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2	XCON                                                             O. Novo
3	Internet-Draft                                              G. Camarillo
4	Intended status: Standards Track                                Ericsson
5	Expires: May 1, 2009                                           D. Morgan
6	                                                    Fidelity Investments
7	                                                                 R. Even
8	                                                                 Polycom
9	                                                           J. Urpalainen
10	                                                                   Nokia
11	                                                        October 28, 2008

13	 Conference Information Data Model for Centralized Conferencing (XCON)
14	                draft-ietf-xcon-common-data-model-12.txt

16	Status of this Memo

18	   By submitting this Internet-Draft, each author represents that any
19	   applicable patent or other IPR claims of which he or she is aware
20	   have been or will be disclosed, and any of which he or she becomes
21	   aware will be disclosed, in accordance with Section 6 of BCP 79.

23	   Internet-Drafts are working documents of the Internet Engineering
24	   Task Force (IETF), its areas, and its working groups.  Note that
25	   other groups may also distribute working documents as Internet-
26	   Drafts.

28	   Internet-Drafts are draft documents valid for a maximum of six months
29	   and may be updated, replaced, or obsoleted by other documents at any
30	   time.  It is inappropriate to use Internet-Drafts as reference
31	   material or to cite them other than as "work in progress."

33	   The list of current Internet-Drafts can be accessed at
34	   http://www.ietf.org/ietf/1id-abstracts.txt.

36	   The list of Internet-Draft Shadow Directories can be accessed at
37	   http://www.ietf.org/shadow.html.

39	   This Internet-Draft will expire on May 1, 2009.

41	Abstract

43	   This document defines an Extensible Markup Language (XML)-based
44	   conference information data model for centralized conferencing
45	   (XCON).  A conference information data model is designed to convey
46	   information about the conference and about participation in the
47	   conference.  The conference information data model defined in this
48	   document constitutes an extension of the data format specified in the
49	   Session Initiation Protocol (SIP) Event Package for Conference State.

51	Table of Contents

53	   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
54	   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  6
55	   3.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
56	     3.1.  Data Model Format  . . . . . . . . . . . . . . . . . . . .  6
57	     3.2.  Data Model Namespace . . . . . . . . . . . . . . . . . . .  6
58	     3.3.  The Conference Object Identifier . . . . . . . . . . . . .  7
59	       3.3.1.  Conference Object URI Definition . . . . . . . . . . .  9
60	     3.4.  Data Model Structure . . . . . . . . . . . . . . . . . . .  9
61	   4.  Data Model Definition  . . . . . . . . . . . . . . . . . . . . 10
62	     4.1.  <conference-info>  . . . . . . . . . . . . . . . . . . . . 13
63	     4.2.  <conference-description> . . . . . . . . . . . . . . . . . 14
64	       4.2.1.  <language> . . . . . . . . . . . . . . . . . . . . . . 14
65	       4.2.2.  <display-text> . . . . . . . . . . . . . . . . . . . . 14
66	       4.2.3.  <subject>  . . . . . . . . . . . . . . . . . . . . . . 14
67	       4.2.4.  <free-text>  . . . . . . . . . . . . . . . . . . . . . 14
68	       4.2.5.  <keywords> . . . . . . . . . . . . . . . . . . . . . . 15
69	       4.2.6.  <allow-sidebars> . . . . . . . . . . . . . . . . . . . 15
70	       4.2.7.  <conference-time>  . . . . . . . . . . . . . . . . . . 15
71	       4.2.8.  <conf-uris>  . . . . . . . . . . . . . . . . . . . . . 16
72	       4.2.9.  <service-uris> . . . . . . . . . . . . . . . . . . . . 16
73	       4.2.10. <maximum-user-count> . . . . . . . . . . . . . . . . . 16
74	       4.2.11. <available-media>  . . . . . . . . . . . . . . . . . . 17
75	     4.3.  <host-info>  . . . . . . . . . . . . . . . . . . . . . . . 19
76	     4.4.  <conference-state> . . . . . . . . . . . . . . . . . . . . 19
77	       4.4.1.  <allow-conference-event-subscription>  . . . . . . . . 19
78	       4.4.2.  <user-count> . . . . . . . . . . . . . . . . . . . . . 19
79	       4.4.3.  <active> . . . . . . . . . . . . . . . . . . . . . . . 19
80	       4.4.4.  <locked> . . . . . . . . . . . . . . . . . . . . . . . 20
81	     4.5.  <floor-information>  . . . . . . . . . . . . . . . . . . . 20
82	       4.5.1.  <conference-ID>  . . . . . . . . . . . . . . . . . . . 20
83	       4.5.2.  <allow-floor-events> . . . . . . . . . . . . . . . . . 20
84	       4.5.3.  <floor-request-handling> . . . . . . . . . . . . . . . 20
85	       4.5.4.  <conference-floor-policy>  . . . . . . . . . . . . . . 21
86	     4.6.  <users>  . . . . . . . . . . . . . . . . . . . . . . . . . 22
87	       4.6.1.  <join-handling>  . . . . . . . . . . . . . . . . . . . 22
88	       4.6.2.  <user-admission-policy>  . . . . . . . . . . . . . . . 22
89	       4.6.3.  <allowed-users-list> . . . . . . . . . . . . . . . . . 23
90	       4.6.4.  <deny-users-list>  . . . . . . . . . . . . . . . . . . 24
91	       4.6.5.  <user> and Its <user> Sub-elements . . . . . . . . . . 24
92	         4.6.5.1.  <display-text> . . . . . . . . . . . . . . . . . . 25
93	         4.6.5.2.  <associated-aors>  . . . . . . . . . . . . . . . . 25
94	         4.6.5.3.  <provide-anonymity>  . . . . . . . . . . . . . . . 25
95	         4.6.5.4.  <roles>  . . . . . . . . . . . . . . . . . . . . . 26
96	         4.6.5.5.  <languages>  . . . . . . . . . . . . . . . . . . . 26
97	         4.6.5.6.  <cascaded-focus> . . . . . . . . . . . . . . . . . 26
98	         4.6.5.7.  <allow-refer-users-dynamically>  . . . . . . . . . 26
99	         4.6.5.8.  <allow-invite-users-dynamically> . . . . . . . . . 26
100	         4.6.5.9.  <allow-remove-users-dynamically> . . . . . . . . . 27
101	         4.6.5.10. <endpoint> . . . . . . . . . . . . . . . . . . . . 27
102	     4.7.  <sidebars-by-ref>  . . . . . . . . . . . . . . . . . . . . 28
103	     4.8.  <sidebars-by-val>  . . . . . . . . . . . . . . . . . . . . 28
104	   5.  RELAX NG Schema  . . . . . . . . . . . . . . . . . . . . . . . 28
105	   6.  XML Schema Extensibility . . . . . . . . . . . . . . . . . . . 39
106	   7.  XML Example  . . . . . . . . . . . . . . . . . . . . . . . . . 39
107	   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 49
108	     8.1.  Authentication . . . . . . . . . . . . . . . . . . . . . . 49
109	     8.2.  Confidentiality  . . . . . . . . . . . . . . . . . . . . . 49
110	     8.3.  Integrity  . . . . . . . . . . . . . . . . . . . . . . . . 50
111	   9.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 50
112	     9.1.  Relax NG Schema Registration . . . . . . . . . . . . . . . 50
113	     9.2.  XML Namespace Registration . . . . . . . . . . . . . . . . 50
114	     9.3.  Conference Object Identifier Registration  . . . . . . . . 51
115	     9.4.  Conference User Identifier Registration  . . . . . . . . . 52
116	   10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 52
117	   11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 53
118	     11.1. Normative References . . . . . . . . . . . . . . . . . . . 53
119	     11.2. Informative References . . . . . . . . . . . . . . . . . . 53
120	   Appendix A.  Non-Normative RELAX NG Schema in XML Syntax . . . . . 54
121	   Appendix B.  Non-Normative W3C XML Schema  . . . . . . . . . . . . 81
122	   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 90
123	   Intellectual Property and Copyright Statements . . . . . . . . . . 92

125	1.  Introduction

127	   There is a core data set of conference information that is utilized
128	   in any conference, independent of the specific conference media.
129	   This core data set called the 'conference information data model' is
130	   defined in this document using an Extensible Markup Language (XML)-
131	   based.  The conference information data model defined in this
132	   document is logically represented by the conference object.

134	   Conference objects are a fundamental concept in Centralized
135	   Conferencing, as described in the Centralized Conferencing Framework
136	   [RFC5239].  A conference object contains data that represents a
137	   conference during each of its various stages (e.g., created/creation,
138	   reserved/reservation, active/activation, completed/completion).  A
139	   conference object can be manipulated using a conference control
140	   protocol at a conference server.  The conference object represents a
141	   particular instantiation of a conference information data model.
142	   Consequently, conference objects follow the XML format defined in
143	   this document.

145	   A conference object contains the core information of a conference
146	   (i.e., capabilities, membership, call control signaling, media, etc.)
147	   and specifies who, and in which way that information can be
148	   manipulated.

150	   Figure 1 shows the logical functional elements of a conference server
151	   as defined by the Centralized Conferencing Framework [RFC5239].  They
152	   are a Conference Control Server, a Floor Control Server, a number of
153	   Foci, and a Notification Service.  A conference control protocol
154	   provides the interface between a conference control client and the
155	   conference control server.  A floor control protocol (e.g., BFCP
156	   [RFC4582]) provides the interface between a floor control client and
157	   the floor control server.  A call signaling protocol (e.g., SIP,
158	   H.323, Q.931, ISUP, etc.) provides the interface between a call
159	   signaling client and a Focus.  A notification protocol (e.g., SIP-
160	   based event notifications [RFC3265]) provides the interface between
161	   the conferencing client and the Notification Service.  Within a
162	   conference, the conference control server, floor control server, and
163	   focus can modify the information in the conference object.

165	      ...............................................................
166	      . Conferencing Server                                         .
167	      .       +---------------------------------------------------+ .
168	      .       |       C o n f e r e n c e   o b j e c t           | .
169	      .     +-+--------------------------------------------------+| .
170	      .     |       C o n f e r e n c e   o b j e c t            || .
171	      .   +-+---------------------------------------------------+|| .
172	      .   |       C o n f e r e n c e   o b j e c t             ||| .
173	      .   | +--------------------------------------------------+||| .
174	      .   | | Conference Information Data Model                |||| .
175	      .   | | +----------------------------------------------+ |||| .
176	      .   | | | Conference description  (times, duration)    | |||| .
177	      .   | | +----------------------------------------------+ |||| .
178	      .   | | +----------------------------------------------+ |||| .
179	      .   | | | Host information                             | |||| .
180	      .   | | +----------------------------------------------+ |||| .
181	      .   | | +----------------------------------------------+ |||| .
182	      .   | | | Conference state                             | |||| .
183	      .   | | +----------------------------------------------+ |||| .
184	      .   | | +----------------------------------------------+ |||| .
185	      .   | | | Floor information                            | |||| .
186	      .   | | +----------------------------------------------+ |||| .
187	      .   | | +----------------------------------------------+ |||| .
188	      .   | | | Membership (users, capacity)                 | |||| .
189	      .   | | +----------------------------------------------+ |||| .
190	      .   | | +----------------------------------------------+ |||| .
191	      .   | | | Sidebars, Etc.                               | |||| .
192	      .   | | +----------------------------------------------+ |||| .
193	      .   | | +----------------------------------------------+ |||| .
194	      .   | | | Etc.                                         | |||| .
195	      .   | | +----------------------------------------------+ |||+ .
196	      .   | +--------------------------------------------------+|+  .
197	      .   +----^------------------^-------------^--------|------+   .
198	      .        |                  |             |        |          .
199	      . +------v-------+ +--------v-----+ +-----v-+ +----v-------+  .
200	      . | Conference   | | Floor        | |       | |            |  .
201	      . | Control      | | Control      | |Foci   | |Notification|  .
202	      . | Server       | | Server       | |       | |Service     |  .
203	      . +-----^--------+ +---^----------+ +-^-----+ +------------+  .
204	      ........|..............|..............|..........|.............
205	              |Conference    |Floor         |Call      |Notification
206	              |Control       |Control       |Signaling |Protocol
207	              |Protocol      |Protocol      |Protocol  |
208	      ........v..............v..............v..........v.............
209	      .     C  o  n  f  e  r  e  n  c  i  n  g     C  l i  e  n  t  .
210	      ...............................................................

212	                 Figure 1: Conference Server Architecture

214	   The Session Initiation Protocol (SIP) Event Package for Conference
215	   State, specified in [RFC4575], already defines a data format for
216	   conferences.  However, that model is SIP specific and lacks elements
217	   related to some of the functionality defined by the Centralized
218	   Conferencing Framework [RFC5239] (e.g., floor control).  The data
219	   model defined in this document constitutes a superset of the data
220	   format defined in [RFC4575].  The result is a data format that
221	   supports more call signaling protocols besides SIP and that covers
222	   all the functionality defined in the Centralized Conferencing
223	   Framework [RFC5239].

225	2.  Terminology

227	   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
228	   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
229	   document are to be interpreted as described in RFC 2119 [RFC2119].

231	   This document uses the terminology defined in the Centralized
232	   Conferencing Framework [RFC5239], the SIPPING conferencing framework
233	   [RFC4353] and the BFCP (Binary Floor Control Protocol) specification
234	   [RFC4582].  Readers of this document should be familiar with the
235	   terminology used in those documents.

237	3.  Overview

239	   The data model specified in this document is the result of extending
240	   the data format defined in [RFC4575] with new elements.  Examples of
241	   such extensions include scheduling elements, media control elements,
242	   floor control elements, non-SIP URIs, and addition of localization
243	   extensions to text elements.  This data model can be used by
244	   conference servers providing different types of basic conferences.
245	   It is expected that this data model can be further extended with new
246	   elements in the future in order to implement additional advanced
247	   features.

249	3.1.  Data Model Format

251	   A conference object document is an XML [W3C.REC-xml-20001006]
252	   document that MUST be well formed and SHOULD be valid.  Conference
253	   object documents MUST be based on XML 1.0 and SHOULD be encoded using
254	   UTF-8.

256	3.2.  Data Model Namespace

258	   This specification defines a new namespace specification for
259	   identifying the elements defined in the data model.  This namespace
260	   is as follows:

262	   urn:ietf:params:xml:ns:xcon-conference-info

264	3.3.  The Conference Object Identifier

266	   The conference object identifier (XCON-URI) can be viewed as a key to
267	   accessing a specific conference object.  It can be used, for
268	   instance, by the conference control protocol to access, manipulate
269	   and delete a conference object.  A conference object identifier is
270	   provided to the conferencing client by the conference notification
271	   service or through out-of-band mechanisms (e.g.  E-Mail).

273	   A conferencing system may maintain a relationship between the
274	   conference object identifiers and the identifiers associated with
275	   each of the complementary centralized conferencing protocols (e.g.,
276	   call signaling protocols, BFCP, etc.).  To facilitate the maintenance
277	   of these relationships, the conference object identifier acts as a
278	   top level identifier within the conferencing system for the purpose
279	   of identifying the interfaces for these other protocols.  This
280	   implicit binding provides a structured mapping of the various
281	   protocols with the associated conference object Identifier.  Figure 2
282	   illustrates the relationship between the identifiers used for the
283	   protocols and the general conference object identifier (XCON-URI).

