='1.0' encoding='UTF-8'?>
 <designspace format="4.1">
+  <!-- NOTE: this file is kept at format 4, to check that round-tripping it
+       doesn't upgrade the format. -->
   <axes>
     <axis tag="wght" name="weight" minimum="0" maximum="1000" default="0">
       <labelname xml:lang="en">Wéíght</labelname>
@@ -50,6 +52,13 @@
   </sources>
   <instances>
     <instance name="instance.ufo1" familyname="InstanceFamilyName" stylename="InstanceStyleName" filename="instances/instanceTest1.ufo" postscriptfontname="InstancePostscriptName" stylemapfamilyname="InstanceStyleMapFamilyName" stylemapstylename="InstanceStyleMapStyleName">
+      <stylename xml:lang="fr">Demigras</stylename>
+      <stylename xml:lang="ja">半ば</stylename>
+      <familyname xml:lang="fr">Montserrat</familyname>
+      <familyname xml:lang="ja">モンセラート</familyname>
+      <stylemapstylename xml:lang="de">Standard</stylemapstylename>
+      <stylemapfamilyname xml:lang="de">Montserrat Halbfett</stylemapfamilyname>
+      <stylemapfamilyname xml:lang="ja">モンセラート SemiBold</stylemapfamilyname>
       <location>
         <dimension name="weight" xvalue="500"/>
         <dimension name="width" xvalue="20"/>

Tests/designspaceLib/data/test_v5.designspace

@@ -0,0 +1,294 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes elidedfallbackname="Regular">
+    <axis tag="wght" name="weight" minimum="200" maximum="1000" default="200">
+      <labelname xml:lang="en">Wéíght</labelname>
+      <labelname xml:lang="fa-IR">قطر</labelname>
+      <map input="200" output="0"/>
+      <map input="300" output="100"/>
+      <map input="400" output="368"/>
+      <map input="600" output="600"/>
+      <map input="700" output="824"/>
+      <map input="900" output="1000"/>
+      <!-- All axes provide STAT information with the "labels" element. -->
+      <labels>
+        <label uservalue="200" userminimum="200" usermaximum="250" name="Extra Light">
+          <labelname xml:lang="de">Extraleicht</labelname>
+          <labelname xml:lang="fr">Extra léger</labelname>
+        </label>
+        <label uservalue="300" userminimum="250" usermaximum="350" name="Light"/>
+        <label uservalue="400" userminimum="350" usermaximum="450" name="Regular" elidable="true"/>
+        <label uservalue="600" userminimum="450" usermaximum="650" name="Semi Bold"/>
+        <label uservalue="700" userminimum="650" usermaximum="850" name="Bold"/>
+        <label uservalue="900" userminimum="850" usermaximum="900" name="Black"/>
+      </labels>
+    </axis>
+
+    <axis tag="wdth" name="width" minimum="50" maximum="150" default="100" hidden="1">
+      <labelname xml:lang="fr">Chasse</labelname>
+      <map input="50" output="10"/>
+      <map input="100" output="20"/>
+      <map input="125" output="66"/>
+      <map input="150" output="990"/>
+      <labels ordering="1">
+        <label uservalue="50" name="Condensed"/>
+        <label uservalue="100" name="Normal" elidable="true" oldersibling="true"/>
+        <label uservalue="125" name="Wide"/>
+        <!-- Allow specifying only one end of the range, the other is assumed to
+          be infinity as does otlLib buildStatTable -->
+        <label uservalue="150" userminimum="150" name="Extra Wide"/>
+      </labels>
+    </axis>
+
+    <!--
+      Discrete axes provide a list of discrete values.
+      No interpolation is allowed between these.
+    -->
+    <axis tag="ital" name="Italic" values="0 1" default="0">
+      <labels>
+        <!-- Discrete axes also provide STAT information. -->
+        <label uservalue="0" name="Roman" elidable="true" linkeduservalue="1"/>
+        <label uservalue="1" name="Italic"/>
+      </labels>
+    </axis>
+  </axes>
+
+  <!-- Freestanding labels are analogues of STAT format 4 entries.
+        They give names to freestyle locations. -->
+  <labels>
+    <label name="Some Style">
+      <labelname xml:lang="fr">Un Style</labelname>
+      <location>
+        <dimension name="weight" uservalue="300"/>
+        <dimension name="width" uservalue="50"/>
+        <dimension name="Italic" uservalue="0"/>
+      </location>
+    </label>
+    <label name="Other">
+      <location>
+        <dimension name="weight" uservalue="700"/>
+        <dimension name="width" uservalue="100"/>
+        <dimension name="Italic" uservalue="1"/>
+      </location>
+    </label>
+  </labels>
+
+  <rules processing="last">
+    <rule name="named.rule.1">
+      <conditionset>
+        <condition name="axisName_a" minimum="0" maximum="1"/>
+        <condition name="axisName_b" minimum="2" maximum="3"/>
+      </conditionset>
+      <sub name="a" with="a.alt"/>
+    </rule>
+  </rules>
+
+  <sources>
+    <source filename="masters/masterTest1.ufo" name="master.ufo1" familyname="MasterFamilyName" stylename="MasterStyleNameOne">
+      <familyname xml:lang="fr">Montserrat</familyname>
+      <familyname xml:lang="ja">モンセラート</familyname>
+      <lib copy="1"/>
+      <features copy="1"/>
+      <info copy="1"/>
+      <glyph name="A" mute="1"/>
+      <glyph name="Z" mute="1"/>
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="width" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="masters/masterTest2.ufo" name="master.ufo2" familyname="MasterFamilyName" stylename="MasterStyleNameTwo">
+      <kerning mute="1"/>
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="width" xvalue="20"/>
+      </location>
+    </source>
+    <source filename="masters/masterTest2.ufo" name="master.ufo2" familyname="MasterFamilyName" stylename="Supports" layer="supports">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="width" xvalue="20"/>
+      </location>
+    </source>
+  </sources>
+
+  <variable-fonts>
+    <!--
+      If this element is present, all output targets must be listed within it.
+      If it is not present, the full Designspace is the output, like in version 4.x.
+
+      Continuous axes can be included either:
+        * in full,
+        * or only on a reduced interval (different minimum-maximum),
+        * or only at 1 discrete location
+      Dicrete axes cannot be included in full, and we must specify a value
+      (or the compiler should assume the default value).
+    -->
+    <variable-font name="Test_WghtWdth" filename="Test_WghtWdth_different_from_name.ttf">
+      <!-- This one is the Roman (default location along ital),
+           with full range for the Weight axis. -->
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+        <axis-subset name="Width"/>
+      </axis-subsets>
+      <lib>
+        <dict>
+          <key>com.vtt.source</key>
+          <string>sources/vtt/Test_WghtWdth.vtt</string>
+        </dict>
+      </lib>
+    </variable-font>
+    <variable-font name="Test_Wght">
+      <!-- This one is the Roman (default location along ital),
+           with full range for the Weight axis. -->
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+      </axis-subsets>
+      <lib>
+        <dict>
+          <key>com.vtt.source</key>
+          <string>sources/vtt/Test_Wght.vtt</string>
+        </dict>
+      </lib>
+    </variable-font>
+    <variable-font name="TestCd_Wght">
+      <!-- This one is the Roman (default location along ital),
+           with full range for the Weight axis. -->
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+        <axis-subset name="Width" uservalue="0"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="TestWd_Wght">
+      <!-- This one is the Roman (default location along ital),
+           with full range for the Weight axis. -->
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+        <axis-subset name="Width" uservalue="1000"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="TestItalic_Wght">
+      <!-- This one is the Italic, with full range for the Weight axis. -->
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+        <axis-subset name="Italic" uservalue="1"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="TestRB_Wght">
+      <!-- As an example, this would be the Roman with a reduced range. -->
+      <axis-subsets>
+        <axis-subset name="Weight" userminimum="400" usermaximum="700" userdefault="400"/>
+        <axis-subset name="Italic" uservalue="0"/>
+      </axis-subsets>
+    </variable-font>
+  </variable-fonts>
+
+  <instances>
+    <instance name="instance.ufo1" familyname="InstanceFamilyName" stylename="InstanceStyleName" filename="instances/instanceTest1.ufo" postscriptfontname="InstancePostscriptName" stylemapfamilyname="InstanceStyleMapFamilyName" stylemapstylename="InstanceStyleMapStyleName">
+      <stylename xml:lang="fr">Demigras</stylename>
+      <stylename xml:lang="ja">半ば</stylename>
+      <familyname xml:lang="fr">Montserrat</familyname>
+      <familyname xml:lang="ja">モンセラート</familyname>
+      <stylemapstylename xml:lang="de">Standard</stylemapstylename>
+      <stylemapfamilyname xml:lang="de">Montserrat Halbfett</stylemapfamilyname>
+      <stylemapfamilyname xml:lang="ja">モンセラート SemiBold</stylemapfamilyname>
+      <location>
+        <dimension name="weight" xvalue="500"/>
+        <dimension name="width" xvalue="20"/>
+      </location>
+
+      <!-- The following elements are deprecated in v5.0. They can still be
+           read, but they won't be written out again (they don't roundtrip). -->
+      <!-- ROUNDTRIP_TEST_REMOVE_ME_BEGIN -->
+      <glyphs>
+        <glyph mute="1" unicode="0x123 0x124 0x125" name="arrow"/>
+      </glyphs>
+      <kerning/>
+      <info/>
+      <!-- ROUNDTRIP_TEST_REMOVE_ME_END -->
+
+      <lib>
+        <dict>
+          <key>com.coolDesignspaceApp.binaryData</key>
+          <data>
+          PGJpbmFyeSBndW5rPg==
+          </data>
+          <key>com.coolDesignspaceApp.specimenText</key>
+          <string>Hamburgerwhatever</string>
+        </dict>
+      </lib>
+    </instance>
+    <instance name="instance.ufo2" familyname="InstanceFamilyName" stylename="InstanceStyleName" filename="instances/instanceTest2.ufo" postscriptfontname="InstancePostscriptName" stylemapfamilyname="InstanceStyleMapFamilyName" stylemapstylename="InstanceStyleMapStyleName">
+      <location>
+        <dimension name="weight" xvalue="500"/>
+        <dimension name="width" xvalue="400" yvalue="300"/>
+      </location>
+      <!-- ROUNDTRIP_TEST_REMOVE_ME_BEGIN -->
+      <glyphs>
+        <glyph unicode="0x65 0xc9 0x12d" name="arrow">
+          <location>
+            <dimension name="weight" xvalue="120"/>
+            <dimension name="width" xvalue="100"/>
+          </location>
+          <note>A note about this glyph</note>
+          <masters>
+            <master glyphname="BB" source="master.ufo1">
+              <location>
+                <dimension name="weight" xvalue="20"/>
+                <dimension name="width" xvalue="20"/>
+              </location>
+            </master>
+            <master glyphname="CC" source="master.ufo2">
+              <location>
+                <dimension name="weight" xvalue="900"/>
+                <dimension name="width" xvalue="900"/>
+              </location>
+            </master>
+          </masters>
+        </glyph>
+        <glyph name="arrow2"/>
+      </glyphs>
+      <kerning/>
+      <info/>
+      <!-- ROUNDTRIP_TEST_REMOVE_ME_END -->
+    </instance>
+
+    <!--
+      These instances will derive all their data from the data above.
+
+      Instances can specify their location either:
+        - using the name of a location label
+        - with design coordinates (xvalue="")
+        - with user coordinates (uservalue="")
+        - with a mix of both coordinate systems
+    -->
+    <instance location="asdf"/>
+    <instance>
+      <location>
+        <dimension name="weight" xvalue="600"/>
+        <dimension name="width" xvalue="401" yvalue="420"/>
+      </location>
+    </instance>
+    <instance>
+      <location>
+        <dimension name="weight" xvalue="10"/>
+        <dimension name="width" uservalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance>
+      <location>
+        <dimension name="weight" uservalue="300"/>
+        <dimension name="width" uservalue="130"/>
+        <dimension name="Italic" uservalue="1"/>
+      </location>
+    </instance>
+  </instances>
+
+  <lib>
+    <dict>
+      <key>com.coolDesignspaceApp.previewSize</key>
+      <integer>30</integer>
+    </dict>
+  </lib>
+</designspace>

