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

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

  <GDEF>
    <Version value="1.0"/>
    <LigCaretList>
      <Coverage>
        <Glyph value="c_h"/>
        <Glyph value="c_k"/>
        <Glyph value="o_f_f_i"/>
      </Coverage>
      <!-- LigGlyphCount=3 -->
      <LigGlyph index="0">
        <!-- CaretCount=1 -->
        <CaretValue index="0" Format="1">
          <Coordinate value="500"/>
        </CaretValue>
      </LigGlyph>
      <LigGlyph index="1">
        <!-- CaretCount=1 -->
        <CaretValue index="0" Format="1">
          <Coordinate value="500"/>
        </CaretValue>
      </LigGlyph>
      <LigGlyph index="2">
        <!-- CaretCount=3 -->
        <CaretValue index="0" Format="1">
          <Coordinate value="300"/>
        </CaretValue>
        <CaretValue index="1" Format="1">
          <Coordinate value="700"/>
        </CaretValue>
        <CaretValue index="2" Format="1">
          <Coordinate value="900"/>
        </CaretValue>
      </LigGlyph>
    </LigCaretList>
  </GDEF>

</ttFont>