[OpenType] RE: Proposal: deprecate ReqFeatureIndex

[John Hudson]

Peter Constable wrote:

> If we defined a feature tag 'reqd' and used it to group a set of lookups and then referenced it from ReqFeatureIndex, that could work fine -- for one langsys table. If you needed to trigger a _different_ set of required lookups for some other language system, then that doesn't help.

There doesn't seem to be anything that would prevent one from defining 
in a font a required feature for each language system that needed one 
(one could even use the language system tag names, since there is no 
requirement that script, language system and feature tags be mutually 
exclusive). A required feature is just a hold-all for required lookups 
to be associated with this or that language system.

JH


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