285	                            +--------------------------+
286	                            |       Conference         |
287	                            |         Object           |
288	                            |       Identifier         |
289	                            +--------------------------+
290	                            |  xcon:Ji092i@example.com |
291	                            +------+-------------------+
292	                                        |
293	                                        |
294	                                        |
295	                      +-----------------+---------------+
296	                      |                                 |
297	          +-----------+-----------+          +----------+---------+
298	          |   CSP Conference IDs  |          |BFCP 'Conference ID'|
299	          +-----------------------+          +--------------------+
300	          | h323:i092@example.com |          |        i092        |
301	          | tel:+44(0)2920930033  |          +----------+---------+
302	          | sip:i092@example.com  |                     |
303	          +-----------------------+             +-------+--------+
304	                                                | BFCP 'Floor ID'|
305	                                                +----------------+
306	                                                |      543       |
307	                                                |      236       |
308	                                                +----------------+

310	                    Figure 2: Conference Object Mapping

312	   In Figure 2, the conference object identifier acts as the top level
313	   key in the identification process.  The call signaling protocols have
314	   an associated conference user identifier, often represented in the
315	   form of URIs.  The binary floor control protocol, as defined in
316	   [RFC4582], defines the 'conference ID' identifier which represents a
317	   conference instance within floor control.  When created within the
318	   conferencing system, the 'conference ID' has a 1:1 mapping to the
319	   unique conference object Identifier(XCON-URI).  Operations associated
320	   with the conference control protocols are directly associated with
321	   the conference object, thus the primary identifier associated with
322	   these protocols is the conference object identifier(XCON-URI).  The
323	   mappings between additional protocols/interface is not strictly 1:1
324	   and does allow for multiple occurrences.  For example, multiple call
325	   signaling protocols will each have a representation that is
326	   implicitly linked to the top level conference object identifier e.g.
327	   H323 and SIP URIs that represent a conference instance.  It should be
328	   noted that a conferencing system is free to structure such
329	   relationships as required and this information is just included as a
330	   guideline that can be used.

332	   Further elements can be added to the tree representation in Figure 2
333	   to enable a complete representation of a conference instance within a
334	   conferencing system.

336	3.3.1.  Conference Object URI Definition

338	   XCON-URI = "xcon" ":" [conf-object-id "@"] host [ ":" port ]

340	    conf-object-id = 1*( unreserved / "+" / "=" / "/" )

342	   host, port, and unreserved are defined in RFC3986[RFC3986]

344	3.4.  Data Model Structure

346	   The information in this data model is structured in the following
347	   manner.  All the information related to a conference is contained in
348	   a <conference-info> element.  The <conference-info> element contains
349	   the following child elements:

351	   o  The <conference-description> element describes the conference as a
352	      whole.  It has, for instance, information about the URI of the
353	      conference, maximum users allowed in the conference, media
354	      available in the conference, or the time the conference will
355	      start.
356	   o  The <host-info> element contains information about the entity
357	      hosting the conference (e.g., its URI).
358	   o  The <conference-state> element informs the subscribers about the
359	      changes in the overall conference information.
360	   o  The <floor-information> element contains information about the
361	      status of the different floors in the conference.
362	   o  The <users> element describes the membership information as a
363	      whole.  The <users> element contains a set of <user> child
364	      elements, each describing a single participant in the conference.
365	   o  If a participant in the main conference joins a sidebar, a new
366	      element is created in the conference referenced from the
367	      <sidebars-by-ref> element or under one of the <sidebars-by-val>
368	      elements.

370	   Note that some of the elements described above such <conference-
371	   info>, <conference-description>, <sidebars-by-ref>, or <sidebars-by-
372	   val> are not defined in the data model but are defined in the data
373	   format of [RFC4575].  We describe them here because they are part of
374	   the basic structure of the data model.

376	4.  Data Model Definition

378	   The following non-normative diagram shows the structure of conference
379	   object documents.  The operator "!" preceding an element indicates
380	   that the element is mandatory in the data model.  The operator "*"
381	   following an element indicates that the element is introduced and
382	   defined in this document.  That is, elements without a "*" have
383	   already been defined in [RFC4575].

385	   !<conference-info>
386	        |
387	        |--!<conference-description>
388	        |     |--<language>*
389	        |     |--<display-text>
390	        |     |--<subject>
391	        |     |--<free-text>
392	        |     |--<keywords>
393	        |     |--<allow-sidebars>*
394	        |     |--<conference-time>*
395	        |     |      |--<entry>*
396	        |     |      |    |--<base>*
397	        |     |      |    |--<mixing-start-offset>*
398	        |     |      |    |--<mixing-end-offset>*
399	        |     |      |    |--<can-join-after-offset>*
400	        |     |      |    |--<must-join-before-offset>*
401	        |     |      |    |--<request-user>*
402	        |     |      |    |--<notify-end-of-conference>*
403	        |     |      |    |--<allowed-extend-mixing-end-offset>*
404	        |     |           ...
405	        |     |--<conf-uris>
406	        |     |      |--<entry>
407	        |     |      |    |--<uri>
408	        |     |      |    |--<display-text>
409	        |     |      |    |--<purpose>
410	        |     |      |    |--<conference-password>*
411	        |     |      ...
412	        |     |--<service-uris>
413	        |     |      |--<entry>
414	        |     |      |    |--<uri>
415	        |     |      |    |--<display-text>
416	        |     |      |    |--<purpose>
417	        |     |      ...
418	        |     |--<maximum-user-count>
419	        |     |      ...
420	        |     |--<available-media>
421	        |     |      |--!<entry>
422	        |     |      |     |--<display-text>
423	        |     |      |     |--<type>
424	        |     |      |     |--<status>
425	        |     |      |     |--<mixing-mode>*
426	        |     |      |     |--<codecs>*
427	        |     |      |     |    |--<codec>*
428	        |     |      |     |    |    |--<subtype>*
429	        |     |      |     |    |--<codec>*
430	        |     |      |     |    |    |--<subtype>*
431	        |     |      |     |    ...
432	        |     |      |     |--<controls>*
433	        |     |      |     |    |--<mute>*
434	        |     |      |     |    |--<gain>*
435	        |     |      |     |   ...
436	        |     |      |--<entry>
437	        |     |      |     |--<display-text>
438	        |     |      |     |--<type>
439	        |     |      |     |--<status>
440	        |     |      |     |--<mixing-mode>*
441	        |     |      |     |--<codecs>*
442	        |     |      |     |    |--<codec>*
443	        |     |      |     |    |    |--<subtype>*
444	        |     |      |     |    |--<codec>*
445	        |     |      |     |    |    |--<subtype>*
446	        |     |      |     |    ...
447	        |     |      |     |--<controls>*
448	        |     |      |     |    |--<pause-video>*
449	        |     |      |     |    |--<video-layout>*
450	        |     |      |     |   ...
451	        |     |      ...
452	        |
453	        |--<host-info>
454	        |     |--<display-text>
455	        |     |--<web-page>
456	        |     |--<uris>
457	        |     |     |--<entry>
458	        |     |     |    |--<uri>
459	        |     |     |    |--<display-text>
460	        |           ...
461	        |--<conference-state>
462	        |     |--<allow-conference-event-subscription>*
463	        |     |--<user-count>
464	        |     |--<active>
465	        |     |--<locked>
466	        |
467	        |--<floor-information>*
468	        |     |--<conference-ID>*
469	        |     |--<allow-floor-events>*
470	        |     |--<floor-request-handling>*
471	        |     |--<conference-floor-policy>*
472	        |     |     |--<floor>*
473	        |     |     |    |--!<media-label>*
474	        |     |     |    |--!<algorithm>*
475	        |     |     |    |--<max-floor-users>*
476	        |     |     |    |--<moderator-id>*
477	        |     |     |   ...
478	        |     |     ...
479	        |
480	        |--!<users>
481	        |     |--<join-handling>*
482	        |     |--<user-admission-policy>*
483	        |     |--<allowed-users-list>*
484	        |     |     |--<target>*
485	        |     |     |
486	        |     |     |--<persistent-list>*
487	        |     |     |     |--<user>*
488	        |     |     |     |     |-- <email>*
489	        |     |
490	        |     |--<deny-users-list>*
491	        |     |
492	        |     |--<user>
493	        |     |    |--<display-text>
494	        |     |    |--<associated-aors>
495	        |     |    |--<provide-anonymity>*
496	        |     |    |--<roles>
497	        |     |    |    |
498	        |     |    |   ...
499	        |     |    |--<languages>
500	        |     |    |--<cascaded-focus>
501	        |     |    |--<allow-refer-users-dynamically>*
502	        |     |    |--<allow-invite-users-dynamically>*
503	        |     |    |--<allow-remove-users-dynamically>*
504	        |     |    |--!<endpoint>
505	        |     |    |      |--<display-text>
506	        |     |    |      |--<referred>
507	        |     |    |      |--<status>
508	        |     |    |      |--<joining-method>
509	        |     |    |      |--<joining-info>
510	        |     |    |      |--<disconnection-method>
511	        |     |    |      |--<disconnection-info>
512	        |     |    |      |--<media>
513	        |     |    |      |    |--<type>
514	        |     |    |      |    |--<display-text>
515	        |     |    |      |    |--<label>
516	        |     |    |      |    |--<src-id>
517	        |     |    |      |    |--<status>
518	        |     |    |      |    |--<to-mixer>*
519	        |     |    |      |    |      |--<floor>*
520	        |     |    |      |    |      |--<controls>*
521	        |     |    |      |    |      |      |--<mute>*
522	        |     |    |      |    |      |      |--<gain>*
523	        |     |    |      |    |      |     ...
524	        |     |    |      |    |--<from-mixer>*
525	        |     |    |      |    |      |--<floor>*
526	        |     |    |      |    |      |--<controls>*
527	        |     |    |      |    |      |      |--<pause-video>*
528	        |     |    |      |    |      |     ...
529	        |     |    |      |   ...
530	        |     |    |      |--<call-info>
531	        |     |    |      |    |--<sip>
532	        |     |    |      |    |   |--<display-text>
533	        |     |    |      |    |   |--<call-id>
534	        |     |    |      |    |   |--<from-tag>
535	        |     |    |      |    |   |--<to-tag>
536	        |          ...    ...
537	        |--<sidebars-by-ref>
538	        |     |--<entry>
539	        |     |     |-- <user>
540	        |     |     |-- <display-text>
541	        |     |--<entry>
542	        |     |     |-- <user>
543	        |     |     |-- <display-text>
544	        |     ...
545	        |--<sidebars-by-val>
546	        |     |--<entry>
547	        |     |     |
548	        |     |    ...
549	        |     |--<entry>
550	        |     |     |
551	        |     ...   ...

553	                      Figure 3: Non-normative diagram

555	   The following sections describe these elements in detail.  The full
556	   Relax NG schema is provided Section 5.

558	4.1.  <conference-info>

560	   A conference object document begins with the root element tag
561	   <conference-info>, which is defined in [RFC4575].  The <conference-
562	   info> attributes are described in [RFC4575].  Note that the
563	   <conference-info> element does not have the attributes 'state' and
564	   'version' defined in [RFC4575] for this element because these
565	   attributes only apply to notification mechanisms.

567	   In addition, [RFC4575] defines an 'entity' attribute that contains
568	   the conference object identifier (XCON-URI) that identifies the
569	   conference being described in the document.

571	   The <conference-info> element contains the <conference-description>,
572	   <host-info>, <conference-state>, <floor-information>, <users>,
573	   <sidebars-by-ref>, and <sidebars-by-val> child elements.  All these
574	   elements, except <floor-information>, are defined in [RFC4575].  A
575	   conference document MUST at least include the <conference-
576	   description> and <users> child elements.

578	4.2.  <conference-description>

580	   The <conference-description> element, which is defined in [RFC4575],
581	   describes the conference as a whole.  It should have an extra
582	   attribute 'lang' to specify the language used in the contents of this
583	   element.  It is comprised of <language>, <display-text>, <subject>,
584	   <free-text>, <keywords>, <allow-sidebars>, <conference-time>, <conf-
585	   uris>, <service-uris>, <maximum-user-count>, and <available-media>.

587	   The following sections describe these elements in more detail.  Other
588	   child elements MAY be defined in the future to extend the
589	   <conference-description> element.

591	4.2.1.  <language>

593	   The <language> element indicates the predominant language that is
594	   expected to be employed within a conference.  This element is not
595	   enforcing the language of the conference, but only informs the
596	   participants about the desirable language that they should use in the
597	   conference.  Participants are free to switch to other languages if
598	   they like.

600	4.2.2.  <display-text>

602	   The <display-text> element is described in section 5.3 of [RFC4575].

604	4.2.3.  <subject>

606	   The <subject> element is described in section 5.3 of [RFC4575].

608	4.2.4.  <free-text>

610	   The <free-text> element is described in section 5.3 of [RFC4575].

612	4.2.5.  <keywords>

614	   The <keywords> element is described in section 5.3 of [RFC4575].

616	4.2.6.  <allow-sidebars>

618	   The <allow-sidebars> element represents a boolean action.  If set to
619	   TRUE, the conference is allowed to create sidebar conferences.

621	4.2.7.  <conference-time>

623	   The <conference-time> element contains the information related to
624	   conference time and duration of a conference.  The <conference-time>
625	   element contains one or more <entry> elements each defining the time
626	   information specifying a single conference occurrence.

628	   Every <entry> element contains the following child elements:

630	   o  <base>: The <base> child element specifies the iCalendar object of
631	      the conference.  The iCalendar object components are defined in
632	      [RFC2445].
633	   o  <mixing-start-offset>: The <mixing-start-offset> child element
634	      specifies when the conference media mixing starts before the
635	      conference starts.  If the <mixing-start-offset> element is not
636	      present, it indicates that the conference media mixing starts
637	      immediately.  The <mixing-start-offset> has the mandatory
638	      'required-participant' attribute.  This attribute contains one of
639	      the following values: "none", "administrator", "moderator",
640	      "user", "observer", and "participant".  The roles semantic
641	      definition is out of the scope of this document and is subject to
642	      future policy documents.  More values can be specified in the
643	      future.  The 'required-participant' attribute allows a privileged
644	      user to define when media mixing starts based on the latter of the
645	      mixing start time, and the time the first participant arrives.  If
646	      the value is set to "none'", mixing starts according to the mixing
647	      start time.
648	   o  <mixing-end-offset>: The <mixing-end-offset> child element that
649	      specifies the time a conference media mixing stops after the
650	      conference stops.  If the <mixing-end-offset> element is not
651	      present, it indicates that the conference occurrence is not
652	      bounded.  The <mixing-end-offset> element has the mandatory
653	      'required-participant' attribute.  This attribute contains one of
654	      the following values: "none", "administrator", "moderator",
655	      "observer", "user", and "participant".  More values can be
656	      specified in the future.  The 'required-participant' attribute
657	      allows a privileged user to define when media mixing ends based on
658	      the earlier of the <mixing-end-offset>, and the time the last
659	      participant leaves.  If the value is set to "none", mixing stops
660	      according to the <mixing-end-offset>.  If the conference policy
661	      was modified so that last privileged user is now a normal
662	      conference participant, and the conference requires a privileged
663	      user to continue; that conference MUST terminate.
664	   o  <can-join-after-offset>: An administrator can indicate the time
665	      when users can join a conference by populating the <can-join-
666	      after-offset> element.
667	   o  <must-join-before-offset>: An administrator can define the time
668	      after which new users are not allowed to join the conference
669	      anymore.
670	   o  <request-user>: It is possible to define the time when users or
671	      resources on the <allowed-users-list> are requested to join the
672	      conference by using the <request-users> element.
673	   o  <notify-end-of-conference>: The <notify-end-of-conference> element
674	      defines in seconds when the system has to send a notification when
675	      the end of the conference is approaching.  If the <notify-end-of-
676	      conference> element is not present, it indicates that the system
677	      does not notify the users when the end of the conference is
678	      approaching.
679	   o  <allowed-extend-mixing-end-offset>: The <allowed-extend-mixing-
680	      end-offset> refers to the possibility to extend the conference.
681	      It has a boolean value.

683	4.2.8.  <conf-uris>

685	   The <conf-uris> contains the identifiers to be used in order to
686	   access the conference by different signaling means.  This document
687	   describes a new element, <conference-password>.  This element
688	   contains the password(s) of the conference, for instance, PSTN
689	   conference will store the 'PIN code' in this element.  All the other
690	   <conf-uris> child element are described in section 5.3.1 of
691	   [RFC4575].  Future extensions to this schema may define new values
692	   and register them with IANA.

