[Unicode Announcement] Character Encoding Stability Update

From: announcements@unicode.org
Date: Thu Feb 26 2009 - 19:32:54 CST

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    The Unicode Character Encoding Stability Policies have been updated
    with several new policies clarifying stability guarantees for Unicode
    character properties and their formal identifiers (called 'aliases').

    The new policies include:

    Alias Stability, guaranteeing no removals of defined aliases for
    Unicode properties or their values. This guarantee is aimed at ensuring
    that Unicode-based regular expressions will always retain syntactic validity.

    Property Stability, guaranteeing no removals of normative or informative
    character properties.

    Alias Uniqueness, laying out the rules for non-overlap of identifiers used
    for Unicode property and property value aliases.

    The Unicode Consortium would also like to announce the availability of a
    new Unicode Technical Report: UTR #45, U-source Ideographs. This UTR
    describes the U-source ideographs submitted by the Unicode Consortium
    as part of the input for use by the Ideographic Rapporteur Group in its
    ongoing CJK ideograph unification work.

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