ITU-T Recommendation X.500 | ISO/IEC 9594-1 introduces the concepts of the Directory and the DIB (Directory Information Base) and overviews the services and capabilities which they provide.
ITU-T X.500-2008 Referenced Document
ITU-T X.200-1994 Information Technology - Open Systems Interconnection - Basic Reference Model: the Basic Model - Data Networks and Open System Communications Open Systems Interconnection - Model and Notation 64 pp
ITU-T X.501-2008 Information technology – Open Systems Interconnection – The Directory: Models
ITU-T X.509-2008 Information technology – Open systems interconnection – The Directory: Public-key and attribute certificate frameworks (Study Group 17)
ITU-T X.511-2008 Information technology – Open Systems Interconnection – The Directory: Abstract service definition
ITU-T X.518-2008 Information technology Open Systems Interconnection The Directory: Procedures for distributed operation Study Group 17
ITU-T X.519-2008 Information technology – Open Systems Interconnection – The Directory: Protocol specifications
ITU-T X.520-2008 Information technology – Open Systems Interconnection – The Directory: Selected attribute types (Study Group 17)
ITU-T X.521-2008 Information technology – Open Systems Interconnection – The Directory: Selected attribute types
ITU-T X.525-2008 Information technology – Open Systems Interconnection – The Directory: Replication (Study Group 17)
ITU-T X.530-2008 Information technology – Open Systems Interconnection – The Directory: Use of systems management for administration of the Directory (Study Group 17)
ITU-T X.500-2008 history
2008ITU-T X.500-2008 Information technology Open Systems Interconnection The Directory: Overview of concepts models and services Study Group 17