694	4.2.9.  <service-uris>

696	   The <service-uris> describes auxiliary services available for the
697	   conference.  The <service-uris> element is described in section 5.3.2
698	   of [RFC4575].  Future extensions to this schema may define new values
699	   and register them with IANA.

701	4.2.10.  <maximum-user-count>

703	   The <maximum-user-count> contains the overall number of users allowed
704	   to join the conference.  Note that this value is set by an
705	   administrator and can reflect any local policies such as network
706	   consumption, CPU processing power, and licensing rules.

708	4.2.11.  <available-media>

710	   The <available-media> element consists of a sequence of <entry> child
711	   elements.  Each <entry> element contain the 'label' attribute that is
712	   the media stream identifier assigned by the conferencing server.  The
713	   attribute 'label' is described in [RFC4575], section 5.3.4.  Each
714	   <entry> element contains the following child elements:

716	   o  The <type> element is described in section 5.3.4 of [RFC4575].
717	   o  The <display-text> element is described in section 5.3.4 of
718	      [RFC4575].
719	   o  The <status> element is described in section 5.3.4 of [RFC4575].
720	   o  The child element <mixing-mode> describes a default policy by
721	      which the mixer will build the outgoing stream from the incoming
722	      streams.  Note that this policy is different than the policy
723	      describing the floors for each media.  The <mixing-mode> child
724	      element MUST contain one and only one of the "Moderator-
725	      controlled", "FCFS", and "Automatic" values indicating the default
726	      algorithm to use with every media stream.  The "Moderator-
727	      controlled" value indicates that the moderator of the conference,
728	      controls the media stream policy.  The "FCFS" value indicates a
729	      'first-come-first-served' policy.
730	   o  The <codecs> element specifies the allowed codecs in the
731	      conference.  It has an attribute 'decision' that specifies if the
732	      focus decides the common codec automatically or needs the approval
733	      of the moderator of the conference ("automatic", "moderator-
734	      controlled").  The <codecs> element contains <codec> elements.  A
735	      <codec> element can have the attribute 'name' and 'policy'.  The
736	      'name' attribute is a codec identifier assigned by the
737	      conferencing server.  The 'policy' attribute contains the policy
738	      for that codec (allowed, or disallowed).  The <codec> element has
739	      the child element <subtype> which stores the codec's name.  The
740	      possible values of this element are the values of the 'subtype'
741	      column of the RTP Payload Format media types per [RFC4855] defined
742	      in IANA [IANA].  It is expected that future conferencing
743	      specifications will define corresponding schema extensions, as
744	      appropriate.
745	   o  The <controls> element contains the basic audio and video global
746	      control elements for a conference.  It is expected that for the
747	      majority of the basic conferences, these controls are sufficient.
748	      If the conference server wants to support more advanced controls,
749	      then it is recommended that an extension to the data model be
750	      used.  In the <controls> element the schema is extensible, hence
751	      new control types can be added in the future.  So moderator
752	      controls that affect all media output would go under the
753	      <available-media> element.  The following controls elements are
754	      defined for <controls>:

756	      *  The <mute> element is used in conjunction with an audio stream
757	         to cease transmission of associated media.  That means that for
758	         the entire duration where mute is applicable, all current and
759	         future participants of the conference are muted and will not
760	         receive any audio.  It has a "boolean" value.  If this control
761	         is not specified, access to the control is not available to the
762	         client.
763	      *  The <pause-video> element is used in conjunction with a video
764	         stream to cease transmission of associated media.  It has a
765	         "boolean" value.  If this control is not specified, the access
766	         to the control is not available to the client.
767	      *  The <gain> element is used in conjunction with a media output
768	         stream to indicate the amount of amplification of an audio
769	         stream.  The value is an integer number that ranges from -127
770	         to 127.  If this control is not specified, access to the
771	         control is not available to the client.
772	      *  The <video-layout> element is used in conjunction with a video
773	         stream to specify how the video streams (of participants) are
774	         viewed by each participant.  Only one layout type can be
775	         specified for each output stream.  If there are fewer
776	         participants than panels in the specified layout, then blanking
777	         (black screen) MAY be mixed into the stream on the behalf of
778	         the missing input streams.  If unspecified, the <video-layout>
779	         default type SHOULD be "single-view".  The <video-layout> types
780	         are as follows, although any number of custom layouts may be
781	         specified in future extensions:
782	         +  single-view: Only one stream is presented by the focus to
783	            all participants in one panel.
784	         +  dual-view: This dual view option will present the video
785	            side-by-side in 2 panels and not alter the aspect ratio of
786	            the streams.  This will require the focus to introduce
787	            blanking on parts of the overall image as viewed by the
788	            participants.
789	         +  dual-view-crop: This side-by-side layout option instructs
790	            the focus to alter the aspect ratio of the streams (alter-
791	            aspect-ratio=TRUE) so that blanking is not necessary.  The
792	            focus handles the cropping of the streams.
793	         +  dual-view-2x1: This layout option instructs the focus to
794	            place one stream above the other, in essence with two rows
795	            and one column.  In this option the aspect ratio is not
796	            altered and blanking is introduced.
797	         +  dual-view-2x1-crop: This layout option also instructs the
798	            focus to place one stream above the other, in essence with
799	            two rows and one column.  In this option the aspect ratio is
800	            altered and the video streams are cropped.
801	         +  quad-view: Four equal-sized panels in a 2x2 layout is
802	            presented by the focus to all participants.  Typically the
803	            aspect ratio of the streams are maintained (alter-aspect-
804	            ratio= FALSE).
805	         +  multiple-3x3: Nine equal-sized panels in a 3x3 layout is
806	            presented by the focus to all participants.  Typically the
807	            aspect ratio of the streams are preserved.
808	         +  multiple-4x4: Sixteen equal-sized panels in a 4x4 layout is
809	            presented by the focus to all participants.  Typically the
810	            aspect ratio of the streams are preserved.
811	         +  multiple-5x1: This option refers to a 5x1 layout where one
812	            panel will occupy 4/9 of the mixed video stream while the
813	            others will each occupy 1/9 of the stream.  Typically the
814	            aspect ratio of the streams is preserved.
815	         +  automatic: This option allows the focus to add panels as
816	            streams are added.

818	4.3.  <host-info>

820	   The <host-info> element contains information about the entity hosting
821	   the conference.  This information is set before conference
822	   activation, and is rarely changed during the conference lifetime.
823	   The <host-info> element and its child elements are described in
824	   [RFC4575], section 5.4.  Future extensions to the <host-info> element
825	   may define new values.

827	4.4.  <conference-state>

829	   The <conference-state> is introduced in RFC4575 [RFC4575].  The
830	   <conference-state> element contains the <allow-conference-event-
831	   subscription>, <user-count>, <active>, and <locked> child elements.

833	4.4.1.  <allow-conference-event-subscription>

835	   The <allow-conference-event-subscription> element represents a
836	   boolean action.  If set to TRUE, the focus is instructed to allow the
837	   subscription to conference state events, such as RFC4575 'SIP Event
838	   Package for Conference State' [RFC4575].  If set to FALSE, the
839	   subscription to conference state events would be rejected.  If this
840	   element is undefined it has a default value of TRUE, causing the
841	   subscription to conference state events to be accepted.

843	4.4.2.  <user-count>

845	   The <user-count> child element is explained in [RFC4575], section
846	   5.5.1.

848	4.4.3.  <active>

850	   The <active> child element is explained in [RFC4575], section 5.5.2.

852	4.4.4.  <locked>

854	   The <locked> child element is explained in [RFC4575], section 5.5.3.

856	4.5.  <floor-information>

858	   The <floor-information> element contains the <conference-ID>, <allow-
859	   floor-events>, <floor-request-handling>, and <conference-floor-
860	   policy> child elements.  Other elements from different namespaces MAY
861	   be present for the purposes of extensibility.  The absence of this
862	   element from an XML document indicates that the conference does not
863	   have a floor.

865	4.5.1.  <conference-ID>

867	   The <conference-ID> represents a conference instance within floor
868	   control.  When created within the conferencing system, the
869	   'conference-ID' can be represented by the unique conference object
870	   Identifier (XCON-URI).  When BFCP serves as the floor control
871	   protocol, the <conference-ID> is a 32-bit BFCP conference identifier
872	   defined in [RFC4582] section 5.1 and there is a 1:1 mapping to the
873	   XCON-URI.

875	4.5.2.  <allow-floor-events>

877	   The <allow-floor-events> element represents a boolean action.  If set
878	   to TRUE, the focus is instructed to accept the subscription to floor
879	   control events.  If set to FALSE, the focus is instructed to reject
880	   the subscription.  If this element is undefined, it has a default
881	   value of FALSE, causing the subscription to floor control events to
882	   be rejected.

884	   There are two methods which a conference participant subscribes
885	   himself to a floor control event.  One method is using an offer/
886	   answer exchange mechanism ([RFC3264]) using SIP INVITE and BFCP
887	   parameters in the SDP ([RFC4583]).  The other method is a general
888	   authorization mechanism described in section 9 of [RFC4582] and in
889	   [RFC5018].  Future documentation may define additional connection
890	   mechanisms.

892	4.5.3.  <floor-request-handling>

894	   The <floor-request-handling> element defines the actions used by the
895	   conference focus to control floor requests.  This element defines the
896	   action that the focus is to take when processing a particular request
897	   to a floor within a conference.  This element defines values of:

899	   o  "block": This action instructs the focus to deny the floor
900	      request.  This action is the default action taken in the absence
901	      of any other actions.
902	   o  "confirm": This action instructs the focus to allow the request.
903	      The focus then uses the defined floor algorithm to further allow
904	      or deny the floor.  The algorithms used are outside the scope of
905	      this document.

907	   Note that this section discusses floor control information,
908	   therefore, the value "block" in a <floor-request-handling> element is
909	   not related with the "block" value in the <join-handling> element
910	   (see Section 4.6).

912	4.5.4.  <conference-floor-policy>

914	   The <conference-floor-policy> element has one or more <floor> child
915	   elements.  Every <floor> child elements has an attribute 'id' which
916	   uniquely identifies a floor or floors within a conference.  In the
917	   case of BFCP [RFC4582], the 'id' attribute corresponds to the
918	   floor-id identifier defined in [RFC4582] section 5.2.2.

920	   o  <media-label>: Every floor is identified for one or more mandatory
921	      <media-label> element.  If the <available-media> information is
922	      included in the conference document, the value of this element
923	      MUST be equal to the 'label' value of the corresponding media
924	      stream <entry> in the <available-media> container.  The number of
925	      those elements indicates how many floors the conference can have.
926	      A floor can be used for one or more media types;
927	   o  <algorithm>: A floor can be controlled using many algorithms; the
928	      mandatory <algorithm> element MUST be set to any of the
929	      "moderator-controlled", "FCFS" or "random" values indicating the
930	      algorithm.  The "Moderator-controlled" value indicates that the
931	      moderator of the conference controls the floor.  The "FCFS" value
932	      states for 'first-come-first-served' floor control.
933	   o  <max-floor-users>: The <max-floor-users> child element in the
934	      <floor> element is optional and, if present, dictates the maximum
935	      number of users who can have the floor at one time.
936	   o  <moderator-id>: The optional <moderator-id> indicates the 'User
937	      ID' of the moderator(s).  It MUST be set if the element
938	      <algorithm> is set to "Moderator-controlled" value.  When the
939	      floor is created within the conferencing system, the XCON-User
940	      identifier MAY be used as the moderator-id.  In the case of BFCP
941	      as the floor control protocol, the <moderator-id> is defined in
942	      [RFC4582] section 3.  Note that [RFC4582] refers to the moderator
943	      role as a 'floor chair'.

945	4.6.  <users>

947	   The <users> element is described in [RFC4575] and contains the <join-
948	   handling>, <user-admission-policy>, <allowed-users-list> and <deny-
949	   users-list> defined in this document and <user> child elements
950	   defined in [RFC4575].  Note that the <users> element does not have
951	   the attribute 'state' defined in [RFC4575] for this element because
952	   this attribute only applies to notifications mechanism.  The
953	   following sections describe these elements in more detail.  Other
954	   child elements and attributes can be used to extend <users> in the
955	   future.

957	4.6.1.  <join-handling>

959	   The <join-handling> element defines the actions used by the
960	   conference focus to control conference participation.  This element
961	   defines the action that the focus is to take when processing a
962	   particular request to join a conference.  This element defines values
963	   of:
964	   o  "block": This action instructs the focus to deny access to the
965	      conference.  This action is the default action taken in the
966	      absence of any other actions.
967	   o  "confirm": This action instructs the focus to place the
968	      participant on a pending list (e.g., by parking the call on a
969	      music-on-hold server), awaiting moderator input for further
970	      actions.
971	   o  "allow": This action instructs the focus to accept the conference
972	      join request and grant access to the conference within the
973	      instructions specified in the transformations of this rule.
974	   o  "authenticate": This action instructs the focus that the user has
975	      to provide a combination of username/password.
976	   o  "directed-operator": This action instructs the focus to direct the
977	      user to an operator.

979	4.6.2.  <user-admission-policy>

981	   The <user-admission-policy> is an element that lets an organizer (or
982	   a participant with appropriate rights) choose a policy for the
983	   conference that controls how users are allowed into the conference.
984	   The list of possible values are:

986	   o  "closedAuthenticated": A 'closedAuthenticated' policy requires
987	      each conference participant to be in the allowed users list
988	      (listed under the <allowed-users-list> XML element) with each
989	      participant being sufficiently (up to local policy) authenticated.
990	      Conference join requests for users not in the allowed users list
991	      or participants not authenticated should be rejected unless a
992	      <join-handling> action of 'confirm' is selected in which case the
993	      user is placed on a pending list as indicated earlier.
994	   o  "openAuthenticated": An 'openAuthenticated' policy requires each
995	      conferencing participant to be sufficiently authenticated (as
996	      before) but does not restrict which participants can join the
997	      conference.  Typically this implies that anyone capable of
998	      authenticating with the conferencing system may join the
999	      conference.
1000	   o  "anonymous": An 'anonymous' policy allows any join requests in and
1001	      is the least restrictive policy.

1003	4.6.3.  <allowed-users-list>

1005	   The <allowed-users-list> child element contains a list of user URIs
1006	   (e.g.  SIP URI, xcon-userid defined in Section 4.6.5), roles (defined
1007	   in Section 4.6.5.4), or domains (e.g.: *@example.com) that the focus
1008	   uses to determine who can join the conference, who can be invited to
1009	   join a conference, or who the focus needs to "refer to" the
1010	   conference.  The <allowed-users-list> element includes zero or more
1011	   <target> child elements.  This child element includes the mandatory
1012	   'uri' attribute and the mandatory 'method' attribute.  The same 'uri'
1013	   attribute with different method values can appear in the list more
1014	   than once.

1016	   The 'method' attribute is a list with the following values:

1018	   o  "dial-in": The value "dial-in" is used by the focus to determine
1019	      who can join the conference.
1020	   o  "dial-out": The value "dial-out" contains a list of resources that
1021	      the focus will initiate a session with.
1022	   o  "refer": The value "refer" is used by the focus to determine the
1023	      resources that the focus needs to "refer to" the conference.  In
1024	      SIP, this is achieved by the focus sending a REFER request to
1025	      those potential participants.  In a different paradigm, this could
1026	      also mean that the focus sends an SMS or an email to the referred
1027	      user.  This list can be updated during the conference lifetime so
1028	      it can be used for mid-conference refers as well.

1030	   The "refer" value differs from the "dial-out" in that the resources
1031	   on the "refer" value are expected to initiate the session
1032	   establishment toward the focus themselves.  It is also envisioned
1033	   that different users will have different access rights to those lists
1034	   and therefore a separation between the two is needed.

