ISO 15924 codes reserved for private use

From: Philippe Verdy (
Date: Sat May 22 2004 - 18:38:18 CDT

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    Someone said here that there are today lots of more scripts studied than have
    for now no interchangeability, but that may be still needed for bibliographic
    references, so that there was already a private registry of private use script
    codes (PUSC) nearly filling all the PUSC space allocated in ISO 15924 (50 rows,
    with Code in Qaaa to Qabx).

    I understand that this space is limited to 50 numeric codes, but why isn't there
    space for 10 times more with 4-letter codes? Is it required that all 4-letter
    PUSC codes have a corresponding numeric code?

    Could there not exist another separate range of PUSC codes without any
    associated 3-digits numeric code (the application will choose itself and
    privately the numeric index to associate for them if it is needed, for example
    by mapping them starting at 1000, or using negative values) ?

    If so, why not reserving all codes starting by "Qa" for private use? This would
    give 676 rows, whose only 50 first ones have a standard 3-digits numeric code,
    and could allow librarians to create their own private references by giving them
    full freedom on the last 2 letters of alphabetic codes, so that they could use
    them mnemonically (for now all they have is "aa" to "az" and ba" to "bx").

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