Mix encodings in a document?

John Cowan cowan at locke.ccil.org
Mon Sep 28 20:51:06 BST 1998

Tony Graham scripsit:

> Surrogate pairs are not allowed in parsed entities.  The production
> for Char excludes the surrogate blocks:
> [2] Char::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD]
>             | [#x10000-#x10FFFF]

On the contrary.  UTF-16 is a standard representation that XML
systems must accept (clause 4.3.3), and the representation of the
characters #x10000-#x10FFFF in UTF-16 (which is the same as
Unicode 2.x) is precisely a surrogate pair.

Individual surrogate characters are excluded, but they have no meaning
in UTF-16 anyway.

> You can include non-BMP/non-UCS-2 characters by making numeric
> references to their Unicode Scalar Value (or by using UCS-4).

That works too.

John Cowan	http://www.ccil.org/~cowan		cowan at 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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