1036	   The <allowed-users-list> element has a <persistent-list> child
1037	   element as well.  Some chatroom systems allow -- and some require --
1038	   registration of detailed information about a user before they are
1039	   allowed to join a chatroom.  The <persistent-list> child element
1040	   stores persistent information about users who are not actively part
1041	   of an ongoing chatroom session.  The <persistent-list> element stores
1042	   the following information:

1044	   o  user: The <user> element stores the name, nickname, the conference
1045	      user identifier (XCON-USERID) and email address of a user.  It has
1046	      three attributes: 'name', 'nickname' and 'id' and an <email>
1047	      element.  Future extensions to this schema may define new elements
1048	      for the <user> element.

1050	   Future extensions to this schema may define new elements for the
1051	   <target> element.

1053	4.6.4.  <deny-users-list>

1055	   The <deny-users-list> child element contains a list of user URIs
1056	   (e.g.  SIP URI, xcon-userid defined in Section 4.6.5), roles (defined
1057	   in Section 4.6.5.4), or domains (e.g.: *@example.com) that the focus
1058	   uses to determine who has been 'banned' from the conference.  Such
1059	   banned users are prevented from re-joining the chatroom until they
1060	   have been un-banned.

1062	4.6.5.  <user> and Its <user> Sub-elements

1064	   The element <user> is described in [RFC4575] and describes a single
1065	   participant in the conference.  The <user> element has an attribute
1066	   'entity'.  Note that the <user> element does not have the attribute
1067	   'state' defined in [RFC4575] for this element because this attribute
1068	   only applies to notifications mechanism.

1070	   The attribute 'entity' contains a unique conference user identifier
1071	   (XCON-USERID) within the scope of a conferencing system.  The URI
1072	   format of this identifier is as follow:

1074	    XCON-USERID = "xcon-userid" ":" conf-user-id

1076	    conf-user-id = 1*(unreserved)

1078	   [unreserved is defined in RFC3986]

1080	   Other user identifiers can be associated with this conference user
1081	   identifier and enable the conferencing system to correlate and map
1082	   these multiple authenticated user identities to a single global user
1083	   identifier.  Figure 4 illustrates an example using the conference
1084	   user identifier in association with the user identity defined for
1085	   BFCP, SIP, and H323 user identity.  It should be noted that a
1086	   conferencing system is free to structure such relationships as
1087	   required and this information is just included as a guideline that
1088	   can be used.

1090	                         +----------------+
1091	                         |   Conference   |
1092	                         |      User      |
1093	                         |   Identifier   |
1094	                         +----------------+
1095	                         |xcon-userid:John|
1096	                         +-------+--------+
1097	                                 |
1098	                                 |
1099	                                 |
1100	          +----------------------+-------------------------+
1101	          |                      |                         |
1102	  +-------+--------+ +-----------+-----------+ +-----------+-----------+
1103	  |  BFCP User ID  | |      SIP User URI     | |     H323 User URI     |
1104	  +----------------+ +-----------------------+ +-----------------------+
1105	  |      543       | |sip:851221@example.com | |h323:taeduk@example.com|
1106	  +----------------+ +-----------------------+ +-----------------------+

1108	                     Figure 4: Conference User Mapping

1110	   The element <user> element contains the <display-text>, <associated-
1111	   aors>, <provide-anonymity>, <roles>, <languages>, <cascaded-focus>,
1112	   <allow-refer-users-dynamically>, <allow-invite-users-dynamically>,
1113	   <allow-remove-users-dynamically>, and <endpoint>.  The following
1114	   sections describe these elements in more detail.

1116	4.6.5.1.  <display-text>

1118	   The <display-text> child element is explained in [RFC4575], section
1119	   5.6.1.

1121	4.6.5.2.  <associated-aors>

1123	   The <associated-aors> child element is explained in [RFC4575],
1124	   section 5.6.2.

1126	4.6.5.3.  <provide-anonymity>

1128	   The <provide-anonymity> element provides anonymity to the user.  In
1129	   this case, the focus provides to the rest of the participants an
1130	   anonymous identity for that user, for example anonymousX, or it does
1131	   not provide any information for that user such that other users can
1132	   not see he is a participant in the conference.  This element only
1133	   affects the way the user information is provided to the other
1134	   participants.  The real information about the user is still stored in
1135	   the data model.  This can be achieved by using the <provide-
1136	   anonymity> element.  This element has three values: 'private', 'semi-
1137	   private' and 'hidden'.  The 'private' value specifies that this user
1138	   is completely anonymous in the conference. 'semi-private' value
1139	   specifies that this user is anonymous to all users with equal or
1140	   lesser permissions in the conference. 'hidden' value specifies that
1141	   other users can not see this participant in the conference.

1143	4.6.5.4.  <roles>

1145	   A role provides the context for the set of conference operations that
1146	   a participant can perform.  This element can contain one of the
1147	   following values: "administrator", "moderator", "user",
1148	   "participant", "observer", and "none".  The roles semantic definition
1149	   is out of the scope of this document and is subject to future policy
1150	   documents.  This element can be extended with new roles in future
1151	   documents.

1153	4.6.5.5.  <languages>

1155	   The <languages> child element is explained in [RFC4575], section
1156	   5.6.4.

1158	4.6.5.6.  <cascaded-focus>

1160	   The <cascaded-focus> child element is explained in [RFC4575], section
1161	   5.6.5.

1163	4.6.5.7.  <allow-refer-users-dynamically>

1165	   The <allow-refer-users-dynamically> element represents a boolean
1166	   action.  If set to TRUE, a participant is allowed to instruct the
1167	   focus to refer a user to the conference without modifying the
1168	   <allowed-users-list> (in SIP terms, a participant is allowed to send
1169	   a REFER request to the focus which results in the focus sending a
1170	   REFER request to the user the referrer wishes to join the
1171	   conference).  If set to FALSE, the refer request is rejected.  If
1172	   this element is undefined it has a value of FALSE, causing the refer
1173	   to be rejected.

1175	4.6.5.8.  <allow-invite-users-dynamically>

1177	   The <allow-invite-users-dynamically> element represents a boolean
1178	   action.  If set to TRUE, a participant is allowed to instruct the
1179	   focus to invite a user to the conference without modifying the
1180	   <allowed-users-list> list (in SIP terms, a participant is allowed to
1181	   send a REFER request to the focus which results in the focus sending
1182	   an INVITE request to the user the referrer wishes to join the
1183	   conference).  If set to FALSE, the refer request is rejected.  If
1184	   this element is undefined it has a value of FALSE, causing the refer
1185	   to be rejected.

1187	4.6.5.9.  <allow-remove-users-dynamically>

1189	   The <allow-remove-users-dynamically> element represents a boolean
1190	   action.  If set to TRUE, a participant is allowed to instruct the
1191	   focus to remove a user from the conference without modifying the
1192	   ruleset (in SIP terms, a participant is allowed to send a REFER
1193	   request to the focus which results in the focus sending an BYE
1194	   request to the user the referrer wishes to leave the conference).  If
1195	   set to FALSE, the refer request is rejected.  If this element is
1196	   undefined it has a value of FALSE, causing the refer to be rejected.

1198	4.6.5.10.  <endpoint>

1200	   The <endpoint> child element is defined in [RFC4575].  It can provide
1201	   the desired level of detail about the user's devices and their
1202	   signaling sessions taking part in the conference.  The <endpoint>
1203	   element in this document does not defined the 'state' attribute
1204	   defined in [RFC4575] for the same element since the 'state' attribute
1205	   only applies to notification mechanisms.

1207	   The <endpoint> element has the following child elements: <display-
1208	   text>, <referred>, <status>, <joining-method>, <joining-info>,
1209	   <disconnection-method>, <disconnection-info>, <media>, <floor>,and
1210	   <call-info>.  All the <endpoint> child elements are defined in
1211	   [RFC4575] with the exception of the <floor> element.

1213	   The <floor> element describes a floor that joins this participant in
1214	   the conference.  If a participant, for instance, needs to talk in the
1215	   conference, it first needs to get the floor from the chair of the
1216	   conference.  The <floor> element has an attribute 'id' which uniquely
1217	   identifies a floor or floors within a conference.  The 'id' attribute
1218	   corresponds to the floor-id identifier defined in [RFC4582] section
1219	   5.2.2.  The <floor> element has a "Boolean" value.  A value of FALSE
1220	   indicates that this user does not hold the floor in this moment.  If
1221	   this control is not specified, this user SHOULD NOT specify the floor
1222	   option.

1224	   Besides the <floor> element, the <endpoint>/<media> element has two
1225	   other child elements defined in this document, the <to-mixer>, and
1226	   the <from-mixer>:

1228	   o  <from-mixer>, <to-mixer>: These are controls that apply to a
1229	      user's media stream being sent from the mixer to the participants
1230	      endpoint or to the mixer from the participants endpoint.  The <to-
1231	      mixer> element details properties associated with the incoming
1232	      streams to the mixer (streams sent to the mixer from the
1233	      participant).  The <from-mixer> element details properties
1234	      associated with the outgoing streams from the mixer (sent from the
1235	      mixer to the participant).  Both of these elements have the
1236	      attribute 'name'.  The 'name' attribute has the values "VideoIn",
1237	      "VideoOut", "AudioOut", and "AudioIn".  The "VideoOut" and
1238	      "AudioOut" media streams detail properties associated with the
1239	      outgoing video and audio from the mixer.  The "VideoIn" and
1240	      "AudioIn" media stream details properties associated with the
1241	      incoming video and audio to the mixer.  More values can be defined
1242	      in the future.  The <to-mixer> and <from-mixer> elements have the
1243	      <controls> child element:
1244	      *  Controls that apply to a specific user would appear under the
1245	         <controls> element.

1247	4.7.  <sidebars-by-ref>

1249	   The <sidebars-by-ref> element contains a set of <entry> child
1250	   elements.  This element is described in [RFC4575], 5.9.1.  Note that
1251	   the <sidebars-by-ref> element does not have the attribute 'state'
1252	   defined in [RFC4575] for this element because this attribute only
1253	   applies to notifications mechanism.

1255	4.8.  <sidebars-by-val>

1257	   The <sidebars-by-val> element contains a set of <entry> child
1258	   elements each containing information about a single sidebar.  This
1259	   element is described in [RFC4575], 5.9.2.  Note that the <sidebars-
1260	   by-val> element does not have the attribute 'state' defined in
1261	   [RFC4575] for this element because this attribute only applies to
1262	   notifications mechanism.

1264	5.  RELAX NG Schema

1266	   In accordance with the Centralized Conferencing Framework document
1267	   [RFC5239], the Conference Object is a logical representation of a
1268	   conference instance.  The conference information schema contains core
1269	   information that is utilized in any conference.  It also contains the
1270	   variable information part of the Conference Object.

1272	   The normative schema is backwards compatible with the [RFC5239], in
1273	   other words, valid [RFC5239] instance documents are also valid
1274	   according to this RELAX NG schema [RELAX].  In addition to
1275	   approximately similar RELAX NG [RELAX] definitions of the [RFC5239],
1276	   this schema contains extension elements in the
1277	   "urn:ietf:params:xml:ns:xcon-conference-info" namespace.

1279	 default namespace = "urn:ietf:params:xml:ns:conference-info"
1280	 namespace xcon = "urn:ietf:params:xml:ns:xcon-conference-info"

1282	 start = element conference-info { conference-type }
1283	 # CONFERENCE TYPE
1284	 conference-type =
1285	   attribute entity { text }
1286	   & anyAttribute
1287	   & conference-description-type?
1288	   & element host-info { host-type }?
1289	   & element conference-state { conference-state-type }?
1290	   & element users { users-type }?
1291	   & element sidebars-by-ref { uris-type }?
1292	   & element sidebars-by-val { sidebars-by-val-type }?
1293	   & element xcon:floor-information { floor-information-type }?
1294	   & anyElement*
1295	 # CONFERENCE DESCRIPTION TYPE
1296	 conference-description-type =
1297	   element conference-description {
1298	     attribute xml:lang { xsd:language }?
1299	     & anyAttribute
1300	     & element display-text { text }?
1301	     & element subject { text }?
1302	     & element free-text { text }?
1303	     & element keywords {
1304	         list { xsd:string* }
1305	       }?
1306	     & element conf-uris { uris-type }?
1307	     & element service-uris { uris-type }?
1308	     & element maximum-user-count { xsd:int }?
1309	     & element available-media { conference-media-type }?
1310	     & element xcon:language { xsd:language }?
1311	     & element xcon:allow-sidebars { xsd:boolean }?
1312	     & element xcon:conference-time { conferencetime-type }?
1313	     & anyElement*
1314	   }
1315	 # HOST TYPE
1316	 host-type =
1317	   element display-text { text }?
1318	   & element web-page { xsd:anyURI }?
1319	   & element uris { uris-type }?
1320	   & anyElement*
1321	   & anyAttribute
1322	 # CONFERENCE STATE TYPE
1323	 conference-state-type =
1324	   anyAttribute
1325	   & element user-count { xsd:unsignedInt }?
1326	   & element active { xsd:boolean }?
1327	   & element locked { xsd:boolean }?
1328	   & element xcon:allow-conference-event-subscription { xsd:boolean }?
1329	   & anyElement*
1330	 # CONFERENCE MEDIA TYPE
1331	 conference-media-type =
1332	   anyAttribute
1333	   & element entry { conference-medium-type }*
1334	   & anyElement*
1335	 # CONFERENCE MEDIUM TYPE
1336	 conference-medium-type =
1337	   attribute label { text }
1338	   & anyAttribute
1339	   & element display-text { text }?
1340	   & element type { text }?
1341	   & element status { media-status-type }?
1342	   & element xcon:mixing-mode { mixing-mode-type }?
1343	   & element xcon:codecs { codecs-type }?
1344	   & element xcon:controls { control-type }?
1345	   & anyElement*
1346	 # URIs TYPE
1347	 uris-type =
1348	   anyAttribute
1349	   & element entry { uri-type }*
1350	   & anyElement*
1351	 # URI TYPE
1352	 uri-type =
1353	   element uri { xsd:anyURI }
1354	   & element display-text { text }?
1355	   & element purpose { text }?
1356	   & element modified { execution-type }?
1357	   & element xcon:conference-password { text }?
1358	   & anyElement*
1359	   & anyAttribute
1360	 # USERS TYPE
1361	 users-type =
1362	   anyAttribute
1363	   & element user { user-type }*
1364	   & element xcon:join-handling { join-handling-type }?
1365	   & element xcon:user-admission-policy { user-admission-policy-type }?
1366	   & element xcon:allowed-users-list { allowed-users-list-type }?
1367	   & element xcon:deny-users-list { deny-user-list-type }?
1368	   & anyElement*
1369	 # USER TYPE
1370	 user-type =
1371	   attribute entity { xsd:anyURI }
1372	   & anyAttribute
1373	   & element display-text { text }?
1374	   & element associated-aors { uris-type }?
1375	   & element roles {
1376	       element entry { single-role-type }+
1377	     }?
1378	   & element languages {
1379	       list { xsd:language }
1380	     }?
1381	   & element cascaded-focus { xsd:anyURI }?
1382	   & element endpoint { endpoint-type }*
1383	   & element xcon:provide-anonymity { provide-anonymity-type }?
1384	   & element xcon:allow-refer-users-dynamically { xsd:boolean }?
1385	   & element xcon:allow-invite-users-dynamically { xsd:boolean }?
1386	   & element xcon:allow-remove-users-dynamically { xsd:boolean }?
1387	   & anyElement*
1388	 # ENDPOINT TYPE
1389	 endpoint-type =
1390	   attribute entity { text }
1391	   & anyAttribute
1392	   & element display-text { text }?
1393	   & element referred { execution-type }?
1394	   & element status { endpoint-status-type }?
1395	   & element joining-method { joining-type }?
1396	   & element joining-info { execution-type }?
1397	   & element disconnection-method { disconnection-type }?
1398	   & element disconnection-info { execution-type }?
1399	   & element media { media-type }*
1400	   & element call-info { call-type }?
1401	   & element xcon:floor {
1402	       attribute id { text },
1403	       anyAttribute,
1404	       xsd:boolean
1405	     }*
1406	   & anyElement*
1407	 # ENDPOINT STATUS TYPE
1408	 endpoint-status-type =
1409	   "pending"
1410	   | "dialing-out"
1411	   | "dialing-in"
1412	   | "alerting"
1413	   | "on-hold"
1414	   | "connected"
1415	   | "muted-via-focus"
1416	   | "disconnecting"
1417	   | "disconnected"
1418	   | free-text-extension