Tests/designspaceLib/data/test_v5_MutatorSans_and_Serif.designspace

@@ -0,0 +1,206 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes elidedfallbackname="Regular">
+    <axis tag="SRIF" name="serif" values="0 1" default="0">
+      <labels>
+        <label uservalue="0" name="Sans"/>
+        <label uservalue="1" name="Serif"/>
+      </labels>
+    </axis>
+    <axis tag="wght" name="weight" minimum="300" maximum="700" default="300">
+      <map input="300" output="0"/>
+      <map input="500" output="500"/>
+      <map input="700" output="1000"/>
+      <labels>
+        <label uservalue="300" userminimum="300" usermaximum="400" name="Light"/>
+        <label uservalue="500" userminimum="400" usermaximum="600" name="Medium"/>
+        <label uservalue="700" userminimum="600" usermaximum="700" name="Bold"/>
+      </labels>
+    </axis>
+    <axis tag="wdth" name="width" minimum="50" maximum="200" default="50">
+      <map input="50" output="0"/>
+      <map input="100" output="500"/>
+      <map input="200" output="1000"/>
+      <labels>
+        <label uservalue="50" userminimum="50" usermaximum="75" name="Condensed"/>
+        <label uservalue="100" userminimum="75" usermaximum="125" name="Normal" elidable="true"/>
+        <label uservalue="200" userminimum="125" usermaximum="200" name="Extended"/>
+      </labels>
+    </axis>
+  </axes>
+  <labels>
+    <label name="S1">
+      <location>
+        <dimension name="width" uservalue="158.9044"/>
+        <dimension name="weight" uservalue="610.2436"/>
+      </location>
+    </label>
+    <label name="S2">
+      <location>
+        <dimension name="width" uservalue="159.1956"/>
+        <dimension name="weight" uservalue="642.2196"/>
+      </location>
+    </label>
+  </labels>
+  <rules>
+    <rule name="fold_I_serifs">
+      <conditionset>
+        <condition name="width" minimum="0" maximum="328"/>
+        <condition name="serif" minimum="0" maximum="0"/>
+      </conditionset>
+      <sub name="I" with="I.narrow"/>
+    </rule>
+    <rule name="fold_S_terminals">
+      <conditionset>
+        <condition name="width" minimum="0" maximum="1000"/>
+        <condition name="weight" minimum="0" maximum="500"/>
+        <condition name="serif" minimum="0" maximum="0.5"/>
+      </conditionset>
+      <sub name="S" with="S.closed"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="MutatorSansLightCondensed.ufo" name="master.MutatorMathTest.LightCondensed.0" familyname="MutatorMathTest" stylename="LightCondensed">
+      <location>
+        <dimension name="width" xvalue="0"/>
+        <dimension name="weight" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="MutatorSansBoldCondensed.ufo" name="master.MutatorMathTest.BoldCondensed.1" familyname="MutatorMathTest" stylename="BoldCondensed">
+      <location>
+        <dimension name="width" xvalue="0"/>
+        <dimension name="weight" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="MutatorSansLightWide.ufo" name="master.MutatorMathTest.LightWide.2" familyname="MutatorMathTest" stylename="LightWide">
+      <location>
+        <dimension name="width" xvalue="1000"/>
+        <dimension name="weight" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="MutatorSansBoldWide.ufo" name="master.MutatorMathTest.BoldWide.3" familyname="MutatorMathTest" stylename="BoldWide">
+      <location>
+        <dimension name="width" xvalue="1000"/>
+        <dimension name="weight" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="MutatorSansLightCondensed.ufo" name="support.crossbar" layer="support.crossbar">
+      <location>
+        <dimension name="width" xvalue="0"/>
+        <dimension name="weight" xvalue="700"/>
+      </location>
+    </source>
+    <source filename="MutatorSansLightCondensed.ufo" name="support.S.wide" layer="support.S.wide">
+      <location>
+        <dimension name="width" xvalue="1000"/>
+        <dimension name="weight" xvalue="700"/>
+      </location>
+    </source>
+    <source filename="MutatorSansLightCondensed.ufo" name="support.S.middle" layer="support.S.middle">
+      <location>
+        <dimension name="width" xvalue="569.078000"/>
+        <dimension name="weight" xvalue="700"/>
+      </location>
+    </source>
+    <source filename="MutatorSerifLightCondensed.ufo" familyname="MutatorMathTest" stylename="SerifLightCondensed">
+      <location>
+        <dimension name="width" xvalue="0"/>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="serif" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="MutatorSerifLightWide.ufo" familyname="MutatorMathTest" stylename="SerifLightWide">
+      <location>
+        <dimension name="width" xvalue="1000"/>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="serif" xvalue="1"/>
+      </location>
+    </source>
+  </sources>
+  <variable-fonts>
+    <variable-font name="MutatorSansVariable_Weight_Width">
+      <axis-subsets>
+        <axis-subset name="weight"/>
+        <axis-subset name="width"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="MutatorSansVariable_Weight">
+      <axis-subsets>
+        <axis-subset name="weight"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="MutatorSansVariable_Width">
+      <axis-subsets>
+        <axis-subset name="width"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="MutatorSerifVariable_Width">
+      <axis-subsets>
+        <axis-subset name="serif" uservalue="1"/>
+        <axis-subset name="width"/>
+      </axis-subsets>
+    </variable-font>
+  </variable-fonts>
+  <instances>
+    <instance>
+      <location>
+        <dimension name="width" xvalue="0"/>
+        <dimension name="weight" xvalue="0"/>
+      </location>
+    </instance>
+    <instance>
+      <location>
+        <dimension name="width" xvalue="0"/>
+        <dimension name="weight" xvalue="1000"/>
+      </location>
+    </instance>
+    <instance>
+      <location>
+        <dimension name="width" xvalue="1000"/>
+        <dimension name="weight" xvalue="0"/>
+      </location>
+    </instance>
+    <instance>
+      <location>
+        <dimension name="width" xvalue="1000"/>
+        <dimension name="weight" xvalue="1000"/>
+      </location>
+    </instance>
+    <instance>
+      <location>
+        <dimension name="width" xvalue="327"/>
+        <dimension name="weight" xvalue="500"/>
+      </location>
+    </instance>
+    <instance>
+      <location>
+        <dimension name="width" xvalue="327"/>
+        <dimension name="weight" xvalue="500"/>
+      </location>
+    </instance>
+    <instance>
+      <location>
+        <dimension name="width" xvalue="569.078"/>
+        <dimension name="weight" xvalue="1000"/>
+      </location>
+    </instance>
+    <instance>
+      <location>
+        <dimension name="width" xvalue="1000"/>
+        <dimension name="weight" xvalue="500"/>
+      </location>
+    </instance>
+    <instance>
+      <location>
+        <dimension name="width" xvalue="0"/>
+        <dimension name="serif" xvalue="0"/>
+      </location>
+    </instance>
+    <instance>
+      <location>
+        <dimension name="width" xvalue="0"/>
+        <dimension name="serif" xvalue="1"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/test_v5_aktiv.designspace

@@ -0,0 +1,621 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="Weight" minimum="100" maximum="900" default="400">
+      <map input="100" output="22"/>
+      <map input="200" output="38"/>
+      <map input="300" output="57"/>
+      <map input="400" output="84"/>
+      <map input="500" output="98"/>
+      <map input="600" output="115"/>
+      <map input="700" output="133"/>
+      <map input="800" output="158"/>
+      <map input="900" output="185"/>
+      <labels ordering="1">
+        <label uservalue="100" name="Hair"/>
+        <label uservalue="200" name="Thin"/>
+        <label uservalue="300" name="Light"/>
+        <label uservalue="400" name="Regular" elidable="true" linkeduservalue="700"/>
+        <label uservalue="500" name="Medium"/>
+        <label uservalue="600" name="SemiBold"/>
+        <label uservalue="700" name="Bold"/>
+        <label uservalue="800" name="XBold"/>
+        <label uservalue="900" name="Black"/>
+      </labels>
+    </axis>
+    <axis tag="wdth" name="Width" minimum="75" maximum="125" default="100">
+      <labels ordering="0">
+        <label uservalue="75" name="Cd"/>
+        <label uservalue="100" name="Normal" elidable="true"/>
+        <label uservalue="125" name="Ex"/>
+      </labels>
+    </axis>
+    <axis tag="ital" name="Italic" minimum="0" maximum="1" default="0">
+      <labels ordering="2">
+        <label uservalue="0" name="Upright" elidable="true" linkeduservalue="1"/>
+        <label uservalue="1" name="Italic"/>
+      </labels>
+    </axis>
+  </axes>
+
+  <rules processing="last">
+    <rule name="BRACKET.CYR">
+      <conditionset>
+        <condition name="Italic" minimum="0.1" maximum="1"/>
+      </conditionset>
+      <sub name="ghe.loclSRB" with="ghe.ital.loclSRB"/>
+      <sub name="ghe.loclMKD" with="ghe.ital.loclMKD"/>
+      <sub name="de.loclMKDSRB" with="de.ital.loclMKDSRB"/>
+      <sub name="pe.loclMKDSRB" with="pe.ital.loclMKDSRB"/>
+      <sub name="te.loclMKDSRB" with="te.ital.loclMKDSRB"/>
+      <sub name="gje.loclMKD" with="gje.ital.loclMKD"/>
+      <sub name="sha.loclMKDSRB" with="sha.ital.loclMKDSRB"/>
+    </rule>
+    <rule name="BRACKET.116.185">
+      <conditionset>
+        <condition name="Weight" minimum="116" maximum="185"/>
+        <condition name="Width" minimum="75" maximum="97.5"/>
+      </conditionset>
+      <sub name="cent" with="cent.BRACKET.130"/>
+      <sub name="dollar" with="dollar.BRACKET.130"/>
+    </rule>
+  </rules>
+
+  <sources>
+    <source filename="AktivGroteskCd_Hair.ufo" name="Aktiv Grotesk Cd Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="AktivGroteskCd_HairIt.ufo" name="Aktiv Grotesk Cd Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="AktivGrotesk_Hair.ufo" name="Aktiv Grotesk Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="AktivGrotesk_HairIt.ufo" name="Aktiv Grotesk Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="AktivGroteskEx_Hair.ufo" name="Aktiv Grotesk Ex Hair">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="AktivGroteskEx_HairIt.ufo" name="Aktiv Grotesk Ex Hair Italic">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="AktivGroteskCd_Rg.ufo" name="Aktiv Grotesk Cd">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="AktivGroteskCd_It.ufo" name="Aktiv Grotesk Cd Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" familyname="Aktiv Grotesk">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="AktivGrotesk_Rg.ufo" name="Aktiv Grotesk Regular" layer="{126,100,0}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="AktivGrotesk_It.ufo" name="Aktiv Grotesk Italic {126,100,1}" layer="{126,100,1}">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="AktivGroteskEx_Rg.ufo" name="Aktiv Grotesk Ex">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="AktivGroteskEx_It.ufo" name="Aktiv Grotesk Ex Italic">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="AktivGroteskCd_Blk.ufo" name="Aktiv Grotesk Cd Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="AktivGroteskCd_BlkIt.ufo" name="Aktiv Grotesk Cd Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="AktivGrotesk_Blk.ufo" name="Aktiv Grotesk Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="AktivGrotesk_BlkIt.ufo" name="Aktiv Grotesk Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="AktivGroteskEx_Blk.ufo" name="Aktiv Grotesk Ex Black">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="AktivGroteskEx_BlkIt.ufo" name="Aktiv Grotesk Ex Black Italic">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+  </sources>
+
+  <variable-fonts>
+    <variable-font name="AktivGroteskVF_WghtWdthItal">
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+        <axis-subset name="Width"/>
+        <axis-subset name="Italic"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="AktivGroteskVF_WghtWdth">
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+        <axis-subset name="Width"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="AktivGroteskVF_Wght">
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="AktivGroteskVF_Italics_WghtWdth">
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+        <axis-subset name="Width"/>
+        <axis-subset name="Italic" uservalue="1"/>
+      </axis-subsets>
+    </variable-font>
+    <variable-font name="AktivGroteskVF_Italics_Wght">
+      <axis-subsets>
+        <axis-subset name="Weight"/>
+        <axis-subset name="Italic" uservalue="1"/>
+      </axis-subsets>
+    </variable-font>
+  </variable-fonts>
+
+  <instances>
+    <instance filename="instances/AktivGroteskCd_Hair.ufo">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_HairIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_Hair.ufo">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_HairIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_Hair.ufo">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_HairIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="22"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_Th.ufo">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_ThIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_Th.ufo">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_ThIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_Th.ufo">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_ThIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="38"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_Lt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_LtIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_Lt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_LtIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_Lt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_LtIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="57"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_Rg.ufo">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_It.ufo">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_Rg.ufo">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_It.ufo">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_Rg.ufo">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_It.ufo">
+      <location>
+        <dimension name="Weight" xvalue="84"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_Md.ufo">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_MdIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_Md.ufo">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_MdIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_Md.ufo">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_MdIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="98"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="../build/instances/AktivGroteskCd_SBd.ufo">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="../build/instances/AktivGroteskCd_SBdIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="../build/instances/AktivGrotesk_SBd.ufo">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="../build/instances/AktivGrotesk_SBdIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="../build/instances/AktivGroteskEx_SBd.ufo">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="../build/instances/AktivGroteskEx_SBdIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="115"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_Bd.ufo">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_BdIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_Bd.ufo">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_BdIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_Bd.ufo">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_BdIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="133"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_XBd.ufo">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_XBdIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_XBd.ufo">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_XBdIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_XBd.ufo">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_XBdIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="158"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_Blk.ufo">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskCd_BlkIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_Blk.ufo">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGrotesk_BlkIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="100"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_Blk.ufo">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance filename="instances/AktivGroteskEx_BlkIt.ufo">
+      <location>
+        <dimension name="Weight" xvalue="185"/>
+        <dimension name="Width" xvalue="125"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/test_v5_decovar.designspace

