Network Working Group P. Saint-Andre Internet-Draft JSF Intended status: Informational November 7, 2006 Expires: May 11, 2007 A Uniform Resource Name (URN) Namespace for Extensions to the Extensible Messaging and Presence Protocol (XMPP) draft-saintandre-xmpp-urn-01 Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. 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 "work in progress." 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. This Internet-Draft will expire on May 11, 2007. Copyright Notice Copyright (C) The Internet Society (2006). Abstract This document describes a Uniform Resource Name (URN) namespace for uniquely identifying Extensible Markup Language (XML) formats and protocols that provide extensions to the Extensible Messaging and Presence Protocol (XMPP) and are defined in specifications published by the Jabber Software Foundation (JSF). Saint-Andre Expires May 11, 2007 [Page 1] Internet-Draft URN Namespace for XMPP Extensions November 2006 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Specification Template . . . . . . . . . . . . . . . . . . . . 3 3. Namespace Considerations . . . . . . . . . . . . . . . . . . . 6 4. Community Considerations . . . . . . . . . . . . . . . . . . . 6 5. Security Considerations . . . . . . . . . . . . . . . . . . . . 7 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7 7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7.1. Normative References . . . . . . . . . . . . . . . . . . . 7 7.2. Informative References . . . . . . . . . . . . . . . . . . 7 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 8 Intellectual Property and Copyright Statements . . . . . . . . . . 9 Saint-Andre Expires May 11, 2007 [Page 2] Internet-Draft URN Namespace for XMPP Extensions November 2006 1. Introduction While the Extensible Messaging and Presence Protocol (XMPP) as specified in [XMPP-CORE] and [XMPP-IM] provides basic messaging and presence funtionality, the fact that XMPP is at root a technology for streaming Extensible Markup Language [XML] data makes it possible to include virtually any structured information within XMPP, as long as such information is qualified by appropriate XML namespaces [XML-NAMES]. When sent over XMPP, such structured data formats and protocols are generally referred to as "XMPP extensions". A large number of such XMPP extensions exist. The main standards development organization in which such extensions are defined is the Jabber Software Foundation (JSF), which contributed XMPP to the Inernet Standards Process. Typically, such extensions are defined within the JSF's XMPP Extension Protocol (XEP) specification series. To date, the XML namespaces defined within the Jabber/XMPP community have used names of the form "jabber:*" (deprecated since early 2002) and "http://jabber.org/protocol/*" (not including names of the form "urn:ietf:params:xml:ns:xmpp-*" specified in the XMPP RFCs). However, it is desirable that names associated with future XMPP extensions be both unique and persistent, which is not necessarily the case with names that are also HTTP URLs. Therefore, in accordance with the process defined in [MECHANISMS], this document registers a formal namespace identifier (NID) for Uniform Resource Names [URN] associated with XMPP extensions published in the JSF's XEP series and XML namespaces registered with the JSF's XMPP Registrar function [REGISTRAR]. 2. Specification Template Namespace ID: The Namespace ID "xmpp" is requested. Registration Information: Version 1 Date: Declared Registrant of the Namespace: Registering organization Organization: Jabber Software Foundation Address: P.O. Box 1641, Denver, CO 80201 USA Designated contact Saint-Andre Expires May 11, 2007 [Page 3] Internet-Draft URN Namespace for XMPP Extensions November 2006 Role: XMPP Registrar Email: registrar@jabber.org Declaration of Syntactic Structure: The Namespace Specific String (NSS) of all URNs that use the "xmpp" NID shall have the following structure: urn:xmpp:{ShortName}:{SubName} The keywords have the following meaning: (1) the "ShortName" is a US-ASCII string that conforms to the URN syntax requirements (see RFC 2141) and defines a particular protocol or format that is used as an XMPP extension (2) the "SubName" is a US-ASCII string that conforms to the URN syntax requirements (see RFC 2141) and defines a particular subset of the relevant protocol or format. The JSF's XMPP Registrar function shall be responsible for managing the assignment of both "ShortName" and "SubName" strings and maintaining a registry of resulting namespaces at . The XMPP Registrar may also assign URNs in sub-trees below the level of the ShortName or SubName as needed for use in various XMPP extensions. Relevant Ancillary Documentation: Information about the JSF's XMPP Registrar function can be found at and . Identifier Uniqueness Considerations: The XMPP Registrar is already responsible for managing the assignment of XML namespace names of the form "http://jabber.org/protocol/{ShortName}" and "http://jabber.org/protocol/{ShortName}#{SubName}" (e.g., "http://jabber.org/protocol/pubsub" and "http://jabber.org/protocol/disco#info"). If the "xmpp" NID is approved, the XMPP Registrar shall simply modify the syntax of the namespace names it assigns from "http://jabber.org/protocol/{ShortName}" and "http://jabber.org/protocol/{ShortName}#{SubName}" to "urn:xmpp:{ShortName}" and "urn:xmpp:{ShortName}:{SubName}". Saint-Andre Expires May 11, 2007 [Page 4] Internet-Draft URN Namespace for XMPP Extensions November 2006 The XMPP Registrar shall ensure the uniqueness of all ShortName strings and of all SubName strings within the context of a given ShortName through checking such names against the list of existing namespace names (this process