This feature type gives a font a very general way to provide different sets of glyphs. Sets are numbered sequentially. For a font that supports the character alternates feature type, you can select by number any of the sets it provides.
For example, a font with 20 ampersands could place them in 20 selectors under this feature type. In general, however, named glyph sets provided through the kCharacterAlternativesType feature type are preferable. Table D-3 lists the only defined selector for this feature.
Table D-3 Feature selectors for the kCharacterAlternativesType feature type
Constant
Explanation
kNoAlternatesSelector
Specifies the use of no character alternatives. This is the first (default) setting for this feature type; others are specified by number only.
