Re: Canonical Combining Classes

From: Patrick Andries (patrick.andries@xcential.com)
Date: Wed Mar 16 2005 - 18:26:40 CST

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    Michel Bottin a écrit :
    As I was processing the UnicodeData.txt to convert it in XML, I found many values of Canonical Combining Classes not listed in http://www.unicode.org/Public/UNIDATA/UCD.html#Canonical_Combining_Class_Values.

    The collected is÷
    11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 84, 91, 103, 107, 118, 122, 129, 130, 132.
    These classes are listed :

    10: Start of fixed position classes
    199: End of fixed position classes


    Anybody knows the signification of these codes?
    As opposed to the other values ?

    In general, the Canonical Combining Classes represent the typographical interaction potential of the corresponding combining character, they are used in the canonical ordering algorithm (see D46, page 83 TUS 4.0). I'm not sure up to what point rendering engines use these classes to actually display the combining characters at a given position.


    P. A.
    - o - O - o -
    ISO 10646 en français
    http://hapax.qc.ca




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