Information technology — Open Systems Interconnection — The Directory: Selected attribute types — Part 6:

ISO/IEC 9594-6:2008 defines a number of attribute types and matching rules which may be found useful across a range of applications of the Directory. Attribute types and matching rules fall into the following three categories: Some attribute types and matching rules are used by a wide variety of applications or are understood and/or used by the Directory itself. (It is recommended that an attribute type or matching rule defined in ISO/IEC 9594-6:2008 be used, in preference to the generation of a new one, whenever it is appropriate for the application.) Some attribute types and matching rules are internationally standardized, but are application-specific. These are defined in the standards associated with the application concerned. Any administrative authority can define its own attribute types and matching rules for any purpose. These are not internationally standardized, and are available to others beyond the administrative authority which created them only by bilateral agreement.

Technologies de l'information — Interconnexion de systèmes ouverts (OSI) — L'annuaire: Types d'attributs sélectionnés — Partie 6:

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INTERNATIONAL ISO/IEC
STANDARD 9594-6
Sixth edition
2008-12-15


Information technology — Open Systems
Interconnection — The Directory:
Selected attribute types
Technologies de l'information — Interconnexion de systèmes ouverts
(OSI) — L'annuaire: Types d'attributs sélectionnés




Reference number
ISO/IEC 9594-6:2008(E)
©
ISO/IEC 2008

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ISO/IEC 9594-6:2008(E)
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©  ISO/IEC 2008
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
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ii © ISO/IEC 2008 – All rights reserved

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ISO/IEC 9594-6:2008(E)

CONTENTS
Page
Foreword .    v
Introduction .   vi
SECTION 1 – GENERAL . 1
1 Scope. 1
2 Normative references . 1

2.1 Identical Recommendations | International Standards. 1
2.2 Other references. 2
2.3 ISO/IEC Standards . 2
3 Definitions . 3
4 Abbreviations . 3
5 Conventions . 3
SECTION 2 – SELECTED ATTRIBUTE TYPES. 4
6 Definition of selected attribute types . 4
6.1 System attribute types . 4
6.2 Labelling attribute types . 4
6.3 Geographical Attribute Types. 7
6.4 Organizational attribute types . 8
6.5 Explanatory attribute types. 9
6.6 Postal Addressing attribute types. 10
6.7 Telecommunications Addressing attribute types. 12
6.8 Preferences attribute types . 15
6.9 OSI Application attribute types. 15
6.10 Relational attribute types . 16
6.11 Domain attribute types . 17
6.12 Attributes applications using tag-based identification . 17
6.13 Notification attributes . 18
SECTION 3 – MATCHING RULES . 23
7 String preparation. 23
7.1 Transcode. 23
7.2 Map. 23
7.3 Normalize. 23
7.4 Prohibit. 23
7.5 Check bidi . 24
7.6 Insignificant Character Removal . 24
8 Definition of matching rules . 24
8.1 String matching rules. 24
8.2 Syntax-based matching rules . 27
8.3 Time matching rules . 30
8.4 First component matching rules . 31
8.5 Word matching rules. 31
8.6 Approximate Matching Rules . 34
8.7 Special Matching Rules. 34
8.8 Zonal Match. 34
SECTION 4 – CONTEXTS . 38
9 Definition of Context Types . 38
9.1 Language Context . 38
9.2 Temporal Context . 38
9.3 Locale Context . 41
9.4 LDAP Attribute Option Context. 41
© ISO/IEC 2008 – All rights reserved iii

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ISO/IEC 9594-6:2008(E)
Page

Annex A – Selected attribute types in ASN.1. 43


Annex B – Summary of attribute types. 61
Annex C – Upper bounds. 62

Annex D – Alphabetical index of attributes, matching rules and contexts . 63
Annex E – Examples for zonal match matching rules . 65
Annex F – ASN.1 module from ITU-T Rec. X.660 | ISO/IEC 9834-1. 67
Annex G – Tag-based applications as they relate to these Directory Specifications . 68
G.1 The concept of a tag-based application . 68
G.2 RFID example. 68
G.3 DIT structure for entries representing object identifier components. 70
Annex H – Amendments and corrigenda. 72


