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ITU-T X.521 (10/2019)

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Information technology – Open Systems Interconnection – The Directory: Selected object classes
Recommendation ITU-T X.521 | ISO/IEC 9594-7 defines a number of selected object classes and name forms which may be found useful across a range of applications of the Directory. An object class definition specifies the attribute types which are relevant to the objects of that class. A name form definition specifies the attributes to be used in forming names for the objects of a given class.
Citation: https://handle.itu.int/11.1002/1000/14038
Series title: X series: Data networks, open system communications and security
  X.500-X.599: Directory
Approval date: 2019-10-14
Identical standard:ISO/IEC 9594-7 (Common)
Approval process:AAP
Status: In force
Maintenance responsibility: ITU-T Study Group 17
Further details: Patent statement(s)
Development history
Ed. ITU-T Recommendation Status Summary Table of Contents Download
9 X.521 (10/2019) In force
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8 X.521 (10/2016) Superseded
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7 X.521 (10/2012) Superseded
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6.1 X.521 (2008) Cor. 1 (04/2012) Superseded - - here
6 X.521 (11/2008) Superseded
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5.1 X.521 (2005) Cor. 1 (04/2012) Superseded - - here
5 X.521 (08/2005) Superseded
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4 X.521 (02/2001) Superseded
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3.2 X.521 (1997) Technical Cor. 1 (02/2001) Superseded - - here
3.1 X.521 (1997) Amd. 1 (03/2000) Superseded
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3 X.521 (08/1997) Superseded
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2 X.521 (11/1993) Superseded - - here
1 X.521 (11/1988) Superseded -
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