Re: Contrastive use of kratka and breve

From: Leo Broukhis <>
Date: Wed, 2 Jul 2014 11:48:06 -0700


If the font happens to have lunar breve at U+0306, whereas the letter й has
the rounded bowl breve, using CGJ should guarantee to achieve distinctive
rendering, because <и, CGJ, U+0306> is not canonically equivalent to <и,
U+0306> (cf. "The sequences <a, umlaut> and <a, CGJ, umlaut> are not
canonically equivalent.") and therefore the renderer must not be allowed to
pick the glyph for й instead as its canonical composition. This is a hack,
but a legal hack.


On Wed, Jul 2, 2014 at 11:13 AM, Jukka K. Korpela <>

> 2014-07-02 20:34, Philippe Verdy wrote:
> CGJ would be better used to prevent canonical compositions but it won't
>> normally give a distinctive semantic.
> In the question, visual difference was desired. The Unicode FAQ says:
> “The semantics of CGJ are such that it should impact only searching and
> sorting, for systems which have been tailored to distinguish it, while
> being otherwise ignored in interpretation. The CGJ character was encoded
> with this purpose in mind.”
> So CGJ is to be used when you specifically want the same rendering but
> wish to make a distinction in processing.
> Yucca
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