1420	 # JOINING TYPE
1421	 joining-type =
1422	   "dialed-in" | "dialed-out" | "focus-owner" | free-text-extension
1423	 # DISCONNECTION TYPE
1424	 disconnection-type =
1425	   "departed" | "booted" | "failed" | "busy" | free-text-extension
1426	 # EXECUTION TYPE
1427	 execution-type =
1428	   element when { xsd:dateTime }?
1429	   & element reason { text }?
1430	   & element by { xsd:anyURI }?
1431	   & anyAttribute
1432	 # CALL TYPE
1433	 call-type =
1434	   element sip { sip-dialog-id-type }
1435	   & anyElement*
1436	   & anyAttribute
1437	 # SIP DIALOG ID TYPE
1438	 sip-dialog-id-type =
1439	   element display-text { text }?
1440	   & element call-id { text }
1441	   & element from-tag { text }
1442	   & element to-tag { text }
1443	   & anyElement*
1444	   & anyAttribute
1445	 # MEDIA TYPE
1446	 media-type =
1447	   attribute id { xsd:int }
1448	   & anyAttribute
1449	   & element display-text { text }?
1450	   & element type { text }?
1451	   & element label { text }?
1452	   & element src-id { text }?
1453	   & element status { media-status-type }?
1454	   & element xcon:to-mixer { mixer-type }?
1455	   & element xcon:from-mixer { mixer-type }?
1456	   & anyElement*
1457	 # MEDIA STATUS TYPE
1458	 media-status-type =
1459	   "recvonly"
1460	   | "sendonly"
1461	   | "sendrecv"
1462	   | "inactive"
1463	   | free-text-extension
1464	 # SIDEBARS-BY-VAL TYPE
1465	 sidebars-by-val-type =
1466	   anyAttribute
1467	   & element entry { conference-type }*
1468	   & anyElement*
1469	 # CONFERENCE TIME
1470	 conferencetime-type =
1471	   anyAttribute
1472	   & element xcon:entry {
1473	       element xcon:base { text },
1474	       element xcon:mixing-start-offset {
1475	         time-type,
1476	         attribute required-participant { single-role-type },
1477	         anyAttribute
1478	       }?,
1479	       element xcon:mixing-end-offset {
1480	         time-type,
1481	         attribute required-participant { single-role-type },
1482	         anyAttribute
1483	       }?,
1484	       element xcon:can-join-after-offset { time-type }?,
1485	       element xcon:must-join-before-offset { time-type }?,
1486	       element xcon:request-user { time-type }?,
1487	       element xcon:notify-end-of-conference { xsd:int }?,
1488	       element xcon:allowed-extend-mixing-end-offset { xsd:boolean }?,
1489	       anyElement*
1490	     }*
1491	 # TIME TYPE
1492	 time-type = xsd:dateTime { pattern = ".+T.+Z.*" }
1493	 # SINGLE ROLE TYPE
1494	 single-role-type =
1495	   xsd:string "none"
1496	   | xsd:string "administrator"
1497	   | xsd:string "moderator"
1498	   | xsd:string "user"
1499	   | xsd:string "observer"
1500	   | xsd:string "participant"
1501	   | free-text-extension
1502	 # MIXING MODE TYPE
1503	 mixing-mode-type =
1504	   xsd:string "moderator-controlled"
1505	   | xsd:string "FCFS"
1506	   | xsd:string "automatic"
1507	   | free-text-extension
1508	 # CODECS TYPE
1509	 codecs-type =
1510	   attribute decision { decision-type }
1511	   & anyAttribute
1512	   & element xcon:codec { codec-type }*
1513	   & anyElement*
1514	 # CODEC TYPE
1515	 codec-type =
1516	   attribute name { text }
1517	   & attribute policy { policy-type }
1518	   & anyAttribute
1519	   & element xcon:subtype { text }?
1520	   & anyElement*
1521	 # DECISION TYPE
1522	 decision-type =
1523	   xsd:string "automatic"
1524	   | xsd:string "moderator-controlled"
1525	   | free-text-extension
1526	 # POLICY TYPE
1527	 policy-type =
1528	   xsd:string "allowed" | xsd:string "disallowed" | free-text-extension
1529	 # CONTROL TYPE
1530	 control-type =
1531	   anyAttribute
1532	   & element xcon:mute { xsd:boolean }?
1533	   & element xcon:pause-video { xsd:boolean }?
1534	   & element xcon:gain { gain-type }?
1535	   & element xcon:video-layout { video-layout-type }?
1536	   & anyElement*
1537	 # GAIN TYPE
1538	 gain-type = xsd:int { minInclusive = "-127" maxInclusive = "127" }
1539	 # VIDEO LAYOUT TYPE
1540	 video-layout-type =
1541	   xsd:string "single-view"
1542	   | xsd:string "dual-view"
1543	   | xsd:string "dual-view-crop"
1544	   | xsd:string "dual-view-2x1"
1545	   | xsd:string "dual-view-2x1-crop"
1546	   | xsd:string "quad-view"
1547	   | xsd:string "multiple-3x3"
1548	   | xsd:string "multiple-4x4"
1549	   | xsd:string "multiple-5x1"
1550	   | xsd:string "automatic"
1551	   | free-text-extension
1552	 # FLOOR INFORMATION TYPE
1553	 floor-information-type =
1554	   anyAttribute
1555	   & element xcon:conference-ID { xsd:unsignedLong }?
1556	   & element xcon:allow-floor-events { xsd:boolean }?
1557	   & element xcon:floor-request-handling { floor-request-type }?
1558	   & element xcon:conference-floor-policy { conference-floor-policy }?
1559	   & anyElement*
1560	 # FLOOR REQUEST TYPE
1561	 floor-request-type =
1562	   xsd:string "block" | xsd:string "confirm" | free-text-extension
1563	 # CONFERENCE FLOOR POLICY
1564	 conference-floor-policy =
1565	   anyAttribute
1566	   & element xcon:floor {
1567	       attribute id { text }
1568	       & anyAttribute
1569	       & element xcon:media-label { xsd:nonNegativeInteger }+
1570	       & element xcon:algorithm { algorithm-type }?
1571	       & element xcon:max-floor-users { xsd:nonNegativeInteger }?
1572	       & element xcon:moderator-id { xsd:nonNegativeInteger }?
1573	       & anyElement*
1574	     }+
1575	 # ALGORITHM POLICY
1576	 algorithm-type =
1577	   xsd:string "moderator-controlled"
1578	   | xsd:string "FCFS"
1579	   | xsd:string "random"
1580	   | free-text-extension
1581	 # USERS ADMISSION POLICY
1582	 user-admission-policy-type =
1583	   xsd:string "closedAuthenticated"
1584	   | xsd:string "openAuthenticated"
1585	   | xsd:string "anonymous"
1586	   | free-text-extension
1587	 # JOIN HANDLING TYPE
1588	 join-handling-type =
1589	   xsd:string "block"
1590	   | xsd:string "confirm"
1591	   | xsd:string "allow"
1592	   | xsd:string "authenticate"
1593	   | xsd:string "directed-operator"
1594	   | free-text-extension
1595	 # DENY USERLIST
1596	 deny-user-list-type =
1597	   anyAttribute
1598	   & element xcon:target {
1599	       attribute uri { xsd:anyURI },
1600	       anyAttribute
1601	     }*
1602	   & anyElement*
1603	 # ALLOWED USERS LIST TYPE
1604	 allowed-users-list-type =
1605	   anyAttribute
1606	   & element xcon:target { target-type }*
1607	   & element xcon:persistent-list { persistent-list-type }?
1608	   & anyElement*
1609	 # PERSISTENT LIST TYPE
1610	 persistent-list-type =
1611	   element xcon:user {
1612	     attribute name { text }
1613	     & attribute nickname { text }
1614	     & attribute id { text }
1615	     & anyAttribute
1616	     & element xcon:e-mail { text }*
1617	     & anyElement*
1618	   }*
1619	   & anyElement*
1620	 # TARGET TYPE
1621	 target-type =
1622	   attribute uri { xsd:anyURI },
1623	   attribute method { method-type },
1624	   anyAttribute
1625	 # METHOD TYPE
1626	 method-type =
1627	   xsd:string "dial-in"
1628	   | xsd:string "dial-out"
1629	   | xsd:string "refer"
1630	   | free-text-extension
1631	 # ANONYMITY TYPE
1632	 provide-anonymity-type =
1633	   "private" | "semi-private" | "hidden" | free-text-extension
1634	 # MIXER TYPE
1635	 mixer-type =
1636	   attribute name { mixer-name-type }
1637	   & anyAttribute
1638	   & element xcon:controls { control-type }*
1639	   & anyElement*
1640	 # MIXER NAME TYPE
1641	 mixer-name-type =
1642	   "VideoIn" | "VideoOut" | "AudioOut" | "AudioIn" | free-text-extension

1644	 # FREE TEXT EXTENSION
1645	 # (re-define this as <notAllowed>,
1646	 #  if extensions beyond this spec are not used)

1648	 free-text-extension = text

1650	 # *********************************
1651	 # EXTENSIBILITY OF THE SCHEMA
1652	 # *********************************

1654	 # EXTENSIBILITY ELEMENTS
1655	 # (re-define this as <empty/>,
1656	 #  if extensions beyond this spec are not used)

1658	 anyElement =
1659	   element * - (conference-description
1660	                | host-info
1661	                | conference-state
1662	                | users
1663	                | sidebars-by-ref
1664	                | sidebars-by-val
1665	                | display-text
1666	                | subject
1667	                | free-text
1668	                | keywords
1669	                | conf-uris
1670	                | service-uris
1671	                | maximum-user-count
1672	                | available-media
1673	                | web-page
1674	                | uris
1675	                | uri
1676	                | user-count
1677	                | active
1678	                | locked
1679	                | entry
1680	                | type
1681	                | status
1682	                | purpose
1683	                | modified
1684	                | user
1685	                | associated-aors
1686	                | roles
1687	                | languages
1688	                | cascaded-focus
1689	                | endpoint
1690	                | referred
1691	                | joining-method
1692	                | joining-info
1693	                | disconnection-method
1694	                | disconnection-info
1695	                | media
1696	                | call-info
1697	                | when
1698	                | reason
1699	                | by
1700	                | sip
1701	                | call-id
1702	                | from-tag
1703	                | to-tag
1704	                | label
1705	                | src-id
1706	                | xcon:conference-password
1707	                | xcon:mixing-mode
1708	                | xcon:codecs
1709	                | xcon:controls
1710	                | xcon:language
1711	                | xcon:allow-sidebars
1712	                | xcon:allow-conference-event-subscription
1713	                | xcon:to-mixer
1714	                | xcon:provide-anonymity
1715	                | xcon:allow-refer-users-dynamically
1716	                | xcon:allow-invite-users-dynamically
1717	                | xcon:allow-remove-users-dynamically
1718	                | xcon:from-mixer
1719	                | xcon:join-handling
1720	                | xcon:user-admission-policy
1721	                | xcon:allowed-users-list
1722	                | xcon:deny-users-list
1723	                | xcon:floor-information
1724	                | xcon:conference-time
1725	                | xcon:provide-anonymity
1726	                | xcon:floor
1727	                | xcon:entry
1728	                | xcon:mixing-start-offset
1729	                | xcon:mixing-end-offset
1730	                | xcon:can-join-after-offset
1731	                | xcon:must-join-before-offset
1732	                | xcon:request-user
1733	                | xcon:notify-end-of-conference
1734	                | xcon:allowed-extend-mixing-end-offset
1735	                | xcon:codec
1736	                | xcon:subtype
1737	                | xcon:mute
1738	                | xcon:pause-video
1739	                | xcon:gain
1740	                | xcon:video-layout
1741	                | xcon:conference-ID
1742	                | xcon:allow-floor-events
1743	                | xcon:floor-request-handling
1744	                | xcon:conference-floor-policy
1745	                | xcon:media-label
1746	                | xcon:algorithm
1747	                | xcon:max-floor-users
1748	                | xcon:moderator-id
1749	                | xcon:target
1750	                | xcon:persistent-list
1751	                | xcon:e-mail
1752	                | xcon:user) { anyExtension }
1753	 anyExtension =
1754	   (attribute * { text }
1755	    | any)*

1757	 any =
1758	   element * {
1759	     (attribute * { text }
1760	      | text
1761	      | any)*
1762	   }

1764	 # EXTENSIBILITY ATTRIBUTES
1765	 # (re-define this as <empty/>,
1766	 #  if extensions beyond this spec are not used)

1768	 anyAttribute =
1769	   attribute * - (xml:lang
1770	                  | entity
1771	                  | required-participant
1772	                  | label
1773	                  | decision
1774	                  | name
1775	                  | policy
1776	                  | uri
1777	                  | method
1778	                  | id
1779	                  | nickname) { text }*

1781	6.  XML Schema Extensibility

1783	   The Conference Information Data Model defined in this document is
1784	   meant to be extensible toward specific application domains.  Such
1785	   extensions are accomplished by defining elements, child elements and
1786	   attributes that are specific to the desired application domain.  The
1787	   IETF MAY extend the data model schema with unqualified attributes or
1788	   extension elements from the "urn:ietf:params:xml:ns:" "sub-namespace"
1789	   in the future.  Other instances are free to define extension elements
1790	   or attributes under other namespaces.

1792	   Elements or attributes from unknown namespaces MUST be ignored.

1794	7.  XML Example

1796	   The following is an example of a conference information document.
1797	   The conference starts on October 17, 2007, at 10:30 AM in New York
1798	   City and finishes the same day at 12:30 PM every week.  In this
1799	   example, there are currently 3 participants in a conference, one
1800	   administrator, one moderator, and one participant.  Sidebars are
1801	   allowed in this conference and ,consequently, there is one sidebar in
1802	   the conference.  In addition, Alice and Carol are using a floor in
1803	   the main conference to manage the audio and video resources.  At the
1804	   moment, Alice is assigned to use the floor.

