Re: Is it roundtripping or transfer-encoding

From: Philippe Verdy (
Date: Wed Dec 22 2004 - 02:33:40 CST

  • Next message: Peter Kirk: "Re: Is it roundtripping or transfer-encoding"

    From: "Doug Ewell" <>
    > Philippe Verdy <verdy underscore p at wanadoo dot fr> wrote:
    >> Wrong. Non-standard normalization forms are useful too, and can even
    >> be safe if they preserve one of the two standard equivalences
    >> (canonical or compatibility).
    > I agree that non-standard normalization forms may have benefits, as in
    > your Korean example.
    > I respectfully disagree that they should be used. IMHO, the potential
    > for confusion and lack of interoperability is greater than the benefit.

    There's no interoperability problems with non-standard normalization forms
    (unless a process interface absolutely requires it, which would be wrong as
    it should be allowed to accept any canonically equivalent string, such as
    one of the 4 standard normalization forms)..

    But for internal processing, and even for process output, a non-standard
    normalization form is still a valid Unicode text, and thus should be
    interoperable (if it is not, blame the other "conforming" processes that
    reject these textsor process them incorrectly).

    Non standard normalization forms are used everyday, notably within
    renderers, because the NFD form is not the easiest ordering for converting
    text to glyph strings; same thing for collation, where an intermediate non
    standard normalization form greatly helps reducing the size of collation
    tables and the complexity of the algorithm...

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