From: Mark Davis (firstname.lastname@example.org)
Date: Mon Jan 22 2007 - 16:05:29 CST
One further correction. The number of noncharacter code points is limited
according to the Unicode stability policies (
http://www.unicode.org/standard/stability_policy.html), so #3 is also not
permitted. However, if people needed a larger range of process-internal
values, and didn't want to use private use codes, there is nothing to
prevent them from using sequences of non-character code points.
On 1/21/07, Mark Davis <email@example.com> wrote:
> As Eric said, this is already provided for.
> 1. There are already 66 code points available for process-internal
> use, called noncharacters (see below)
> 2. It would be backwards incompatible for the consortium to make ANY
> change in PUA characters. There is, IMO, essentially zero chance of this
> happening. So it is not worth discussing any further.
> 3. If someone really wanted to propose additional noncharacter code
> points, on the other hand, that is certainly possible. (And as a reminder,
> NO proposal that is circulated on this list is taken up by the UTC unless a
> written proposal is submitted to
> http://www.unicode.org/reporting.html (or by unicode members via
> internal mechanisms).) One would have to make a very good case for the need,
> FDD0..FDEF # Cn FFFE..FFFF #Cn  1FFFE..1FFFF #Cn  2FFFE..2FFFF #
> Cn  3FFFE..3FFFF #Cn  4FFFE..4FFFF #Cn  5FFFE..5FFFF #Cn 
> 6FFFE..6FFFF #Cn  7FFFE..7FFFF #Cn  8FFFE..8FFFF #Cn 
> 9FFFE..9FFFF #Cn  AFFFE..AFFFF #Cn  BFFFE..BFFFF #Cn 
> CFFFE..CFFFF #Cn  DFFFE..DFFFF #Cn  EFFFE..EFFFF #Cn 
> FFFFE..FFFFF #Cn  10FFFE..10FFFF #Cn 
> On 1/21/07, Eric Muller < firstname.lastname@example.org> wrote:
> > Ruszlan Gaszanov wrote:
> > > So, why don't we split the PUA into character-PUA (reserved for
> > representing non-standard characters) and non-character-PUA (reserved for
> > process-internal uses)?
> > This problem is already solved, using noncharacters: the last two
> > characters of each plane and U+FDD0..U+FDEF. See TUS 5, section 16.7,
> > page 549, or TUS 4, section 15.7, page 398.
> > Eric.
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