From: Philippe Verdy (verdy_p@wanadoo.fr)
Date: Mon Sep 13 2004 - 11:18:17 CDT
From: "Peter Kirk" <peterkirk@qaya.org>
> Surely the intention is for <INVISIBLE LETTER, combining acute> to be
> equivalent (although it cannot be canonically equivalent) to spacing
> acute, U+00B4? But then would this kind of ligature mechanism with ZWNJ
> and U+00B4 be appropriate? I would think not.
<INVISIBLE LETTER,combining acute> will not be canonically equivalent
effectively, depite it should produce and behave like the spacing acute.
As ZWJ is intended to indicate that there's effectively a ligature
opportunity between two grapheme clusters, I don't see why one would not
support <a,ZWJ,SPACING ACUTE> to kern the spacing acute on the right side of
a. It won't create an accent *centered* above the letter, but it now allows
the accent to move within the spacing area of the preceding letter.
I accept the fact that this is just a ligature opportunity for renderers,
with no different semantics than in absence of the joiner. But I wonder if
the digraph with the centered accent above is not simply that: the accent is
a notation that does not change the semantics of the surrounding two vowels,
with no orthographic consideration.
In that case, this is really a rendering feature, and using ZWJ could be
appropriate here, notably because <IL,combining acute> will remain
canonically distinct from U+00B4, which also has the wrong character
properties (not a letter, this is a symbol and a word-breaker by itself...).
Most uses of isolated diacritics however are mainly symbolic rather than
orthographic. The IL however changes this, and becomes appropriate within
the middle of words.
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