fonttools/Lib/fontTools/feaLib/testdata/spec8a.ttx

<?xml version="1.0" encoding="UTF-8"?>
<ttFont>

  <GSUB>
    <Version value="1.0"/>
    <ScriptList>
      <!-- ScriptCount=3 -->
      <ScriptRecord index="0">
        <ScriptTag value="DFLT"/>
        <Script>
          <DefaultLangSys>
            <ReqFeatureIndex value="65535"/>
            <!-- FeatureCount=3 -->
            <FeatureIndex index="0" value="0"/>
            <FeatureIndex index="1" value="1"/>
            <FeatureIndex index="2" value="2"/>
          </DefaultLangSys>
          <!-- LangSysCount=0 -->
        </Script>
      </ScriptRecord>
      <ScriptRecord index="1">
        <ScriptTag value="cyrl"/>
        <Script>
          <DefaultLangSys>
            <ReqFeatureIndex value="65535"/>
            <!-- FeatureCount=3 -->
            <FeatureIndex index="0" value="0"/>
            <FeatureIndex index="1" value="1"/>
            <FeatureIndex index="2" value="2"/>
          </DefaultLangSys>
          <!-- LangSysCount=0 -->
        </Script>
      </ScriptRecord>
      <ScriptRecord index="2">
        <ScriptTag value="latn"/>
        <Script>
          <DefaultLangSys>
            <ReqFeatureIndex value="65535"/>
            <!-- FeatureCount=3 -->
            <FeatureIndex index="0" value="0"/>
            <FeatureIndex index="1" value="1"/>
            <FeatureIndex index="2" value="2"/>
          </DefaultLangSys>
          <!-- LangSysCount=1 -->
          <LangSysRecord index="0">
            <LangSysTag value="TRK "/>
            <LangSys>
              <ReqFeatureIndex value="65535"/>
              <!-- FeatureCount=3 -->
              <FeatureIndex index="0" value="0"/>
              <FeatureIndex index="1" value="1"/>
              <FeatureIndex index="2" value="2"/>
            </LangSys>
          </LangSysRecord>
        </Script>
      </ScriptRecord>
    </ScriptList>
    <FeatureList>
      <!-- FeatureCount=3 -->
      <FeatureRecord index="0">
        <FeatureTag value="aalt"/>
        <Feature>
          <!-- LookupCount=2 -->
          <LookupListIndex index="0" value="0"/>
          <LookupListIndex index="1" value="1"/>
        </Feature>
      </FeatureRecord>
      <FeatureRecord index="1">
        <FeatureTag value="salt"/>
        <Feature>
          <!-- LookupCount=3 -->
          <LookupListIndex index="0" value="5"/>
          <LookupListIndex index="1" value="7"/>
          <LookupListIndex index="2" value="8"/>
        </Feature>
      </FeatureRecord>
      <FeatureRecord index="2">
        <FeatureTag value="smcp"/>
        <Feature>
          <!-- LookupCount=2 -->
          <LookupListIndex index="0" value="3"/>
          <LookupListIndex index="1" value="4"/>
        </Feature>
      </FeatureRecord>
    </FeatureList>
    <LookupList>
      <!-- LookupCount=9 -->
      <Lookup index="0">
        <!-- LookupType=1 -->
        <LookupFlag value="0"/>
        <!-- SubTableCount=1 -->
        <SingleSubst index="0">
          <Substitution in="e" out="e.mid"/>
        </SingleSubst>
      </Lookup>
      <Lookup index="1">
        <!-- LookupType=2 -->
        <LookupFlag value="0"/>
        <!-- SubTableCount=1 -->
        <MultipleSubst index="0">
          <Substitution in="a" out="A.sc,a.alt1,a.alt2,a.alt3"/>
          <Substitution in="b" out="B.sc,b.alt"/>
          <Substitution in="c" out="C.sc,c.mid"/>
          <Substitution in="d" out="d.alt,d.mid"/>
        </MultipleSubst>
      </Lookup>
      <Lookup index="2">
        <!-- LookupType=1 -->
        <LookupFlag value="0"/>
        <!-- SubTableCount=1 -->
        <SingleSubst index="0">
          <Substitution in="d" out="d.alt"/>
        </SingleSubst>
      </Lookup>
      <Lookup index="3">
        <!-- LookupType=1 -->
        <LookupFlag value="0"/>
        <!-- SubTableCount=1 -->
        <SingleSubst index="0">
          <Substitution in="a" out="A.sc"/>
          <Substitution in="b" out="B.sc"/>
          <Substitution in="c" out="C.sc"/>
        </SingleSubst>
      </Lookup>
      <Lookup index="4">
        <!-- LookupType=4 -->
        <LookupFlag value="0"/>
        <!-- SubTableCount=1 -->
        <LigatureSubst index="0" Format="1">
          <LigatureSet glyph="f">
            <Ligature components="i" glyph="f_i"/>
          </LigatureSet>
        </LigatureSubst>
      </Lookup>
      <Lookup index="5">
        <!-- LookupType=3 -->
        <LookupFlag value="0"/>
        <!-- SubTableCount=1 -->
        <AlternateSubst index="0" Format="1">
          <AlternateSet glyph="a">
            <Alternate glyph="a.alt1"/>
            <Alternate glyph="a.alt2"/>
            <Alternate glyph="a.alt3"/>
          </AlternateSet>
        </AlternateSubst>
      </Lookup>
      <Lookup index="6">
        <!-- LookupType=1 -->
        <LookupFlag value="0"/>
        <!-- SubTableCount=1 -->
        <SingleSubst index="0">
          <Substitution in="c" out="c.mid"/>
          <Substitution in="d" out="d.mid"/>
          <Substitution in="e" out="e.mid"/>
        </SingleSubst>
      </Lookup>
      <Lookup index="7">
        <!-- LookupType=6 -->
        <LookupFlag value="0"/>
        <!-- SubTableCount=1 -->
        <ChainContextSubst index="0" Format="3">
          <!-- BacktrackGlyphCount=1 -->
          <BacktrackCoverage index="0">
            <Glyph value="e"/>
          </BacktrackCoverage>
          <!-- InputGlyphCount=1 -->
          <InputCoverage index="0">
            <Glyph value="c"/>
            <Glyph value="d"/>
            <Glyph value="e"/>
          </InputCoverage>
          <!-- LookAheadGlyphCount=1 -->
          <LookAheadCoverage index="0">
            <Glyph value="f"/>
          </LookAheadCoverage>
          <!-- SubstCount=1 -->
          <SubstLookupRecord index="0">
            <SequenceIndex value="0"/>
            <LookupListIndex value="6"/>
          </SubstLookupRecord>
        </ChainContextSubst>
      </Lookup>
      <Lookup index="8">
        <!-- LookupType=1 -->
        <LookupFlag value="0"/>
        <!-- SubTableCount=1 -->
        <SingleSubst index="0">
          <Substitution in="b" out="b.alt"/>
        </SingleSubst>
      </Lookup>
    </LookupList>
  </GSUB>

</ttFont>