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Publication details

Publication CODE Title
ISO/IEC 8825-4:2008 (2008-12) INFORMATION TECHNOLOGY -- ASN.1 ENCODING RULES: XML ENCODING RULES (XER)
 
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Description
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.
Class  C990  (IEC PUBLICATIONS IEC PUBLICATIONS)
Available files
EN version

Status
Status IEC PUBLICATION
Situation Withdrawn
Replaced by  ISO/IEC 8825-4:2015
Replaces  ISO/IEC 8825-4:2002
Replaces  ISO/IEC 8825-4:2002/AMD1:2004
Replaces  ISO/IEC 8825-4:2002/AMD2:2006
Replaces  ISO/IEC 8825-4:2002/AMD3:2008
Partly replaces  ISO/IEC 8825-4:2008/COR1:2012
Partly replaces  ISO/IEC 8825-4:2008/COR2:2014
Origin
Committee ISO/IEC JTC 1/SC 6
TELECOMMUNICATIONS AND INFORMATION EXCHANGE BETWEEN SYSTEMS
Approval
BEC Approval 2008-12-15
ICS-Code (International Standards Classification) 35.100.60
NBN Status New
IEC publication date 2008-12-15
IEC last modification date 2015-11-18