Han unification criteria - question about U+5C07

From: Julian Bradfield (jcb+unicode@inf.ed.ac.uk)
Date: Mon Aug 20 2007 - 09:08:30 CDT

  • Next message: Andrew West: "Re: Han unification criteria - question about U+5C07"

    I have a problem understanding a particular case of the application of
    the Han unification criteria, and should be grateful if somebody could
    explain what's going on.

    The criteria say that only characters with the same abstract shape can
    be unified, where abstract shape means roughly hierarchical structure
    down to the level of radicals. (It's not made precise, of course.)

    There is one specific example where two characters are unified,
    although they appear to me to be very clearly examples of different
    abstract shapes.

    The characters are the Chinese and Japanese versions of U+5C07
    (amongst other things, the jiang4 in Chinese ma2-jiang4).

    In Chinese fonts, this character is:
    left: radical 90 "half tree trunk"
      right: top: radical 36 "evening" plus extra dot (this dot being
                                       omitted in the simplified form)
             bottom: radical 41 "inch"

    In Japanese fonts, the top right component is instead the variant form
    of radical 87 "claw".

    The Unicode reference charts use the Chinese form, and the Japanese
    form is not included in Unicode. But since it seems clearly to differ in
    "abstract shape", why not?


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