ISO/IEC 8825-3:2008
Information technology — ASN.1 encoding rules: Specification of Encoding Control Notation (ECN) — Part 3:
ISO/IEC 8825-3:2008 defines Encoding Control Notation (ECN): a notation for specifying encodings of ASN.1 types or of parts of types. It provides several mechanisms for such specification, including:
- direct specification of the encoding using standardized notation;
- specification of the encoding by reference to standardized encoding rules;
- specification of the encoding of an ASN.1 type by reference to an encoding structure;
- specification of the encoding using non-ECN notation.
It also provides the means to link the specification of encodings to the type definitions to which they are to be applied.
ECN does not currently provide any support for specifications using the object identifier (OID) internationalized resource identifier type or the relative OID internationalized resource identifier type (see ISO/IEC 8824-1).
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CONTENTS
FOREWORD
Introduction
1 Scope
2 Normative references
2.1 Identical Recommendations | International Standards
2.2 Additional references
3 Definitions
3.1 ASN.1 definitions
3.2 ECN-specific definitions
4 Abbreviations
5 Definition of ECN syntax
6 Encoding conventions and notation
7 The ECN character set
8 ECN lexical items
8.1 Encoding object references
8.2 Encoding object set references
8.3 Encoding class references
8.4 Reserved word items
8.5 Reserved encoding class name items
8.6 Non-ECN item
9 ECN Concepts
9.1 Encoding Control Notation (ECN) specifications
9.2 Encoding classes
9.3 Encoding structures
9.4 Encoding objects
9.5 Encoding object sets
9.6 Defining new encoding classes
9.7 Defining encoding objects
9.8 Differential encoding-decoding
9.9 Encoders options in encodings
9.10 Properties of encoding objects
9.11 Parameterization
9.12 Governors
9.13 General aspects of encodings
9.14 Identification of information elements
9.15 Reference fields and determinants
9.16 Replacement classes and structures
9.17 Mapping abstract values onto fields of encoding structures
9.18 Transforms and transform composites
9.19 Contents of Encoding Definition Modules
9.20 Contents of the Encoding Link Module
9.21 Defining encodings for primitive encoding classes
9.22 Application of encodings
9.23 Combined encoding object set
9.24 Application point
9.25 Conditional encodings
9.26 Other conditions for applying encodings
9.27 Encoding control for the open type
9.28 Changes to ASN.1 Recommendations | International Standards
10 Identifying encoding classes, encoding objects, and encoding object sets
11 Encoding ASN.1 types
11.1 General
11.2 Built-in encoding classes used for implicitly generated encoding structures
11.3 Simplification and expansion of ASN.1 notation for encoding purposes
11.4 The implicitly generated encoding structure
12 The Encoding Link Module (ELM)
12.1 Structure of the ELM
12.2 Encoding types
13 Application of encodings
13.1 General
13.2 The combined encoding object set and its application
14 The Encoding Definition Module (EDM)
15 The renames clause
15.1 Explicitly generated and exported structures
15.2 Name changes
15.3 Specifying the region for name changes
16 Encoding class assignments
16.1 General
16.2 Encoding structure definition
16.3 Alternative encoding structure
16.4 Repetition encoding structure
16.5 Concatenation encoding structure
17 Encoding object assignments
17.1 General
17.2 Encoding with a defined syntax
17.3 Encoding with encoding object sets
17.4 Encoding using value mappings
17.5 Encoding an encoding structure
17.6 Differential encoding-decoding
17.7 Encoding options
17.8 Non-ECN definition of encoding objects
18 Encoding object set assignments
18.1 General
18.2 Built-in encoding object sets
19 Mapping values
19.1 General
19.2 Mapping by explicit values
19.3 Mapping by matching fields
19.4 Mapping by
19.5 Mapping by abstract value ordering
19.6 Mapping by value distribution
19.7 Mapping integer values to bits
20 Defining encoding objects using defined syntax
21 Types used in defined syntax specification
22 Commonly used encoding property groups
22.1 Replacement specification
22.2 Pre-alignment and padding specification
22.3 Start pointer specification
22.4 Encoding space specification
22.5 Optionality determination
22.6 Alternative determination
22.7 Repetition space specification
22.8 Value padding and justification
