Re: ISO-15924 script nodes and UAX#24 script IDs

From: Doug Ewell (
Date: Mon May 17 2004 - 21:42:34 CDT

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    Philippe Verdy <verdy underscore p at wanadoo dot fr> wrote:

    > I know that now ISO15924 publishes 4-letter codes for scripts used in
    > Bibliographic references and that it contains more scritps than in
    > Unicode as ISO-15924 needs separate codes for variants that are
    > unified for Unicode encoding.

    That's one of the reasons. The other, as you mention later, is that
    some scripts that have ISO 15924 codes aren't in Unicode yet.

    > I also understand that Unicode defines its own "Hiragana_or_Katakana"
    > code that is needed for character classification of a few characters
    > (this specific code is not used as script codes for bibliographic
    > reference, and that's a good justification for listing the "script"
    > name in ISO-15924 between parentheses as this is a technical
    > requirement, however ISO-15924 still accepted to encode it under
    > N°=412, Code=Hrkt.)

    Michael says Hrkt was part of the draft standard before the Unicode
    character-classification need became known.

    > I also understand that Unicode also needs script IDs for "Common" and
    > "Inherit".
    > ...
    > - Should there exist a "Zwww" code in ISO 15924 for the Unicode
    > "Inherited" script ID?

    "Inherited" is a concept unique to UAX #24. There is no real need for
    such a code in ISO 15924. The private-use code Qaai works fine for

    -Doug Ewell
     Fullerton, California

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