From: Rick Cameron (Rick.Cameron@crystaldecisions.com)
Date: Wed May 14 2003 - 17:48:54 EDT
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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