22.9 Identification handle specification
22.10 Concatenation specification
22.11 Contained type encoding specification
22.12 Bit reversal specification
23 Defined syntax specification for bit-field and constructor classes
23.1 Defining encoding objects for classes in the alternatives category
23.2 Defining encoding objects for classes in the bitstring category
23.3 Defining encoding objects for classes in the boolean category
23.4 Defining encoding objects for classes in the characterstring category
23.5 Defining encoding objects for classes in the concatenation category
23.6 Defining encoding objects for classes in the integer category
23.7 Defining encoding objects for the
23.8 Defining encoding objects for classes in the null category
23.9 Defining encoding objects for classes in the octetstring category
23.10 Defining encoding objects for classes in the open type category
23.11 Defining encoding objects for classes in the optionality category
23.12 Defining encoding objects for classes in the pad category
23.13 Defining encoding objects for classes in the repetition category
23.14 Defining encoding objects for the
23.15 Defining encoding objects for classes in the tag category
23.16 Defining encoding objects for classes in the other categories
24 Defined syntax specification for the
25 Complete encodings and the
Annex A
Addendum to ITU-T Rec. X.680 | ISO/IEC 8824-1
A.1 Exports and imports clauses
A.2 Addition of
A.3 Notation for character string values
Annex B
Addendum to ITU-T Rec. X.681 | ISO/IEC 8824-2
B.1 Definitions
B.2 Additional lexical items
B.3 Addition of "ENCODING-CLASS"
B.4 FieldSpec additions
B.5 Fixed-type ordered value list field spec
B.6 Fixed-class encoding object field spec
B.7 Variable-class encoding object field spec
B.8 Fixed-class encoding object set field spec
B.9 Fixed-class ordered encoding object list field spec
B.10 Encoding class field spec
B.11 Ordered value list notation
B.12 Ordered encoding object list notation
B.13 Primitive field names
B.14 Additional reserved words
B.15 Definition of encoding objects
B.16 Additions to "Setting"
B.17 Encoding class field type
Annex C
Addendum to ITU-T Rec. X.683 | ISO/IEC 8824-4
C.1 Parameterized assignments
C.2 Parameterized encoding assignments
C.3 Referencing parameterized definitions
C.4 Actual parameter list
Annex D
Examples
D.1 General examples
D.2 Specialization examples
D.3 Explicitly generated structure examples
D.4 A more-bit encoding example
D.5 Legacy protocol specified with tabular notation
Annex E
Support for Huffman encodings
Annex F
Additional information on the Encoding Control Notation (ECN)
Annex G
Summary of the ECN notation
G.1 Terminal symbols
G.2 Productions
Amendments
Previous versions
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CONTENTS
FOREWORD
Introduction
1 Scope
2 Normative references
2.1 Identical Recommendations | International Standards
2.2 Additional references
3 Definitions
3.1 ASN.1 definitions
3.2 ECN-specific definitions
4 Abbreviations
5 Definition of ECN syntax
6 Encoding conventions and notation
7 The ECN character set
8 ECN lexical items
8.1 Encoding object references
8.2 Encoding object set references
8.3 Encoding class references
8.4 Reserved word items
8.5 Reserved encoding class name items
8.6 Non-ECN item
9 ECN Concepts
9.1 Encoding Control Notation (ECN) specifications
9.2 Encoding classes
9.3 Encoding structures
9.4 Encoding objects
9.5 Encoding object sets
9.6 Defining new encoding classes
9.7 Defining encoding objects
9.8 Differential encoding-decoding
9.9 Encoders options in encodings
9.10 Properties of encoding objects
9.11 Parameterization
9.12 Governors
9.13 General aspects of encodings
9.14 Identification of information elements
9.15 Reference fields and determinants
9.16 Replacement classes and structures
9.17 Mapping abstract values onto fields of encoding structures
9.18 Transforms and transform composites
9.19 Contents of Encoding Definition Modules
9.20 Contents of the Encoding Link Module
9.21 Defining encodings for primitive encoding classes
9.22 Application of encodings
9.23 Combined encoding object set
9.24 Application point
9.25 Conditional encodings
9.26 Other conditions for applying encodings
9.27 Encoding control for the open type
9.28 Changes to ASN.1 Recommendations | International Standards
10 Identifying encoding classes, encoding objects, and encoding object sets
11 Encoding ASN.1 types
11.1 General