@@ -0,0 +1,242 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="BLDA" name="Inline" minimum="0" maximum="1000" default="0"/>
+    <axis tag="TRMD" name="Shearded" minimum="0" maximum="1000" default="0"/>
+    <axis tag="TRMC" name="Rounded Slab" minimum="0" maximum="1000" default="0"/>
+    <axis tag="SKLD" name="Stripes" minimum="0" maximum="1000" default="0"/>
+    <axis tag="TRML" name="Worm Terminal" minimum="0" maximum="1000" default="0"/>
+    <axis tag="SKLA" name="Inline Skeleton" minimum="0" maximum="1000" default="0"/>
+    <axis tag="TRMF" name="Open Inline Terminal" minimum="0" maximum="1000" default="0"/>
+    <axis tag="TRMK" name="Inline Terminal" minimum="0" maximum="1000" default="0"/>
+    <axis tag="BLDB" name="Worm" minimum="0" maximum="1000" default="0"/>
+    <axis tag="WMX2" name="Weight" minimum="0" maximum="1000" default="0"/>
+    <axis tag="TRMB" name="Flared" minimum="0" maximum="1000" default="0"/>
+    <axis tag="TRMA" name="Rounded" minimum="0" maximum="1000" default="0"/>
+    <axis tag="SKLB" name="Worm Skeleton" minimum="0" maximum="1000" default="0"/>
+    <axis tag="TRMG" name="Slab" minimum="0" maximum="1000" default="0"/>
+    <axis tag="TRME" name="Bifurcated" minimum="0" maximum="1000" default="0"/>
+  </axes>
+
+  <!-- Labels without location or just partly specified location are at the default location plus the explicitly given sub-locations. -->
+  <labels>
+    <label name="Default" elidable="true"/>
+    <label name="Open">
+      <labelname xml:lang="de">Offen</labelname>
+      <location>
+        <dimension name="Inline" uservalue="1000"/>
+      </location>
+    </label>
+    <label name="Worm">
+      <location>
+        <dimension name="Worm" uservalue="1000"/>
+      </location>
+    </label>
+    <label name="Checkered">
+      <location>
+        <dimension name="Inline Skeleton" uservalue="1000"/>
+      </location>
+    </label>
+    <label name="Checkered Reverse">
+      <location>
+        <dimension name="Inline Terminal" uservalue="1000"/>
+      </location>
+    </label>
+    <label name="Striped">
+      <location>
+        <dimension name="Stripes" uservalue="500"/>
+      </location>
+    </label>
+    <label name="Rounded">
+      <location>
+        <dimension name="Rounded" uservalue="1000"/>
+      </location>
+    </label>
+    <label name="Flared">
+      <location>
+        <dimension name="Flared" uservalue="1000"/>
+      </location>
+    </label>
+    <label name="Flared Open">
+      <location>
+        <dimension name="Inline Skeleton" uservalue="1000"/>
+        <dimension name="Flared" uservalue="1000"/>
+      </location>
+    </label>
+    <label name="Rounded Slab">
+      <location>
+        <dimension name="Rounded Slab" uservalue="1000"/>
+      </location>
+    </label>
+    <label name="Sheared">
+      <location>
+        <dimension name="Shearded" uservalue="1000"/>
+      </location>
+    </label>
+    <label name="Bifurcated">
+      <location>
+        <dimension name="Bifurcated" uservalue="1000"/>
+      </location>
+    </label>
+    <label name="Inline">
+      <location>
+        <dimension name="Inline Skeleton" uservalue="500"/>
+        <dimension name="Open Inline Terminal" uservalue="500"/>
+      </location>
+    </label>
+    <label name="Slab">
+      <location>
+        <dimension name="Slab" uservalue="1000"/>
+      </location>
+    </label>
+    <label name="Contrast">
+      <location>
+        <dimension name="Weight" uservalue="1000"/>
+      </location>
+    </label>
+    <label name="Fancy">
+      <location>
+        <dimension name="Inline Skeleton" uservalue="1000"/>
+        <dimension name="Weight" uservalue="1000"/>
+        <dimension name="Flared" uservalue="1000"/>
+      </location>
+    </label>
+    <label name="Mayhem">
+      <location>
+        <dimension name="Rounded Slab" uservalue="750"/>
+        <dimension name="Worm Terminal" uservalue="250"/>
+        <dimension name="Inline Skeleton" uservalue="1000"/>
+        <dimension name="Open Inline Terminal" uservalue="250"/>
+        <dimension name="Inline Terminal" uservalue="250"/>
+        <dimension name="Worm" uservalue="1000"/>
+        <dimension name="Weight" uservalue="750"/>
+        <dimension name="Flared" uservalue="500"/>
+        <dimension name="Rounded" uservalue="500"/>
+        <dimension name="Worm Skeleton" uservalue="1000"/>
+        <dimension name="Slab" uservalue="750"/>
+        <dimension name="Bifurcated" uservalue="500"/>
+      </location>
+    </label>
+  </labels>
+
+  <sources>
+    <source filename="DecovarAlpha-Regular24.ufo" name="master_Regular"/>
+    <source filename="DecovarAlpha-Regular24SkelA.ufo" name="master_sklA">
+      <location>
+        <dimension name="Inline Skeleton" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24SkelD2.ufo" name="master_sklD2">
+      <location>
+        <dimension name="Stripes" xvalue="500"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24SkelD4.ufo" name="master_sklD4">
+      <location>
+        <dimension name="Stripes" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24SkelB2.ufo" name="master_sklB2">
+      <location>
+        <dimension name="Worm Skeleton" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24TermA.ufo" name="master_trmA">
+      <location>
+        <dimension name="Rounded" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24TermB.ufo" name="master_trmB">
+      <location>
+        <dimension name="Flared" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24TermC.ufo" name="master_trmC">
+      <location>
+        <dimension name="Rounded Slab" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24TermD.ufo" name="master_trmD">
+      <location>
+        <dimension name="Shearded" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24TermE.ufo" name="master_trmE">
+      <location>
+        <dimension name="Bifurcated" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24TermF.ufo" name="master_trmF">
+      <location>
+        <dimension name="Open Inline Terminal" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24TermG.ufo" name="master_trmG">
+      <location>
+        <dimension name="Slab" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24TermSkelA.ufo" name="master_trmK">
+      <location>
+        <dimension name="Inline Terminal" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24TermSkelB.ufo" name="master_trmL">
+      <location>
+        <dimension name="Worm Terminal" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24WeightMax1.ufo" name="master_wmx1">
+      <location>
+        <dimension name="Weight" xvalue="5"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24WeightMax1.5.ufo" name="master_wmx1.5">
+      <location>
+        <dimension name="Weight" xvalue="507.806"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24WeightMax2.ufo" name="master_wmx2">
+      <location>
+        <dimension name="Weight" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24bldA.ufo" name="master_bldA">
+      <location>
+        <dimension name="Inline" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="DecovarAlpha-Regular24bldB.ufo" name="master_bldB">
+      <location>
+        <dimension name="Worm" xvalue="1000"/>
+      </location>
+    </source>
+  </sources>
+
+  <instances>
+    <!--
+      This designspace defines LocationLabels (STAT format 4) for various
+      points within the design space. In order to define instances at these
+      locations, DS version 5 provides the `location="..."` attribute which
+      means that the instance is in the same location as the LocationLabel
+      with the given name.
+    -->
+    <instance location="Default" filename="DecovarAlpha-Default.ufo"/>
+    <instance location="Open" filename="DecovarAlpha-Open.ufo"/>
+    <instance location="Worm" filename="DecovarAlpha-Worm.ufo"/>
+    <instance location="Checkered" filename="DecovarAlpha-Checkered.ufo"/>
+    <instance location="Checkered Reverse" filename="DecovarAlpha-CheckeredReverse.ufo"/>
+    <instance location="Striped" filename="DecovarAlpha-Striped.ufo"/>
+    <instance location="Rounded" filename="DecovarAlpha-Rounded.ufo"/>
+    <instance location="Flared" filename="DecovarAlpha-Flared.ufo"/>
+    <instance location="Flared Open" filename="DecovarAlpha-FlaredOpen.ufo"/>
+    <instance location="Rounded Slab" filename="DecovarAlpha-RoundedSlab.ufo"/>
+    <instance location="Sheared" filename="DecovarAlpha-Sheared.ufo"/>
+    <instance location="Bifurcated" filename="DecovarAlpha-Bifurcated.ufo"/>
+    <instance location="Inline" filename="DecovarAlpha-Inline.ufo"/>
+    <instance location="Slab" filename="DecovarAlpha-Slab.ufo"/>
+    <instance location="Contrast" filename="DecovarAlpha-Contrast.ufo"/>
+    <instance location="Fancy" filename="DecovarAlpha-Fancy.ufo"/>
+    <instance location="Mayhem" filename="DecovarAlpha-Mayhem.ufo"/>
+  </instances>
+</designspace>

Tests/designspaceLib/data/test_v5_discrete.designspace

@@ -0,0 +1,139 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="Weight" values="400 700 900" default="400">
+      <labels>
+        <label uservalue="400" name="Regular" elidable="true" linkeduservalue="700"/>
+        <label uservalue="700" name="Bold"/>
+        <label uservalue="900" name="Black"/>
+      </labels>
+    </axis>
+    <axis tag="wdth" name="Width" values="75 100" default="100">
+      <labels>
+        <label uservalue="75" name="Narrow"/>
+        <label uservalue="100" name="Normal" elidable="true"/>
+      </labels>
+    </axis>
+    <axis tag="ital" name="Italic" values="0 1" default="0">
+      <labels>
+        <label uservalue="0" name="Roman" elidable="true" linkeduservalue="1"/>
+        <label uservalue="1" name="Italic"/>
+      </labels>
+    </axis>
+  </axes>
+
+  <sources>
+    <source filename="arial.ufo" name="Arial Regular">
+      <location>
+        <dimension name="Weight" xvalue="400"/>
+      </location>
+    </source>
+    <source filename="arialbd.ufo" name="Arial Bold">
+      <location>
+        <dimension name="Weight" xvalue="700"/>
+      </location>
+    </source>
+    <source filename="ariblk.ufo" name="Arial Black">
+      <location>
+        <dimension name="Weight" xvalue="900"/>
+      </location>
+    </source>
+    <source filename="ariali.ufo" name="Arial Italic">
+      <location>
+        <dimension name="Weight" xvalue="400"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="arialbi.ufo" name="Arial Bold Italic">
+      <location>
+        <dimension name="Weight" xvalue="700"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="ARIALN.ufo" name="Arial Narrow">
+      <location>
+        <dimension name="Weight" xvalue="400"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="ARIALNB.ufo" name="Arial Narrow Bold">
+      <location>
+        <dimension name="Weight" xvalue="700"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </source>
+    <source filename="ARIALNBI.ufo" name="Arial Narrow Bold Italic">
+      <location>
+        <dimension name="Weight" xvalue="700"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="ARIALNI.ufo" name="Arial Narrow Italic">
+      <location>
+        <dimension name="Weight" xvalue="400"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </source>
+  </sources>
+
+  <instances>
+    <instance name="Arial Regular">
+      <location>
+        <dimension name="Weight" xvalue="400"/>
+      </location>
+    </instance>
+    <instance name="Arial Bold">
+      <!-- Should be stylemapstylename="bold" -->
+      <location>
+        <dimension name="Weight" xvalue="700"/>
+      </location>
+    </instance>
+    <instance name="Arial Black">
+      <location>
+        <dimension name="Weight" xvalue="900"/>
+      </location>
+    </instance>
+    <instance name="Arial Italic">
+      <!-- Should be stylemapstylename="italic" -->
+      <location>
+        <dimension name="Weight" xvalue="400"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance name="Arial Bold Italic">
+      <!-- Should be stylemapstylename="bold italic" -->
+      <location>
+        <dimension name="Weight" xvalue="700"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance name="Arial Narrow">
+      <location>
+        <dimension name="Weight" xvalue="400"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Arial Narrow Bold">
+      <location>
+        <dimension name="Weight" xvalue="700"/>
+        <dimension name="Width" xvalue="75"/>
+      </location>
+    </instance>
+    <instance name="Arial Narrow Bold Italic">
+      <location>
+        <dimension name="Weight" xvalue="700"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance name="Arial Narrow Italic">
+      <location>
+        <dimension name="Weight" xvalue="400"/>
+        <dimension name="Width" xvalue="75"/>
+        <dimension name="Italic" xvalue="1"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/data/test_v5_original.designspace

