Re: 28th IUC paper - Tamil Unicode New

From: John Hudson (
Date: Mon Aug 22 2005 - 18:18:51 CDT

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    Philippe Verdy wrote:

    > A refined model would encode special features that give the effective
    > semantics of glyph IDs before the GSUB features are applied ...

    This is what the Apple 'prop' table does. It allows character-like properties e.g.
    directionality, to be assigned to any glyph, regardless of its encoding. I can't imagine
    that there are more than a few dozen fonts in the world that actually contain 'prop'
    tables, if that many, and most of them were probably made at Apple. I'm not aware of any
    significant applications that make use of this technology, but presumably it is available,
    via AAT to any Cocoa app under Mac OS X. I don't believe any interest has been shown in
    the 'prop' table outside of Apple; it has not been adopted by Microsoft or Adobe in their
    extensions of the TT specification.

    John Hudson

    Tiro Typeworks
    Vancouver, BC
    Currently reading:
    Lords of the horizons, by Jason Goodwin
    Dining on stone, by Iain Sinclair

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