Differences between Unicode and ISO 10646 regarding canonical equivalence and deprecation

From: Karl Pentzlin (karl-pentzlin@acssoft.de)
Date: Tue Sep 16 2008 - 03:35:33 CDT

  • Next message: Karl Pentzlin: "[OT] Which international keyboard standards refer to ISO/IEC 9995-3 ?"

    Searching the ISO/IEC 10646:2003 documents (as found on
    http://standards.iso.org/ittf/PubliclyAvailableStandards/index.html )
    for "canonical", "equivalence", "deprecat" does not yield anything
    regarded to the Unicode concepts of "canonical equivalence" and
    "deprecation".
    Thus, any standard which refers to ISO/IEC 10646 neither can nor needs
    to reference to these Unicode character properties, as long as it does
    not formally reference explicitly to Unicode also.

    Is this conclusion correct?

    Especially, I am involved in the preparing of a Committee Draft of
    the next version of the keyboard related standard ISO/IEC 9995-3
    "Complementary layouts of the alphanumeric zone of the alphanumeric
    section".
    This standard refers to the following ISO 10646 characters:

    U+0149 LATIN SMALL LETTER N PRECEDED BY APOSTROPHE
     (which is deprecated now in Unicode)
    U+2126 OHM SIGN
     (which in Unicode has a canonical equivalence to:
      U+03A9 GREEK CAPITAL LETTER OMEGA)

    Thus, as in ISO 10646 these characters are ordinary characters
    without any special properties, they do not need any special treatment
    except an informative note that these characters may need some
    attention in environments using Unicode.

    Is this the correct way?

    - Karl Pentzlin



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