@@ -0,0 +1,90 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <!--
+    NOTE: this file is the same as test_v4_original, except:
+      - the format is 5,
+      - source location width = 20 are not written out because it's the default
+      - instance <glyphs>, <kerning>, <info> are removed because deprecated
+  -->
+  <axes>
+    <axis tag="wght" name="weight" minimum="0" maximum="1000" default="0">
+      <labelname xml:lang="en">Wéíght</labelname>
+      <labelname xml:lang="fa-IR">قطر</labelname>
+    </axis>
+    <axis tag="wdth" name="width" minimum="0" maximum="1000" default="15" hidden="1">
+      <labelname xml:lang="fr">Chasse</labelname>
+      <map input="0" output="10"/>
+      <map input="15" output="20"/>
+      <map input="401" output="66"/>
+      <map input="1000" output="990"/>
+    </axis>
+  </axes>
+  <rules processing="last">
+    <rule name="named.rule.1">
+      <conditionset>
+        <condition name="axisName_a" minimum="0" maximum="1"/>
+        <condition name="axisName_b" minimum="2" maximum="3"/>
+      </conditionset>
+      <sub name="a" with="a.alt"/>
+    </rule>
+  </rules>
+  <sources>
+    <source filename="masters/masterTest1.ufo" name="master.ufo1" familyname="MasterFamilyName" stylename="MasterStyleNameOne">
+      <lib copy="1"/>
+      <features copy="1"/>
+      <info copy="1"/>
+      <glyph name="A" mute="1"/>
+      <glyph name="Z" mute="1"/>
+      <location>
+        <dimension name="weight" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="masters/masterTest2.ufo" name="master.ufo2" familyname="MasterFamilyName" stylename="MasterStyleNameTwo">
+      <kerning mute="1"/>
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+      </location>
+    </source>
+    <source filename="masters/masterTest2.ufo" name="master.ufo2" familyname="MasterFamilyName" stylename="Supports" layer="supports">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+      </location>
+    </source>
+  </sources>
+  <instances>
+    <instance name="instance.ufo1" familyname="InstanceFamilyName" stylename="InstanceStyleName" filename="instances/instanceTest1.ufo" postscriptfontname="InstancePostscriptName" stylemapfamilyname="InstanceStyleMapFamilyName" stylemapstylename="InstanceStyleMapStyleName">
+      <stylename xml:lang="fr">Demigras</stylename>
+      <stylename xml:lang="ja">半ば</stylename>
+      <familyname xml:lang="fr">Montserrat</familyname>
+      <familyname xml:lang="ja">モンセラート</familyname>
+      <stylemapstylename xml:lang="de">Standard</stylemapstylename>
+      <stylemapfamilyname xml:lang="de">Montserrat Halbfett</stylemapfamilyname>
+      <stylemapfamilyname xml:lang="ja">モンセラート SemiBold</stylemapfamilyname>
+      <location>
+        <dimension name="weight" xvalue="500"/>
+      </location>
+      <lib>
+        <dict>
+          <key>com.coolDesignspaceApp.binaryData</key>
+          <data>
+          PGJpbmFyeSBndW5rPg==
+          </data>
+          <key>com.coolDesignspaceApp.specimenText</key>
+          <string>Hamburgerwhatever</string>
+        </dict>
+      </lib>
+    </instance>
+    <instance name="instance.ufo2" familyname="InstanceFamilyName" stylename="InstanceStyleName" filename="instances/instanceTest2.ufo" postscriptfontname="InstancePostscriptName" stylemapfamilyname="InstanceStyleMapFamilyName" stylemapstylename="InstanceStyleMapStyleName">
+      <location>
+        <dimension name="weight" xvalue="500"/>
+        <dimension name="width" xvalue="400" yvalue="300"/>
+      </location>
+    </instance>
+  </instances>
+  <lib>
+    <dict>
+      <key>com.coolDesignspaceApp.previewSize</key>
+      <integer>30</integer>
+    </dict>
+  </lib>
+</designspace>

Tests/designspaceLib/data/test_v5_sourceserif.designspace

@@ -0,0 +1,646 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<designspace format="5.0">
+  <axes>
+    <axis tag="wght" name="weight" minimum="200" maximum="900" default="400">
+      <map input="200" output="0"/>
+      <map input="300" output="145"/>
+      <map input="400" output="394"/>
+      <map input="600" output="594"/>
+      <map input="700" output="823"/>
+      <map input="900" output="1000"/>
+      <labels ordering="1">
+        <label uservalue="200" userminimum="200" usermaximum="250" name="ExtraLight"/>
+        <label uservalue="300" userminimum="250" usermaximum="350" name="Light"/>
+        <label uservalue="400" userminimum="350" usermaximum="450" name="Regular" elidable="true"/>
+        <label uservalue="600" userminimum="550" usermaximum="650" name="Semibold"/>
+        <label uservalue="700" userminimum="650" usermaximum="750" name="Bold"/>
+        <label uservalue="775" userminimum="750" usermaximum="800" name="ExtraBold"/>
+        <label uservalue="900" userminimum="800" usermaximum="900" name="Black"/>
+      </labels>
+    </axis>
+    <axis tag="opsz" name="optical" minimum="8" maximum="60" default="20">
+      <labels ordering="0">
+        <label uservalue="8" userminimum="8" usermaximum="12" name="Caption"/>
+        <label uservalue="16" userminimum="12" usermaximum="18" name="SmallText"/>
+        <label uservalue="20" userminimum="18" usermaximum="26" name="Text" elidable="true"/>
+        <label uservalue="32" userminimum="26" usermaximum="48" name="Subhead"/>
+        <label uservalue="60" userminimum="48" usermaximum="60" name="Display"/>
+      </labels>
+    </axis>
+    <axis tag="ital" name="italic" values="0 1" default="0">
+      <labels ordering="2">
+        <label uservalue="0" name="Roman" elidable="true"/>
+        <label uservalue="1" name="Italic"/>
+      </labels>
+    </axis>
+  </axes>
+
+  <sources>
+    <source filename="caption/master_0/SourceSerif_c0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="caption/master_1/SourceSerif_c1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="caption/master_2/SourceSerif_c2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="text/master_0/SourceSerif_0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="text/master_1/SourceSerif_1.ufo" familyname="Source Serif 4">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="text/master_2/SourceSerif_2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="display/master_0/SourceSerif_d0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="display/master_1/SourceSerif_d1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </source>
+    <source filename="display/master_2/SourceSerif_d2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </source>
+
+    <source filename="caption/master_0/SourceSerif-Italic_c0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="caption/master_1/SourceSerif-Italic_c1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="caption/master_2/SourceSerif-Italic_c2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="text/master_0/SourceSerif-Italic_0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="text/master_1/SourceSerif-Italic_1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="text/master_2/SourceSerif-Italic_2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="display/master_0/SourceSerif-Italic_d0.ufo">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="display/master_1/SourceSerif-Italic_d1.ufo">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </source>
+    <source filename="display/master_2/SourceSerif-Italic_d2.ufo">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </source>
+  </sources>
+
+  <variable-fonts>
+    <variable-font name="SourceSerif4Variable-Roman">
+      <axis-subsets>
+        <axis-subset name="weight"/>
+        <axis-subset name="optical"/>
+        <axis-subset name="italic" uservalue="0"/>
+      </axis-subsets>
+      <!-- The per-variable-font lib is to be merged into the global lib on
+         conversion to a DS v4, overwriting keys in the global lib. -->
+      <lib>
+        <dict>
+          <key>public.skipExportGlyphs</key>
+          <array>
+            <string>caron.alt</string>
+            <string>commabelowcmb.alt</string>
+            <string>tonos.cap</string>
+            <string>f.ligalong</string>
+            <string>dieresiscmb.tight</string>
+            <string>IJ</string>
+            <string>Tbar</string>
+            <string>colontriangularmod</string>
+            <string>crossmark</string>
+            <string>ij</string>
+            <string>overline</string>
+            <string>similar</string>
+            <string>tbar</string>
+            <string>triangularbullet</string>
+            <string>turkicdsccmb</string>
+          </array>
+        </dict>
+      </lib>
+    </variable-font>
+    <variable-font name="SourceSerif4Variable-Italic">
+      <axis-subsets>
+        <axis-subset name="weight"/>
+        <axis-subset name="optical"/>
+        <axis-subset name="italic" uservalue="1"/>
+      </axis-subsets>
+      <lib>
+        <dict>
+          <key>public.skipExportGlyphs</key>
+          <array>
+            <string>caron.alt</string>
+            <string>commabelowcmb.alt</string>
+            <string>f.liga</string>
+            <string>f.ligalong</string>
+            <string>tonos.cap</string>
+            <string>dieresiscmb.tight</string>
+            <string>turkicdsccmb</string>
+          </array>
+        </dict>
+      </lib>
+    </variable-font>
+  </variable-fonts>
+
+  <instances>
+    <instance postscriptfontname="SourceSerif4Roman-CaptionExtraLight">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-CaptionLight">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-CaptionRegular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-CaptionSemibold">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-CaptionBold">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-CaptionBlack">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance stylename="SmText ExtraLight" postscriptfontname="SourceSerif4Roman-SmTextExtraLight">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="16"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance stylename="SmText Light" postscriptfontname="SourceSerif4Roman-SmTextLight">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="16"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance stylename="SmText" postscriptfontname="SourceSerif4Roman-SmTextRegular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="16"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance stylename="SmText Semibold" postscriptfontname="SourceSerif4Roman-SmTextSemibold">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="16"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance stylename="SmText Bold" postscriptfontname="SourceSerif4Roman-SmTextBold">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="16"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance stylename="SmText Black" postscriptfontname="SourceSerif4Roman-SmTextBlack">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="16"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-ExtraLight">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-Light">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance stylename="Regular" postscriptfontname="SourceSerif4Roman-Regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-Semibold">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-Bold">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-Black">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-SubheadExtraLight">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="32"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-SubheadLight">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="32"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-SubheadRegular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="32"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-SubheadSemibold">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="32"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-SubheadBold">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="32"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-SubheadBlack">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="32"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-DisplayExtraLight">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-DisplayLight">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-DisplayRegular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-DisplaySemibold">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-DisplayBold">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Roman-DisplayBlack">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="0"/>
+      </location>
+    </instance>
+
+    <instance postscriptfontname="SourceSerif4Italic-CaptionExtraLight">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-CaptionLight">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-CaptionRegular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-CaptionSemibold">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-CaptionBold">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-CaptionBlack">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="8"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance stylename="SmText ExtraLight Italic" postscriptfontname="SourceSerif4Italic-SmTextExtraLight">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="16"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance stylename="SmText Light Italic" postscriptfontname="SourceSerif4Italic-SmTextLight">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="16"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance stylename="SmText Italic" postscriptfontname="SourceSerif4Italic-SmTextRegular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="16"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance stylename="SmText Semibold Italic" postscriptfontname="SourceSerif4Italic-SmTextSemibold">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="16"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance stylename="SmText Bold Italic" postscriptfontname="SourceSerif4Italic-SmTextBold">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="16"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance stylename="SmText Black Italic" postscriptfontname="SourceSerif4Italic-SmTextBlack">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="16"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-ExtraLight">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-Light">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-Regular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-Semibold">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-Bold">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-Black">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="20"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-SubheadExtraLight">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="32"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-SubheadLight">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="32"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-SubheadRegular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="32"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-SubheadSemibold">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="32"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-SubheadBold">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="32"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-SubheadBlack">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="32"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-DisplayExtraLight">
+      <location>
+        <dimension name="weight" xvalue="0"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-DisplayLight">
+      <location>
+        <dimension name="weight" xvalue="145"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-DisplayRegular">
+      <location>
+        <dimension name="weight" xvalue="394"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-DisplaySemibold">
+      <location>
+        <dimension name="weight" xvalue="594"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-DisplayBold">
+      <location>
+        <dimension name="weight" xvalue="823"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+    <instance postscriptfontname="SourceSerif4Italic-DisplayBlack">
+      <location>
+        <dimension name="weight" xvalue="1000"/>
+        <dimension name="optical" xvalue="60"/>
+        <dimension name="italic" xvalue="1"/>
+      </location>
+    </instance>
+  </instances>
+</designspace>

