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   Re: [xml-dev] A heavier-weight proposal for character entity definition

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From: "James Clark" <jjc@jclark.com>
> Interesting.  Those are compelling use cases but this significantly 
> complicates things.  

Having an element or entity that just contains a combining character
looks dangerous.  This was discussed at the i18n SIG at W3C Boston 
last year. The behaviour of a combining character at the begining
of a file when displayed or edited is not defined AFAIK: so you are
at the whims of the system. Some systems, on seeing
 <!ENTITY tilde '~' > 
where ~ is the non-spacing (combining) form will just strip it out. 

So a combining character without a base is not "text", and therefore
not expressable with XML, at least as best practice.



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