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Abstract Syntax Notation 1 (ASN.1)


  an abstract notation for structuring complex data objects.
NIST SP 800-15

  A standard, flexible method that (a) describes data structures for representing, encoding, transmitting, and decoding data, (b) provides a set of formal rules for describing the structure of objects independent of machine-specific encoding techniques, (c) is a formal network-management Transmission Control Protocol/Internet Protocol (TCP/IP) language that uses human-readable notation and a compact, encoded representation of the same information used in communications protocols, and (d) is a precise, formal notation that removes ambiguities.
NIST SP 800-58 under Abstract syntax notation one (ASN.1)