Re: Questions about diacritics

From: Philippe Verdy (
Date: Mon Sep 13 2004 - 11:18:17 CDT

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    From: "Peter Kirk" <>
    > 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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