From: Kenneth Whistler (kenw@sybase.com)
Date: Tue Feb 11 2003 - 18:57:38 EST
> Marco Cimarosti wrote:
> > It has been repeated a lot of times that no more precomposed character
> will
> > never ever ever ever be added. ...
I trust the clarification from John Cowan helped on this -- there
is no prohibition against adding characters with *compatibility*
decomposition mappings, because compatibility decompositions do
not recompose under normalization.
Maurice Bauhahn responded:
>
> In Unicode 4.0 there is a whole block (in the base plane, no less) of
> precomposed characters representing Khmer lunar dates (similar to vulgar
> fractions though lacking agreement, perhaps, on what the 'middle' character
> might be): http://www.unicode.org/charts/PDF/U40-19E0.pdf
There are not technically "precomposed characters" by Unicode's
definition, since they have no decompositions. They are just
complex symbols which do not decompose into a sequence of
other characters -- although it is obvious that they are
made up of parts themselves.
This is in some respects similar to the fact that Unicode
also does not decompose any Han characters, although those
also are obviously constructed of subparts in the usual
case.
--Ken
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