From: Phillips, Addison (email@example.com)
Date: Fri Jul 04 2008 - 10:31:43 CDT
See Section 3.8 in the standard:
In my experience, it is a lot clearer to folks if you do not refer to surrogate code points as anything other than reserved. UTF-16 uses code units to encode Unicode code points.
Formally, the code points in Unicode run from 0 through 0x10FFFF, so the surrogate code points are code points. However the code points between D800 and DFFF are reserved and do not encode characters. Section 3.9 says:
"Each encoding form maps the Unicode code points U+0000..U+D7FF and
U+E000..U+10FFFF to unique code unit sequences."
So, the surrogate pair (of code units) encodes a code point (U+20045 in your example).
Globalization Architect -- Lab126
Internationalization is not a feature.
It is an architecture.
> -----Original Message-----
> From: firstname.lastname@example.org [mailto:email@example.com]
> On Behalf Of Jeroen Ruigrok van der Werven
> Sent: Friday, July 04, 2008 12:09 AM
> To: Doug Ewell
> Cc: Unicode Mailing List
> Subject: Re: UTF-16 clarification needed
> -On [20080704 08:47], Doug Ewell (firstname.lastname@example.org) wrote:
> >They are both UTF-16 code units and code points. They are not
> >scalar values.
> OK, and when you have them together in a surrogate pair, do you
> call it a
> pair of code units or can you also call them a pair of code points?
> Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> /
> イェルーン ラウフロック ヴァン デル ウェルヴェン
> http://www.in-nomine.org/ | http://www.rangaku.org/ | GPG: 2EAC625B
> A wise man that walks in the dark with a blindfold on, is not much
> of a
> wise man...
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