iv © ISO/IEC 2008 – All rights reserved

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ISO/IEC 9594-6:2008(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members of
ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information
technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of the joint technical committee is to prepare International Standards. Draft International
Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as
an International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
ISO/IEC 9594-6:2008 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 6, Telecommunications and information exchange between systems, in collaboration with
ITU-T. The identical text is published as ITU-T Rec. X.520 (11/2008).
This sixth edition cancels and replaces the fifth edition (ISO/IEC 9594-6:2005), which has been technically
revised.
ISO/IEC 9594 consists of the following parts, under the general title Information technology — Open Systems
Interconnection — The Directory:
⎯ Part 1: Overview of concepts, models and services
⎯ Part 2: Models
⎯ Part 3: Abstract service definition
⎯ Part 4: Procedures for distributed operation
⎯ Part 5: Protocol specifications
⎯ Part 6: Selected attribute types
⎯ Part 7: Selected object classes
⎯ Part 8: Public-key and attribute certificate frameworks
⎯ Part 9: Replication
⎯ Part 10: Use of systems management for administration of the Directory


© ISO/IEC 2008 – All rights reserved v

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ISO/IEC 9594-6:2008(E)

Introduction
This Recommendation | International Standard, together with other Recommendations | International Standards, has
been produced to facilitate the interconnection of information processing systems to provide directory services. A set of
such systems, together with the directory information that they hold, can be viewed as an integrated whole, called the

Directory. The information held by the Directory, collectively known as the Directory Information Base (DIB), is
typically used to facilitate communication between, with or about objects such as application entities, people, terminals,

and distribution lists.
The Directory plays a significant role in Open Systems Interconnection, whose aim is to allow, with a minimum of
technical agreement outside of the interconnection standards themselves, the interconnection of information processing
systems:
– from different manufacturers;
– under different managements;
– of different levels of complexity; and
– of different ages.
This Recommendation | International Standard defines a number of attribute types which may be found useful across a
range of applications of the Directory, as well as a number of standard attribute syntaxes and matching rules. One
particular use for many of the attributes defined herein is in the formation of names, particularly for the classes of object
defined in ITU-T Rec. X.521 | ISO/IEC 9594-7.
This Recommendation | International Standard provides the foundation frameworks upon which industry profiles can be
defined by other standards groups and industry forums. Many of the features defined as optional in these frameworks
may be mandated for use in certain environments through profiles. This sixth edition technically revises and enhances,
but does not replace, the fifth edition of this Recommendation | International Standard. Implementations may still claim
conformance to the fifth edition. However, at some point, the fifth edition will not be supported (i.e., reported defects
will no longer be resolved). It is recommended that implementations conform to this sixth edition as soon as possible.
This sixth edition specifies versions 1 and 2 of the Directory protocols.
The first and second editions specified only version 1. Most of the services and protocols specified in this edition are
designed to function under version 1. However some enhanced services and protocols, e.g., signed errors, will not
function unless all Directory entities involved in the operation have negotiated version 2. Whichever version has been
negotiated, differences between the services and between the protocols defined in the six editions, except for those
specifically assigned to version 2, are accommodated using the rules of extensibility defined in ITU-T Rec. X.519 |
ISO/IEC 9594-5.
Annex A, which is an integral part of this Recommendation | International Standard, provides the ASN.1 notation for
the complete module which defines the attributes, attribute syntaxes, and matching rules.
Annex B, which is not an integral part of this Recommendation | International Standard, provides a table of attribute
types, for easy reference.
Annex C, which is not an integral part of this Recommendation | International Standard, provides an example of upper
bounds value constraints.
Annex D, which is not an integral part of this Recommendation | International Standard, lists alphabetically the
attributes and matching rules defined in this Directory Specification.
Annex E, which is not an integral part of this Recommendation | International Standard, gives examples relevant to the
definition of zonal matching.
Annex F, which is not an integral part of this Recommendation | International Standard, provides a copy of an ASN.1
module specified in ITU-T Rec. X.660 | ISO/IEC 9834-1.
Annex G, which is not an integral part of this Recommendation | International Standard, provides a short tutorial on
ID-based applications.
Annex H, which is not an integral part of this Recommendation | International Standard, lists the amendments and
defect reports that have been incorporated to form this edition of this Recommendation | International Standard.

