ISO/IEC 8824-1:2021(EN) Information technology — Abstract Syntax Notation One (ASN.1) — Part 1: Specification of basic notation

ISO/IEC 8824-1:2021 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.
ISO/IEC 8824-1:2021 defines a number of simple types, with their tags, and specifies a notation for referencing these types and for specifying values of these types and mechanisms for constructing new types from more basic types, and specifies a notation for defining such types and assigning them tags, and for specifying values of these types;

ISO/IEC 8824-1:2021 also defines character sets (by reference to other Recommendations and/or International Standards) for use within ASN.1. The ASN.1 notation can be applied whenever it is required to define the abstract syntax of information. The ASN.1 notation is referenced by other standards which define encoding regulations set for the ASN.1 types.
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