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Information technology - ASN.1 encoding rules - Part 4: XML Encoding Rules (XER)
This document specifies a set of basic XML Encoding Rules (BASIC-XER) that may be used to derive a transfer syntax for values of types defined in Rec. ITU-T X.680 | ISO/IEC 8824-1 and Rec. ITU-T X.681 | ISO/IEC 8824-2.
This document 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.
This document further specifies a set of extended XML Encoding Rules (EXTENDED-XER) which adds further encoders 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 this document:
This document 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.
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