X.500 Standard status
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Document Structure and Mapping between ITU-T and ISO/IEC

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Standard

Information technology – Open Systems Interconnection –
The Directory: Overview of Concepts, Models, and Services

ITU-T Rec. X.500

ISO/IEC 9594-1

Information technology – Open Systems Interconnection –
The Directory: Models

ITU-T Rec. X.501

ISO/IEC 9594-2

Information technology – Open Systems Interconnection –
The Directory: Public-Key and Attribute Certificate Frameworks

ITU-T Rec. X.509

ISO/IEC 9594-8

Information technology – Open Systems Interconnection –
The Directory: Abstract Service Definition

ITU-T Rec. X.511

ISO/IEC 9594-3

Information technology – Open Systems Interconnection –
The Directory: Procedures for Distributed Operation

ITU-T Rec. X.518

ISO/IEC 9594-4

Information technology – Open Systems Interconnection –
The Directory: Protocol Specifications

ITU-T Rec. X.519

ISO/IEC 9594-5

Information technology – Open Systems Interconnection –
The Directory: Selected Attribute Types

ITU-T Rec. X.520

ISO/IEC 9594-6

Information technology – Open Systems Interconnection –
The Directory: Selected Object Classes

ITU-T Rec. X.521

ISO/IEC 9594-7

Information technology – Open Systems Interconnection –
The Directory: Replication

ITU-T Rec. X.525

ISO/IEC 9594-9

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