ITU-T X.680 (02/2021)

Introduction
1 Scope
2 Normative references
3 Definitions
4 Abbreviations
5 Notation
6 The ASN.1 model of type extension
7 Extensibility requirements on encoding rules
8 Tags
9 Encoding instructions
10 ITU-T X.680,X,680Use of the ASN.1 notation
11 ITU-T X.680,X,680The ASN.1 character set
12 ITU-T X.680,X,680ASN.1 lexical items
13 Module definition
14 Referencing type and value definitions
15 Notation to support references to ASN.1 components
16 Assigning types and values
17 Definition of types and values
18 Notation for the boolean type
19 Notation for the integer type
20 Notation for the enumerated type
21 Notation for the real type
22 Notation for the bitstring type
23 Notation for the octetstring type
24 Notation for the null type
25 Notation for sequence types
26 Notation for sequence-of types
27 Notation for set types
28 Notation for set-of types
29 Notation for choice types
30 Notation for selection types
31 Notation for prefixed types
32 Notation for the object identifier type
33 Notation for the relative object identifier type
34 Notation for the OID internationalized resource identifier type
35 Notation for the relative OID internationalized resource identifier type
36 Notation for the embedded-pdv type
37 Notation for the external type
38 The time type
39 The character string types
40 Notation for character string types
41 Definition of restricted character string types
42 Naming characters, collections and property category sets
43 Canonical order of characters
44 Definition of unrestricted character string types
45 Notation for types defined in clauses 46 to 48
46 Generalized time
47 Universal time
48 The object descriptor type
49 Constrained types
50 Element set specification
51 Subtype elements
52 The extension marker
53 The exception identifier
54 Encoding control sections

Recommendation ITU-T X.680 | ISO/IEC 8824-1 provides a notation called Abstract Syntax Notation One (ASN.1) for defining the syntax of information data.

This Recommendation | International Standard provides a standard notation called Abstract Syntax Notation One (ASN.1) that is used for the definition of data types, values, and constraints on data types.