vi © ISO/IEC 2008 – All rights reserved

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ISO/IEC 9594-6:2008 (E)
INTERNATIONAL STANDARD
ITU-T RECOMMENDATION
Information technology – Open Systems Interconnection –
The Directory: Selected attribute types
SECTION 1 – GENERAL
1 Scope
This Recommendation | International Standard defines a number of attribute types and matching rules which may be
found useful across a range of applications of the Directory.
Attribute types and matching rules fall into three categories, as described below.
Some attribute types and matching rules are used by a wide variety of applications or are understood and/or used by the
Directory itself.
NOTE – It is recommended that an attribute type or matching rule defined in this Recommendation | International Standard be
used, in preference to the generation of a new one, whenever it is appropriate for the application.
Some attribute types and matching rules are internationally standardized, but are application-specific. These are defined
in the standards associated with the application concerned.
Any administrative authority can define its own attribute types and matching rules for any purpose. These are not
internationally standardized, and are available to others beyond the administrative authority which created them only by
bilateral agreement.
2 Normative references
The following Recommendations and International Standards contain provisions which, through reference in this text,
constitute provisions of this Recommendation | International Standard. At the time of publication, the editions indicated
were valid. All Recommendations and Standards are subject to revision, and parties to agreements based on this
Recommendation | International Standard are encouraged to investigate the possibility of applying the most recent
edition of the Recommendations and Standards listed below. Members of IEC and ISO maintain registers of currently
valid International Standards. The Telecommunication Standardization Bureau of the ITU maintains a list of currently
valid ITU-T Recommendations.
2.1 Identical Recommendations | International Standards
– ITU-T Recommendation X.200 (1994) | ISO/IEC 7498-1:1994, Information technology – Open Systems
Interconnection – Basic Reference Model: The Basic Model.
– ITU-T Recommendation X.500 (2008) | ISO/IEC 9594-1:2008, Information technology – Open Systems
Interconnection – The Directory: Overview of concepts, models and services.
– ITU-T Recommendation X.501 (2008) | ISO/IEC 9594-2:2008, Information technology – Open Systems
Interconnection – The Directory: Models.
– ITU-T Recommendation X.509 (2008) | ISO/IEC 9594-8:2008, Information technology – Open Systems
Interconnection – The Directory: Public-key and attribute certificate frameworks.
– ITU-T Recommendation X.511 (2008) | ISO/IEC 9594-3:2008, Information technology – Open Systems
Interconnection – The Directory: Abstract service definition.
– ITU-T Recommendation X.518 (2008) | ISO/IEC 9594-4:2008, Information technology – Open Systems
Interconnection – The Directory: Procedures for distributed operation.
– ITU-T Recommendation X.519 (2008) | ISO/IEC 9594-5:2008, Information technology – Open Systems
Interconnection – The Directory: Protocol specifications.
– ITU-T Recommendation X.521 (2008) | ISO/IEC 9594-7:2008, Information technology – Open Systems
Interconnection – The Directory: Selected object classes.
– ITU-T Recommendation X.525 (2008) | ISO/IEC 9594-9:2008, Information technology – Open Systems
Interconnection – The Directory: Replication.
 ITU-T Rec. X.520 (11/2008) 1

