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ITU-T X.521

Information technology – Open Systems Interconnection – The Directory: Selected object classes

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Organization: ITU-T
Publication Date: 1 October 2019
Status: active
Page Count: 40
scope:

This Recommendation | International Standard defines a number of object classes and name forms which may be found useful across a range of applications of the Directory. The definition of an object class involves listing a number of attribute types which are relevant to objects of that class. The definition of a name form involves naming the object class to which it applies and listing the attributes to be used in forming names for objects of that class. These definitions are used by the administrative authority which is responsible for the management of the directory information.

Any administrative authority can define its own object classes or subclasses and name forms for any purpose.

NOTE 1 - Those definitions may or may not use the notation specified in Rec. ITU-T X.501 | ISO/IEC 9594-2.

NOTE 2 - It is recommended that an object class defined in this Recommendation | International Standard, or a subclass derived from one, or a name form defined in this Recommendation | International Standard, be used in preference to the generation of a new one, whenever the semantics is appropriate for the application.

Administrative authorities may support some or all the selected object classes and name forms, and may also add additional ones.

All administrative authorities shall support the object classes which the directory uses for its own purpose (the top, alias and Directory system agent (DSA) object classes).

Document History

ITU-T X.521
October 1, 2019
Information technology – Open Systems Interconnection – The Directory: Selected object classes
This Recommendation | International Standard defines a number of object classes and name forms which may be found useful across a range of applications of the Directory. The definition of an object...
October 1, 2016
Information technology – Open Systems Interconnection – The Directory: Selected object classes
This Recommendation | International Standard defines a number of object classes and name forms which may be found useful across a range of applications of the Directory. The definition of an object...
April 1, 2012
Information technology – Open Systems Interconnection – The Directory: Selected object classes Technical Corrigendum 1
A description is not available for this item.
April 1, 2012
Information technology – Open Systems Interconnection – The Directory: Selected object classes Technical Corrigendum 1
A description is not available for this item.
November 1, 2008
Information technology – Open Systems Interconnection – The Directory: Selected attribute types
A description is not available for this item.
August 1, 2005
Information Technology - Open Systems Interconnection - The Directory: Selected Object Classes
A description is not available for this item.
February 1, 2001
Information Technology - Open Systems Interconnection - The Directory: Selected Object Classes Series X: Data Networks and Open System Communications Directory
A description is not available for this item.
February 1, 2001
Information Technology - Open Systems Interconnection - The Directory: Selected Object Classes Series X: Data Networks and Open System Communications Directory
A description is not available for this item.
August 1, 1997
Information Technology - Open Systems Interconnection - The Directory: Selected Object Classes Series X: Data Networks and Open System Communications Directory
A description is not available for this item.
January 1, 1993
Information Technology - Open Systems Interconnection - The Directory: Selected Object Classes - Data Networks and Open System Communications Directory
A description is not available for this item.
January 1, 1989
Directory - Selected Object Classes - Data Communication Networks Directory (Study Group VII) 14 pp
A description is not available for this item.

References

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