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).
At the time of publication, ISO/IEC 8825-5:2004 is available from ISO and IEC in English only. CSA will publish the French version when it becomes available from ISO and IEC.
International Standard specifies a mapping from any XSD Schema into an ASN.1 schema. The ASN.1 schema supports the same semantics and validates the same set of XML documents.
International Standard specifies the final XER encoding instructions that are to be applied as part of the defined mapping to ASN.1 types, but does not specify which syntactic form is to be used for the specification of those final XER encoding instructions, or the order or manner of their assignment.
NOTE - Implementers of tools generating these mappings may choose any syntactic form or order of assignment that results in the specified final XER encoding instructions being applied.
Examples in this Recommendation
International Standard generally use the type prefix form, but use of an XER Encoding Control Section may be preferred for the mapping of a complete XSD Schema, as a matter of style. There are different ways (syntactically) of assigning XER encoding instructions for use in EXTENDED-XER encodings (for example, use of ASN.1 type prefix encoding instructions or use of an XER encoding control section).
The choice of these syntactic forms is a matter of style and is outside the scope of this Recommendation
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CAN/CSA-ISO/IEC 8825-5A-05 - Amendment 1:2009 to CAN/CSA-ISO/IEC 8825-5-05, Information Technology - ASN.1 Encoding Rules: Mapping W3C XML Schema Definitions into ASN.1 - Amendment 1: Efficiency Enhancements (Adopted Amendment 1:2008 to ISO/IEC 8825-5:2004)