Tests/designspaceLib/designspace_test.py

@@ -1,15 +1,25 @@
 # coding=utf-8
 
 import os
-import sys
-import pytest
-import warnings
+import re
 
-from fontTools.misc import plistlib
-from fontTools.designspaceLib import (
-    DesignSpaceDocument, SourceDescriptor, AxisDescriptor, RuleDescriptor,
-    InstanceDescriptor, evaluateRule, processRules, posix, DesignSpaceDocumentError)
+import pytest
 from fontTools import ttLib
+from fontTools.designspaceLib import (
+    AxisDescriptor,
+    AxisLabelDescriptor,
+    DesignSpaceDocument,
+    DesignSpaceDocumentError,
+    DiscreteAxisDescriptor,
+    InstanceDescriptor,
+    RuleDescriptor,
+    SourceDescriptor,
+    evaluateRule,
+    posix,
+    processRules,
+)
+from fontTools.misc import plistlib
+
 
 def _axesAsDict(axes):
     """
@@ -30,19 +40,22 @@ def _axesAsDict(axes):
 
 
 def assert_equals_test_file(path, test_filename):
-    with open(path) as fp:
+    with open(path, encoding="utf-8") as fp:
         actual = fp.read()
 
     test_path = os.path.join(os.path.dirname(__file__), test_filename)
-    with open(test_path) as fp:
+    with open(test_path, encoding="utf-8") as fp:
         expected = fp.read()
+        expected = re.sub(r"<!--(.|\n)*?-->", "", expected)
+        expected = re.sub(r"\s*\n+", "\n", expected)
 
     assert actual == expected
 
 
 def test_fill_document(tmpdir):
     tmpdir = str(tmpdir)
-    testDocPath = os.path.join(tmpdir, "test.designspace")
+    testDocPath = os.path.join(tmpdir, "test_v4.designspace")
+    testDocPath5 = os.path.join(tmpdir, "test_v5.designspace")
     masterPath1 = os.path.join(tmpdir, "masters", "masterTest1.ufo")
     masterPath2 = os.path.join(tmpdir, "masters", "masterTest2.ufo")
     instancePath1 = os.path.join(tmpdir, "instances", "instanceTest1.ufo")
@@ -121,6 +134,10 @@ def test_fill_document(tmpdir):
     i1.postScriptFontName = "InstancePostscriptName"
     i1.styleMapFamilyName = "InstanceStyleMapFamilyName"
     i1.styleMapStyleName = "InstanceStyleMapStyleName"
+    i1.localisedStyleName = dict(fr="Demigras", ja="半ば")
+    i1.localisedFamilyName = dict(fr="Montserrat", ja="モンセラート")
+    i1.localisedStyleMapStyleName = dict(de="Standard")
+    i1.localisedStyleMapFamilyName = dict(de="Montserrat Halbfett", ja="モンセラート SemiBold")
     glyphData = dict(name="arrow", mute=True, unicodes=[0x123, 0x124, 0x125])
     i1.glyphs['arrow'] = glyphData
     i1.lib['com.coolDesignspaceApp.binaryData'] = plistlib.Data(b'<binary gunk>')
@@ -158,16 +175,21 @@ def test_fill_document(tmpdir):
     ])
     r1.subs.append(("a", "a.alt"))
     doc.addRule(r1)
-    # write the document
+    # write the document; without an explicit format it will be 5.0 by default
+    doc.write(testDocPath5)
+    assert os.path.exists(testDocPath5)
+    assert_equals_test_file(testDocPath5, 'data/test_v5_original.designspace')
+    # write again with an explicit format = 4.1
+    doc.formatVersion = "4.1"
     doc.write(testDocPath)
     assert os.path.exists(testDocPath)
-    assert_equals_test_file(testDocPath, 'data/test.designspace')
+    assert_equals_test_file(testDocPath, 'data/test_v4_original.designspace')
     # import it again
     new = DesignSpaceDocument()
     new.read(testDocPath)
 
     assert new.default.location == {'width': 20.0, 'weight': 0.0}
-    assert new.filename == 'test.designspace'
+    assert new.filename == 'test_v4.designspace'
     assert new.lib == doc.lib
     assert new.instances[0].lib == doc.instances[0].lib
 
@@ -197,6 +219,7 @@ def test_unicodes(tmpdir):
     instancePath1 = os.path.join(tmpdir, "instances", "instanceTest1.ufo")
     instancePath2 = os.path.join(tmpdir, "instances", "instanceTest2.ufo")
     doc = DesignSpaceDocument()
+    doc.formatVersion = "4.1"  # This test about instance glyphs is deprecated in v5
     # add master 1
     s1 = SourceDescriptor()
     s1.filename = os.path.relpath(masterPath1, os.path.dirname(testDocPath))
@@ -832,7 +855,7 @@ def test_updatePaths(tmpdir):
 
 def test_read_with_path_object():
     import pathlib
-    source = (pathlib.Path(__file__) / "../data/test.designspace").resolve()
+    source = (pathlib.Path(__file__) / "../data/test_v4_original.designspace").resolve()
     assert source.exists()
     doc = DesignSpaceDocument()
     doc.read(source)
@@ -841,7 +864,7 @@ def test_read_with_path_object():
 def test_with_with_path_object(tmpdir):
     import pathlib
     tmpdir = str(tmpdir)
-    dest = pathlib.Path(tmpdir) / "test.designspace"
+    dest = pathlib.Path(tmpdir) / "test_v4_original.designspace"
     doc = DesignSpaceDocument()
     doc.write(dest)
     assert dest.exists()

