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--------------------------------------------------------------------------------
2 Network Working Group P. Saint-Andre
3 Internet-Draft JSF
4 Expires: August 4, 2006 January 31, 2006
6 Transporting Presence Information Data Format (PIDF) over the Extensible
7 Messaging and Presence Protocol (XMPP)
8 draft-saintandre-xmpp-pidf-03
10 Status of this Memo
12 By submitting this Internet-Draft, each author represents that any
13 applicable patent or other IPR claims of which he or she is aware
14 have been or will be disclosed, and any of which he or she becomes
15 aware will be disclosed, in accordance with Section 6 of BCP 79.
17 Internet-Drafts are working documents of the Internet Engineering
18 Task Force (IETF), its areas, and its working groups. Note that
19 other groups may also distribute working documents as Internet-
20 Drafts.
22 Internet-Drafts are draft documents valid for a maximum of six months
23 and may be updated, replaced, or obsoleted by other documents at any
24 time. It is inappropriate to use Internet-Drafts as reference
25 material or to cite them other than as "work in progress."
27 The list of current Internet-Drafts can be accessed at
28 http://www.ietf.org/ietf/1id-abstracts.txt.
30 The list of Internet-Draft Shadow Directories can be accessed at
31 http://www.ietf.org/shadow.html.
33 This Internet-Draft will expire on August 4, 2006.
35 Copyright Notice
37 Copyright (C) The Internet Society (2006).
39 Abstract
41 This document defines how to send information encoded in the Presence
42 Information Data Format (PIDF) over the Extensible Messaging and
43 Presence Protocol (XMPP).
45 Table of Contents
47 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
48 2. Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
49 3. Security Considerations . . . . . . . . . . . . . . . . . . . 4
50 4. References . . . . . . . . . . . . . . . . . . . . . . . . . . 5
51 4.1 Normative References . . . . . . . . . . . . . . . . . . . 5
52 4.2 Informative References . . . . . . . . . . . . . . . . . . 5
53 Author's Address . . . . . . . . . . . . . . . . . . . . . . . 6
54 Intellectual Property and Copyright Statements . . . . . . . . 7
56 1. Introduction
58 1.1 Overview
60 The Presence Information Data Format ([PIDF]) defines a common data
61 format for presence protocols that conform to the Common Profile for
62 Presence ([CPP]), enabling presence information to be transferred
63 across CPP-compliant protocol boundaries without modification, with
64 attendant benefits for end-to-end encryption and performance.
65 Because the syntax for PIDF is Extensible Markup Language [XML], it
66 should be straightforward to send PIDF data over the Extensible
67 Messaging and Presence Protocol (XMPP) [XMPP-CORE], since XMPP is
68 simply an XML streaming protocol. This memo defines a mechanism for
69 encapsulating PIDF data within an "extended namespace" contained in
70 an XMPP presence stanza.
72 1.2 Terminology
74 This document inherits terminology defined in [PIDF], [XMPP-CORE],
75 and [XMPP-IM].
77 The capitalized key words "MUST", "MUST NOT", "REQUIRED", "SHALL",
78 "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and
79 "OPTIONAL" in this document are to be interpreted as described in RFC
80 2119 [TERMS].
82 2. Protocol
84 The PIDF format is defined in [PIDF]. Briefly, the XML namespace
85 name is 'urn:ietf:params:xml:ns:pidf', the root element is
86 , the element must possess an 'entity'
87 attribute that specifies the pres: URI (see [CPP]) that identifies
88 the presentity (see [RFC2778]) to which the PIDF data relates, and
89 the element may contain any number of child
90 elements specifying information about the entity.
