[MPEG-OTSPEC] Direct variable font support in Adobe OpenType Feature Files: Change review

[Skef Iterum]

Hello—I hope everyone can forgive a slight abuse of this list ...

The Adobe Type Team has been working to extend the OpenType Feature File 
Specification to add direct support for Variable fonts. We are 
introducing the specification changes in two stages:

   *  Stage 1 adds support for variable values
   *  Stage 2 will add support for feature variations (such as swapping
    one glyph for another based on axis range conditions)

The stage 1 changes are now in a public review period that will end 
January 15th 2025. The review repository is:

https://github.com/adobe-type-tools/feature_file_change_review/

Any further discussion of this topic should of course happen in that 
repository, as the Feature File Specification and the Open Font Format 
specification are only loosely related.

Feature files are used in the development of many fonts, sometimes 
directly and sometimes "under the hood". We expect these changes will be 
of most interest to tool developers and designers of fonts with 
extensive or unusual GSUB or GPOS features. The top-level README of the 
review repository has more information on the review process and 
guidance on whether and how you may want to participate.

I will be rolling out the announcement of this review across other 
channels over the next few days.

Thanks,

Skef Iterum
Adobe Inc.
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