Abstract Syntax Notation 1
<language, standard, protocol> (ASN.1, X.208, X.680) An ISO/ITU-T
standard for transmitting structured data on networks, originally defined in
1984 as part of CCITT X.409 '84. ASN.1 moved to its own standard, X.208, in 1988
due to wide applicability. The substantially revised 1995 version is covered by
the X.680 series.
ASN.1 defines the abstract syntax of information but does not restrict the way
the information is encoded. Various ASN.1 encoding rules provide the transfer
syntax (a concrete representation) of the data values whose abstract syntax is
described in ASN.1. The standard ASN.1 encoding rules include BER (Basic
Encoding Rules - X.209), CER (Canonical Encoding Rules), DER (Distinguished
Encoding Rules) and PER (Packed Encoding Rules).
ASN.1 together with specific ASN.1 encoding rules facilitates the exchange of
structured data especially between application programs over networks by
describing data structures in a way that is independent of machine architecture
and implementation language.
OSI Application layer protocols such as X.400 MHS electronic mail, X.500
directory services and SNMP use ASN.1 to describe the PDUs they exchange.
Documents describing the ASN.1 notations: ITU-T Rec. X.680, ISO 8824-1; ITU-T
Rec. X.681, ISO 8824-2; ITU-T Rec. X.682, ISO 8824-3; ITU-T Rec. X.683, ISO
Documents describing the ASN.1 encoding rules: ITU-T Rec. X.690, ISO 8825-1;
ITU-T Rec. X.691, ISO 8825-2.
[M. Sample et al, "Implementing Efficient Encoders and Decoders for Network Data
Representations", IEEE Infocom 93 Proc, v.3, pp. 1143-1153, Mar 1993. Available
from Logica, UK].
See also snacc.
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abstract syntax « Abstract Syntax Notation 1
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