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ISO/IEC 9594-6:2008 (E)
– ITU-T Recommendation X.530 (2008) | ISO/IEC 9594-10:2008, Information technology – Open Systems
Interconnection – The Directory: Use of systems management for administration of the Directory.
– ITU-T Recommendation X.660 (2008) | ISO/IEC 9834-1:2008, Information technology – Open Systems
Interconnection – Procedures for the operation of OSI Registration Authorities: General procedures and
top arcs of the ASN.1 Object Identifier tree.
– ITU-T Recommendation X.667 (2008) | ISO/IEC 9834-8:2008, Information technology – Open Systems
Interconnection – Procedures for the operation of OSI Registration Authorities: Generation and
registration of Universally Unique Identifiers (UUIDs) and their use as ASN.1 object identifier
components.
– ITU-T Recommendation X.668 (2008) | ISO/IEC 9834-9:2008, Information technology – Open Systems
Interconnection – Procedures for the operation of OSI Registration Authorities: Registration of object
identifier arcs for applications and services using tag-based identification.
– ITU-T Recommendation X.680 (2008) | ISO/IEC 8824-1:2008, Information technology – Abstract Syntax
Notation One (ASN.1): Specification of basic notation.
– ITU-T Recommendation X.681 (2008) | ISO/IEC 8824-2:2008, Information technology – Abstract Syntax
Notation One (ASN.1): Information object specification.
– ITU-T Recommendation X.682 (2008) | ISO/IEC 8824-3:2008, Information technology – Abstract Syntax
Notation One (ASN.1): Constraint specification.
– ITU-T Recommendation X.683 (2008) | ISO/IEC 8824-4:2008, Information technology – Abstract Syntax
Notation One (ASN.1): Parameterization of ASN.1 specifications.
2.2 Other references
– ITU-T Recommendation E.123 (2001), Notation for national and international telephone numbers, e-mail
addresses and Web addresses.
– ITU-T Recommendation E.164 (2005), The international public telecommunication numbering plan.
– ITU-T Recommendation F.1 (1998), Operational provisions for the international public telegram service.
– CCITT Recommendation F.31 (1988), Telegram retransmission system.
– CCITT Recommendation F.401 (1992), Message handling services: Naming and addressing for public
message handling services.
– ITU-T Recommendation T.30 (2005), Procedures for document facsimile transmission in the general
switched telephone network.
– ITU-T Recommendation T.62 (1993), Control procedures for teletex and Group 4 facsimile services.
– ITU-T Recommendation X.121 (2000), International numbering plan for public data networks.
– ITU-T Recommendation Y.2213 (2008), NGN service requirements and capabilities for network aspects
of applications and services using tag-based identification.
– ISO 3166-1:2006, Codes for the representation of names of countries and their subdivisions – Part 1:
Country codes.
– ISO 3166-3:2006, Codes for the representation of names of countries and their subdivisions – Part 3:
Code for formerly used names of countries.
– ISO 639-2:1998, Codes for the representation of names of languages – Part 2: Alpha-3 code.
– ISO/IEC 9945-3:2003, Information technology – Portable Operating System Interface (POSIX) – Part
3: Shell and Utilities.
– IETF RFC 3377 (2002), Lightweight Directory Access Protocol (v3): Technical Specification.
– IETF RFC 3454 (2002), Preparation of Internationalized Strings (stringprep).
– The Unicode Consortium. The Unicode Standard, Version 4.0, defined by: The Unicode Standard,
Version 4.0 (Reading, MA, Addison-Wesley, 2003. ISBN 0-321-18578-1).
– Unicode Standard Annex #15: Unicode Normalization Forms, by Mark Davis and Martin Dürst. An
integral part of The Unicode Standard, Version 4.0.
2.3 ISO/IEC Standards
– ISO/IEC 10646:2003, Information technology – Universal Multiple-Octet Coded Character Set (UCS).
2 ITU-T Rec. X.520 (11/2008)

