From: Philippe Verdy (firstname.lastname@example.org)
Date: Mon Jul 09 2007 - 21:45:47 CDT
Peter Constable wrote:
> Maybe you think a rendering implementation needs to re-order an Indic
> vowel mark around an Arabic base letter; but my thought is that the
> behavior for that kind of character interaction is simply not defined, and
> I don't know of any user that would need it anyway, so this is a bit of a
> pipe dream.
That's my opinion too.
So the Latin letter "x" should not be used for such interactions in Lao. It
should only be instead a simple symbol, within the "Common" script, with a
"S*" general category, directionally NEUTRAL, NOT mirrored (excluding arrows
and parenthese-like punctuations), WITHOUT any case mapping, and NOT a
decomposable compatibility character (like the squared letter-like symbols).
There should be absolutely no special effect within normalizations, and with
joining types. For full-text searching, such symbol should be ignorable
using appropriate collation tuning (so, searching for Lao vowels should be
possible using collation rules tuning that make symbols ignorable or treated
The symbol should also not be forming any ligation with nearby characters
(so this should exclude box drawing symbols like the thin diagonal cross
U+2573), and its glyph should not be context dependant (changed, positioned
or resized according to modifiers). It should not break a single-script
sentence within word breakers or line breakers, but treated like a word by
I may have forgotten other conditions for the simplest symbols (like the
dotted circle symbol or the mathematical multiplication sign "×") suitable
for such use as a placeholder for a missing Lao consonnant. But using a
Latin letter "x" is the worst option, given its many interactions.
Candidate cross-like symbols that I can see suitable for such Lao use are:
- U+00D7: the thin small multiplication sign;
- U+2715 or U+2716: the thin or thick big multiplication crosses;
- U+2717 or U+2717: the thin or thick vote checking crosses.
And of course the dotted circle as seen in Unicode charts and the
non-breaking space currently recommended as the invisible placeholder.
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