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Versions: 00 RFC 3937

                         URN Namespace for IPTC           November 2003


Network Working Group
Internet Draft                                                M. Steidl
Document: draft-steidl-iptc-urn-00.txt                             IPTC
Expires: May 2004                                         November 2003


                 A Uniform Resource Name(URN)Namespace for
         the International Press Telecommunications Council (IPTC)


Status of this Memo
   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026 [i].
   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.
   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as ôwork in progress.ö
   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt
   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.


Abstract
   This document describes a URN (Uniform Resource Name) namespace for
   identifying persistent resources published by the International Press
   Telecommunications Council, IPTC. These resources include XML Data
   Type Definition files (DTD), XML Schema, Namespaces in XML, XSL
   stylesheets, other XML based document and documents of other data
   formats like PDF documents, Microsoft Office documents and others.


Table of Contents
   1. Introduction...................................................2
   2. IANA URN Specification Template................................2
      2.1 Namespace ID...............................................2
      2.2 Registration Information...................................2
      2.3 Declaration of syntactic structure.........................3
      2.4 Relevant ancillary documentation...........................4
      2.5 Identifier uniqueness considerations.......................4
      2.6 Identifier persistence considerations......................4
      2.7 Process of identifier assignment...........................5
      2.8 Process for identifier resolution..........................5
      2.9 Rules for Lexical Equivalence..............................5
      2.10 Conformance with URN Syntax...............................5


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      2.11 Validation mechanism......................................5
      2.12 Scope.....................................................5
   3. Examples.......................................................5
   4. Namespace Considerations and Community Considerations..........6
   5. Security Considerations........................................7
   6. IANA Considerations............................................7
   References........................................................7
   AuthorÆs Addresses................................................7


1. Introduction

   The International Press Telecommunications Council (IPTC) is a non-
   profit consortium of the world's major news agencies and news
   industry vendors. It develops and maintains technical standards for
   the news business that are used by virtually every major news
   organization in the world. IPTC was established in 1965.

   Since the 1990's IPTC's standardization work is based on open
   standards like first SGML, then the XML family of standards, MIME,
   Unicode etc.

   As some of these standards require identification of resources IPTC
   was looking for a technology for globally unique, persistent and
   location-independent identifiers and decided to implement URNs as
   described in "URN Syntax" [RFC 2141] for this reason.

   This namespace specification is for a formal namespace.


2. IANA URN Specification Template


2.1 Namespace ID

       "iptc" requested.

2.2 Registration Information

       Registration Version Number: 1
       Registration Date: 2003-11-11

     Declared registrant of the namespace:

       Registering organization:
         International Press Telecommunications Council IPTC
         Royal Albert House
         Sheet Street
         Windsor, Berkshire SL4 1BE


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         www.iptc.org

       Designated contact person:
         Michael Steidl
         Managing Director
         mdirector@iptc.org


2.3 Declaration of syntactic structure

   All URNs assigned by IPTC will have a Namespace Specific String (NSS)
   of the following hierarchical structure:

   At the top of the hierarchy are three branches:
   - "std"
   - "std-draft"
   - "workdoc"


   The "std" branch hierarchy:

     The "std" branch URNs will be assigned to IPTC resources used for
     specifying and explaining any aspect of an IPTC standard.

     The NSS in the "std" branch will have this general structure:

     urn:iptc:std:{std-name}:{std-version}:{res-group}
         {:res-name}?{:res-version}?

     where
     "std-name" is a unique identifier for an IPTC standard.
     "std-version" reflects the version of this standard. The value
         'current' will be assigned to point at resources of the current
         version of a standard.
     "res-group": this field will take only three values:
        "spec" for all resources specifying a standard,
        "doc" for all resources used for additional documentation of
           and to support the use of a standard.
        "xmlns" for defining an XML namespace.
     "res-name" is an identifier for a tangible resource; the name
     should describe the content or the use of the resource. Since not
     all resources are tangible this value is optional.
     "res-version" reflects the version of this resource as long as it
     takes a physical format û like e.g. a file. Since not all resources
     are of a physical kind this value is optional.


   The "std-draft" branch hierarchy:



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     The "std-draft" branch URNs will be assigned to IPTC resources used
     for specifying and explaining any aspect of an IPTC standard while
     being in draft status, that is at a time when the resource is not
     formally approved by the IPTC Standards body.

     The NSS in the "std" branch will have this general structure:

     urn:iptc:std-draft:{std-name}:{std-version}:{res-group}
         {:res-name}?{:res-version}?

     The substructure of "urn:iptc:std-draft" is identical to that of
     "urn:iptc:std", find all explanations there.


   The "workdoc" branch hierarchy:

     The "workdoc" branch URNs will be assigned to IPTC resources not
     directly related to IPTC standards but to the work of IPTC.