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ISO/IEC 9594-6:2008 (E)
3 Definitions
For the purposes of this Recommendation | International Standard, the following definitions apply:
The following terms are defined in ITU-T Rec. X.501 | ISO/IEC 9594-2:
a) attribute type;
b) object class;
c) matching rule;
d) context.
4 Abbreviations
For the purposes of this Recommendation | International Standard, the following abbreviations apply:
LDAP Lightweight Directory Access Protocol
RFID Radio Frequency Identification
UII Unique Item Identifier
URL Uniform Resource Locator
URN Uniform Resource Name
UUID Universally Unique Identifier
5 Conventions
The term "Directory Specification" (as in "this Directory Specification") shall be taken to mean ITU-T Rec. X.520 |
ISO/IEC 9594-6. The term "Directory Specifications" shall be taken to mean the X.500-series Recommendations and all
parts of ISO/IEC 9594.
This Directory Specification uses the term first edition systems to refer to systems conforming to the first edition of the
Directory Specifications, i.e., the 1988 edition of the series of CCITT X.500 Recommendations and the
ISO/IEC 9594:1990 edition.
This Directory Specification uses the term second edition systems to refer to systems conforming to the second edition of
the Directory Specifications, i.e., the 1993 edition of the series of ITU-T X.500 Recommendations and the
ISO/IEC 9594:1995 edition.
This Directory Specification uses the term third edition systems to refer to systems conforming to the third edition of the
Directory Specifications, i.e., the 1997 edition of the series of ITU-T X.500 Recommendations and the ISO/IEC
9594:1998 edition.
This Directory Specification uses the term fourth edition systems to refer to systems conforming to the fourth edition of
the Directory Specifications, i.e., the 2001 editions of ITU-T Recs X.500, X.501, X.511, X.518, X.519, X.520, X.521,
X.525, and X.530, the 2000 edition of ITU-T Rec. X.509, and parts 1-10 of the ISO/IEC 9594:2001 edition.
This Directory Specification uses the term fifth edition systems to refer to systems conforming to the fifth edition of the
Directory Specifications, i.e., the 2005 edition of the series of ITU-T X.500 Recommendations and the
ISO/IEC 9594:2005 edition.
This Directory Specification uses the term sixth edition systems to refer to systems conforming to the sixth edition of the
Directory Specifications, i.e., the 2008 edition of the series of ITU-T X.500 Recommendations and the
ISO/IEC 9594:2008 edition.
This Directory Specification presents ASN.1 notation in the bold Helvetica typeface. When ASN.1 types and values are
referenced in normal text, they are differentiated from normal text by presenting them in the bold Helvetica typeface.
The names of procedures, typically referenced when specifying the semantics of processing, are differentiated from
normal text by displaying them in bold Times. Access control permissions are presented in italicized Times.
If the items in a list are numbered (as opposed to using "–" or letters), then the items shall be considered steps in a
procedure.
Attribute types, matching rules and context types are defined in this Recommendation | International Standard by use of
the ATTRIBUTE, MATCHING-RULE and CONTEXT information object classes defined in ITU-T Rec. X.501 |
ISO/IEC 9594-2.
 ITU-T Rec. X.520 (11/2008) 3

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ISO/IEC 9594-6:2008 (E)
Examples of the use of the attribute types are described using an informal notation, where attribute type and value pairs
are represented by an acronym for the attribute type, followed by an equals sign ("="), followed by the example value for
the attribute.
SECTION 2 – SELECTED ATTRIBUTE TYPES
6 Definition of selected attribute types
This Directory Specification defines a number of attribute types which may be found useful across a range of
applications of the Directory.
Many of the attribute types defined in this Directory Specification are based on a common ASN.1 syntax:

UnboundedDirectoryString ::= CHOICE {
teletexString   TeletexString (SIZE(1.MAX)),
printableString PrintableString (SIZE (1.MAX)),
bmpString  BMPString (SIZE (1.MAX)),
universalString UniversalString (SIZE (1.MAX)),
uTF8String  UTF8String (SIZE (1.MAX)) }
A few attribute types are based on the following syntax:

DirectoryString { INTEGER : maxSize } ::= CHOICE {
teletexString   TeletexString (SIZE (1.maxSize)),
printableString PrintableString (SIZE (1.maxSize)),
bmpString  BMPString (SIZE (1.maxSize)),
universalString UniversalString (SIZE (1.maxSize)),
uTF8String  UTF8String (SIZE (1.maxSize)) }
NOTE – The above syntaxes are also used in other parts of these Directory Specifications.
Some implementations of the Directory may not support UniversalString, BMPString, or UTF8String, and may not be
able to generate, match, shadow, or display attributes with these syntax types.
6.1 System attribute types
6.1.1 Knowledge Information
The Knowledge Information attribute type specifies a human readable accumulated description of knowledge mastered
by a specific DSA.
NOTE – This attribute is now obsolete.

knowledgeInformation ATTRIBUTE ::= {
WITH SYNTAX   UnboundedDirectoryString
EQUALITY MATC
...

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