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BS ISO/IEC 8825-4:2021

BS ISO/IEC 8825-4:2021

$215.11

Information technology. ASN.1 encoding rules – XML Encoding Rules (XER)

Published By Publication Date Number of Pages
BSI 2021 86
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This Recommendation | International Standard 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 Recommendation | International Standard 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 Recommendation | International Standard 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 Recommendation | International Standard:

  • 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 Rec. ITU-T X.680 | ISO/IEC 8824-1.

This Recommendation | International Standard 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.

PDF Catalog

PDF Pages PDF Title
2 undefined
6 Blank Page
7 CONTENTS
11 Introduction
12 Blank Page
13 1 Scope
2 Normative references
2.1 Identical Recommendations | International Standards
14 2.2 Additional references
3 Definitions
3.1 ASN.1 Basic Encoding Rules (BER)
3.2 Additional definitions
16 4 Abbreviations
5 Encodings specified by this Recommendation | International Standard
17 6 Encoding instructions specified by this Recommendation | International Standard
7 Conformance
8 Basic XML encoding rules
8.1 Production of a complete BASIC-XER encoding
18 8.2 The XML prolog
8.3 The XML document element
19 8.4 Encoding of the EXTERNAL type
8.5 Encoding of the open type
8.6 Decoding of types with extension markers
9 Canonical XML encoding rules
9.1 General rules for canonical XER
20 9.2 Real values
9.3 Bitstring value
9.4 Octetstring value
9.5 Sequence value
9.6 Set value
9.7 Set-of value
21 9.8 Object identifier value
9.9 Relative object identifier value
9.10 GeneralizedTime
9.11 UTCTime
22 9.12 Open type value
9.13 The TIME type and the useful time types
10 Extended XML encoding rules
10.1 General
23 10.2 EXTENDED-XER conformance
25 10.3 Structure of an EXTENDED-XER encoding
11 Notation, character set and lexical items used in XER encoding instructions
26 12 Keywords
27 13 Assigning an XER encoding instruction to an ASN.1 type using a type prefix
29 14 Assigning an XER encoding instruction using an XER encoding control section
14.1 The encoding instruction assignment list
30 14.2 Identification of the targets for an XER encoding instruction using a target list
14.2.1 General rules
32 14.2.2 Target identification using an ASN.1 type reference and identifiers
33 14.2.3 Target identification using a built-in type name
34 14.2.4 Use of identifiers in context
35 14.2.5 Use of imported types identification
15 Multiple assignment of XER encoding instructions
15.1 Order in which multiple assignments are considered
36 15.2 Effect of assigning a negating encoding instruction
15.3 Multiple assignment of encoding instructions with multiple categories
15.4 Multiple assignment of XER encoding instructions of the same category
37 15.5 Permitted combinations of final encoding instructions
38 16 XER encoding instruction support for XML namespaces and qualified names
39 17 Specification of EXTENDED-XER encodings
40 17.1 The XML document element
17.2 The “TypeNameOrModifiedTypeName” production
17.3 The “AttributeList” production
17.4 The “ExtendedXMLValue” production
42 17.5 The “ExtendedXMLChoiceValue” production
17.6 The “ExtendedXMLSequenceValue” and “ExtendedXMLSetValue” productions
43 17.7 The “ExtendedXMLSequenceOfValue” and “ExtendedXMLSetOfValue” productions
44 17.8 The “ModifiedXMLIntegerValue” production
17.9 The “ModifiedXMLRealValue” production
45 18 The ANY-ATTRIBUTES encoding instruction
18.1 General
46 18.2 Restrictions
18.3 Effect on encodings
47 19 The ANY-ELEMENT encoding instruction
19.1 General
19.2 Restrictions
48 19.3 Effect on encodings
49 20 The ATTRIBUTE encoding instruction
20.1 General
20.2 Restrictions
20.3 Effect on encodings
51 21 The BASE64 encoding instruction
21.1 General
21.2 Restrictions
21.3 Effect on encodings
52 22 The DECIMAL encoding instruction
22.1 General
22.2 Restrictions
22.3 Effect on encodings
53 23 The DEFAULT-FOR-EMPTY encoding instruction
23.1 General
23.2 Restrictions
54 23.3 Effect on encodings
55 24 The ELEMENT encoding instruction
24.1 General
24.2 Restrictions
24.3 Effect on encodings
25 The EMBED-VALUES encoding instruction
25.1 General
25.2 Restrictions
56 25.3 Effect on encodings
26 The GLOBAL-DEFAULTS encoding instruction
26.1 General
57 26.2 Restrictions
26.3 Effect on encodings
27 The LIST encoding instruction
27.1 General
27.2 Restrictions
58 27.3 Effect on encodings
28 The NAME encoding instruction
28.1 General
59 28.2 Restrictions
60 28.3 Effect on encodings
29 The NAMESPACE encoding instruction
29.1 General
61 29.2 Restrictions
29.3 Effect on encodings
62 30 The PI-OR-COMMENT encoding instruction
30.1 General
30.2 Restrictions
30.3 Effect on the encodings
63 31 The TEXT encoding instruction
31.1 General
31.2 Restrictions
64 31.3 Effect on encodings
32 The UNTAGGED encoding instruction
32.1 General
65 32.2 Restrictions
32.3 Effect on encodings
66 33 The USE-NIL encoding instruction
33.1 General
33.2 Restrictions
67 33.3 Effect on encodings
34 The USE-NUMBER encoding instruction
34.1 General
34.2 Restrictions
34.3 Effect on encodings
68 35 The USE-ORDER encoding instruction
35.1 General
35.2 Restrictions
69 35.3 Effect on encodings
36 The USE-QNAME encoding instruction
36.1 General
70 36.2 Restrictions
36.3 Effect on encodings
37 The USE-TYPE encoding instruction
37.1 General
37.2 Restrictions
71 37.3 Effect on encodings
38 The USE-UNION encoding instruction
38.1 General
38.2 Restrictions
72 38.3 Effect on encodings
73 39 The WHITESPACE encoding instruction
39.1 General
39.2 Restrictions
39.3 Effect on encodings
74 40 Identification of the encoding rules
75 Annex A Examples of BASIC-XER and CXER encodings
A.1 ASN.1 description of the record structure
A.2 ASN.1 description of a record value
A.3 Basic XML representation of this record value
76 A.4 Canonical XML representation of this record value
77 Annex B Partial XML content and deterministic encodings
B.1 Partial XML content
B.2 Recommended restrictions on encodings producing partial XML element content
80 Annex C Examples of EXTENDED-XER encodings using XER encoding instructions
C.1 Introduction
C.2 Simple examples
C.2.1 A base-ball card
81 C.2.2 An employee
C.3 More complex examples
C.3.1 Using a union of two simple types
C.3.2 Using a type identification attribute
82 C.3.3 Using enumeration values
C.3.4 Using an empty encoding for a default value
C.3.5 Using embedded-values for notification of a payment due

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BS ISO/IEC 8825-4:2021
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