     The NSS in the "doc" branch will have this general structure:

     urn:iptc:workdoc:{group-id}:{doc-id}:{doc-version}{:doc-descr}?


     where
     "group-id" is a unique identifier for working groups and working
     areas of IPTC and constitutes a document group.
     "doc-id" is a unique identifier for a document within a document
     group.
     "doc-version" reflects the version of this work document.
     "doc-descr" is an optional concise description of the document
     content.


2.4 Relevant ancillary documentation

   None


2.5 Identifier uniqueness considerations

   Identifier uniqueness will be enforced by the Managing Director of
   IPTC who will assign unique identifiers to all resources identified
   by a URN.


2.6 Identifier persistence considerations




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   IPTC is committed to maintaining the accessibility and persistence of
   all resources that are identified by an IPTC URN.


2.7 Process of identifier assignment

   Assignment is limited to the owner of this namespace and its
   authorities.


2.8 Process for identifier resolution

   IPTC will develop an appropriate mechanism that maps all assigned
   URNs to Uniform Resource Locators (URL), specifically to enable web
   based resolution of URNs.


2.9 Rules for Lexical Equivalence

   No special considerations, the rules for lexical equivalence
   of RFC 2141 apply.


2.10 Conformance with URN Syntax

   No special considerations.


2.11 Validation mechanism

   None specified. IPTC will develop a mechanism for resolving URNs to
   URLs (see 2.8), this mechanism will also show whether a URN is valid.


2.12 Scope

   Global.


3. Examples

   The following examples are representative for IPTC URNs, but may not
   refer to actual resources.

   urn:iptc:std:NewsML:1.1:spec:DTD:1
     DTD version 1 to specify the IPTC standard "NewsML", version 1.1

   urn:iptc:std-draft:NITF:3.5:spec:xml-schema:2
     Second draft XML Schema  for the IPTC standard "NITF", version 3.5


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   urn:iptc:std:SportsML:1.0:xmlns
     URN to identify an XML namespace for the IPTC standard "SportsML",
     version 1.0. No "res-name" and "res-version" since an XML namespace
     is of no physical format.

   urn:iptc:std:NewsML:1.1:doc:news-agency-guidelines:1.2
     Supporting document named "news-agency-guidelines", version 1,
     revision 2, based on the IPTC standard "NewsML" version 1.1.

   urn:iptc:workdoc:NMA:0315:1:srs-terms
     Work document of IPTC's News Metadata Working Party (NMA), version
     1, holding terms of the Subject Reference System


4. Namespace Considerations and Community Considerations

   The IPTC acknowledged already the use of URNs during the development
   of its XML based standard "NewsML". This standard implements the use
   of URNs as unique identifiers for news items as described in "URN
   Namespace for NewsML resources"[RFC3085].

   While developing additional XML based standards as siblings to
   NewsML, IPTC soon got aware that URNs have to be assigned to
   resources that fall beyond the scope of the NewsML namespace. For
   this reason IPTC developed a new and very general hierarchical
   namespace structure to cover the needs of the currently developed
   standards as well as future standards and to be able to assign URNs
   to resources emanating from them.

   In addition to resources relating directly to its standards, IPTC
   also produces and publishes other documents relevant to the news
   business. As those resources are used by many organizations outside
   the IPTC membership and therefore could not be considered as internal
   documents IPTC decided to add a branch to the URN hierarchy to be
   assigned to these resources.

   IPTC maintains global activities and its standards as well as
   resources based on them are used world wide. Since one focus of the
   activities of IPTC is on global exchange of news any system for
   unique identification of resources has to be considered under global
   aspects.

   For this reason IPTC considers the introduction of a URN namespace
   for its resources as proper action to maintain globally unique,
   persistent and location-independent identifiers based on open
   standards.




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5. Security Considerations

   There are no additional security considerations other than those
   normally associated with the use and resolution of URNs in general.


6. IANA Considerations

   This document includes a URN Namespace registration that conforms to
   the "Uniform Resources Names (URN) Namespace Definition Mechanism"
   [RFC3406] and is to be entered into the IANA registry for URN NIDs.


References

   [RFC2141] Moats, R., "URN Syntax", RFC 2141, May 1997.

   [RFC3406] Daigle, L. et al., "Uniform Resource Names (URN)
       Namespace Definition Mechanisms", RFC 3406, October 2002.

   [W3CXML] W3C, XML WG, "Extensible Markup Language (XML) 1.0",
       February 1998, <http://www.w3.org/TR/REC-xml>.

   [W3CXMLNS] W3C, Namespaces WG, "Namespaces in XML", January 1999,
       <http://www.w3.org/TR/REC-xml-names>.

   [RFC2483] Mealling, M. and R. Daniel, "URI Resolution Services
       Necessary for URN Resolution", RFC 2483, January 1999.

   [RFC3085] Coates, et al., "URN Namespace for NewsML resources",
       RFC 3085, March 2001.


AuthorÆs Addresses
   Michael Steidl
   IPTC (International Press Telecommunications Council)
   Royal Albert House
   Sheet Street
   Windsor SL4 1BE
   United Kingdom

   Phone: +44 (1753) 705 051
   Email: mdirector@iptc.org








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