RE: Slots for Cyrillic Accented Vowels

From: Roozbeh Pournader (
Date: Tue May 24 2011 - 18:28:24 CDT

  • Next message: Peter Constable: "RE: Slots for Cyrillic Accented Vowels"

    On Mon, 2011-05-23 at 08:17 -0700, Phillips, Addison wrote:
    > [...] you generally should not emit NFD "into the wild"

    In the real world, of course, you should actually not emit NFC either.
    A famous case that comes to bite me again and again, is that some
    XP-era Microsoft applications don't render canonically equivalent
    strings the same way, so if you normalize something, you lose its
    preferred display and semantics. For example, the sequence <ARABIC
    LETTER SEEN, ARABIC SHADDA, ARABIC FATHA>, which is a kind of very
    normal and rather common sequence in Arabic, will be displayed wrongly
    in Windows XP's Uniscribe if one actually normalizes it (to either NFC
    or NFD), becoming <SEEN, FATHA, SHADDA>, which is displayed wrongly in
    both Notepad and Word 2003 under Windows XP.


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