New Public Review Issue: UAX #9 Proposed Update

From: Rick McGowan (
Date: Fri Oct 14 2005 - 14:39:22 CST

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    The Unicode Technical Committee has posted a new issue for public review
    and comment. Details are on the following web page:


    Review periods for the new items close on October 28, 2005.

    Please see the page for links to discussion and relevant documents.
    Briefly, the new issue is:

    80 Proposed Update to UAX #9: The Bidirectional Algorithm

    The Unicode Bidi algorithm has allowed for a great deal of flexibility in
    determining which characters are to be mirrored (see HL6 Unfortunately, that
    means that text that originates with one person may show up with the wrong
    graphic to another, thus causing the text to be misinterpreted. The
    proposal is to tighten up conformance by limiting overriding to
    mathematical contexts, and at the same time adjusting the characters with
    the Bidi_Mirrored property.

    The UTC would like public feedback on whether to make this change, and
    which characters should have the Bidi_Mirrored property. The following is a
    possible change to the properties which bases the Bidi_Mirrored on the
    open/close punctuation in Unicode. It excludes the math characters
    (General_Category=Sm); implementations could tailor those characters to
    mirror in a mathematical context. For further information and character
    lists, see the background document for this issue.

    If you have comments for official UTC consideration, please post them by
    submitting your comments through our feedback & reporting page:

    If you wish to discuss issues on the Unicode mail list, then please
    use the following link to subscribe (if necessary). Please be aware
    that discussion comments on the Unicode mail list are not automatically
    recorded as input to the UTC. You must use the reporting link above
    to generate comments for UTC consideration.

            Rick McGowan
            Unicode, Inc.

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