Tests/designspaceLib/designspace_v5_test.py

@@ -0,0 +1,888 @@
+import re
+import shutil
+from pathlib import Path
+
+import pytest
+from fontTools.designspaceLib import (
+    AxisDescriptor,
+    AxisLabelDescriptor,
+    DesignSpaceDocument,
+    DiscreteAxisDescriptor,
+    InstanceDescriptor,
+    LocationLabelDescriptor,
+    RangeAxisSubsetDescriptor,
+    SourceDescriptor,
+    ValueAxisSubsetDescriptor,
+    VariableFontDescriptor,
+    posix,
+)
+
+from .fixtures import datadir
+
+
+def assert_descriptors_equal(actual, expected):
+    assert len(actual) == len(expected)
+    for a, e in zip(actual, expected):
+        assert a.asdict() == e.asdict()
+
+
+def test_read_v5_document_simple(datadir):
+    doc = DesignSpaceDocument.fromfile(datadir / "test_v5.designspace")
+
+    assert_descriptors_equal(
+        doc.axes,
+        [
+            AxisDescriptor(
+                tag="wght",
+                name="weight",
+                minimum=200,
+                maximum=1000,
+                default=200,
+                labelNames={"en": "Wéíght", "fa-IR": "قطر"},
+                map=[
+                    (200, 0),
+                    (300, 100),
+                    (400, 368),
+                    (600, 600),
+                    (700, 824),
+                    (900, 1000),
+                ],
+                axisOrdering=None,
+                axisLabels=[
+                    AxisLabelDescriptor(
+                        name="Extra Light",
+                        userMinimum=200,
+                        userValue=200,
+                        userMaximum=250,
+                        labelNames={"de": "Extraleicht", "fr": "Extra léger"},
+                    ),
+                    AxisLabelDescriptor(
+                        name="Light", userMinimum=250, userValue=300, userMaximum=350
+                    ),
+                    AxisLabelDescriptor(
+                        name="Regular",
+                        userMinimum=350,
+                        userValue=400,
+                        userMaximum=450,
+                        elidable=True,
+                    ),
+                    AxisLabelDescriptor(
+                        name="Semi Bold",
+                        userMinimum=450,
+                        userValue=600,
+                        userMaximum=650,
+                    ),
+                    AxisLabelDescriptor(
+                        name="Bold", userMinimum=650, userValue=700, userMaximum=850
+                    ),
+                    AxisLabelDescriptor(
+                        name="Black", userMinimum=850, userValue=900, userMaximum=900
+                    ),
+                ],
+            ),
+            AxisDescriptor(
+                tag="wdth",
+                name="width",
+                minimum=50,
+                maximum=150,
+                default=100,
+                hidden=True,
+                labelNames={"fr": "Chasse"},
+                map=[(50, 10), (100, 20), (125, 66), (150, 990)],
+                axisOrdering=1,
+                axisLabels=[
+                    AxisLabelDescriptor(name="Condensed", userValue=50),
+                    AxisLabelDescriptor(
+                        name="Normal", elidable=True, olderSibling=True, userValue=100
+                    ),
+                    AxisLabelDescriptor(name="Wide", userValue=125),
+                    AxisLabelDescriptor(
+                        name="Extra Wide", userValue=150, userMinimum=150
+                    ),
+                ],
+            ),
+            DiscreteAxisDescriptor(
+                tag="ital",
+                name="Italic",
+                values=[0, 1],
+                default=0,
+                axisOrdering=None,
+                axisLabels=[
+                    AxisLabelDescriptor(
+                        name="Roman", userValue=0, elidable=True, linkedUserValue=1
+                    ),
+                    AxisLabelDescriptor(name="Italic", userValue=1),
+                ],
+            ),
+        ],
+    )
+
+    assert_descriptors_equal(
+        doc.locationLabels,
+        [
+            LocationLabelDescriptor(
+                name="Some Style",
+                labelNames={"fr": "Un Style"},
+                userLocation={"weight": 300, "width": 50, "Italic": 0},
+            ),
+            LocationLabelDescriptor(
+                name="Other", userLocation={"weight": 700, "width": 100, "Italic": 1}
+            ),
+        ],
+    )
+
+    assert_descriptors_equal(
+        doc.sources,
+        [
+            SourceDescriptor(
+                filename="masters/masterTest1.ufo",
+                path=posix(str((datadir / "masters/masterTest1.ufo").resolve())),
+                name="master.ufo1",
+                layerName=None,
+                location={"weight": 0.0, "width": 20.0},
+                copyLib=True,
+                copyInfo=True,
+                copyGroups=False,
+                copyFeatures=True,
+                muteKerning=False,
+                muteInfo=False,
+                mutedGlyphNames=["A", "Z"],
+                familyName="MasterFamilyName",
+                styleName="MasterStyleNameOne",
+                localisedFamilyName={"fr": "Montserrat", "ja": "モンセラート"},
+            ),
+            SourceDescriptor(
+                filename="masters/masterTest2.ufo",
+                path=posix(str((datadir / "masters/masterTest2.ufo").resolve())),
+                name="master.ufo2",
+                layerName=None,
+                location={"weight": 1000.0, "width": 20.0},
+                copyLib=False,
+                copyInfo=False,
+                copyGroups=False,
+                copyFeatures=False,
+                muteKerning=True,
+                muteInfo=False,
+                mutedGlyphNames=[],
+                familyName="MasterFamilyName",
+                styleName="MasterStyleNameTwo",
+                localisedFamilyName={},
+            ),
+            SourceDescriptor(
+                filename="masters/masterTest2.ufo",
+                path=posix(str((datadir / "masters/masterTest2.ufo").resolve())),
+                name="master.ufo2",
+                layerName="supports",
+                location={"weight": 1000.0, "width": 20.0},
+                copyLib=False,
+                copyInfo=False,
+                copyGroups=False,
+                copyFeatures=False,
+                muteKerning=False,
+                muteInfo=False,
+                mutedGlyphNames=[],
+                familyName="MasterFamilyName",
+                styleName="Supports",
+                localisedFamilyName={},
+            ),
+        ],
+    )
+
+    assert_descriptors_equal(
+        doc.variableFonts,
+        [
+            VariableFontDescriptor(
+                name="Test_WghtWdth",
+                filename="Test_WghtWdth_different_from_name.ttf",
+                axisSubsets=[
+                    RangeAxisSubsetDescriptor(name="Weight"),
+                    RangeAxisSubsetDescriptor(name="Width"),
+                ],
+                lib={"com.vtt.source": "sources/vtt/Test_WghtWdth.vtt"},
+            ),
+            VariableFontDescriptor(
+                name="Test_Wght",
+                axisSubsets=[RangeAxisSubsetDescriptor(name="Weight")],
+                lib={"com.vtt.source": "sources/vtt/Test_Wght.vtt"},
+            ),
+            VariableFontDescriptor(
+                name="TestCd_Wght",
+                axisSubsets=[
+                    RangeAxisSubsetDescriptor(name="Weight"),
+                    ValueAxisSubsetDescriptor(name="Width", userValue=0),
+                ],
+            ),
+            VariableFontDescriptor(
+                name="TestWd_Wght",
+                axisSubsets=[
+                    RangeAxisSubsetDescriptor(name="Weight"),
+                    ValueAxisSubsetDescriptor(name="Width", userValue=1000),
+                ],
+            ),
+            VariableFontDescriptor(
+                name="TestItalic_Wght",
+                axisSubsets=[
+                    RangeAxisSubsetDescriptor(name="Weight"),
+                    ValueAxisSubsetDescriptor(name="Italic", userValue=1),
+                ],
+            ),
+            VariableFontDescriptor(
+                name="TestRB_Wght",
+                axisSubsets=[
+                    RangeAxisSubsetDescriptor(
+                        name="Weight", userMinimum=400, userDefault=400, userMaximum=700
+                    ),
+                    ValueAxisSubsetDescriptor(name="Italic", userValue=0),
+                ],
+            ),
+        ],
+    )
+
+    assert_descriptors_equal(
+        doc.instances,
+        [
+            InstanceDescriptor(
+                filename="instances/instanceTest1.ufo",
+                path=posix(str((datadir / "instances/instanceTest1.ufo").resolve())),
+                name="instance.ufo1",
+                designLocation={"weight": 500.0, "width": 20.0},
+                familyName="InstanceFamilyName",
+                styleName="InstanceStyleName",
+                postScriptFontName="InstancePostscriptName",
+                styleMapFamilyName="InstanceStyleMapFamilyName",
+                styleMapStyleName="InstanceStyleMapStyleName",
+                localisedFamilyName={"fr": "Montserrat", "ja": "モンセラート"},
+                localisedStyleName={"fr": "Demigras", "ja": "半ば"},
+                localisedStyleMapFamilyName={
+                    "de": "Montserrat Halbfett",
+                    "ja": "モンセラート SemiBold",
+                },
+                localisedStyleMapStyleName={"de": "Standard"},
+                glyphs={"arrow": {"mute": True, "unicodes": [291, 292, 293]}},
+                lib={
+                    "com.coolDesignspaceApp.binaryData": b"<binary gunk>",
+                    "com.coolDesignspaceApp.specimenText": "Hamburgerwhatever",
+                },
+            ),
+            InstanceDescriptor(
+                filename="instances/instanceTest2.ufo",
+                path=posix(str((datadir / "instances/instanceTest2.ufo").resolve())),
+                name="instance.ufo2",
+                designLocation={"weight": 500.0, "width": (400.0, 300.0)},
+                familyName="InstanceFamilyName",
+                styleName="InstanceStyleName",
+                postScriptFontName="InstancePostscriptName",
+                styleMapFamilyName="InstanceStyleMapFamilyName",
+                styleMapStyleName="InstanceStyleMapStyleName",
+                glyphs={
+                    "arrow": {
+                        "unicodes": [101, 201, 301],
+                        "note": "A note about this glyph",
+                        "instanceLocation": {"weight": 120.0, "width": 100.0},
+                        "masters": [
+                            {
+                                "font": "master.ufo1",
+                                "location": {"weight": 20.0, "width": 20.0},
+                                "glyphName": "BB",
+                            },
+                            {
+                                "font": "master.ufo2",
+                                "location": {"weight": 900.0, "width": 900.0},
+                                "glyphName": "CC",
+                            },
+                        ],
+                    },
+                    "arrow2": {},
+                },
+            ),
+            InstanceDescriptor(
+                locationLabel="asdf",
+            ),
+            InstanceDescriptor(
+                designLocation={"weight": 600.0, "width": (401.0, 420.0)},
+            ),
+            InstanceDescriptor(
+                designLocation={"weight": 10.0, "Italic": 0.0},
+                userLocation={"width": 100.0},
+            ),
+            InstanceDescriptor(
+                userLocation={"weight": 300.0, "width": 130.0, "Italic": 1.0},
+            ),
+        ],
+    )
+
+
+def test_read_v5_document_decovar(datadir):
+    doc = DesignSpaceDocument.fromfile(datadir / "test_v5_decovar.designspace")
+
+    assert not doc.variableFonts
+
+    assert_descriptors_equal(
+        doc.axes,
+        [
+            AxisDescriptor(
+                default=0, maximum=1000, minimum=0, name="Inline", tag="BLDA"
+            ),
+            AxisDescriptor(
+                default=0, maximum=1000, minimum=0, name="Shearded", tag="TRMD"
+            ),
+            AxisDescriptor(
+                default=0, maximum=1000, minimum=0, name="Rounded Slab", tag="TRMC"
+            ),
+            AxisDescriptor(
+                default=0, maximum=1000, minimum=0, name="Stripes", tag="SKLD"
+            ),
+            AxisDescriptor(
+                default=0, maximum=1000, minimum=0, name="Worm Terminal", tag="TRML"
+            ),
+            AxisDescriptor(
+                default=0, maximum=1000, minimum=0, name="Inline Skeleton", tag="SKLA"
+            ),
+            AxisDescriptor(
+                default=0,
+                maximum=1000,
+                minimum=0,
+                name="Open Inline Terminal",
+                tag="TRMF",
+            ),
+            AxisDescriptor(
+                default=0, maximum=1000, minimum=0, name="Inline Terminal", tag="TRMK"
+            ),
+            AxisDescriptor(default=0, maximum=1000, minimum=0, name="Worm", tag="BLDB"),
+            AxisDescriptor(
+                default=0, maximum=1000, minimum=0, name="Weight", tag="WMX2"
+            ),
+            AxisDescriptor(
+                default=0, maximum=1000, minimum=0, name="Flared", tag="TRMB"
+            ),
+            AxisDescriptor(
+                default=0, maximum=1000, minimum=0, name="Rounded", tag="TRMA"
+            ),
+            AxisDescriptor(
+                default=0, maximum=1000, minimum=0, name="Worm Skeleton", tag="SKLB"
+            ),
+            AxisDescriptor(default=0, maximum=1000, minimum=0, name="Slab", tag="TRMG"),
+            AxisDescriptor(
+                default=0, maximum=1000, minimum=0, name="Bifurcated", tag="TRME"
+            ),
+        ],
+    )
+
+    assert_descriptors_equal(
+        doc.locationLabels,
+        [
+            LocationLabelDescriptor(name="Default", elidable=True, userLocation={}),
+            LocationLabelDescriptor(
+                name="Open", userLocation={"Inline": 1000}, labelNames={"de": "Offen"}
+            ),
+            LocationLabelDescriptor(name="Worm", userLocation={"Worm": 1000}),
+            LocationLabelDescriptor(
+                name="Checkered", userLocation={"Inline Skeleton": 1000}
+            ),
+            LocationLabelDescriptor(
+                name="Checkered Reverse", userLocation={"Inline Terminal": 1000}
+            ),
+            LocationLabelDescriptor(name="Striped", userLocation={"Stripes": 500}),
+            LocationLabelDescriptor(name="Rounded", userLocation={"Rounded": 1000}),
+            LocationLabelDescriptor(name="Flared", userLocation={"Flared": 1000}),
+            LocationLabelDescriptor(
+                name="Flared Open",
+                userLocation={"Inline Skeleton": 1000, "Flared": 1000},
+            ),
+            LocationLabelDescriptor(
+                name="Rounded Slab", userLocation={"Rounded Slab": 1000}
+            ),
+            LocationLabelDescriptor(name="Sheared", userLocation={"Shearded": 1000}),
+            LocationLabelDescriptor(
+                name="Bifurcated", userLocation={"Bifurcated": 1000}
+            ),
+            LocationLabelDescriptor(
+                name="Inline",
+                userLocation={"Inline Skeleton": 500, "Open Inline Terminal": 500},
+            ),
+            LocationLabelDescriptor(name="Slab", userLocation={"Slab": 1000}),
+            LocationLabelDescriptor(name="Contrast", userLocation={"Weight": 1000}),
+            LocationLabelDescriptor(
+                name="Fancy",
+                userLocation={"Inline Skeleton": 1000, "Flared": 1000, "Weight": 1000},
+            ),