11.2 Built-in encoding classes used for implicitly generated encoding structures
11.3 Simplification and expansion of ASN.1 notation for encoding purposes
11.4 The implicitly generated encoding structure
12 The Encoding Link Module (ELM)
12.1 Structure of the ELM
12.2 Encoding types
13 Application of encodings
13.1 General
13.2 The combined encoding object set and its application
14 The Encoding Definition Module (EDM)
15 The renames clause
15.1 Explicitly generated and exported structures
15.2 Name changes
15.3 Specifying the region for name changes
16 Encoding class assignments
16.1 General
16.2 Encoding structure definition
16.3 Alternative encoding structure
16.4 Repetition encoding structure
16.5 Concatenation encoding structure
17 Encoding object assignments
17.1 General
17.2 Encoding with a defined syntax
17.3 Encoding with encoding object sets
17.4 Encoding using value mappings
17.5 Encoding an encoding structure
17.6 Differential encoding-decoding
17.7 Encoding options
17.8 Non-ECN definition of encoding objects
18 Encoding object set assignments
18.1 General
18.2 Built-in encoding object sets
19 Mapping values
19.1 General
19.2 Mapping by explicit values
19.3 Mapping by matching fields
19.4 Mapping by
19.5 Mapping by abstract value ordering
19.6 Mapping by value distribution
19.7 Mapping integer values to bits
20 Defining encoding objects using defined syntax
21 Types used in defined syntax specification
22 Commonly used encoding property groups
22.1 Replacement specification
22.2 Pre-alignment and padding specification
22.3 Start pointer specification
22.4 Encoding space specification
22.5 Optionality determination
22.6 Alternative determination
22.7 Repetition space specification
22.8 Value padding and justification
22.9 Identification handle specification
22.10 Concatenation specification
22.11 Contained type encoding specification
22.12 Bit reversal specification
23 Defined syntax specification for bit-field and constructor classes
23.1 Defining encoding objects for classes in the alternatives category
23.2 Defining encoding objects for classes in the bitstring category
23.3 Defining encoding objects for classes in the boolean category
23.4 Defining encoding objects for classes in the characterstring category
23.5 Defining encoding objects for classes in the concatenation category
23.6 Defining encoding objects for classes in the integer category
23.7 Defining encoding objects for the
23.8 Defining encoding objects for classes in the null category
23.9 Defining encoding objects for classes in the octetstring category
23.10 Defining encoding objects for classes in the open type category
23.11 Defining encoding objects for classes in the optionality category
23.12 Defining encoding objects for classes in the pad category
23.13 Defining encoding objects for classes in the repetition category
23.14 Defining encoding objects for the
23.15 Defining encoding objects for classes in the tag category
23.16 Defining encoding objects for classes in the other categories
24 Defined syntax specification for the
25 Complete encodings and the
Annex A
Addendum to ITU-T Rec. X.680 | ISO/IEC 8824-1
A.1 Exports and imports clauses
A.2 Addition of
A.3 Notation for character string values
Annex B
Addendum to ITU-T Rec. X.681 | ISO/IEC 8824-2
B.1 Definitions
B.2 Additional lexical items
B.3 Addition of "ENCODING-CLASS"
B.4 FieldSpec additions
B.5 Fixed-type ordered value list field spec
B.6 Fixed-class encoding object field spec
B.7 Variable-class encoding object field spec
B.8 Fixed-class encoding object set field spec
B.9 Fixed-class ordered encoding object list field spec
B.10 Encoding class field spec
B.11 Ordered value list notation
B.12 Ordered encoding object list notation
B.13 Primitive field names
B.14 Additional reserved words
B.15 Definition of encoding objects
B.16 Additions to "Setting"
B.17 Encoding class field type
Annex C
Addendum to ITU-T Rec. X.683 | ISO/IEC 8824-4
C.1 Parameterized assignments
C.2 Parameterized encoding assignments
C.3 Referencing parameterized definitions
C.4 Actual parameter list
Annex D
Examples
D.1 General examples
D.2 Specialization examples
D.3 Explicitly generated structure examples
D.4 A more-bit encoding example
D.5 Legacy protocol specified with tabular notation
Annex E
Support for Huffman encodings
Annex F
Additional information on the Encoding Control Notation (ECN)
Annex G
Summary of the ECN notation
G.1 Terminal symbols
G.2 Productions