RE: Display of Isolated Nonspacing Marks (was Re: Questions on ZWNBS...)

From: Kent Karlsson (
Date: Thu Aug 07 2003 - 16:53:49 EDT

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    > > there is no such thing as "NFD decompositions".
    > Sorry for the confusion. Still even with a NFKD decomposition,

    And there is no such thing as NFKD decomposition either.
    It goes as follows, in steps:

    1. Canonical and compatibility decomposition mappings (one-step),
       and canonical classes.

    2. Canonical and compatibility full/recursive decompositions
        and canonical reordering. The compatibility (full) decompositions
        make use of both the canonical and compatibility
        decomposition mappings.

    3. Canonical and compatibility equivalences.

    4. The four Unicode normal forms (NFD, NFC, NFKD, and NFKC).

    Please don't turn it upside down, that's only confusing!

    Ok, the formal definition of equivalences and normal forms
    are a bit backwards in The Unicode standard, defining NFD
    (in practice, though not the name) before the equivalences.
    Normally, a normal form is defined as a particular representative
    element in an equivalence class...

    But there is no need to aggravate the backwardsness into

    > It's true that not all (only most) combining non-spacing
    > characters have a non-combining spacing counterpart.

    Only a *few* g.c. Mn characters have spacing counterparts!

                    /kent k

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