From: Philippe Verdy (verdy_p@wanadoo.fr)
Date: Thu Apr 14 2005 - 16:38:15 CST
From: <Lorna_Priest@sil.org>
To: <unicode@unicode.org>
Sent: Thursday, April 14, 2005 11:06 PM
Subject: COMBINING DOUBLE INVERTED BREVE
> Two questions about the double-width diacritics such as U+0361 COMBINING
> DOUBLE INVERTED BREV:
>
> 1) What is the correct way to encode an acute accent (U+0301) *above* a
> COMBINING DOUBLE INVERTED BREVE (U+0361)? See, for example,
> http://scripts.sil.org/cms/sites/nrsi/media/AcuteOver0361.png
Isn't this a *double* acute over a double inverted breve?
> In particular, is this an appropriate use of the new (4.1) semantics of
> CGJ (U+034F) between combining marks, e.g:
>
> U+0061 U+0361 U+034F U+0301 U+0065
CGJ seems appropriate, because the double inverted breve U+0361 (liaison) is
supposed to be encoded between the two sub-graphemes it links, and displayed
above both of them. If you encode an acute U+0301, its combining class 230
will be lower than the combining class of the double inverted breve (234),
so without CGJ, the string:
U+0061 U+0361 U+0301 U+0065
would become canonically equivalent to its normalized form:
U+0061 U+0301 U+0361 U+0065
which can be recomposed in NFC form as:
U+00E1 U+0361 U+0065
and so it would mean an 'á', followed by 'e', and linked by the combining
"double inverted breve" (what a bad name for what is really a linking mark!)
above them.
As you want to avoid that reordering where the accent is moved below the
inverted breve, CGJ is there to block accents reordering in normalized
forms, and to keep the expected semantic.
The problem is that I am not sure that this is a normal acute accent. May be
this is a double-wide acute accent (sorry for the name but there's also a
"double acute" accent, where double means "repeated twice side-by-side")
which may be encoded separately, with the combining class 234, and for which
no CGJ would be needed (additionaly, it would be possible to put this accent
above two letters without the double-wide inverted breve.
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