1806	<?xml version="1.0" encoding="UTF-8"?>
1807	<conference-info
1808	        xmlns="urn:ietf:params:xml:ns:conference-info"
1809	        xmlns:xcon="urn:ietf:params:xml:ns:xcon-conference-info"
1810	        entity="conference123@example.com">
1811	        <!--
1812	            CONFERENCE DESCRIPTION
1813	        -->
1814	        <conference-description xml:lang="en-us">
1815	            <display-text>Discussion of Formula-1 racing</display-text>
1816	            <subject>Sports:Formula-1</subject>
1817	            <free-text>This is a conference example</free-text>
1818	            <keywords>Formula-1 cars</keywords>
1819	            <!--
1820	                CONFERENCE UNIQUE IDENTIFIERS
1821	            -->
1822	            <conf-uris>
1823	                <entry>
1824	                    <uri>tel:+3585671234</uri>
1825	                    <display-text>Conference Bridge</display-text>
1826	                    <purpose>participation</purpose>
1827	                    <xcon:conference-password
1828	                     >5678</xcon:conference-password>
1829	                </entry>
1830	                <entry>
1831	                    <uri>http://www.example.com/live.ram</uri>
1832	                    <purpose>streaming</purpose>
1833	                </entry>
1834	            </conf-uris>
1835	            <!--
1836	                SERVICE URIS
1837	            -->
1838	            <service-uris>
1839	                <entry>
1840	                    <uri>mailto:bob@example.com</uri>
1841	                    <display-text>email</display-text>
1842	                </entry>
1843	            </service-uris>
1844	            <!--
1845	                MAXIMUM USER COUNT
1846	            -->
1847	            <maximum-user-count>50</maximum-user-count>
1848	            <!--
1849	                AVAILABLE MEDIA
1850	            -->
1851	            <available-media>
1852	                <entry label="10234">
1853	                    <display-text>main audio</display-text>
1854	                    <type>audio</type>
1855	                    <status>sendrecv</status>
1856	                    <xcon:mixing-mode>automatic</xcon:mixing-mode>
1857	                    <xcon:codecs decision="automatic">
1858	                        <xcon:codec name="122" policy="allowed">
1859	                           <xcon:subtype>PCMU</xcon:subtype>
1860	                        </xcon:codec>
1861	                    </xcon:codecs>
1862	                    <xcon:controls>
1863	                        <xcon:mute>true</xcon:mute>
1864	                        <xcon:gain>50</xcon:gain>
1865	                    </xcon:controls>
1866	                </entry>
1867	                <entry label="10235">
1868	                    <display-text>main video</display-text>
1869	                    <type>video</type>
1870	                    <status>sendrecv</status>
1871	                    <xcon:mixing-mode>automatic</xcon:mixing-mode>
1872	                    <xcon:codecs decision="automatic">
1873	                        <xcon:codec name="123" policy="allowed">
1874	                           <xcon:subtype>H.263</xcon:subtype>
1875	                        </xcon:codec>
1876	                    </xcon:codecs>
1877	                    <xcon:controls>
1878	                        <xcon:video-layout
1879	                          >single-view</xcon:video-layout>
1880	                    </xcon:controls>
1881	                </entry>
1882	            </available-media>

1884	            <xcon:language>En-us</xcon:language>

1886	            <xcon:allow-sidebars>true</xcon:allow-sidebars>
1887	            <!--
1888	                CONFERENCE TIME
1889	            -->

1891	            <xcon:conference-time>
1892	                <xcon:entry>
1893	                    <xcon:base>BEGIN:VCALENDAR
1894	  PRODID:-//LlamaSpinner Inc.//NONSGML CamelCall//EN
1895	  VERSION:2.0
1896	  BEGIN:VEVENT
1897	  DTSTAMP:20071003T140728Z
1898	  UID:20071003T140728Z-345FDA-carol@example.com
1899	  ORGANIZER:MAILTO:carol@example.com
1900	  DTSTART:20071017T143000Z
1901	  RRULE:FREQ=WEEKLY
1902	  DTEND:20071217T163000Z
1903	  END:VEVENT
1904	  END:VCALENDAR</xcon:base>
1905	                    <xcon:mixing-start-offset
1906	                        required-participant="moderator"
1907	                       >2007-10-17T14:29:00Z</xcon:mixing-start-offset>
1908	                    <xcon:mixing-end-offset
1909	                        required-participant="participant"
1910	                       >2007-10-17T16:31:00Z</xcon:mixing-end-offset>
1911	                    <xcon:must-join-before-offset
1912	                       >2007-10-17T15:30:00Z
1913	                       </xcon:must-join-before-offset>
1914	                </xcon:entry>
1915	            </xcon:conference-time>

1917	        </conference-description>
1918	        <!--
1919	            HOST INFO
1920	        -->
1921	        <host-info>
1922	            <display-text>Formula1</display-text>
1923	            <web-page>http://www.example.com/formula1/</web-page>
1924	            <uris>
1925	                <entry>
1926	                    <uri>sip:alice@example.com</uri>
1927	                </entry>
1928	                <entry>
1929	                    <uri>sip:carol@example.com</uri>
1930	                </entry>
1931	            </uris>
1932	        </host-info>
1933	        <!--
1934	            CONFERENCE STATE
1935	        -->
1936	        <conference-state>
1937	            <user-count>3</user-count>
1938	            <active>true</active>
1939	            <locked>false</locked>
1940	            <xcon:allow-conference-event-subscription
1941	              >true</xcon:allow-conference-event-subscription>

1943	       </conference-state>
1944	        <!--
1945	            USERS
1946	        -->
1947	        <users>
1948	            <!--
1949	                USER BOB
1950	            -->
1951	            <user entity="bob534">
1952	                <display-text>Bob Hoskins</display-text>
1953	                <associated-aors>
1954	                    <entry>
1955	                        <uri>mailto:bob@example.com</uri>
1956	                        <display-text>email</display-text>
1957	                    </entry>
1958	                </associated-aors>
1959	                <roles>
1960	                    <entry>participant</entry>
1961	                </roles>
1962	                <languages>en-us</languages>

1964	                <!--
1965	                    ENDPOINTS
1966	                -->
1967	                <endpoint entity="sip:bob@example.com">
1968	                    <display-text>Bob's Laptop</display-text>
1969	                    <referred>
1970	                        <when>2007-10-17T14:00:00Z</when>
1971	                        <reason>expert required</reason>
1972	                        <by>sip:alice@example.com</by>
1973	                    </referred>
1974	                    <status>connected</status>
1975	                    <joining-method>dialed-out</joining-method>
1976	                    <joining-info>
1977	                        <when>2007-10-17T14:00:00Z</when>
1978	                        <reason>invitation</reason>
1979	                        <by>sip:alice@example.com</by>
1980	                    </joining-info>
1981	                    <!--
1982	                        MEDIA
1983	                    -->
1984	                    <media id="1">
1985	                        <type>video</type>
1986	                        <label>10235</label>
1987	                        <src-id>432424</src-id>
1988	                        <status>sendrecv</status>
1989	                        <xcon:to-mixer name="VideoIn">
1990	                            <xcon:controls>
1991	                                <xcon:video-layout
1992	                                   >single-view</xcon:video-layout>
1993	                            </xcon:controls>
1994	                        </xcon:to-mixer>

1996	                    </media>
1997	                    <!--
1998	                        CALL INFO
1999	                    -->
2000	                    <call-info>
2001	                        <sip>
2002	                            <display-text>full info</display-text>
2003	                            <call-id>hsjh8980vhsb78</call-id>
2004	                            <from-tag>vav738dvbs</from-tag>
2005	                            <to-tag>8954jgjg8432</to-tag>
2006	                        </sip>
2007	                    </call-info>
2008	                </endpoint>
2009	                <xcon:provide-anonymity
2010	                 >semi-private</xcon:provide-anonymity>
2011	                 <xcon:allow-refer-users-dynamically
2012	                    >false</xcon:allow-refer-users-dynamically>
2013	                <xcon:allow-invite-users-dynamically
2014	                    >false</xcon:allow-invite-users-dynamically>
2015	                <xcon:allow-remove-users-dynamically
2016	                    >false</xcon:allow-remove-users-dynamically>
2017	            </user>

2019	            <!--
2020	                USER ALICE
2021	            -->
2022	            <user entity="alice334">
2023	                <display-text>Alice Kay</display-text>
2024	                <associated-aors>
2025	                    <entry>
2026	                        <uri>mailto:alice@example.com</uri>
2027	                        <display-text>email</display-text>
2028	                    </entry>
2029	                </associated-aors>
2030	                <roles>
2031	                    <entry>moderator</entry>
2032	                </roles>
2033	                <languages>en-us</languages>
2034	                <!--
2035	                    ENDPOINTS
2036	                -->
2037	                <endpoint entity="sip:alice@example.com">
2038	                    <display-text>Alice's Desktop</display-text>
2039	                    <status>connected</status>
2040	                    <joining-method>dialed-in</joining-method>
2041	                    <joining-info>
2042	                        <when>2007-10-17T13:35:08Z</when>
2043	                        <reason>invitation</reason>
2044	                        <by>sip:conference@example.com</by>
2045	                    </joining-info>
2046	                    <!--
2047	                        MEDIA
2048	                    -->
2049	                    <media id="1">
2050	                        <type>video</type>
2051	                        <label>10235</label>
2052	                        <src-id>432424</src-id>
2053	                        <status>sendrecv</status>
2054	                        <xcon:to-mixer name="VideoIn">
2055	                         <xcon:controls>
2056	                            <xcon:video-layout
2057	                              >single-view</xcon:video-layout>
2058	                         </xcon:controls>
2059	                        </xcon:to-mixer>
2060	                    </media>
2061	                    <media id="2">
2062	                        <type>audio</type>
2063	                        <label>10234</label>
2064	                        <src-id>532535</src-id>
2065	                        <status>sendrecv</status>
2066	                        <xcon:to-mixer name="VideoIn">
2067	                          <xcon:controls>
2068	                            <xcon:gain>50</xcon:gain>
2069	                          </xcon:controls>
2070	                        </xcon:to-mixer>
2071	                        <xcon:from-mixer name="VideoOut">
2072	                          <xcon:controls>
2073	                              <xcon:gain>50</xcon:gain>
2074	                          </xcon:controls>
2075	                        </xcon:from-mixer>
2076	                    </media>
2077	                    <!--
2078	                        CALL INFO
2079	                    -->
2080	                    <call-info>
2081	                        <sip>
2082	                            <display-text>full info</display-text>
2083	                            <call-id>truy45469123478</call-id>
2084	                            <from-tag>asd456cbgt</from-tag>
2085	                            <to-tag>3456jgjg1234</to-tag>
2086	                        </sip>
2087	                    </call-info>
2088	                    <xcon:floor id="345">true</xcon:floor>
2089	                </endpoint>
2090	                <xcon:provide-anonymity>private</xcon:provide-anonymity>
2091	                <xcon:allow-refer-users-dynamically
2092	                    >true</xcon:allow-refer-users-dynamically>
2093	                <xcon:allow-invite-users-dynamically
2094	                    >true</xcon:allow-invite-users-dynamically>
2095	                <xcon:allow-remove-users-dynamically
2096	                    >true</xcon:allow-remove-users-dynamically>
2097	            </user>

2099	            <!--
2100	                USER CAROL
2101	            -->
2102	            <user entity="carol233">
2103	                <display-text>Carol More</display-text>
2104	                <associated-aors>
2105	                    <entry>
2106	                        <uri>mailto:carol@example.com</uri>
2107	                        <display-text>email</display-text>
2108	                    </entry>
2109	                </associated-aors>
2110	                <roles>
2111	                    <entry>administrator</entry>
2112	                </roles>
2113	                <languages>en-us</languages>
2114	                <!--
2115	                    ENDPOINTS
2116	                -->
2117	                <endpoint entity="sip:carol@example.com">
2118	                    <display-text>Carol's Computer</display-text>
2119	                    <status>connected</status>
2120	                    <joining-method>dialed-in</joining-method>
2121	                    <joining-info>
2122	                        <when>2007-10-17T13:30:05Z</when>
2123	                        <reason>invitation</reason>
2124	                        <by>sip:conference@example.com</by>
2125	                    </joining-info>
2126	                    <!--
2127	                        MEDIA
2128	                    -->
2129	                    <media id="1">
2130	                        <type>video</type>
2131	                        <label>10235</label>
2132	                        <src-id>432424</src-id>
2133	                        <status>sendrecv</status>
2134	                        <xcon:to-mixer name="VideoIn">
2135	                            <xcon:controls>
2136	                                <xcon:video-layout
2137	                              >single-view</xcon:video-layout>
2138	                         </xcon:controls>
2139	                        </xcon:to-mixer>

2141	                    </media>
2142	                    <media id="2">
2143	                        <type>audio</type>
2144	                        <label>10234</label>
2145	                        <src-id>532535</src-id>
2146	                        <status>sendrecv</status>
2147	                        <xcon:to-mixer name="VideoIn">
2148	                            <xcon:controls>
2149	                                <xcon:gain>50</xcon:gain>
2150	                            </xcon:controls>
2151	                        </xcon:to-mixer>
2152	                        <xcon:from-mixer name="VideoOut">
2153	                            <xcon:controls>
2154	                                <xcon:gain>50</xcon:gain>
2155	                          </xcon:controls>
2156	                        </xcon:from-mixer>
2157	                    </media>
2158	                    <!--
2159	                        CALL INFO
2160	                    -->
2161	                    <call-info>
2162	                        <sip>
2163	                            <display-text>full info</display-text>
2164	                            <call-id>wevb12562321894</call-id>
2165	                            <from-tag>asw456wedf</from-tag>
2166	                            <to-tag>2365dfrt3497</to-tag>
2167	                        </sip>
2168	                    </call-info>

2170	                    <xcon:floor id="345">false</xcon:floor>
2171	                </endpoint>

2173	                <xcon:provide-anonymity>private</xcon:provide-anonymity>
2174	                <xcon:allow-refer-users-dynamically
2175	                    >true</xcon:allow-refer-users-dynamically>
2176	                <xcon:allow-invite-users-dynamically
2177	                    >true</xcon:allow-invite-users-dynamically>
2178	                <xcon:allow-remove-users-dynamically
2179	                    >true</xcon:allow-remove-users-dynamically>

2181	            </user>

2183	            <xcon:join-handling>allow</xcon:join-handling>
2184	            <xcon:user-admission-policy
2185	               >openAuthenticated</xcon:user-admission-policy>
2186	            <!--
2187	                ALLOWED USERS LIST
2188	            -->
2189	            <xcon:allowed-users-list>
2190	                <xcon:target uri="sip:bob@example.com"
2191	                    method="dial-out"/>
2192	                <xcon:target uri="sip:alice@example.com"
2193	                    method="dial-out"/>
2194	                <xcon:target uri="sip:carol@example.com"
2195	                    method="dial-out"/>
2196	                <xcon:target uri="sip:john@example.com"
2197	                    method="refer"/>
2198	            </xcon:allowed-users-list>
2199	            <!--
2200	                DENY USERS LIST
2201	            -->
2202	            <xcon:deny-users-list>
2203	                <xcon:target uri="sip:charlie@example.com"/>
2204	            </xcon:deny-users-list>
2205	        </users>
2206	        <!--
2207	            SIDEBARS BY REFERENCE
2208	        -->
2209	        <sidebars-by-ref>
2210	            <entry>
2211	                <uri>conf223</uri>
2212	                <display-text>private with Bob</display-text>
2213	            </entry>
2214	        </sidebars-by-ref>
2215	        <!--
2216	            SIDEBARS BY VALUE
2217	        -->
2218	        <sidebars-by-val>
2219	            <entry entity="conf223">
2220	                <users>
2221	                    <user entity="bob534"/>
2222	                    <user entity="carol233"/>
2223	                </users>
2224	            </entry>
2225	        </sidebars-by-val>
2226	        <!--
2227	            FLOOR INFORMATION
2228	        -->
2229	        <xcon:floor-information>
2230	            <xcon:conference-ID>567</xcon:conference-ID>
2231	            <xcon:allow-floor-events>true</xcon:allow-floor-events>
2232	            <xcon:floor-request-handling
2233	             >confirm</xcon:floor-request-handling>

2235	            <xcon:conference-floor-policy>
2236	                <xcon:floor id="345">
2237	                    <xcon:media-label>10234</xcon:media-label>
2238	                    <xcon:media-label>10235</xcon:media-label>
2239	                    <xcon:algorithm
2240	                     >moderator-controlled</xcon:algorithm>
2241	                    <xcon:max-floor-users>1</xcon:max-floor-users>
2242	                    <xcon:moderator-id>234</xcon:moderator-id>
2243	                </xcon:floor>
2244	            </xcon:conference-floor-policy>
2245	        </xcon:floor-information>

2247	    </conference-info>

2249	   Note that due to RFC formatting conventions, this documents splits
2250	   lines whose content would exceed 72 characters.  Two backslash
2251	   characters mark where line folding has taken place.  These
2252	   backslashes would not appear in the actual XML data model.

