Re: Regulating PUA.

From: Mark Davis (mark.davis@icu-project.org)
Date: Mon Jan 22 2007 - 16:05:29 CST

  • Next message: Peter Constable: "RE: Regulating PUA."

    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.

    Mark

    On 1/21/07, Mark Davis <mark.davis@icu-project.org> 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,
    > however.
    >
    > FDD0..FDEF # Cn[32] FFFE..FFFF #Cn [2] 1FFFE..1FFFF #Cn [2] 2FFFE..2FFFF #
    > Cn [2] 3FFFE..3FFFF #Cn [2] 4FFFE..4FFFF #Cn [2] 5FFFE..5FFFF #Cn [2]
    > 6FFFE..6FFFF #Cn [2] 7FFFE..7FFFF #Cn [2] 8FFFE..8FFFF #Cn [2]
    > 9FFFE..9FFFF #Cn [2] AFFFE..AFFFF #Cn [2] BFFFE..BFFFF #Cn [2]
    > CFFFE..CFFFF #Cn [2] DFFFE..DFFFF #Cn [2] EFFFE..EFFFF #Cn [2]
    > FFFFE..FFFFF #Cn [2] 10FFFE..10FFFF #Cn [2]
    > Mark
    >
    > On 1/21/07, Eric Muller < emuller@adobe.com> 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.
    > >
    > >
    > >
    >
    >
    > --
    > Mark 

    -- 
Mark

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