# OpenType Feature File specification, section 5.d, example 1.
# http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html

feature F1 {
  sub [one one.oldstyle] [slash fraction] [two two.oldstyle] by onehalf;
} F1;

# Since the OpenType specification does not allow ligature substitutions
# to be specified on target sequences that contain glyph classes, the
# implementation software will enumerate all specific glyph sequences
# if glyph classes are detected in <glyph sequence>.  Thus, the above
# example produces an identical representation in the font as if all
# the sequences were manually enumerated by the font editor:
feature F2 {
  sub one slash two by onehalf;
  sub one.oldstyle slash two by onehalf;
  sub one fraction two by onehalf;
  sub one.oldstyle fraction two by onehalf;
  sub one slash two.oldstyle by onehalf;
  sub one.oldstyle slash two.oldstyle by onehalf;
  sub one fraction two.oldstyle by onehalf;
  sub one.oldstyle fraction two.oldstyle by onehalf;
} F2;