ISO/IEC 8825-4:2008

Information technology — ASN.1 encoding rules: XML Encoding Rules (XER) — Part 4: ISO/IEC 8825-4:2008

Publication date:   Dec 15, 2008

95.99 Withdrawal of Standard   Nov 12, 2015

General information

95.99 Withdrawal of Standard   Nov 12, 2015

ISO/IEC

ISO/IEC JTC 1/SC 6 Telecommunications and information exchange between systems

International Standard

35.100.60   Presentation layer

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Scope

ISO/IEC 8825-4:2008 specifies a set of basic XML Encoding Rules (BASIC-XER) that can be used to derive a transfer syntax for values of types defined in ISO/IEC 8824-1 and ISO/IEC 8824-2. It also specifies a set of Canonical XML Encoding Rules (CXER) which provide constraints on the basic XML Encoding Rules and produce a unique encoding for any given ASN.1 value. ISO/IEC 8825-4:2008 further specifies a set of extended XML Encoding Rules (EXTENDED-XER) which adds further encoder options, and also allows the ASN.1 specifier to vary the encoding that would be produced by BASIC-XER. It is implicit in the specification of these encoding rules that they are also used for decoding.
The encoding rules specified in ISO/IEC 8825-4:2008:

are used at the time of communication;
are intended for use in circumstances where displaying of values and/or processing them using commonly available XML tools (such as browsers) is the major concern in the choice of encoding rules;
allow the extension of an abstract syntax by addition of extra values for all forms of extensibility described in ISO/IEC 8824-1.

ISO/IEC 8825-4:2008 also specifies the syntax and semantics of XER encoding instructions, and the rules for their assignment and combination. XER encoding instructions can be used to control the EXTENDED-XER encoding for specific ASN.1 types.

Life cycle

NOW

WITHDRAWN
ISO/IEC 8825-4:2008
95.99 Withdrawal of Standard
Nov 12, 2015

CORRIGENDA / AMENDMENTS

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ISO/IEC 8825-4:2008/Cor 1:2012

WITHDRAWN
ISO/IEC 8825-4:2008/Cor 2:2014

REVISED BY

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ISO/IEC 8825-4:2015

Relations

Adopted from ITU-T Rec X.693 (2008)