2254	8.  Security Considerations

2256	   There are numerous security considerations for this document.  This
2257	   section considers them.

2259	8.1.  Authentication

2261	   Different conferencing protocols will support different types of
2262	   authentication mechanisms.  Since a variety of signaling protocols
2263	   are possible, a variety of authentication mechanism may need to be
2264	   mapped from the different protocols.

2266	   Futhermore, users may use different namespaces to access to a
2267	   conference.  So a mapping database has to specify the acceptable
2268	   range of namespace for a user.  Doing so, a users will not access the
2269	   same conference twice using a different namespace.

2271	   The security considerations for authentication (section 10.1)
2272	   described in the centralized conferencing framework [RFC4575] applies
2273	   to this document.  The focus must ensure that only authorized
2274	   entities are able to manipulate the data to access the information.

2276	8.2.  Confidentiality

2278	   Participants of a conference may not want to reveal some private
2279	   information to other users.  The Conference Information Data Model
2280	   contains sensitive data which should not be analyzed or given to
2281	   anyone.  Confidentiality is provided through encryption.  Strong end-
2282	   to-end authentication and encryption can be done using public keys,
2283	   and end-to-end encryption can be done using private keys.  It is
2284	   RECOMMENDED that the protocols that manipulated the conference
2285	   information data model use a strong encryption for conference
2286	   information protection.

2288	8.3.  Integrity

2290	   A conferencing system may maintain a mapping database between the
2291	   conference object identifiers and the identifiers associated with
2292	   each of the complementary centralized conferencing protocols, as well
2293	   as, a mapping between the conference user identifiers and the
2294	   identifiers associated with each user in a conference.  This mapping
2295	   database contains sensitive data.  It is RECOMMENDED that the mapping
2296	   database has integrity when it is established, the integrity has to
2297	   be protected, and the database has to be maintained to ensure changes
2298	   in namespaces are accurately reflected.

2300	9.  IANA Considerations

2302	9.1.  Relax NG Schema Registration

2304	  This specification registers a schema. The schema can be found
2305	  as the sole content of Section 5.

2307	     URI:  urn:ietf:params:xml:ns:xcon-conference-info

2309	     Registrant Contact: IETF XCON working group,
2310	        <xcon@ietf.org>, Oscar Novo
2311	        <Oscar.Novo@ericsson.com>

2313	     Relax NG Schema:  The Relax NG schema to be registered is contained
2314	        in Section 5.  Its first line is

2316	     namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"

2318	        and its last line is

2320	     disconnection-type = "departed" | "booted" | "failed" | "busy"

2322	9.2.  XML Namespace Registration
2323	   This section registers a new XML namespace.

2325	      URI:  urn:ietf:params:xml:ns:xcon-conference-info

2327	      Registrant Contact: IETF XCON working group,
2328	         <xcon@ietf.org>, Oscar Novo
2329	         <Oscar.Novo@ericsson.com>

2331	       XML:

2333	         BEGIN
2334	         <?xml version="1.0"?>
2335	         <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
2336	           "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
2337	         <html xmlns="http://www.w3.org/1999/xhtml">
2338	         <head>
2339	           <meta http-equiv="content-type"
2340	                 content="text/html;charset=iso-8859-1"/>
2341	           <title> Centralized Conferencing Namespace</title>
2342	         </head>
2343	         <body>
2344	           <h1>Namespace for Centralized Conferencing</h1>
2345	           <h2>urn:ietf:params:xml:ns:xcon-conference-info</h2>
2346	         <p>See <a href="[URL of published RFC]">RFCXXXX
2347	             [NOTE TO IANA/RFC-EDITOR:
2348	              Please replace XXXX with the RFC number of this
2349	             specification.]</a>.</p>
2350	         </body>
2351	         </html>
2352	         END

2354	9.3.  Conference Object Identifier Registration

2356	 The IANA is requested to register the following URI scheme
2357	 under the Permanent URI Schemes register.

2359	 XCON-URI = "xcon" ":" [conf-object-id "@"] host [ ":" port ] [RFC xxxx]

2361	  conf-object-id = 1*( unreserved / "+" / "=" / "/" )

2363	   host, port, and unreserved are defined in RFC3986[RFC3986]

2365	   [Note to the RFC Editor: replace xxxx with the number this RFC gets
2366	   assigned.]
2367	    Subject: Request for XCON-URI Registration
2368	    Person & email address to contact for further information:
2369	         Oscar Novo <oscar novo_at_ericsson.com>
2370	    Specification: RFC XXXX
2371	    Author/Change Controller: IESG
2372	    Comments:
2373	        Identifies the Conference

2375	9.4.  Conference User Identifier Registration

2377	   The IANA is requested to register the following URI scheme
2378	    under the Permanent URI Schemes register.

2380	    XCON-USERID = "xcon-userid" ":" conf-user-id  [ RFC xxxx ]

2382	    conf-user-id = 1*(unreserved)

2384	   unreserved is defined in RFC3986[RFC3986]

2386	   [Note to the RFC Editor: replace xxxx with the number this RFC gets
2387	   assigned.]

2389	    Subject: Request for XCON-USERID Registration
2390	    Person & email address to contact for further information:
2391	         Oscar Novo <oscar novo_at_ericsson.com>
2392	    Specification: RFC XXXX
2393	    Author/Change Controller: IESG
2394	    Comments:
2395	        Identifies the User in the conference

2397	10.  Acknowledgements

2399	   This document is really a distillation of many ideas discussed over a
2400	   long period of time.  These ideas were contributed by many different
2401	   drafts in the XCON working group and the SIPPING working group.  We
2402	   would like to thank Orit Levin, Adam Roach, Mary Barnes, Chris
2403	   Boulton, Umesh Chandra, Hisham Khartabil, Petri Koskelainen, Aki
2404	   Niemi, Rohan Mahy, Jonathan Lennox, and Henning Schulzrinne for their
2405	   comments.  Also, we would like to thank Mary Barnes, and Chris
2406	   Boulton for letting us use the conference and user identifier
2407	   information of their xcon drafts.  Last but not least, we would like
2408	   to express our gratitude to all those reviewers for their invaluable
2409	   contribution: Simon Pietro Romano, Lorenzo Miniero, Tobia Castaldi,
2410	   Miguel Garcia, Mary Barnes, Srivatsa Srinivasan, Avshalom Houri,
2411	   Pierre Tane, and Ben Campbell.

2413	11.  References

2415	11.1.  Normative References

2417	   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
2418	              Requirement Levels", BCP 14, RFC 2119, March 1997.

2420	   [RFC2445]  Dawson, F. and Stenerson, D., "Internet Calendaring and
2421	              Scheduling Core Object Specification (iCalendar)",
2422	              RFC 2445, November 1998.

2424	   [RFC4575]  Rosenberg, J., Schulzrinne, H., and O. Levin, "A Session
2425	              Initiation Protocol (SIP) Event Package for Conference
2426	              State", RFC 4575, August 2006.

2428	   [RFC4582]  Camarillo, G., Ott, J., and K. Drage, "The Binary Floor
2429	              Control Protocol (BFCP)", RFC 4582, November 2006.

2431	   [RFC4583]  Camarillo, G., "Session Description Protocol (SDP) Format
2432	              for Binary Floor Control Protocol (BFCP) Streams",
2433	              RFC 4583, November 2006.

2435	   [RFC5239]  Barnes, M., Boulton, C., and O. Levin, "A Framework for
2436	              Centralized Conferencing", RFC 5239, June 2008.

2438	11.2.  Informative References

2440	   [IANA]     "IANA registry for RTP Payload Types"
2441	              "http://www.iana.org/assignments/rtp-parameters".

2443	   [RELAX]    "RELAX NG Home Page" "http://relaxng.org/".

2445	   [RFC3264]  Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model
2446	              with Session Description Protocol (SDP)", RFC 3264,
2447	              June 2002.

2449	   [RFC3265]  Roach, A., "Session Initiation Protocol (SIP)-Specific
2450	              Event Notification", RFC 3265, June 2002.

2452	   [RFC3986]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
2453	              Resource Identifier (URI): Generic Syntax", STD 66,
2454	              RFC 3986, January 2005.

2456	   [RFC4353]  Rosenberg, J., "A Framework for Conferencing with the
2457	              Session Initiation Protocol (SIP)", RFC 4353,
2458	              February 2006.

2460	   [RFC4855]  Casner, S., "Media Type Registration of RTP Payload
2461	              Formats", RFC 4855, February 2007.

2463	   [RFC5018]  Camarillo, G., "Connection Establishment in the Binary
2464	              Floor Control Protocol (BFCP)", RFC 5018, September 2007.

2466	   [W3C.REC-xml-20001006]
2467	              Bray, T., Paoli, J., Sperberg-McQueen, C., and E. Maler,
2468	              "Extensible Markup Language (XML) 1.0 (Second Edition)",
2469	              World Wide Web Consortium FirstEdition REC-xml-20001006,
2470	              October 2000,
2471	              <http://www.w3.org/TR/2000/REC-xml-20001006>.

2473	Appendix A.  Non-Normative RELAX NG Schema in XML Syntax

2475	 <?xml version="1.0" encoding="UTF-8" ?>
2476	    <grammar
2477	           ns="urn:ietf:params:xml:ns:conference-info"
2478	           xmlns="http://relaxng.org/ns/structure/1.0"
2479	           xmlns:xcon="urn:ietf:params:xml:ns:xcon-conference-info"
2480	           datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
2481	           <start>
2482	            <element name="conference-info">
2483	             <ref name="conference-type"/>
2484	            </element>
2485	           </start>
2486	           <!--
2487	               CONFERENCE TYPE
2488	           -->
2489	           <define name="conference-type">
2490	            <interleave>
2491	            <attribute name="entity">
2492	             <text/>
2493	            </attribute>
2494	            <ref name="anyAttribute"/>
2495	            <optional>
2496	             <ref name="conference-description-type"/>
2497	            </optional>
2498	            <optional>
2499	             <element name="host-info">
2500	              <ref name="host-type"/>
2501	             </element>
2502	            </optional>
2503	            <optional>
2504	             <element name="conference-state">
2505	              <ref name="conference-state-type"/>
2506	             </element>
2507	            </optional>
2508	            <optional>
2509	             <element name="users">
2510	              <ref name="users-type"/>
2511	             </element>
2512	            </optional>
2513	            <optional>
2514	             <element name="sidebars-by-ref">
2515	              <ref name="uris-type"/>
2516	             </element>
2517	            </optional>
2518	            <optional>
2519	             <element name="sidebars-by-val">
2520	              <ref name="sidebars-by-val-type"/>
2521	             </element>
2522	            </optional>
2523	            <optional>
2524	             <element name="xcon:floor-information">
2525	              <ref name="floor-information-type"/>
2526	             </element>
2527	            </optional>
2528	            <zeroOrMore>
2529	             <ref name="anyElement"/>
2530	            </zeroOrMore>
2531	            </interleave>
2532	           </define>
2533	           <!--
2534	               CONFERENCE DESCRIPTION TYPE
2535	           -->
2536	           <define name="conference-description-type">
2537	            <element name="conference-description">
2538	             <interleave>
2539	             <optional>
2540	              <attribute name="xml:lang">
2541	               <data type="language"/>
2542	              </attribute>
2543	             </optional>
2544	             <ref name="anyAttribute"/>
2545	             <optional>
2546	              <element name="display-text">
2547	               <text/>
2548	              </element>
2549	             </optional>
2550	             <optional>
2551	              <element name="subject">
2552	               <text/>
2553	              </element>
2554	             </optional>
2555	             <optional>
2556	              <element name="free-text">
2557	               <text/>
2558	              </element>
2559	             </optional>
2560	             <optional>
2561	              <element name="keywords">
2562	               <list>
2563	                <zeroOrMore>
2564	                 <data type="string"/>
2565	                </zeroOrMore>
2566	               </list>
2567	              </element>
2568	             </optional>
2569	             <optional>
2570	              <element name="conf-uris">
2571	               <ref name="uris-type"/>
2572	              </element>
2573	             </optional>
2574	             <optional>
2575	              <element name="service-uris">
2576	                 <ref name="uris-type"/>
2577	              </element>
2578	             </optional>
2579	             <optional>
2580	              <element name="maximum-user-count">
2581	               <data type="int"/>
2582	              </element>
2583	             </optional>
2584	             <optional>
2585	              <element name="available-media">
2586	               <ref name="conference-media-type"/>
2587	              </element>
2588	             </optional>
2589	             <optional>
2590	              <element name="xcon:language">
2591	               <data type="language"/>
2592	              </element>
2593	             </optional>
2594	             <optional>
2595	              <element name="xcon:allow-sidebars">
2596	               <data type="boolean"/>
2597	              </element>
2598	             </optional>
2599	             <optional>
2600	              <element name="xcon:conference-time">
2601	               <ref name="conferencetime-type"/>
2602	              </element>
2603	             </optional>
2604	             <zeroOrMore>
2605	              <ref name="anyElement"/>
2606	             </zeroOrMore>
2607	             </interleave>
2608	            </element>
2609	           </define>
2610	           <!--
2611	               HOST TYPE
2612	           -->
2613	           <define name="host-type">
2614	            <interleave>
2615	            <optional>
2616	             <element name="display-text">
2617	              <text/>
2618	             </element>
2619	            </optional>
2620	            <optional>
2621	             <element name="web-page">
2622	              <data type="anyURI"/>
2623	             </element>
2624	            </optional>
2625	            <optional>
2626	             <element name="uris">
2627	              <ref name="uris-type"/>
2628	             </element>
2629	            </optional>
2630	            <zeroOrMore>
2631	             <ref name="anyElement"/>
2632	            </zeroOrMore>
2633	            <ref name="anyAttribute"/>
2634	            </interleave>
2635	           </define>
2636	           <!--
2637	               CONFERENCE STATE TYPE
2638	           -->
2639	           <define name="conference-state-type">
2640	            <interleave>
2641	            <ref name="anyAttribute"/>
2642	            <optional>
2643	             <element name="user-count">
2644	              <data type="unsignedInt"/>
2645	             </element>
2646	            </optional>
2647	            <optional>
2648	             <element name="active">
2649	              <data type="boolean"/>
2650	             </element>
2651	            </optional>
2652	            <optional>
2653	             <element name="locked">
2654	              <data type="boolean"/>
2655	             </element>
2656	            </optional>
2657	            <optional>
2658	             <element name="xcon:allow-conference-event-subscription">
2659	              <data type="boolean"/>
2660	             </element>
2661	            </optional>
2662	            <zeroOrMore>
2663	             <ref name="anyElement"/>
2664	            </zeroOrMore>
2665	            </interleave>
2666	           </define>
2667	           <!--
2668	               CONFERENCE MEDIA TYPE
2669	           -->
2670	           <define name="conference-media-type">
2671	            <interleave>
2672	            <ref name="anyAttribute"/>
2673	            <zeroOrMore>
2674	             <element name="entry">
2675	              <ref name="conference-medium-type"/>
2676	             </element>
2677	            </zeroOrMore>
2678	            <zeroOrMore>
2679	             <ref name="anyElement"/>
2680	            </zeroOrMore>
2681	            </interleave>
2682	           </define>
2683	           <!--
2684	               CONFERENCE MEDIUM TYPE
2685	           -->
2686	           <define name="conference-medium-type">
2687	            <interleave>
2688	            <attribute name="label">
2689	             <text/>
2690	            </attribute>
2691	            <ref name="anyAttribute"/>
2692	            <optional>
2693	             <element name="display-text">
2694	              <text/>

