Information technology - Open systems interconnection - Part 2: The Directory: Models - Amendment 1

Technologies de l'information — Interconnexion de systèmes ouverts (OSI) — Partie 2: Titre manque — Amendement 1

General Information

Status
Published
Publication Date
16-Dec-2021
ICS
35.100.70 - Application layer
Technical Committee
ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
Drafting Committee
ISO/IEC JTC 1/SC 6/WG 10 - Directory, ASN.1 and Registration
Current Stage
6060 - International Standard published
Start Date
17-Dec-2021
Due Date
02-Feb-2023
Completion Date
17-Dec-2021

Relations

Amends
ISO/IEC 9594-2:2020 - Information technology - Open systems interconnection - Part 2: The Directory: Models
Effective Date
24-Apr-2021

Overview

ISO/IEC 9594-2:2020/Amd 1:2021 is a key amendment to the international standard addressing information technology within the Open Systems Interconnection (OSI) framework. It specifically focuses on Part 2 of the directory service standard, titled "The Directory: Models." This amendment introduces miscellaneous enhancements aimed at refining directory models to improve interoperability and precision in identifying entities across networks.

Developed collaboratively by ISO, IEC, and the ITU-T under established editorial and approval procedures, this amendment reflects the latest consensus on directory structure in telecommunications and information exchange systems. It updates the definition and handling of directory names, including support for internationalized domain names, and extends object identifier usage.

Key Topics

  • Name Data Type Redefinition
    This amendment revises the Name syntax to include a choice among three types:

    • rdnSequence (Relative Distinguished Names sequence) for traditional distinguished naming
    • dnsName for Domain Name System (DNS) domain names, including internationalized domain names (IDNs) as specified in IETF RFC 5890
    • oid as an Object Identifier representing unique entities

  • Domain Name Formats and Constraints
    Detailed constraints define three domain name formats:

    1. Basic Latin-only labels (ASCII) without the "xn--" prefix, adhering to length limits
    2. ASCII-compatible encoding labels (A-label) prefixed with "xn--," converted via the Punycode algorithm (RFC 3492)
    3. Unicode labels (U-label) supporting characters beyond Basic Latin, convertible back to A-labels, compliant with restricted Unicode repertoire (RFC 5892)

  • Extension of Object Identifier Categories
    The amendment adds new object identifier categories such as wrapperProtocolType and algorithm within directory information objects, enhancing the semantic richness and classification in directory services.

  • Synonyms for Simplified Reference
    Defines new synonyms like id-wrprot for wrapperProtocolType and id-algo for algorithm to streamline referencing in directory protocols.

Applications

  • Telecommunications Systems
    This amendment supports standardized directory models critical for telecommunication infrastructures where entity identification and interoperability are vital. The inclusion of internationalized domain names allows global, multilingual access to directory resources.

  • Network Security and Identity Management
    Improved naming conventions and object identifiers facilitate precise authentication and authorization mechanisms in large-scale distributed systems.

  • Enterprise Directory Services
    Organizations implementing directory protocols benefit from updated models that allow flexible naming options, including traditional distinguished names and DNS-based names conducive to integration with internet technologies.

  • Software and Protocol Development
    Developers designing directory-enabled applications and network protocols can leverage these enhancements to ensure compliance with international standards, improving cross-vendor compatibility.

Related Standards

  • ISO/IEC 9594 Series
    ISO/IEC 9594 constitutes the foundation of directory services in OSI, with multiple parts detailing models, abstract services, protocols, and authentication frameworks.

  • ITU-T Recommendation X.501
    This amendment aligns with ITU-T X.501 (2019)/Amd 1 (2021), detailing directory models and naming conventions in telecommunication networks.

  • IETF RFC 5890 - Internationalized Domain Names
    Key specification for handling international domain names supporting Unicode characters critical for DNS name integration.

  • IETF RFC 3492 - Punycode Algorithm
    Essential for conversion between Unicode domain names and ASCII-compatible labels, enabling internationalized domain names in DNS.

  • IETF RFC 5892 - Unicode Code Points for IDNs
    Defines the allowed Unicode repertoire for domain names, ensuring interoperability and security in internationalized contexts.

This amendment to ISO/IEC 9594-2 provides crucial updates enhancing directory models to accommodate modern network naming schemes and improve the robustness of directory services globally. It is an essential standard for entities involved in telecommunications, information technology, and systems interoperability focused on directory infrastructure.

ISO/IEC 9594-2:2020/Amd 1:2021 - Information technology — Open systems interconnection — Part 2: The Directory: Models — Amendment 1 Released:12/17/2021 - Page 1 previewISO/IEC 9594-2:2020/Amd 1:2021 - Information technology — Open systems interconnection — Part 2: The Directory: Models — Amendment 1 Released:12/17/2021 - Page 2 previewISO/IEC 9594-2:2020/Amd 1:2021 - Information technology — Open systems interconnection — Part 2: The Directory: Models — Amendment 1 Released:12/17/2021 - Page 3 previewISO/IEC 9594-2:2020/Amd 1:2021 - Information technology — Open systems interconnection — Part 2: The Directory: Models — Amendment 1 Released:12/17/2021 - Page 4 preview
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ISO/IEC 9594-2:2020/Amd 1:2021 - Information technology — Open systems interconnection — Part 2: The Directory: Models — Amendment 1 Released:12/17/2021

