This is a purely informative rendering of an RFC that includes verified errata. This rendering may not be used as a reference.

The following 'Verified' errata have been incorporated in this document: EID 1516
Network Working Group                                          A. Monrad
Request for Comments: 5279                                     S. Loreto
Category: Informational                                         Ericsson
                                                               July 2008

                A Uniform Resource Name (URN) Namespace
           for the 3rd Generation Partnership Project (3GPP)

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.


   This document describes the Namespace Identifier (NID) for Uniform
   Resource Namespace (URN) resources published by the 3rd Generation
   Partnership Project (3GPP). 3GPP defines and manages resources that
   utilize this URN name model.  Management activities for these and
   other resource types are provided by the 3GPP Support Team.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 2
   2.  URN Specification for the 3GPP Namespace Identifier (NID) . . . 2
   3.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
   4.  Namespace Considerations  . . . . . . . . . . . . . . . . . . . 5
   5.  Community Considerations  . . . . . . . . . . . . . . . . . . . 5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   8.  Normative References  . . . . . . . . . . . . . . . . . . . . . 6

1.  Introduction

   3GPP is a cooperation of international telecommunication standards
   bodies developing technologies for cellular networks.  This activity
   is supported by a membership composed of network operators, equipment
   vendors, content providers, and other suppliers to the mobile market.

   Some of the technologies being developed by 3GPP need URN namespaces
   that are managed so that they are unique and persistent.  To assure
   that the uniqueness is absolute, the registration of a specific NID
   for use by 3GPP was deemed appropriate.  Therefore, a full and
   complete registration will follow the namespace specification process
   as defined in RFC 3406 [RFC3406].

2.  URN Specification for the 3GPP Namespace Identifier (NID)

   Namespace ID:


   Registration Information:

         registration version number: 1
         registration date:           2007-11-16

   Declared registrant of the namespace:

         Registering organization
            Name:    3rd Generation Partnership Project
            Address: ETSI
                     Mobile Competence Centre
                     650, route des Luciole
                     06921 Sophia-Antipolis Cedex

         Designated contact
            Role:    Specifications Manager

      Declaration of syntactic structure: 

     All URNs that use the "3gpp" NID will have the following


      where the "3gpp-urn" is a US-ASCII string that conforms to the
      NSS(Namespace Specific String) Syntax described in RFC 2141
     [RFC2141] and defines a specific resource.
EID 1516 (Verified) is as follows:

Section: 2, pg.2/3

Original Text:

   Declaration of syntactic structure:

|     The Namespace Specific String (NSS) of all URNs that use the
|     "3gpp" NID will have the following structure:


      where the "3gpp-urn" is a US-ASCII string that conforms to the
      NSS(Namespace Specific String) Syntax described in RFC 2141
|     [RFC2141] and defines a specific resource type.

Corrected Text:

   Declaration of syntactic structure:

|     All URNs that use the "3gpp" NID will have the following
|     structure:


      where the "3gpp-urn" is a US-ASCII string that conforms to the
      NSS(Namespace Specific String) Syntax described in RFC 2141
|     [RFC2141] and defines a specific resource.
a) Obviously, the original clause contradicts itself.

It is impossible that the NSS is a proper subpart of itself
as would be required by the text and the syntax shown.

The corrected text resolves this partial issue, but not the
next two issues, which still remain open. Furthermore, for
logical consistency, "resource type" had to be replaced by
"resource" in the last line, to maintain the required
uniqueness property of '3gpp' URNs.

b) Even the corrected statement merely is a simple instantiation of
the general definition in RFC 2141 (Section 2, page 1), plus
giving an alias name (<3gpp-urn>) to the NSSs of '3gpp' URNs.

