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From: "James Clark" <firstname.lastname@example.org>
> 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.