FW: Normative Changes in Unicode 3.1

The appended message from the Chair of the Unicode Technical Committee
provides a summary of normative changes in the Unicode Standard 3.1,
published on March 30, 2001.

Misha Wolf
W3C I18N WG Chair


On 21/04/2001 00:00:49 Lisa Moore wrote:
> To: Unicode Liaison Organizations
>
>
> The Unicode Standard 3.1 was published on March 30, 2001, and can be found
> on the Unicode web site at: http://www.unicode.org/unicode/reports/tr27 .
> Listed here for your convenience is a summary of the normative changes in
> this revision of the Standard. However, we would still urge you to review
> the entire document for any changes relevant to your organization.
>
> Normative changes in Unicode 3.1:
>
> - New character allocations: Unicode 3.1 adds 44,946 encoded characters:
> 42,711 new ideographs, many additional symbols, historical scripts, and tag
> characters.
>
> - Supplementary characters: Characters are now encoded beyond the original
> 16-bit codespace (BMP).
>
> - Amended data files: Data files have been updated to account for
> the new repertoire of characters.
>
> - UTF-32: Unicode now has three sanctioned encoding forms: UTF-8, UTF-16,
> and UTF-32.
>
> - Noncharacters: Thirty-two more noncharacters have been added and the
> status of all sixty-six noncharacters has been clarified.
>
> - UTF-8 corrigendum: The definition of UTF-8 has been corrected for a
> security issue: conformant implementations now cannot interpret
> non-shortest forms for BMP characters.
>
> - Special character properties: Music format control characters were added
> to the list of special character properties.
>
> - UAX#15 Unicode Normalization Forms:  U+FB1D YOD WITH HIRIQ has been added
> to the Composition Exclusion List.
>
> - New normative properties: All of the General Category values plus the
> case mappings in UnicodeData.txt and SpecialCasing.txt are now normative;
> Cn is the default value for the general category for all unassigned code
> points and noncharacters.
>
> - Normative references: The use of normative references to Unicode
> properties by other specifications was clarified.
>
>
> Lisa Moore
> UTC Chair



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Received on Sunday, 22 April 2001 10:45:28 UTC