+            LocationLabelDescriptor(
+                name="Mayhem",
+                userLocation={
+                    "Inline Skeleton": 1000,
+                    "Worm Skeleton": 1000,
+                    "Rounded": 500,
+                    "Flared": 500,
+                    "Rounded Slab": 750,
+                    "Bifurcated": 500,
+                    "Open Inline Terminal": 250,
+                    "Slab": 750,
+                    "Inline Terminal": 250,
+                    "Worm Terminal": 250,
+                    "Weight": 750,
+                    "Worm": 1000,
+                },
+            ),
+        ],
+    )
+
+    assert [i.locationLabel for i in doc.instances] == [
+        "Default",
+        "Open",
+        "Worm",
+        "Checkered",
+        "Checkered Reverse",
+        "Striped",
+        "Rounded",
+        "Flared",
+        "Flared Open",
+        "Rounded Slab",
+        "Sheared",
+        "Bifurcated",
+        "Inline",
+        "Slab",
+        "Contrast",
+        "Fancy",
+        "Mayhem",
+    ]
+
+
+def test_read_v5_document_discrete(datadir):
+    doc = DesignSpaceDocument.fromfile(datadir / "test_v5_discrete.designspace")
+
+    assert not doc.locationLabels
+    assert not doc.variableFonts
+
+    assert_descriptors_equal(
+        doc.axes,
+        [
+            DiscreteAxisDescriptor(
+                default=400,
+                values=[400, 700, 900],
+                name="Weight",
+                tag="wght",
+                axisLabels=[
+                    AxisLabelDescriptor(
+                        name="Regular",
+                        userValue=400,
+                        elidable=True,
+                        linkedUserValue=700,
+                    ),
+                    AxisLabelDescriptor(name="Bold", userValue=700),
+                    AxisLabelDescriptor(name="Black", userValue=900),
+                ],
+            ),
+            DiscreteAxisDescriptor(
+                default=100,
+                values=[75, 100],
+                name="Width",
+                tag="wdth",
+                axisLabels=[
+                    AxisLabelDescriptor(name="Narrow", userValue=75),
+                    AxisLabelDescriptor(name="Normal", userValue=100, elidable=True),
+                ],
+            ),
+            DiscreteAxisDescriptor(
+                default=0,
+                values=[0, 1],
+                name="Italic",
+                tag="ital",
+                axisLabels=[
+                    AxisLabelDescriptor(
+                        name="Roman", userValue=0, elidable=True, linkedUserValue=1
+                    ),
+                    AxisLabelDescriptor(name="Italic", userValue=1),
+                ],
+            ),
+        ],
+    )
+
+
+def test_read_v5_document_aktiv(datadir):
+    doc = DesignSpaceDocument.fromfile(datadir / "test_v5_aktiv.designspace")
+
+    assert not doc.locationLabels
+
+    assert_descriptors_equal(
+        doc.axes,
+        [
+            AxisDescriptor(
+                tag="wght",
+                name="Weight",
+                minimum=100,
+                default=400,
+                maximum=900,
+                map=[
+                    (100, 22),
+                    (200, 38),
+                    (300, 57),
+                    (400, 84),
+                    (500, 98),
+                    (600, 115),
+                    (700, 133),
+                    (800, 158),
+                    (900, 185),
+                ],
+                axisOrdering=1,
+                axisLabels=[
+                    AxisLabelDescriptor(name="Hair", userValue=100),
+                    AxisLabelDescriptor(userValue=200, name="Thin"),
+                    AxisLabelDescriptor(userValue=300, name="Light"),
+                    AxisLabelDescriptor(
+                        userValue=400,
+                        name="Regular",
+                        elidable=True,
+                        linkedUserValue=700,
+                    ),
+                    AxisLabelDescriptor(userValue=500, name="Medium"),
+                    AxisLabelDescriptor(userValue=600, name="SemiBold"),
+                    AxisLabelDescriptor(userValue=700, name="Bold"),
+                    AxisLabelDescriptor(userValue=800, name="XBold"),
+                    AxisLabelDescriptor(userValue=900, name="Black"),
+                ],
+            ),
+            AxisDescriptor(
+                tag="wdth",
+                name="Width",
+                minimum=75,
+                default=100,
+                maximum=125,
+                axisOrdering=0,
+                axisLabels=[
+                    AxisLabelDescriptor(name="Cd", userValue=75),
+                    AxisLabelDescriptor(name="Normal", elidable=True, userValue=100),
+                    AxisLabelDescriptor(name="Ex", userValue=125),
+                ],
+            ),
+            AxisDescriptor(
+                tag="ital",
+                name="Italic",
+                minimum=0,
+                default=0,
+                maximum=1,
+                axisOrdering=2,
+                axisLabels=[
+                    AxisLabelDescriptor(
+                        name="Upright", userValue=0, elidable=True, linkedUserValue=1
+                    ),
+                    AxisLabelDescriptor(name="Italic", userValue=1),
+                ],
+            ),
+        ],
+    )
+
+    assert_descriptors_equal(
+        doc.variableFonts,
+        [
+            VariableFontDescriptor(
+                name="AktivGroteskVF_WghtWdthItal",
+                axisSubsets=[
+                    RangeAxisSubsetDescriptor(name="Weight"),
+                    RangeAxisSubsetDescriptor(name="Width"),
+                    RangeAxisSubsetDescriptor(name="Italic"),
+                ],
+            ),
+            VariableFontDescriptor(
+                name="AktivGroteskVF_WghtWdth",
+                axisSubsets=[
+                    RangeAxisSubsetDescriptor(name="Weight"),
+                    RangeAxisSubsetDescriptor(name="Width"),
+                ],
+            ),
+            VariableFontDescriptor(
+                name="AktivGroteskVF_Wght",
+                axisSubsets=[
+                    RangeAxisSubsetDescriptor(name="Weight"),
+                ],
+            ),
+            VariableFontDescriptor(
+                name="AktivGroteskVF_Italics_WghtWdth",
+                axisSubsets=[
+                    RangeAxisSubsetDescriptor(name="Weight"),
+                    RangeAxisSubsetDescriptor(name="Width"),
+                    ValueAxisSubsetDescriptor(name="Italic", userValue=1),
+                ],
+            ),
+            VariableFontDescriptor(
+                name="AktivGroteskVF_Italics_Wght",
+                axisSubsets=[
+                    RangeAxisSubsetDescriptor(name="Weight"),
+                    ValueAxisSubsetDescriptor(name="Italic", userValue=1),
+                ],
+            ),
+        ],
+    )
+
+
+@pytest.fixture
+def map_doc():
+    """Generate a document with a few axes to test the mapping functions"""
+    doc = DesignSpaceDocument()
+    doc.addAxis(
+        AxisDescriptor(
+            tag="wght",
+            name="Weight",
+            minimum=100,
+            maximum=900,
+            default=100,
+            map=[(100, 10), (900, 90)],
+        )
+    )
+    doc.addAxis(
+        AxisDescriptor(
+            tag="wdth",
+            name="Width",
+            minimum=75,
+            maximum=200,
+            default=100,
+            map=[(75, 7500), (100, 10000), (200, 20000)],
+        )
+    )
+    doc.addAxis(
+        AxisDescriptor(tag="CUST", name="Custom", minimum=1, maximum=2, default=1.5)
+    )
+    doc.addLocationLabel(
+        LocationLabelDescriptor(
+            name="Wonky", userLocation={"Weight": 800, "Custom": 1.2}
+        )
+    )
+    return doc
+
+
+def test_doc_location_map_forward(map_doc: DesignSpaceDocument):
+    assert map_doc.map_forward({"Weight": 400, "Width": 150, "Custom": 2}) == {
+        "Weight": 40,
+        "Width": 15000,
+        "Custom": 2,
+    }, "The mappings should be used to compute the design locations"
+    assert map_doc.map_forward({"Weight": 400}) == {
+        "Weight": 40,
+        "Width": 10000,
+        "Custom": 1.5,
+    }, "Missing user locations should be assumed equal to the axis's default"
+
+
+def test_doc_location_map_backward(map_doc: DesignSpaceDocument):
+    assert map_doc.map_backward({"Weight": 40, "Width": 15000, "Custom": 2}) == {
+        "Weight": 400,
+        "Width": 150,
+        "Custom": 2,
+    }, "The mappings should be used to compute the user locations"
+    assert map_doc.map_backward({"Weight": 40}) == {
+        "Weight": 400,
+        "Width": 100,
+        "Custom": 1.5,
+    }, "Missing design locations should be assumed equal to the axis's default"
+    assert map_doc.map_backward(
+        {"Weight": (40, 50), "Width": (15000, 100000), "Custom": (2, 1.5)}
+    ) == {
+        "Weight": 400,
+        "Width": 150,
+        "Custom": 2,
+    }, "Only the xvalue of anisotropic locations is used"
+
+
+def test_instance_location_from_label(map_doc):
+    inst = InstanceDescriptor(locationLabel="Wonky")
+    assert inst.getFullUserLocation(map_doc) == {
+        "Weight": 800,
+        "Width": 100,
+        "Custom": 1.2,
+    }, "an instance with a locationLabel uses the user location from that label, empty values on the label use axis defaults"
+    assert inst.getFullDesignLocation(map_doc) == {
+        "Weight": 80,
+        "Width": 10000,
+        "Custom": 1.2,
+    }, "an instance with a locationLabel computes the design location from that label, empty values on the label use axis defaults"
+
+    inst = InstanceDescriptor(locationLabel="Wonky", userLocation={"Width": 200})
+    assert inst.getFullUserLocation(map_doc) == {
+        "Weight": 800,
+        "Width": 100,
+        "Custom": 1.2,
+    }, "an instance with a locationLabel uses the user location from that label, other location values are ignored"
+    assert inst.getFullDesignLocation(map_doc) == {
+        "Weight": 80,
+        "Width": 10000,
+        "Custom": 1.2,
+    }, "an instance with a locationLabel computes the design location from that label, other location values are ignored"
+
+
+def test_instance_location_no_data(map_doc):
+    inst = InstanceDescriptor()
+    assert inst.getFullUserLocation(map_doc) == {
+        "Weight": 100,
+        "Width": 100,
+        "Custom": 1.5,
+    }, "an instance without any location data has the default user location"
+    assert inst.getFullDesignLocation(map_doc) == {
+        "Weight": 10,
+        "Width": 10000,
+        "Custom": 1.5,
+    }, "an instance without any location data has the default design location"
+
+
+def test_instance_location_design_first(map_doc):
+    inst = InstanceDescriptor(
+        designLocation={"Weight": (60, 61), "Width": 11000, "Custom": 1.2},
+        userLocation={"Weight": 700, "Width": 180, "Custom": 1.4},
+    )
+    assert inst.getFullUserLocation(map_doc) == {
+        "Weight": 600,
+        "Width": 110,
+        "Custom": 1.2,
+    }, "when both design and user location data are provided, design wins"
+    assert inst.getFullDesignLocation(map_doc) == {
+        "Weight": (60, 61),
+        "Width": 11000,
+        "Custom": 1.2,
+    }, "when both design and user location data are provided, design wins (incl. anisotropy)"
+
+
+def test_instance_location_mix(map_doc):
+    inst = InstanceDescriptor(
+        designLocation={"Weight": (60, 61)},
+        userLocation={"Width": 180},
+    )
+    assert inst.getFullUserLocation(map_doc) == {
+        "Weight": 600,
+        "Width": 180,
+        "Custom": 1.5,
+    }, "instance location is a mix of design and user locations"
+    assert inst.getFullDesignLocation(map_doc) == {
+        "Weight": (60, 61),
+        "Width": 18000,
+        "Custom": 1.5,
+    }, "instance location is a mix of design and user location"
+
+
+@pytest.mark.parametrize(
+    "filename",
+    [
+        "test_v4_original.designspace",
+        "test_v5_original.designspace",
+        "test_v5_aktiv.designspace",
+        "test_v5_decovar.designspace",
+        "test_v5_discrete.designspace",
+        "test_v5_sourceserif.designspace",
+        "test_v5.designspace",
+    ],
+)
+def test_roundtrip(tmpdir, datadir, filename):
+    test_file = datadir / filename
+    output_path = tmpdir / filename
+    # Move the file to the tmpdir so that the filenames stay the same
+    # (they're relative to the file's path)
+    shutil.copy(test_file, output_path)
+    doc = DesignSpaceDocument.fromfile(output_path)
+    doc.write(output_path)
+    # The input XML has comments and empty lines for documentation purposes
+    xml = test_file.read_text(encoding="utf-8")
+    xml = re.sub(
+        r"<!-- ROUNDTRIP_TEST_REMOVE_ME_BEGIN -->(.|\n)*?<!-- ROUNDTRIP_TEST_REMOVE_ME_END -->",
+        "",
+        xml,
+    )
+    xml = re.sub(r"<!--(.|\n)*?-->", "", xml)
+    xml = re.sub(r"\s*\n+", "\n", xml)
+    assert output_path.read_text(encoding="utf-8") == xml
+
+
+def test_using_v5_features_upgrades_format(tmpdir, datadir):
+    test_file = datadir / "test_v4_original.designspace"
+    output_4_path = tmpdir / "test_v4.designspace"
+    output_5_path = tmpdir / "test_v5.designspace"
+    shutil.copy(test_file, output_4_path)
+    doc = DesignSpaceDocument.fromfile(output_4_path)
+    doc.write(output_4_path)
+    assert 'format="4.1"' in output_4_path.read_text(encoding="utf-8")
+    doc.addVariableFont(VariableFontDescriptor(name="TestVF"))
+    doc.write(output_5_path)
+    assert 'format="5.0"' in output_5_path.read_text(encoding="utf-8")
+
+
+def test_addAxisDescriptor_discrete():
+    ds = DesignSpaceDocument()
+
+    axis = ds.addAxisDescriptor(
+        name="Italic",
+        tag="ital",
+        values=[0, 1],
+        default=0,
+        hidden=True,
+        map=[(0, -12), (1, 0)],
+        axisOrdering=3,
+        axisLabels=[
+            AxisLabelDescriptor(
+                name="Roman",
+                userValue=0,
+                elidable=True,
+                olderSibling=True,
+                linkedUserValue=1,
+                labelNames={"fr": "Romain"},
+            )
+        ],
+    )
+
+    assert ds.axes[0] is axis
+    assert_descriptors_equal(
+        [axis],
+        [
+            DiscreteAxisDescriptor(
+                tag="ital",
+                name="Italic",
+                values=[0, 1],
+                default=0,
+                hidden=True,
+                map=[(0, -12), (1, 0)],
+                axisOrdering=3,
+                axisLabels=[
+                    AxisLabelDescriptor(
+                        name="Roman",
+                        userValue=0,
+                        elidable=True,
+                        olderSibling=True,
+                        linkedUserValue=1,
+                        labelNames={"fr": "Romain"},
+                    )
+                ],
+            )
+        ],
+    )
+
+
+def test_addLocationLabelDescriptor():
+    ds = DesignSpaceDocument()
+
+    label = ds.addLocationLabelDescriptor(
+        name="Somewhere",
+        userLocation={},
+        elidable=True,
+        olderSibling=True,
+        labelNames={"fr": "Quelque part"},
+    )
+
+    assert ds.locationLabels[0] is label
+    assert_descriptors_equal(
+        [label],
+        [
+            LocationLabelDescriptor(
+                name="Somewhere",
+                userLocation={},
+                elidable=True,
+                olderSibling=True,
+                labelNames={"fr": "Quelque part"},
+            )
+        ],
+    )
+
+
+def test_addVariableFontDescriptor():
+    ds = DesignSpaceDocument()
+
+    vf = ds.addVariableFontDescriptor(name="TestVF", filename="TestVF.ttf")
+
+    assert ds.variableFonts[0] is vf
+    assert_descriptors_equal(
+        [vf], [VariableFontDescriptor(name="TestVF", filename="TestVF.ttf")]
+    )

