From: Philippe Verdy (verdy_p@wanadoo.fr)
Date: Wed Dec 17 2003 - 18:00:22 EST
Chris Jacobs writes:
> > >To display a dot, one can use one of the four canonical eqquivalents:
> > > <LATIN CAPITAL LETTER I WITH DOT ABOVE, COMBINING CIRCUMFLEX>
> > > <LATIN CAPITAL LETTER I WITH CIRCUMFLEX, COMBINING DOT ABOVE>
> > > <LATIN CAPITAL LETTER I, COMBINING DOT ABOVE, COMBINING CIRCUMFLEX>
> > > <LATIN CAPITAL LETTER I, COMBINING CIRCUMFLEX, COMBINING DOT ABOVE>
> > >(one is the NFC form, another is the NFD form, two others are also
> > >possible)
>
> Those four are not all canonical equivalent since circumflex and dot above
> are both combining class 230, so they interact.
This allows me to make a small digression here for the presentation form of
a dot below the circumflex: Should it really be below it or in the middle of
the circumflex?
If there's no difference, then what is the difference with the "combining
Latin candrabindu" (used to transliterate Indic scripts to Latin), and a
"combining breve" below a "combining dot above", which also interact at the
same position?
Look then at the case where the Latin candrabindu is applied above a
lowercase soft-dotted i or j...
If the separate circumflex should not freely enclose the separate dot (the
difference applies), then it will need a new codification for the case where
they interact more intimately, or to use CGJ between them to create a
ligature of combining marks having the same combining class???
Ohhh... I admit this is hypothetic for a possible use, but the candrabindu
case is a precedent coming from romanization of non-Latin scripts: what if
there's a combining x above used to interact over a diacritic and mark its
suppression in corrected texts or in documents related to
orthographic/grammatical rules, or simply because it is needed for correct
romanization of some ancient script...
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