From: Mark Davis (mark.davis@jtcsv.com)
Date: Wed May 14 2003 - 18:24:13 EDT
> (I'm sure this is an FAQ - but why are the code points 0xd800-0xdfff
not
> considered noncharacters? Obviously no abstract character can be
associated
> with them! Is there a different term that describes code points like
this?)
They are called surrogate code points.
Märk Davis
________
mark.davis@jtcsv.com
IBM, MS 50-2/B11, 5600 Cottle Rd, SJ CA 95193
(408) 256-3148
fax: (408) 256-0799
----- Original Message -----
From: "Rick Cameron" <Rick.Cameron@crystaldecisions.com>
To: "Ben Dougall" <bend@freenet.co.uk>; <unicode@unicode.org>
Sent: Wednesday, May 14, 2003 14:48
Subject: RE: 'code unit' and 'code point' meaning check
> You can find the new, improved definitions of code point and code
unit in
> the online draft of Chapter 3 of TUS 4.0,
> http://www.unicode.org/book/preview/ch03.pdf
>
> A code point is a number between 0 and 0x10ffff. It is independent
of the
> encoding form.
>
> A code unit is the basic chunk of bits in one of the encoding forms
of
> Unicode - an 8-bit chunk in UTF-8, a 16-bit chunk in UTF-16 and a
32-bit
> chunk in UTF-32.
>
> (I'm sure this is an FAQ - but why are the code points 0xd800-0xdfff
not
> considered noncharacters? Obviously no abstract character can be
associated
> with them! Is there a different term that describes code points like
this?)
>
> - rick
>
> -----Original Message-----
> From: Ben Dougall [mailto:bend@freenet.co.uk]
> Sent: Wednesday, 14 May 2003 13:29
> To: unicode@unicode.org
> Subject: 'code unit' and 'code point' meaning check
>
>
> could someone confirm if i've got this correct, or not please?:
>
> a 'code unit' could be the same as a 'code point', but there again
it
> might not be. it's possible that several 'code units' are required
to
> make up a 'code point'? (so code units can be the same size or
smaller
> than a code point, but not the other way round)?
>
>
>
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