However, it does not cure the apparent underspecification:

The current URN Namespace registration template per BCP 66,
RFC3406, serves for "... providing a mechanism for disclosing
[the] structure of the URN namespace ..." (page 11 of RFC 3406),
but the quoted clause, as it stands, does *not*
"outline any structural features of identifiers in this namespace"
(p. 12 of RFC 3406).
Relevant ancillary documentation: 3GPP provides information on registration for each URN. More information about 3GPP and the registration activities and procedures to be followed are available at: Identifier uniqueness considerations: 3GPP will manage resources using the "3gpp" NID and will be the authority for managing the "3gpp-urn" strings. In the associated procedures, 3GPP will ensure the uniqueness of the strings themselves or shall permit secondary responsibility for management of well-defined sub-trees. 3GPP may permit use of experimental type values that will not be registered. As a consequence, multiple users may end up using the same value for separate uses. Unregistered type values will only be allowed in sub-namespaces clearly marked as experimental, to help implementors avoid "leaking" experimental values into real use. Identifier persistence considerations: 3GPP will provide clear documentation of the registered uses of the "3gpp" NID. This will be structured such that each "3gpp- urn", if needed, will have a separate description and registration table. The registration tables and information will be published and maintained by 3GPP on its web site. Process of identifier assignment: 3GPP will provide procedures for registration of each type of resource that it maintains. Each such resource may have three types of registration activities: 1. Registered values associated with 3GPP specifications or services 2. Registration of values or sub-trees to other entities 3. Name models for use in experimental purposes New Namespace Identifier (NID) labels The Entries in the registration table will be the following: 3gpp-urn: the registered value; Description: description of the registered value; Reference: 3GPP spec that defines the value; Contact: person requesting the URN assignment. Process for identifier resolution: The namespace is not listed with a Resolution Discovery System (RDS), as this is not relevant. Rules for Lexical Equivalence: No special considerations; the rules for lexical equivalence of RFC 2141 [RFC2141] apply. Conformance with URN Syntax: No special considerations. Validation mechanism: None specified. URN assignment will be handled by procedures supported and maintained by 3GPP. Scope: Global 3. Examples The following examples are representative URNs that could be assigned by 3GPP. They are not actual strings that are assigned. urn:3gpp:featurephones Defines the "3gpp-urn" to be used for "featurephones". Defines the URN associated with the operator identified by the "3gpp-urn" value "acme", which has decided to register and provide information about its service identified by value "foo-serv". 4. Namespace Considerations The 3rd Generation Partnership Project is developing a variety of enablers and applications. Some of these require information to be fully specified. For proper operation, descriptions of the needed information must exist for the URNs and be available in a unique, reliable, and persistent manner. As 3GPP is ongoing and covers many technical areas, the possibility of binding to various other namespace repositories has been deemed impractical. Each object or description, as defined in 3GPP, could possibly be related to multiple different other namespaces, so further conflicts of association could occur. Thus, the intent is to utilize the 3GPP specifications manager as the naming authority for 3GPP-defined URNs and its descriptions. 5. Community Considerations The objects and descriptions required for enablers produced by 3GPP are generally available for use by other organizations. The 3rd Generation Partnership Project Support Office will provide access and support for name requests by these organizations. This support can be enabled in a timely and responsive fashion as new objects and descriptions are produced. 6. Security Considerations There are no security considerations other than those normally associated with the use and resolution of URNs in general. 7. IANA Considerations This section registers a new URN NID with the registration provided in Section 2. "3gpp-urn" strings are identified by label managed by 3GPP. Thus, creating a new label does not require any IANA action. 8. Normative References [RFC3406] Daigle, L., van Gulik, D., Iannella, R., and P. Faltstrom, "Uniform Resource Names (URN) Namespace Definition Mechanisms", BCP 66, RFC 3406, October 2002. [RFC2141] Moats, R., "URN Syntax", RFC 2141, May 1997. Authors' Addresses Atle Monrad Ericsson Televeien 1 Grimstad 4898 Norway EMail: Salvatore Loreto Ericsson Hirsalantie 11 Jorvas 02420 Finland EMail: Full Copyright Statement Copyright (C) The IETF Trust (2008). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. 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