Re: Defined Private Use was: SSP default ignorable characters

From: Peter Kirk (
Date: Tue Apr 27 2004 - 19:06:36 EDT

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    On 27/04/2004 11:30, Asmus Freytag wrote:

    > At 07:27 AM 4/27/2004, Ernest Cline wrote:
    >> Others, such as Line Break, Bidi Class, and Casing are important,
    >> are used by existing software, and unlike Cursive Joining cannot
    >> simply be handled at present by putting out a Private Use font which
    >> is the current way that Private Use characters can be most easily
    >> and portably implemented.
    > For line break and bidi it is possible to use existing format controls
    > (and some of the properties in higher level protocols) to override the
    > default behavior - at the expense of additional codes or markup.
    > A./
    Would it perhaps be possible to define a set of additional format
    controls to override other character properties? This might be a more
    useful mechanism for defining PUA properties, and would be useful in
    other cases e.g. for characters which are used both as letters and
    digits, to indicate that they are being used as digits.

    I won't suggest a combining class override as I can see that this one
    would be a minefield! But CGJ can in principle be used to override
    normal canonical reordering behaviour.

    Peter Kirk (personal) (work)

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