various ways of making a specific character

From: Agnieszka Kasprzyk (
Date: Thu May 24 2007 - 07:00:33 CDT

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    I work for the union catalog of Polish libraries. Our contributors use ISO
    transliteration standards.
    Could you explain me how to deal with those characters from transliteration
    standards that do not exist as precomposed characters in Unicode but they
    are combined of others BUT they may be combined in a number of different
    ways. Which is the correct way?

    ISO 259: 1984 Transliteration of Hebrew characters into Latin characters

    requires us to enter letter t with dot below and above and letter s with dot
    below and above.
    Now each of these characters may be built of:
    a) letter t/s (U+0073/U+0074) + combining dot below (U+0323) + combining dot
    above (U+0307)
    b) letter t/s with dot below (U+1E6D/U+1E63)+ combining dot above (U+0307)
    c) letter t/s with dot above (U+1E6B/U+1E61) + combining dot below (U+0323)

    Other cases are for instance letters with two diacritics one over the other.
    Should it be base letter + upper character + lower character, or base letter
    + character which is closer + character which is further from the base
    letter, or if it's possible, base letter with one diacritic as one character
    + the other diacritic as the combining character?

    What is the rule to follow in such cases? Is there any document specifying
    what to do?

    I would really appreciate your help with this,

    thank you,

    Agnieszka Kasprzyk

    NUKAT Center, Warsaw University Library, Poland

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