is not currently documented, but documentation may be added to XEP-0053, which is the controlling specification for the XMPP Registrar). It is envisioned that the XMPP Registrar shall in all cases directly ensure the uniqueness of the assigned strings and that the XMPP Registrar shall not assign secondary responsibility for management of any sub-trees. However, the XMPP Registrar may assign URNs in sub-trees below the level of the ShortName or SubName as needed for use in various XMPP extensions. The resulting URNs shall not be re-assigned. Identifier Persistence Considerations: The XMPP Registrar shall provide clear documentation of the registered uses of the "xmpp" NID in the form of XMPP Extension Protocol (XEP) specifications published at as well as a registry of the registered namespaces themselves at . Process of Identifier Assignment: The XMPP Registrar's processes for ShortName and SubName assignment are not currently documented, but such strings are typically generated by the author of the relevant XMPP Extension Protocol specification and checked by the XMPP Registrar against the list of existing namespace names to ensure relevance, memorability, and uniqueness (documentation of this process may be added to XEP-0053, which is the controlling specification for the XMPP Registrar). Assignment of URNs within the "xmpp" tree is reserved to the Jabber Software Foundation, specifically to its XMPP Registrar function as specified in XEP-0053. Process for Identifier Resolution: The namespace is not currently listed with a Resolution Discovery System (RDS), but nothing about the namespace prohibits the future definition of appropriate resolution methods or listing with an RDS. Rules for Lexical Equivalence: Saint-Andre Expires May 11, 2007 [Page 5] Internet-Draft URN Namespace for XMPP Extensions November 2006 No special considerations; the rules for lexical equivalence specified in RFC 2141 apply. Conformance with URN Syntax: No special considerations. Validation Mechanism: None specified. Scope: Global. 3. Namespace Considerations The standards work of the Jabber Software Foundation has been in progress since August 2001 and is expected to continue for the foreseeable future. The old-style "jabber:*" namespace names originally used in the Jabber open-source community were not proper URNs or URIs and thus were deprecated in early 2002. Since then, the namespace names assigned by the XMPP Registrar function of the Jabber Software Foundation have been (equivalent to) specialized HTTP URLs whose authority component is "jabber.org". While that domain is currently under the control of the Jabber Software Foundation, there is no guarantee that it will always remain so, thus potentially threatening the reliability and permanence of the assigned namespace names. The use of Uniform Resource Names with an appropriate Namespace ID will enable the Jabber Software Foundation to assign cleaner, more general, more permanent, more reliable, and more controllable namespace names related to the XMPP extensions it defines, while keeping the tree of XMPP extensions properly separate from the IETF tree used to define some of the core XMPP namespaces. 4. Community Considerations The Jabber/XMPP standards development community will benefit from publication of this namespace by having more permanent and reliable names for the XML namespaces defined in XMPP Extension Protocol specifications produced by the JSF. The standards process followed by the JSF is open to contributions from any interested individual; such a contribution takes the form of a proposal submitted to the XMPP Extensions Editor , accepted by the XMPP Council Saint-Andre Expires May 11, 2007 [Page 6] Internet-Draft URN Namespace for XMPP Extensions November 2006 , and published in the JSF's XMPP Extension Protocol (XEP) series at . It is envisioned that, as at present, use of the proposed space for a particular XML format or protocol extension will be contingent upon advancement of the appropriate specification within the JSF's standards process as documented in XEP-0001 . 5. Security Considerations This document introduces no additional security considerations other than those associated with the use and resolution of URNs in general. 6. IANA Considerations This document defines a URN NID registration of "xmpp", which shall be entered into the IANA registry located at . 7. References 7.1. Normative References [MECHANISMS] Daigle, L., van Gulik, D., Iannella, R., and P. Faltstrom, "Uniform Resource Names (URN) Namespace Definition Mechanisms", BCP 66, RFC 3406, October 2002. [URN] Moats, R., "URN Syntax", RFC 2141, May 1997. 7.2. Informative References [REGISTRAR] Saint-Andre, P., "XMPP Registrar", JSF XEP 0053, May 2004. [XML] Bray, T., Paoli, J., Sperberg-McQueen, C., and E. Maler, "Extensible Markup Language (XML) 1.0 (2nd ed)", W3C REC- xml, October 2000, . [XML-NAMES] Bray, T., Hollander, D., and A. Layman, "Namespaces in XML", W3C REC-xml-names, January 1999, . [XMPP-CORE] Saint-Andre Expires May 11, 2007 [Page 7] Internet-Draft URN Namespace for XMPP Extensions November 2006 Saint-Andre, P., "Extensible Messaging and Presence Protocol (XMPP): Core", RFC 3920, October 2004. [XMPP-IM] Saint-Andre, P., "Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and Presence", RFC 3921, October 2004. Author's Address Peter Saint-Andre Jabber Software Foundation P.O. Box 1641 Denver, CO 80201 US Email: stpeter@jabber.org URI: xmpp:stpeter@jabber.org Saint-Andre Expires May 11, 2007 [Page 8] Internet-Draft URN Namespace for XMPP Extensions November 2006 Full Copyright Statement Copyright (C) The Internet Society (2006). 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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