From: John Jenkins (firstname.lastname@example.org)
Date: Wed Apr 28 2004 - 17:55:14 EDT
On Apr 28, 2004, at 2:19 PM, John Hudson wrote:
> The only interaction between glyphs in a font and character codes in
> text is via mapping (which is done either internally or externally,
> depending on the font format). Fonts do not contain any character
> information other than which glyphs corrrespond to which characters.
> All other information in the font is glyph-centric; e.g. ligature and
> other substitution lookups map glyphs to glyphs, not characters to
> glyphs. Trying to introduce character properties into such a
> glyph-centric architecture would be, at best, an awkward fit.
FWIW, AAT includes an optional 'prop' table which allows people to
associate a number of Unicode properties -- most notably directionality
-- with specific glyphs in a font. It *is* a little weird to do this,
as John says, but it's there.
John H. Jenkins
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