From: Pravin S (firstname.lastname@example.org)
Date: Mon Jul 07 2008 - 00:14:09 CDT
Philippe has already explained all the points present in proposal
(thanks for that)
see my comments below
2008/7/7 Christopher Fynn <email@example.com>:
> Philippe Verdy wrote:
> I suspect that most of the pre-composd isolate vowels were included for
> backwards compatibility with a pre-existing standard(s) like ISCII - IMO
> there is no good reason to add additional pre-composed characters when a
> base character + combining mark will work fine particularly when these
> characters are for a what seems to be pretty well a brand-new orthography.
As per Devanagari syllable rule Matra's can,t combine with vowel's,
that's why Devanagari code chart consist of U+0904 to U+0914 vowels
and corresponding Matras at U+093E to U+094C
In fact recent character added in Unicode 5.1 U+0972 'à¥²' was also came
due to this reason only
since à¤… + à¥…  combining was not possible due to script grammar.
The same is not allowed in all Rendering Engine(ICU, PANGO and Uniscribe too).
> Generally I think it is a good idea try to conserve as much space as
> possible in the Devanagari block on the BMP as, given the number of
> languages written in Devanagari, it seems likely that there will eventually
> be more characters that it would be best to have there. IMHO adding
> unnecessary pre-composed characters when a combination (base char +
> combining mark) will do is not the best use of valuable space.
I agree we need reserved space, but IMO we should not violate script
grammar for preserving space.
>> That's the way I understand it. The proposal is preserving the
> Preserving consistency could be used the next time someone wants to add more
> pre-composed Latin chars. Actually I don't see that encoding only the
> combining chars breaks the encoding model used for Devanangari which
> already has many combining chars.
Nope, presently no such instance available in Devanagari, i.e (Vowel)
+ (Matras) Combination
and not allowed.
*Vowel's can combined only with Vowel Modifiers(U+0901 to U+0903) as
per syllable rule
> I thought there was a policy not to add more pre-composed characters. Is
> this not the case?
It will add exception's in script grammar.
Thanks & Regards,
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