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Namespace for Presence Data Model

element that can contain free text. This element and other ones defined by extensions to PIDF that can contain free text SHOULD be labeled with the 'xml:lang' attribute to indicate their language and script. This specification allows multiple occurrences of the element so that the presentity can convey the note in multiple scripts and languages. If no 'xml:lang' attribute is provided, the default value is "i-default" [8]. Since the presence model is represented in XML, it provides native support for encoding information using the Unicode character set and its more compact representations including UTF-8. Conformant XML processors recognize both UTF-8 and UTF-16. Though XML includes provisions to identify and use other character encodings through use of an "encoding" attribute in an declaration, use of UTF-8 is Rosenberg Standards Track [Page 29] RFC 4479 Presence Data Model July 2006 RECOMMENDED in environments where parser encoding support incompatibility exists. 10. IANA Considerations There are several IANA considerations associated with this specification. 10.1. URN Sub-Namespace Registration This section registers a new XML namespace, per the guidelines in [4] URI: The URI for this namespace is urn:ietf:params:xml:ns:pidf:data-model. Registrant Contact: IETF, SIMPLE working group, (simple@ietf.org), Jonathan Rosenberg (jdrosen@jdrosen.net). XML: BEGIN A Data Model for Presence Namespace for Presence Data Model urn:ietf:params:xml:ns:pidf:data-model

See RFC4479.

END Rosenberg Standards Track [Page 30] RFC 4479 Presence Data Model July 2006 10.2. XML Schema Registrations This section registers two XML schemas per the procedures in [4]. 10.2.1. Common Schema URI: urn:ietf:params:xml:schema:pidf:common-schema. Registrant Contact: IETF, SIMPLE working group, (simple@ietf.org), Jonathan Rosenberg (jdrosen@jdrosen.net). The XML for this schema can be found as the sole content of Section 5.1.1. 10.2.2. Data Model URI: urn:ietf:params:xml:schema:pidf:data-model. Registrant Contact: IETF, SIMPLE working group, (simple@ietf.org), Jonathan Rosenberg (jdrosen@jdrosen.net). The XML for this schema can be found as the sole content of Section 5.1.2. 11. Acknowledgements This document is really a distillation of many ideas discussed over a long period of time. These ideas were contributed by many participants in the SIMPLE working group. Aki Niemi, Paul Kyzivat, Cullen Jennings, Ben Campbell, Robert Sparks, Dean Willis, Adam Roach, Hisham Khartabil, and Jon Peterson contributed many of the concepts that are described here. Example presence documents came from Robert Sparks' example presence documents specification, and ideas on defining services through characteristics, rather than enumeration, came from Adam Roach's service features document. A special thanks to Steve Donovan for discussions on the topics discussed here, and to Elwyn Davies for his final review of the document. Rosenberg Standards Track [Page 31] RFC 4479 Presence Data Model July 2006 12. References 12.1. Normative References [1] Sugano, H., Fujimoto, S., Klyne, G., Bateman, A., Carr, W., and J. Peterson, "Presence Information Data Format (PIDF)", RFC 3863, August 2004. [2] Rosenberg, J., Schulzrinne, H., and P. Kyzivat, "Caller Preferences for the Session Initiation Protocol (SIP)", RFC 3841, August 2004. [3] Crocker, D. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", RFC 4234, October 2005. [4] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, January 2004. [5] Yergeau, F., Paoli, J., Sperberg-McQueen, C., Bray, T., and E. Maler, "Extensible Markup Language (XML) 1.0 (Third Edition)", W3C REC REC-xml-20040204, February 2004. [6] Maloney, M., Beech, D., Thompson, H., and N. Mendelsohn, "XML Schema Part 1: Structures Second Edition", W3C REC REC- xmlschema-1-20041028, October 2004. [7] Malhotra, A. and P. Biron, "XML Schema Part 2: Datatypes Second Edition", W3C REC REC-xmlschema-2-20041028, October 2004. [8] Alvestrand, H., "IETF Policy on Character Sets and Languages", BCP 18, RFC 2277, January 1998. [9] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. 12.2. Informative References [10] Day, M., Rosenberg, J., and H. Sugano, "A Model for Presence and Instant Messaging", RFC 2778, February 2000. [11] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A., Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP: Session Initiation Protocol", RFC 3261, June 2002. [12] Peterson, J., "Common Profile for Presence (CPP)", RFC 3859, August 2004. Rosenberg Standards Track [Page 32] RFC 4479 Presence Data Model July 2006 [13] Saint-Andre, P., "Internationalized Resource Identifiers (IRIs) and Uniform Resource Identifiers (URIs) for the Extensible Messaging and Presence Protocol (XMPP)", Work in Progress, December 2005. [14] Wilde, E. and A. Vaha-Sipila, "URI Scheme for GSM Short Message Service", Work in Progress, February 2006. [15] Schulzrinne, H., "The tel URI for Telephone Numbers", RFC 3966, December 2004. [16] Klyne, G., "A Syntax for Describing Media Feature Sets", RFC 2533, March 1999. [17] Rosenberg, J., Schulzrinne, H., and P. Kyzivat, "Indicating User Agent Capabilities in the Session Initiation Protocol (SIP)", RFC 3840, August 2004. [18] Faltstrom, P. and M. Mealling, "The E.164 to Uniform Resource Identifiers (URI) Dynamic Delegation Discovery System (DDDS) Application (ENUM)", RFC 3761, April 2004. [19] Rosenberg, J., "The Session Initiation Protocol (SIP) and Spam", Work in Progress, March 2006. [20] Leach, P., Mealling, M., and R. Salz, "A Universally Unique IDentifier (UUID) URN Namespace", RFC 4122, July 2005. [21] Rosenberg, J., "A Presence Event Package for the Session Initiation Protocol (SIP)", RFC 3856, August 2004. [22] Rosenberg, J., "Obtaining and Using Globally Routable User Agent (UA) URIs (GRUU) in the Session Initiation Protocol (SIP)", Work in Progress, October 2005. [23] Schulzrinne, H., "RPID: Rich Presence Extensions to the Presence Information Data Format (PIDF)", RFC 4480, July 2006. [24] Lonnfors, M. and K. Kiss, "Session Initiation Protocol (SIP) User Agent Capability Extension to Presence Information Data Format (PIDF)", Work in Progress, January 2006. [25] Peterson, J., "A Presence-based GEOPRIV Location Object Format", RFC 4119, December 2005. [26] Rosenberg, J., "Presence Authorization Rules", Work in Progress, March 2006. Rosenberg Standards Track [Page 33] RFC 4479 Presence Data Model July 2006 [27] Jennings C. and R. Mahy, "Managing Client Initiated Connections in the Session Initiation Protocol (SIP)", Work in Progress, March 2006. Author's Address Jonathan Rosenberg Cisco Systems 600 Lanidex Plaza Parsippany, NJ 07054 US Phone: +1 973 952-5000 EMail: jdrosen@cisco.com URI: http://www.jdrosen.net Rosenberg Standards Track [Page 34] RFC 4479 Presence Data Model July 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. This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Intellectual Property The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Acknowledgement Funding for the RFC Editor function is provided by the IETF Administrative Support Activity (IASA). Rosenberg Standards Track [Page 35]

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