RE: Case mapping of dotless lowercase letters

From: Philippe Verdy (verdy_p@wanadoo.fr)
Date: Wed Dec 17 2003 - 15:28:22 EST

  • Next message: Chris Jacobs: "Re: Case mapping of dotless lowercase letters"

    Kent Karlsson
    > Philippe Verdy wrote:
    > > I do hope that dotless-j and dotted-J ...
    >
    > Dotless j. That's in the works.
    >
    > A precomposed dotted uppercase J? No, I think I can predict
    > that there will be no such encoded character. If you want a
    > dotted uppercase J, use <J, combining-dot-above>.

    I admit that the precomposed dotted-I was not really needed as
    well, as it has a canonical equivalence with the decomposed
    letter.

    As both J and dot-above are already encoded, the stability
    policy would require a candidate dotted-J to have a canonical
    decomposition EXCLUDED from NFC/NFKC recomposition (as it
    would break the NF(K)C form of existing texts that are coded
    with <LATIN CAPITAL LETTER J, COMBINING DOT ABOVE>). So
    the only good justification of encoding dotted-J would be for
    compatibility with another legacy encoding for roundtrip
    conversion, if this charset made the distinction between the
    precomposed and the decomposed sequences.

    However, could there be an encoding for:
            <LATIN CAPITAL LETTER DOTLESS J>
    with a lowercase mapping to the new:
            <LATIN SMALL LETTER DOTLESS J>
    Of course the former would look exactly the same as the
    ASCII uppercase J, except that it would have a distinct
    case mapping. This would avoid, for j/J the nightmare
    of dotless-i/dotted-i/I...

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