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   Re: First draft of proposed XML TC for Unicode 3.0 (unofficial)

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  • From: John Cowan <cowan@locke.ccil.org>
  • To: xml-dev@ic.ac.uk
  • Date: Wed, 8 Sep 1999 11:57:18 -0400 (EDT)

James Clark scripsit:

> > 0E33;THAI CHARACTER SARA AM
> 
> That's very strange.  SARA AM certainly needs to be allowed in names.

It's a funny story.  In earlier versions of Unicode, SARA AM was treated
as canonically equivalent to NIKHAHIT followed by SARA AA; that is,
Unicode-conformant processes were not supposed to distinguish between
them.  In the latest version, this equivalence has been downgraded to
a mere compatibility equivalence.  As a result, SARA AM has become
a "compatibility character" and as such disallowed by the Appendix B rules.

> > 0EB3;LAO VOWEL SIGN AM

The same story applies here: the VOWEL SIGN AM is now a compatibility
equivalent of NIGGAHITA followed by VOWEL SIGN AA.

In any event, whatever XML worked before has to work now, so I am merely
proposing a statement that THAI CHARACTER SARA AM and LAO VOWEL SIGN
AM *are* legal in XML names, despite their status as Unicode compatibility
characters.  In any case their legality in XML *text* is of course not affected.

If anyone thinks something is desperately broken here, please contact
unicode@unicode.org right away.

-- 
John Cowan                                   cowan@ccil.org
       I am a member of a civilization. --David Brin

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