92 The recommended method for encapsulating PIDF data within an XMPP
93 presence stanza is by including the PIDF element as a
94 child of the XMPP stanza. Although it may appear that
95 this is potentially confusing, the inclusion of the
96 'urn:ietf:params:xml:ns:pidf' namespace ensures that PIDF data is
97 kept separate from XMPP presence data (in accordance with [XML-
98 NAMES]). The following is a simple example of encapsulating PIDF
99 data within an "extended namespace" in XMPP:
101 A basic example of PIDF over XMPP:
103
104 dnd
105 Wooing Juliet
106
108
109
110 open
111
112
113
114
116 Because base PIDF data does not encapsulate any additional
117 information over and above XMPP presence stanzas, there is little
118 point to including it in native XMPP systems when it is not encrypted
119 (obviously, encrypting PIDF data can help to ensure end-to-end
120 encryption of presence information, as described in [XMPP-E2E],
121 especially across boundaries between CPP-compliant systems such as
122 those described in [XMPP-SIMPLE]). The power of PIDF in the context
123 of XMPP derives from PIDF extensions, such as those for rich presence
124 (see [RPID]) and geographical location (see [GEOLOC]). Any such
125 extension to PIDF can be included in an XMPP presence stanza, since,
126 according to the definition of "extended namespaces" in [XMPP-IM],
127 the format of such extended data is defined by the extension rather
128 than by the base XMPP specification itself. Thus the ability to
129 include PIDF data and PIDF data extensions in XMPP enables XMPP-aware
130 applications to include any PIDF-compatible data that is currently
131 defined or that may be defined in the future. Naturally, there is no
132 guarantee that all XMPP entities will be able to understand such PIDF
133 data, and entities that do not understand the data MUST ignore it (in
134 accordance with [XMPP-CORE]). However, this memo at least defines a
135 mechanism for including PIDF data, which XMPP applications are
136 encouraged to implement if they desire to make use of PIDF data
137 extensions for rich presence, geographical location, and other kinds
138 of presence-related information.
140 3. Security Considerations
142 This memo introduces no new security considerations above and beyond
143 those provided for PIDF in [PIDF] and for XMPP in [XMPP-CORE].
145 4. References
146 4.1 Normative References
148 [CPP] Peterson, J., "Common Profile for Presence (CPP)",
149 RFC 3859, August 2004.
151 [PIDF] Sugano, H., Fujimoto, S., Klyne, G., Bateman, A., Carr,
152 W., and J. Peterson, "Presence Information Data Format
153 (PIDF)", RFC 3863, August 2004.
155 [TERMS] Bradner, S., "Key words for use in RFCs to Indicate
156 Requirement Levels", BCP 14, RFC 2119, March 1997.
158 [XML] Bray, T., Paoli, J., Sperberg-McQueen, C., and E. Maler,
159 "Extensible Markup Language (XML) 1.0 (2nd ed)", W3C REC-
160 xml, October 2000, .
162 [XML-NAMES]
163 Bray, T., Hollander, D., and A. Layman, "Namespaces in
164 XML", W3C REC-xml-names, January 1999,
165 .
167 [XMPP-CORE]
168 Saint-Andre, P., "Extensible Messaging and Presence
169 Protocol (XMPP): Core", RFC 3920, October 2004.
171 [XMPP-E2E]
172 Saint-Andre, P., "End-to-End Signing and Object Encryption
173 for the Extensible Messaging and Presence Protocol
174 (XMPP)", RFC 3923, October 2004.
176 [XMPP-IM] Saint-Andre, P., "Extensible Messaging and Presence
177 Protocol (XMPP): Instant Messaging and Presence",
178 RFC 3921, October 2004.
180 4.2 Informative References
182 [GEOLOC] Peterson, J., "A Presence-based GEOPRIV Location Object
183 Format", RFC 4119, December 2005.
185 [RFC2778] Day, M., Rosenberg, J., and H. Sugano, "A Model for
186 Presence and Instant Messaging", RFC 2778, February 2000.
188 [RPID] Schulzrinne, H., "RPID: Rich Presence Extensions to the
189 Presence Information Data Format (PIDF)",
190 draft-ietf-simple-rpid-10 (work in progress),
191 December 2005.
193 [XMPP-SIMPLE]
194 Saint-Andre, P., "Basic Messaging and Presence
195 Interoperability between the Extensible Messaging and
196 Presence Protocol (XMPP) and Session Initiation Protocol
197 (SIP) for Instant Messaging and Presence Leveraging
198 Extensions (SIMPLE)", draft-saintandre-xmpp-simple-05
199 (work in progress), August 2005.
201 Author's Address
203 Peter Saint-Andre
204 Jabber Software Foundation
205 P.O. Box 1641
206 Denver, CO 80201
207 US
209 Email: stpeter@jabber.org
211 Intellectual Property Statement
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227 http://www.ietf.org/ipr.
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235 Disclaimer of Validity
237 This document and the information contained herein are provided on an
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245 Copyright Statement
247 Copyright (C) The Internet Society (2006). This document is subject
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251 Acknowledgment
253 Funding for the RFC Editor function is currently provided by the
254 Internet Society.