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Graphite features

Unlike OpenType and AAT, Graphites advanced font-feature support does not stem from a pre-defined list of possible features. Instead, font developers can define and name features in any manner they wish.

This does constitute a bit of a practical challenge for application developers, but because the Graphite-enabled fonts most likely to be encountered are those from SIL, any potential for confusion can be averted by taking a look at the Graphite features SIL implements.

SIL maintains a list of feature definitions on its site that covers the feature set used by the Andika, Charis, Doulos, and Gentium font familes.

Originally, SIL's font families used numeric IDs to identify each feature. As of the 5.000 releases in 2014, however, the features all use four-character alphabetic IDs, many of which correspond directly to the equivalent OpenType feature.

The following list includes the features with an OpenType equivalent; the corresponding OpenType feature tag is listed in italics. The old, numeric IDs for the Graphite features are in parentheses. Further down is a list of those Graphite features that do not have an OpenType analogue.

  • apos cv70 (formerly 1044) Modifier apostrophe alternates
  • B_hk cv13 (formerly 1064) Capital B-hook alternate
  • bowl ss04 (formerly 1031) Barred-bowl forms
  • brig (formerly 1052) Bridging diacritics
  • carn cv77 (formerly 1063) Non-European caron alternates
  • chtn cv90 (formerly 1057) Chinantec toens
  • coln cv71 (formerly 1047) Modifier colon alternate
  • dg69 cv06 (formerly 1068) Digit six and nine alternates
  • D_hk cv17 Capital D-hook alternate
  • dig0 cv10 (formerly 1065) Digit zero with slash
  • dig1 cv01 (formerly 1066) Digit one without base
  • dig4 cv04 (formerly 1067) Digit four with open top
  • dig7 cv07 (formerly 1069) Digit seven with bar
  • empt cv98 (formerly 1046) Empty set alternates
  • Engs cv43 (formerly 1024) Uppercase Eng alternates
  • 0 Large eng with descender
  • 1 Large eng on baseline
  • 2 Capital N with tail
  • 3 Large eng with short stem
  • ezhc cv19 (formerly 1036) Small ezh-curl alternate
  • Ezhr cv20 (formerly 1042) Capital Ezh alternates
  • Hstk cv28 (formerly 1038) Capital H-stroke alternate
  • invs ss06 (formerly 1030) Show invisible characters
  • ital ss05 (formerly 1053) Slant italic specials
  • i_tl cv31 (formerly 1070) Small i-tail alternate
  • jser cv34 (formerly 1071) Small j-serif alternate
  • Jstk cv37 (formerly 1049) J-stroke hook alternate
  • litr ss01 (formerly 1032) Literacy alternates
  • l_tl cv39 (formerly 1072) Small l-tail alternate
  • mone cv80 (formerly 1027) Mongolian-style Cyrillic E
  • N_hk cv44 (formerly 1035) Capital N-left-hook alternate
  • ogon cv76 (formerly 1043) Ogonek alternate
  • opnO cv46 (formerly 1059) Open-O alternate
  • opOU cv47 (formerly 1045) OU alternates
  • p_hk cv49 (formerly 1040) Small p-hook alternate
  • pit9 (formerly 1062) 9-level pitches
  • Qalt cv52 (formerly 1076) Capital Q alternate
  • q_tl cv51 (formerly 1073) Small q-tail alternate
  • ramh cv25 (formerly 1025) Rams horn alternates
  • 0 Small bowl
  • 1 Large bowl
  • 2 Small gamma
  • R_tl cv55 (formerly 1039) Capital R-tail alternate
  • sbrv cv82 (formerly 1028) Combining breve Cyrillic form
  • serb locl Serbian-style alternates
  • shha cv81 (formerly 1056) Cyrillic shha alternate
  • smcp smcp,c2sc (formerly 1058) Small caps
  • t_hk cv57 (formerly 1037) Capital T-hook alternate
  • tone cv91 (formerly 1026) Tone numbers
  • tstv cv92 (formerly 1050, formerly) Hide contour staves
  • t_tl cv56 (formerly 1074) Small t-tail alternate
  • v_hk cv62 (formerly 1033) V-hook alternates
  • 0 Curved
  • 1 Straight with low hook
  • 2 Straight with high hook
  • viet cv75 (formerly 1029) Vietnamese-style diacritics
  • Y_hk cv68 (formerly 1034) Capital Y-hook alternates
  • y_tl cv67 (formerly 1075) Small y-tail alternate

Graphite features currently without an OpenType feature equivalent

  • brig (formerly 1052) Bridging diacritics

  • pit9 (formerly 1062) 9-level pitches

  • 0 No tramlines

  • 1 Tramlines

  • 2 Non-ligated with no tramlines

  • 3 Non-ligated with tramlines

  • 1048 Orthographic glottal alternate, deprecated

  • beta (formerly 1060) Serif beta alternate, deprecated

  • dpua (formerly 1077) Show deprecated PUA, deprecated

  • dsel (formerly 1051) Diacritic selection, deprecated

  • lopr (formerly 1054) Low-profile diacritics, deprecated

  • romn (formerly 1041) Romanian-style diacritics, deprecated