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Frequently Asked Questions

ISO/IEC 9594-2:2020/Amd 1:2021 is a standard published by the International Organization for Standardization (ISO). Its full title is "Information technology - Open systems interconnection - Part 2: The Directory: Models - Amendment 1". This standard covers: Information technology - Open systems interconnection - Part 2: The Directory: Models - Amendment 1

Information technology - Open systems interconnection - Part 2: The Directory: Models - Amendment 1

ISO/IEC 9594-2:2020/Amd 1:2021 is classified under the following ICS (International Classification for Standards) categories: 35.100.70 - Application layer. The ICS classification helps identify the subject area and facilitates finding related standards.

ISO/IEC 9594-2:2020/Amd 1:2021 has the following relationships with other standards: It is inter standard links to ISO/IEC 9594-2:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

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Standards Content (Sample)


INTERNATIONAL ISO/IEC
STANDARD 9594-2
Ninth edition
2020-11
AMENDMENT 1
Ninth edition
2021-12
Information technology — Open
systems interconnection —
Part 2:
The Directory: Models
AMENDMENT 1
Reference number
ISO/IEC 9594-2:2020/Amd. 1:2021(E)
© ISO/IEC 2021
ISO/IEC 9594-2:2020/Amd. 1:2021(E)
© ISO/IEC 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
© ISO/IEC 2021 – All rights reserved

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
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ISO and IEC technical committees collaborate in fields of mutual interest. Other international
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The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
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Attention is drawn to the possibility that some of the elements of this document may be the subject of
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see www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by ITU-T [as ITU-T REC. X.501 (2019) – Amendment 1] and drafted in
accordance with its editorial rules, in collaboration with Joint Technical Committee ISO/IEC JTC 1,
Information technology, Subcommittee SC 6, Telecommunications and information exchange between
systems.
A list of all parts in the ISO/IEC 9594 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national-
committees.
© ISO/IEC 2021 – All rights reserved iii

ISO/IEC 9594-2:2020/Amd. 1:2021(E)
Information Technology – Open systems Interconnection – The Directory: Models
Amendment 1
Miscellaneous enhancements
Summary
Amendment 1 to Rec. ITU-T X.501 (2019) | ISO/IEC 9594-2:2020 updates clause 9.2 and Annex A.
The amendment has successfully gone through the enquiry state at ISO/IEC and ISO/IEC does not anymore accept any
technical comments. ITU-T SG 17 members have been part of the ISO/IEC ballot process and have had ample opportunities
in the past to influence the technical content.
History
*
Edition Recommendation Approval Study Group Unique ID
1.0 ITU-T X.501 1988-11-25 11.1002/1000/2997
2.0 ITU-T X.501 1993-11-16 7 11.1002/1000/2998
3.0 ITU-T X.501 1997-08-09 7 11.1002/1000/4122
3.1 ITU-T X.501 (1997) Technical Cor. 1 2000-03-31 7 11.1002/1000/5031
3.2 ITU-T X.501 (1997) Amd. 1 2000-03-31 7 11.1002/1000/5030
3.3 ITU-T X.501 (1997) Technical Cor. 2 2001-02-02 7 11.1002/1000/5308
3.4 ITU-T X.501 (1997) Technical Cor. 3 2005-05-14 17 11.1002/1000/8499
4.0 ITU-T X.501 2001-02-02 7 11.1002/1000/5310
4.1 ITU-T X.501 (2001) Technical Cor. 1 2005-05-14 17 11.1002/1000/8500
4.2 ITU-T X.501 (2001) Technical Cor. 2 2005-11-29 17 11.1002/1000/8634
4.3 ITU-T X.501 (2001) Cor. 3 2008-05-29 17 11.1002/1000/9431
5.0 ITU-T X.501 2005-08-29 17 11.1002/1000/8489
5.1 ITU-T X.501 (2005) Cor. 1 2008-05-29 17 11.1002/1000/9432
5.2 ITU-T X.501 (2005) Cor. 2 2008-11-13 17 11.1002/1000/9589
5.3 ITU-T X.501 (2005) Cor. 3 2011-02-13 17 11.1002/1000/11040
5.4 ITU-T X.501 (2005) Cor. 4 2012-04-13 17 11.1002/1000/11575
6.0 ITU-T X.501 2008-11-13 17 11.1002/1000/9588
6.1 ITU-T X.501 (2008) Cor. 1 2011-02-13 17 11.1002/1000/11041
6.2 ITU-T X.501 (2008) Cor. 2 2012-04-13 17 11.1002/1000/11576
6.3 ITU-T X.501 (2008) Cor. 3 2012-10-14 17 11.1002/1000/11734
7.0 ITU-T X.501 2012-10-14 17 11.1002/1000/11733
8.0 ITU-T X.501 2016-10-14 17 11.1002/1000/13030
9.0 ITU-T X.501 2019-10-14 17 11.1002/1000/14032
9.1 ITU-T X.501 (2019) Amd. 1 2021-10-14 17 11.1002/1000/14790
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