ITU-T X.209-1989 Specification of Basic Encoding Rules for Abstract Syntax Notation One (ASN.1) - Data Communication Networks - Open Systems Interconnection (OSI) Model and Notation, Service Definition (Study Group VII) 21 pp
the variety and complexity of information objects conveyed within the application layer
ITU-T X.209-1989 history
1989ITU-T X.209-1989 Specification of Basic Encoding Rules for Abstract Syntax Notation One (ASN.1) - Data Communication Networks - Open Systems Interconnection (OSI) Model and Notation, Service Definition (Study Group VII) 21 pp