Mix encodings in a document?

John Cowan cowan at locke.ccil.org
Wed Sep 23 17:01:46 BST 1998

Deke Smith asked about Gavin Thomas Nicol's remark:

> >Remember: byte != character code != character != glyph

A character code may be more than one byte long, but is always
an integer.  A character is an abstract object which can be
represented by different character codes in different coded
character sets (ASCII, EBCDIC/US, JIS X 0208, etc.)

Glyphs are abstractions of *appearance*, whereas characters are
abstractions of *function*.
> ISO-10646-UCS-2
> ISO-10646-UCS-4
> ISO-10646-UTF-1
> ISO-10646-Unicode-Latin1
> ISO-10646-J-1
> UTF-7
> UTF-8

ISO-10646-UCS-2 is near enough UTF-16; UTF-16 only implies that
surrogates are correctly processed, and decent UCS-2 implementations
will at worst leave surrogates alone.
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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