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    • CAN/CSA-ISO/IEC 14651-08

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    CAN/CSA-ISO/IEC 14651-08

    Information technology - International string ordering and comparison - Method for comparing character strings and description of the common template tailorable ordering (Adopted ISO/IEC 14651:2007, second edition, 2007-12-01)
    SKU: 2419395 Published by CSA Group Publication Year 2008 64 pages Withdrawn

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    Preface

    Standards development within the Information Technology sector is harmonized with international standards development. Through the CSA Technical Committee on Information Technology (TCIT), Canadians serve as the Canadian Advisory Committee (CAC) on ISO/IEC Joint Technical Committee 1 on Information Technology (ISO/IEC JTC1) for the Standards Council of Canada (SCC), the ISO member body for Canada and sponsor of the Canadian National Committee of the IEC. Also, as a member of the International Telecommunication Union (ITU), Canada participates in the International Telegraph and Telephone Consultative Committee (ITU-T).

    Scope

    This International Standard defines the followings.

    - A reference comparison method. This method is applicable to two character strings to determine theircollating order in a sorted list. The method can be applied to strings containing characters from the full repertoire of ISO/IEC 10646. This method is also applicable to subsets of that repertoire, such as those of the different ISO/IEC 8-bit standard character sets, or any other character set, standardised or not, to produce ordering results valid (after tailoring) for a given set of languages for each script. This method uses collation tables derived either from the Common Template Table defined in this International Standard or from one of its tailorings. This method provides a reference format. The format is described using the Backus-Naur Form (BNF). This format is used to describe the Common Template Table. The format is used normatively within this International Standard.

    - A Common Template Table. A given tailoring of the Common Template Table is used by the reference comparison method. The Common Template Table describes an order for all characters encoded in ISO/IEC 10646:2003 up to Amendment 2, plus characters DEVANAGARI LETTER GGA, DEVANAGARI LETTER JJA, DEVANAGARI LETTER DDDA and DEVANAGARI LETTER BBA (characters U097B, U097C, U097E and U097F, respectively). It allows for a specification of a fully deterministic ordering. This table enables the specification of a string ordering adapted to local ordering rules, without requiring an implementer to have knowledge of all the different scripts already encoded in the UCS.

    NOTE 1 This Common Template Table is to be modified to suit the needs of a local environment. The main worldwide benefit is that, for other scripts, often no modification is required and the order will remain as consistent as possible and predictable from an international point of view.

    NOTE 2 The character repertoire used in this International Standard is equivalent to that of the Unicode Standard version 5.0.

    - A reference name. The reference name refers to this particular version of the Common Template Table, for use as a reference when tailoring. In particular, this name implies that the table is linked to a particular stage of development of the ISO/IEC 10646 Universal multiple-octet coded character set.

    - Requirements for a declaration of the differences (delta) between the collation table and the Common Template Table.

    This International Standard does not mandate the following.

    - A specific comparison method; any equivalent method giving the same results is acceptable. - A specific format for describing or tailoring tables in a given implementation. - Specific symbols to be used by implementations, except for the name of the Common Template Table. - Any specific user interface for choosing options - Any specific internal format for intermediate keys used when comparing, nor for the table used. The use of numeric keys is not ma ndated either. - A context-dependent ordering. - Any particular preparation of character strings prior to comparison.

    NOTE 1 It is normally necessary to do preparation of character strings prior to comparison even if it is not prescribed by this International Standard (see Annex C).

    NOTE 2 Although no user interface is required to choose options or to specify tailoring of the Common Template Table, conformance requires always declaring the applicable delta, a declaration of differences with this table. It is recommended that processes present available tailoring options to users.
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    CAN/CSA-ISO/IEC 14651A-08

    CAN/CSA-ISO/IEC 14651A-08 - Amendment 1:2010 to CAN/CSA-ISO/IEC 14651-08, Information technology - International string ordering and comparison - Method for comparing character strings and description of the common template tailorable ordering - Amendment 1 (Adopted Amendment 1:2009 to ISO/IEC 14651:2007)

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