Tests/designspaceLib/fixtures.py

@@ -0,0 +1,8 @@
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture
+def datadir():
+    return Path(__file__).parent / "data"

Tests/designspaceLib/split_test.py

@@ -0,0 +1,150 @@
+import shutil
+from pathlib import Path
+
+import pytest
+from fontTools.designspaceLib import DesignSpaceDocument
+from fontTools.designspaceLib.split import splitInterpolable, splitVariableFonts, convert5to4
+
+from .fixtures import datadir
+
+UPDATE_REFERENCE_OUT_FILES_INSTEAD_OF_TESTING = False
+
+
+@pytest.mark.parametrize(
+    "test_ds,expected_interpolable_spaces",
+    [
+        (
+            "test_v5_aktiv.designspace",
+            [
+                (
+                    {},
+                    {
+                        "AktivGroteskVF_Italics_Wght",
+                        "AktivGroteskVF_Italics_WghtWdth",
+                        "AktivGroteskVF_Wght",
+                        "AktivGroteskVF_WghtWdth",
+                        "AktivGroteskVF_WghtWdthItal",
+                    },
+                )
+            ],
+        ),
+        (
+            "test_v5_sourceserif.designspace",
+            [
+                (
+                    {"italic": 0},
+                    {"SourceSerif4Variable-Roman"},
+                ),
+                (
+                    {"italic": 1},
+                    {"SourceSerif4Variable-Italic"},
+                ),
+            ],
+        ),
+        (
+            "test_v5_MutatorSans_and_Serif.designspace",
+            [
+                (
+                    {"serif": 0},
+                    {
+                        "MutatorSansVariable_Weight_Width",
+                        "MutatorSansVariable_Weight",
+                        "MutatorSansVariable_Width",
+                    },
+                ),
+                (
+                    {"serif": 1},
+                    {
+                        "MutatorSerifVariable_Width",
+                    },
+                ),
+            ],
+        ),
+    ],
+)
+def test_split(datadir, tmpdir, test_ds, expected_interpolable_spaces):
+    data_in = datadir / test_ds
+    temp_in = Path(tmpdir) / test_ds
+    shutil.copy(data_in, temp_in)
+    doc = DesignSpaceDocument.fromfile(temp_in)
+
+    for i, (location, sub_doc) in enumerate(splitInterpolable(doc)):
+        expected_location, expected_vf_names = expected_interpolable_spaces[i]
+        assert location == expected_location
+        vfs = list(splitVariableFonts(sub_doc))
+        assert expected_vf_names == set(vf[0] for vf in vfs)
+
+        loc_str = "_".join(f"{name}_{value}"for name, value in sorted(location.items()))
+        data_out = datadir / "split_output" / f"{temp_in.stem}_{loc_str}.designspace"
+        temp_out = Path(tmpdir) / "out" / f"{temp_in.stem}_{loc_str}.designspace"
+        temp_out.parent.mkdir(exist_ok=True)
+        sub_doc.write(temp_out)
+
+        if UPDATE_REFERENCE_OUT_FILES_INSTEAD_OF_TESTING:
+            data_out.write_text(temp_out.read_text(encoding="utf-8"), encoding="utf-8")
+        else:
+            assert data_out.read_text(encoding="utf-8") == temp_out.read_text(
+                encoding="utf-8"
+            )
+
+        for vf_name, vf_doc in vfs:
+            data_out = (datadir / "split_output" / vf_name).with_suffix(".designspace")
+            temp_out = (Path(tmpdir) / "out" / vf_name).with_suffix(".designspace")
+            temp_out.parent.mkdir(exist_ok=True)
+            vf_doc.write(temp_out)
+
+            if UPDATE_REFERENCE_OUT_FILES_INSTEAD_OF_TESTING:
+                data_out.write_text(
+                    temp_out.read_text(encoding="utf-8"), encoding="utf-8"
+                )
+            else:
+                assert data_out.read_text(encoding="utf-8") == temp_out.read_text(
+                    encoding="utf-8"
+                )
+
+
+
+
+@pytest.mark.parametrize(
+    "test_ds,expected_vfs",
+    [
+        (
+            "test_v5_aktiv.designspace",
+            {
+                "AktivGroteskVF_Italics_Wght",
+                "AktivGroteskVF_Italics_WghtWdth",
+                "AktivGroteskVF_Wght",
+                "AktivGroteskVF_WghtWdth",
+                "AktivGroteskVF_WghtWdthItal",
+            },
+        ),
+        (
+            "test_v5_sourceserif.designspace",
+            {
+                "SourceSerif4Variable-Italic",
+                "SourceSerif4Variable-Roman",
+            },
+        ),
+    ],
+)
+def test_convert5to4(datadir, tmpdir, test_ds, expected_vfs):
+    data_in = datadir / test_ds
+    temp_in = tmpdir / test_ds
+    shutil.copy(data_in, temp_in)
+    doc = DesignSpaceDocument.fromfile(temp_in)
+
+    variable_fonts = convert5to4(doc)
+
+    assert variable_fonts.keys() == expected_vfs
+    for vf_name, vf in variable_fonts.items():
+        data_out = (datadir / "convert5to4_output" / vf_name).with_suffix(".designspace")
+        temp_out = (Path(tmpdir) / "out" / vf_name).with_suffix(".designspace")
+        temp_out.parent.mkdir(exist_ok=True)
+        vf.write(temp_out)
+
+        if UPDATE_REFERENCE_OUT_FILES_INSTEAD_OF_TESTING:
+            data_out.write_text(temp_out.read_text(encoding="utf-8"), encoding="utf-8")
+        else:
+            assert data_out.read_text(encoding="utf-8") == temp_out.read_text(
+                encoding="utf-8"
+            )

Tests/designspaceLib/statNames_test.py

@@ -0,0 +1,61 @@
+from fontTools.designspaceLib import DesignSpaceDocument
+from fontTools.designspaceLib.statNames import StatNames, getStatNames
+
+from .fixtures import datadir
+
+
+def test_instance_getStatNames(datadir):
+    doc = DesignSpaceDocument.fromfile(datadir / "test_v5_sourceserif.designspace")
+
+    assert getStatNames(doc, doc.instances[0].getFullUserLocation(doc)) == StatNames(
+        familyNames={"en": "Source Serif 4"},
+        styleNames={"en": "Caption ExtraLight"},
+        postScriptFontName="SourceSerif4-CaptionExtraLight",
+        styleMapFamilyNames={"en": "Source Serif 4 Caption ExtraLight"},
+        styleMapStyleName="regular",
+    )
+
+
+def test_not_all_ordering_specified_and_translations(datadir):
+    doc = DesignSpaceDocument.fromfile(datadir / "test_v5.designspace")
+
+    assert getStatNames(doc, {"weight": 200, "width": 125, "Italic": 1}) == StatNames(
+        familyNames={
+            "en": "MasterFamilyName",
+            "fr": "Montserrat",
+            "ja": "モンセラート",
+        },
+        styleNames={
+            "fr": "Wide Extra léger Italic",
+            "de": "Wide Extraleicht Italic",
+            "en": "Wide Extra Light Italic",
+        },
+        postScriptFontName="MasterFamilyName-WideExtraLightItalic",
+        styleMapFamilyNames={
+            "en": "MasterFamilyName Wide Extra Light",
+            "fr": "Montserrat Wide Extra léger",
+            "de": "MasterFamilyName Wide Extraleicht",
+            "ja": "モンセラート Wide Extra Light",
+        },
+        styleMapStyleName="italic",
+    )
+
+
+def test_detect_ribbi_aktiv(datadir):
+    doc = DesignSpaceDocument.fromfile(datadir / "test_v5_aktiv.designspace")
+
+    assert getStatNames(doc, {"Weight": 600, "Width": 125, "Italic": 1}) == StatNames(
+        familyNames={"en": "Aktiv Grotesk"},
+        styleNames={"en": "Ex SemiBold Italic"},
+        postScriptFontName="AktivGrotesk-ExSemiBoldItalic",
+        styleMapFamilyNames={"en": "Aktiv Grotesk Ex SemiBold"},
+        styleMapStyleName="italic",
+    )
+
+    assert getStatNames(doc, {"Weight": 700, "Width": 75, "Italic": 1}) == StatNames(
+        familyNames={"en": "Aktiv Grotesk"},
+        styleNames={"en": "Cd Bold Italic"},
+        postScriptFontName="AktivGrotesk-CdBoldItalic",
+        styleMapFamilyNames={"en": "Aktiv Grotesk Cd"},
+        styleMapStyleName="bold italic",
+    )

Tests/varLib/stat_test.py

@@ -0,0 +1,167 @@
+from pathlib import Path
+
+import pytest
+from fontTools.designspaceLib import DesignSpaceDocument
+from fontTools.designspaceLib.split import Range
+from fontTools.varLib.stat import getStatAxes, getStatLocations
+
+
+@pytest.fixture
+def datadir():
+    return Path(__file__).parent / "../designspaceLib/data"
+
+
+def test_getStatAxes(datadir):
+    doc = DesignSpaceDocument.fromfile(datadir / "test_v5.designspace")
+
+    assert getStatAxes(
+        doc, {"Italic": 0, "width": Range(50, 150), "weight": Range(200, 900)}
+    ) == [
+        {
+            "values": [
+                {
+                    "flags": 0,
+                    "name": {
+                        "de": "Extraleicht",
+                        "en": "Extra Light",
+                        "fr": "Extra léger",
+                    },
+                    "nominalValue": 200.0,
+                    "rangeMaxValue": 250.0,
+                    "rangeMinValue": 200.0,
+                },
+                {
+                    "flags": 0,
+                    "name": {"en": "Light"},
+                    "nominalValue": 300.0,
+                    "rangeMaxValue": 350.0,
+                    "rangeMinValue": 250.0,
+                },
+                {
+                    "flags": 2,
+                    "name": {"en": "Regular"},
+                    "nominalValue": 400.0,
+                    "rangeMaxValue": 450.0,
+                    "rangeMinValue": 350.0,
+                },
+                {
+                    "flags": 0,
+                    "name": {"en": "Semi Bold"},
+                    "nominalValue": 600.0,
+                    "rangeMaxValue": 650.0,
+                    "rangeMinValue": 450.0,
+                },
+                {
+                    "flags": 0,
+                    "name": {"en": "Bold"},
+                    "nominalValue": 700.0,
+                    "rangeMaxValue": 850.0,
+                    "rangeMinValue": 650.0,
+                },
+                {
+                    "flags": 0,
+                    "name": {"en": "Black"},
+                    "nominalValue": 900.0,
+                    "rangeMaxValue": 900.0,
+                    "rangeMinValue": 850.0,
+                },
+            ],
+            "name": {"en": "Wéíght", "fa-IR": "قطر"},
+            "ordering": 2,
+            "tag": "wght",
+        },
+        {
+            "values": [
+                {"flags": 0, "name": {"en": "Condensed"}, "value": 50.0},
+                {"flags": 3, "name": {"en": "Normal"}, "value": 100.0},
+                {"flags": 0, "name": {"en": "Wide"}, "value": 125.0},
+                {
+                    "flags": 0,
+                    "name": {"en": "Extra Wide"},
+                    "nominalValue": 150.0,
+                    "rangeMinValue": 150.0,
+                },
+            ],
+            "name": {"en": "width", "fr": "Chasse"},
+            "ordering": 1,
+            "tag": "wdth",
+        },
+        {
+            "values": [
+                {"flags": 2, "linkedValue": 1.0, "name": {"en": "Roman"}, "value": 0.0},
+            ],
+            "name": {"en": "Italic"},
+            "ordering": 3,
+            "tag": "ital",
+        },
+    ]
+
+    assert getStatAxes(doc, {"Italic": 1, "width": 100, "weight": Range(400, 700)}) == [
+        {
+            "values": [
+                {
+                    "flags": 2,
+                    "name": {"en": "Regular"},
+                    "nominalValue": 400.0,
+                    "rangeMaxValue": 450.0,
+                    "rangeMinValue": 350.0,
+                },
+                {
+                    "flags": 0,
+                    "name": {"en": "Semi Bold"},
+                    "nominalValue": 600.0,
+                    "rangeMaxValue": 650.0,
+                    "rangeMinValue": 450.0,
+                },
+                {
+                    "flags": 0,
+                    "name": {"en": "Bold"},
+                    "nominalValue": 700.0,
+                    "rangeMaxValue": 850.0,
+                    "rangeMinValue": 650.0,
+                },
+            ],
+            "name": {"en": "Wéíght", "fa-IR": "قطر"},
+            "ordering": 2,
+            "tag": "wght",
+        },
+        {
+            "values": [
+                {"flags": 3, "name": {"en": "Normal"}, "value": 100.0},
+            ],
+            "name": {"en": "width", "fr": "Chasse"},
+            "ordering": 1,
+            "tag": "wdth",
+        },
+        {
+            "values": [
+                {"flags": 0, "name": {"en": "Italic"}, "value": 1.0},
+            ],
+            "name": {"en": "Italic"},
+            "ordering": 3,
+            "tag": "ital",
+        },
+    ]
+
+
+def test_getStatLocations(datadir):
+    doc = DesignSpaceDocument.fromfile(datadir / "test_v5.designspace")
+
+    assert getStatLocations(
+        doc, {"Italic": 0, "width": Range(50, 150), "weight": Range(200, 900)}
+    ) == [
+        {
+            "flags": 0,
+            "location": {"ital": 0.0, "wdth": 50.0, "wght": 300.0},
+            "name": {"en": "Some Style", "fr": "Un Style"},
+        },
+    ]
+    assert getStatLocations(
+        doc, {"Italic": 1, "width": Range(50, 150), "weight": Range(200, 900)}
+    ) == [
+        {
+            "flags": 0,
+            "location": {"ital": 1.0, "wdth": 100.0, "wght": 700.0},
+            "name": {"en": "Other"},
+        },
+    ]