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   Re: XML and special Characters : unicode v3.0 ?

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  • From: John Cowan <cowan@locke.ccil.org>
  • To: XML Dev <xml-dev@ic.ac.uk>
  • Date: Wed, 03 Mar 1999 10:16:11 -0500

Baden Hughes wrote:

> Uh, that's gonna be a problem. How would you put in a PUA character in an
> XML doc ?  Still by the U+... ? (we have around 800 of them for the languages
> we work with !!)

Well, first of all there are 6400 private-use characters on the BMP,
so that gives you plenty of room to play with.  You cannot use
any kind of private-use character in element or attribute names,
which is good for interoperability; to incorporate them in
character data or attribute values, use a character reference
like &#xE000;.

What will be more serious is that *normative* characters from the
Astral Planes aren't usable in XML names either.  Presumably,
when they actually show up, XML will be modified, so that we can
have element names in Egyptian hieroglyphics with attributes in

John Cowan	http://www.ccil.org/~cowan		cowan@ccil.org
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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