1 Scope
This International Standard defines the followings.
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• A reference comparison method. This method is applicable to two character strings to determine their collating 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.
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• 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 4. 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 5.1.
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• 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.
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• 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.
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• A specific comparison method; any equivalent method giving the same results is acceptable.
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• A specific format for describing or tailoring tables in a given implementation.
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• Specific symbols to be used by implementations, except for the name of the Common Template Table.
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• Any specific user interface for choosing options.
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• Any specific internal format for intermediate keys used when comparing, nor for the
table used. The use of numeric keys is not mandated either.
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• A context-dependent ordering.
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• 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.