ISO 8824 defines the Abstract Syntax Notation One (ASN.1) language as the standard mechanism for describing abstract data structures. The Mapping Services facility has adopted this language as the means to describe the logical (or abstract) data items within a data structure. The physical representation of the data can be defaulted from the ASN.1 definitions, or can be explicitly described by the inclusion of implementation specific definitions. This aspect is discussed in more detail later.
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