2696	             </element>
2697	            </optional>
2698	            <optional>
2699	             <element name="type">
2700	              <text/>
2701	             </element>
2702	            </optional>
2703	            <optional>
2704	             <element name="status">
2705	              <ref name="media-status-type"/>
2706	             </element>
2707	            </optional>
2708	            <optional>
2709	             <element name="xcon:mixing-mode">
2710	              <ref name="mixing-mode-type"/>
2711	             </element>
2712	            </optional>
2713	            <optional>
2714	             <element name="xcon:codecs">
2715	              <ref name="codecs-type"/>
2716	             </element>
2717	            </optional>
2718	            <optional>
2719	             <element name="xcon:controls">
2720	              <ref name="control-type"/>
2721	             </element>
2722	            </optional>
2723	            <zeroOrMore>
2724	             <ref name="anyElement"/>
2725	            </zeroOrMore>
2726	            </interleave>
2727	           </define>
2728	           <!--
2729	               URIs TYPE
2730	           -->
2731	           <define name="uris-type">
2732	            <interleave>
2733	            <ref name="anyAttribute"/>
2734	            <zeroOrMore>
2735	             <element name="entry">
2736	              <ref name="uri-type"/>
2737	             </element>
2738	            </zeroOrMore>
2739	            <zeroOrMore>
2740	             <ref name="anyElement"/>
2741	            </zeroOrMore>
2742	            </interleave>
2743	           </define>
2744	           <!--
2745	               URI TYPE
2746	           -->
2747	           <define name="uri-type">
2748	            <interleave>
2749	            <element name="uri">
2750	             <data type="anyURI"/>
2751	            </element>
2752	            <optional>
2753	             <element name="display-text">
2754	              <text/>
2755	             </element>
2756	            </optional>
2757	            <optional>
2758	             <element name="purpose">
2759	              <text/>
2760	             </element>
2761	            </optional>
2762	            <optional>
2763	             <element name="modified">
2764	              <ref name="execution-type"/>
2765	             </element>
2766	            </optional>
2767	            <optional>
2768	             <element name="xcon:conference-password">
2769	              <text/>
2770	             </element>
2771	            </optional>
2772	            <zeroOrMore>
2773	             <ref name="anyElement"/>
2774	            </zeroOrMore>
2775	            <ref name="anyAttribute"/>
2776	           </interleave>

2778	           </define>
2779	           <!--
2780	               USERS TYPE
2781	           -->
2782	           <define name="users-type">
2783	            <interleave>
2784	            <ref name="anyAttribute"/>
2785	            <zeroOrMore>
2786	             <element name="user">
2787	              <ref name="user-type"/>
2788	             </element>
2789	            </zeroOrMore>
2790	            <optional>
2791	             <element name="xcon:join-handling">
2792	              <ref name="join-handling-type"/>
2793	             </element>
2794	            </optional>
2795	            <optional>
2796	             <element name="xcon:user-admission-policy">
2797	              <ref name="user-admission-policy-type"/>
2798	             </element>
2799	            </optional>
2800	            <optional>
2801	             <element name="xcon:allowed-users-list">
2802	              <ref name="allowed-users-list-type"/>
2803	             </element>
2804	            </optional>
2805	            <optional>
2806	             <element name="xcon:deny-users-list">
2807	              <ref name="deny-user-list-type"/>
2808	             </element>
2809	            </optional>
2810	            <zeroOrMore>
2811	             <ref name="anyElement"/>
2812	            </zeroOrMore>
2813	            </interleave>
2814	           </define>
2815	           <!--
2816	               USER TYPE
2817	           -->
2818	           <define name="user-type">
2819	            <interleave>
2820	            <attribute name="entity">
2821	             <data type="anyURI"/>
2822	            </attribute>
2823	            <ref name="anyAttribute"/>
2824	            <optional>
2825	             <element name="display-text">
2826	              <text/>
2827	             </element>
2828	            </optional>
2829	            <optional>
2830	             <element name="associated-aors">
2831	               <ref name="uris-type"/>
2832	             </element>
2833	            </optional>
2834	            <optional>
2835	             <element name="roles">
2836	              <oneOrMore>
2837	               <element name="entry">
2838	                <ref name="single-role-type"/>
2839	               </element>

2841	              </oneOrMore>
2842	             </element>
2843	            </optional>
2844	            <optional>
2845	             <element name="languages">
2846	              <list>
2847	               <data type="language"/>
2848	              </list>
2849	             </element>
2850	            </optional>
2851	            <optional>
2852	             <element name="cascaded-focus">
2853	              <data type="anyURI"/>
2854	             </element>
2855	            </optional>
2856	            <zeroOrMore>
2857	             <element name="endpoint">
2858	              <ref name="endpoint-type"/>
2859	             </element>
2860	            </zeroOrMore>
2861	            <optional>
2862	             <element name="xcon:provide-anonymity">
2863	              <ref name="provide-anonymity-type"/>
2864	             </element>
2865	            </optional>
2866	           <optional>
2867	             <element name="xcon:allow-refer-users-dynamically">
2868	              <data type="boolean"/>
2869	             </element>
2870	            </optional>
2871	            <optional>
2872	             <element name="xcon:allow-invite-users-dynamically">
2873	              <data type="boolean"/>
2874	             </element>
2875	            </optional>
2876	            <optional>
2877	             <element name="xcon:allow-remove-users-dynamically">
2878	              <data type="boolean"/>
2879	             </element>
2880	            </optional>
2881	             <zeroOrMore>
2882	             <ref name="anyElement"/>
2883	            </zeroOrMore>
2884	            </interleave>
2885	           </define>
2886	           <!--
2887	               ENDPOINT TYPE
2888	           -->
2889	           <define name="endpoint-type">
2890	            <interleave>
2891	            <attribute name="entity">
2892	             <text/>
2893	            </attribute>
2894	            <ref name="anyAttribute"/>
2895	            <optional>
2896	             <element name="display-text">
2897	              <text/>
2898	             </element>
2899	            </optional>
2900	            <optional>
2901	             <element name="referred">
2902	               <ref name="execution-type"/>
2903	             </element>
2904	            </optional>
2905	            <optional>
2906	             <element name="status">
2907	              <ref name="endpoint-status-type"/>
2908	             </element>
2909	            </optional>
2910	            <optional>
2911	             <element name="joining-method">
2912	              <ref name="joining-type"/>
2913	             </element>
2914	            </optional>
2915	            <optional>
2916	             <element name="joining-info">
2917	               <ref name="execution-type"/>
2918	             </element>
2919	            </optional>
2920	            <optional>
2921	             <element name="disconnection-method">
2922	              <ref name="disconnection-type"/>
2923	             </element>
2924	            </optional>
2925	            <optional>
2926	             <element name="disconnection-info">
2927	              <ref name="execution-type"/>
2928	             </element>
2929	            </optional>
2930	            <zeroOrMore>
2931	             <element name="media">
2932	              <ref name="media-type"/>
2933	             </element>
2934	            </zeroOrMore>
2935	            <optional>
2936	             <element name="call-info">
2937	              <ref name="call-type"/>
2938	             </element>
2939	            </optional>
2940	            <zeroOrMore>
2941	             <element name="xcon:floor">
2942	              <attribute name="id">
2943	               <text/>
2944	              </attribute>
2945	              <ref name="anyAttribute"/>
2946	              <data type="boolean"/>
2947	             </element>
2948	            </zeroOrMore>
2949	            <zeroOrMore>
2950	             <ref name="anyElement"/>
2951	            </zeroOrMore>
2952	            </interleave>
2953	           </define>
2954	           <!--
2955	               ENDPOINT STATUS TYPE
2956	           -->
2957	           <define name="endpoint-status-type">
2958	            <choice>
2959	             <value>pending</value>
2960	             <value>dialing-out</value>
2961	             <value>dialing-in</value>
2962	             <value>alerting</value>
2963	             <value>on-hold</value>
2964	             <value>connected</value>
2965	             <value>muted-via-focus</value>
2966	             <value>disconnecting</value>
2967	             <value>disconnected</value>
2968	             <ref name="free-text-extension"/>
2969	            </choice>
2970	           </define>
2971	           <!--
2972	               JOINING TYPE
2973	           -->
2974	           <define name="joining-type">
2975	            <choice>
2976	             <value>dialed-in</value>
2977	             <value>dialed-out</value>
2978	             <value>focus-owner</value>
2979	             <ref name="free-text-extension"/>
2980	            </choice>
2981	           </define>
2982	           <!--
2983	               DISCONNECTION TYPE
2984	           -->
2985	           <define name="disconnection-type">
2986	            <choice>
2987	             <value>departed</value>
2988	             <value>booted</value>
2989	             <value>failed</value>
2990	             <value>busy</value>
2991	             <ref name="free-text-extension"/>
2992	            </choice>
2993	           </define>
2994	           <!--
2995	               EXECUTION TYPE
2996	           -->
2997	           <define name="execution-type">
2998	            <interleave>
2999	            <optional>
3000	             <element name="when">
3001	              <data type="dateTime"/>
3002	             </element>
3003	            </optional>
3004	            <optional>
3005	             <element name="reason">
3006	              <text/>
3007	             </element>
3008	            </optional>
3009	            <optional>
3010	             <element name="by">
3011	              <data type="anyURI"/>
3012	             </element>
3013	            </optional>
3014	            <ref name="anyAttribute"/>
3015	            </interleave>
3016	           </define>
3017	           <!--
3018	               CALL TYPE
3019	           -->
3020	           <define name="call-type">
3021	            <interleave>
3022	             <element name="sip">
3023	              <ref name="sip-dialog-id-type"/>
3024	             </element>
3025	             <zeroOrMore>
3026	              <ref name="anyElement"/>
3027	             </zeroOrMore>
3028	             <ref name="anyAttribute"/>
3029	            </interleave>
3030	           </define>
3031	           <!--
3032	               SIP DIALOG ID TYPE

3034	           -->
3035	           <define name="sip-dialog-id-type">
3036	            <interleave>
3037	            <optional>
3038	            <element name="display-text">
3039	             <text/>
3040	            </element>
3041	            </optional>
3042	            <element name="call-id">
3043	             <text/>
3044	            </element>
3045	            <element name="from-tag">
3046	             <text/>
3047	            </element>
3048	            <element name="to-tag">
3049	             <text/>
3050	            </element>
3051	            <zeroOrMore>
3052	             <ref name="anyElement"/>
3053	            </zeroOrMore>
3054	            <ref name="anyAttribute"/>
3055	            </interleave>
3056	           </define>
3057	           <!--
3058	               MEDIA TYPE
3059	           -->
3060	           <define name="media-type">
3061	            <interleave>
3062	            <attribute name="id">
3063	             <data type="int"/>
3064	            </attribute>
3065	            <ref name="anyAttribute"/>
3066	            <optional>
3067	             <element name="display-text">
3068	              <text/>
3069	             </element>
3070	            </optional>
3071	            <optional>
3072	             <element name="type">
3073	              <text/>
3074	             </element>
3075	            </optional>
3076	            <optional>
3077	             <element name="label">
3078	              <text/>
3079	             </element>
3080	            </optional>
3081	            <optional>
3082	             <element name="src-id">
3083	              <text/>
3084	             </element>
3085	            </optional>
3086	            <optional>
3087	             <element name="status">
3088	              <ref name="media-status-type"/>
3089	             </element>
3090	            </optional>
3091	            <optional>
3092	             <element name="xcon:to-mixer">
3093	              <ref name="mixer-type"/>
3094	             </element>
3095	            </optional>
3096	            <optional>
3097	             <element name="xcon:from-mixer">
3098	              <ref name="mixer-type"/>
3099	             </element>
3100	            </optional>
3101	            <zeroOrMore>
3102	             <ref name="anyElement"/>
3103	            </zeroOrMore>
3104	            </interleave>
3105	           </define>
3106	           <!--
3107	               MEDIA STATUS TYPE
3108	           -->
3109	           <define name="media-status-type">
3110	            <choice>
3111	             <value>recvonly</value>
3112	             <value>sendonly</value>
3113	             <value>sendrecv</value>
3114	             <value>inactive</value>
3115	             <ref name="free-text-extension"/>
3116	            </choice>
3117	           </define>
3118	           <!--
3119	               SIDEBARS-BY-VAL TYPE
3120	           -->
3121	           <define name="sidebars-by-val-type">
3122	            <interleave>
3123	            <ref name="anyAttribute"/>
3124	            <zeroOrMore>
3125	             <element name="entry">
3126	              <ref name="conference-type"/>
3127	             </element>
3128	            </zeroOrMore>
3129	            <zeroOrMore>
3130	             <ref name="anyElement"/>
3131	            </zeroOrMore>
3132	            </interleave>
3133	           </define>
3134	           <!--
3135	               CONFERENCE TIME
3136	           -->
3137	           <define name="conferencetime-type">
3138	            <interleave>
3139	            <ref name="anyAttribute"/>
3140	            <zeroOrMore>
3141	             <element name="xcon:entry">
3142	              <element name="xcon:base">
3143	               <text/>
3144	              </element>
3145	              <optional>
3146	               <element name="xcon:mixing-start-offset">
3147	                 <ref name="time-type"/>
3148	                 <attribute name="required-participant">
3149	                  <ref name="single-role-type"/>
3150	                 </attribute>
3151	                <ref name="anyAttribute"/>
3152	               </element>
3153	              </optional>
3154	              <optional>
3155	               <element name="xcon:mixing-end-offset">
3156	                <ref name="time-type"/>
3157	                <attribute name="required-participant">
3158	                 <ref name="single-role-type"/>
3159	                </attribute>
3160	                <ref name="anyAttribute"/>
3161	               </element>
3162	              </optional>
3163	              <optional>
3164	               <element name="xcon:can-join-after-offset">
3165	                <ref name="time-type"/>
3166	               </element>
3167	              </optional>
3168	              <optional>
3169	               <element name="xcon:must-join-before-offset">
3170	                <ref name="time-type"/>
3171	               </element>
3172	              </optional>
3173	              <optional>
3174	               <element name="xcon:request-user">
3175	                <ref name="time-type"/>
3176	               </element>
3177	              </optional>
3178	              <optional>
3179	               <element name="xcon:notify-end-of-conference">
3180	                <data type="int"/>
3181	               </element>
3182	              </optional>
3183	              <optional>
3184	               <element name="xcon:allowed-extend-mixing-end-offset">
3185	                <data type="boolean"/>
3186	               </element>
3187	              </optional>
3188	              <zeroOrMore>
3189	               <ref name="anyElement"/>
3190	              </zeroOrMore>
3191	             </element>
3192	            </zeroOrMore>
3193	            </interleave>
3194	           </define>
3195	           <!--
3196	               TIME TYPE
3197	           -->
3198	           <define name="time-type">
3199	             <data type="dateTime">
3200	               <param name="pattern">.+T.+Z.*</param>
3201	             </data>
3202	           </define>
3203	           <!--
3204	               SINGLE ROLE TYPE
3205	           -->
3206	           <define name="single-role-type">
3207	            <choice>
3208	             <value type="string">none</value>
3209	             <value type="string">administrator</value>
3210	             <value type="string">moderator</value>
3211	             <value type="string">user</value>
3212	             <value type="string">observer</value>
3213	             <value type="string">participant</value>
3214	             <ref name="free-text-extension"/>
3215	            </choice>
3216	           </define>
3217	           <!--
3218	               MIXING MODE TYPE
3219	           -->
3220	           <define name="mixing-mode-type">
3221	            <choice>
3222	             <value type="string">moderator-controlled</value>
3223	             <value type="string">FCFS</value>
3224	             <value type="string">automatic</value>
3225	             <ref name="free-text-extension"/>

3227	            </choice>
3228	           </define>
3229	           <!--
3230	               CODECS TYPE
3231	           -->
3232	           <define name="codecs-type">
3233	            <interleave>
3234	            <attribute name="decision">
3235	             <ref name="decision-type"/>
3236	            </attribute>
3237	            <ref name="anyAttribute"/>
3238	            <zeroOrMore>
3239	             <element name="xcon:codec">
3240	              <ref name="codec-type"/>
3241	             </element>
3242	            </zeroOrMore>
3243	            <zeroOrMore>
3244	             <ref name="anyElement"/>
3245	            </zeroOrMore>
3246	            </interleave>
3247	           </define>
3248	           <!--
3249	               CODEC TYPE
3250	           -->
3251	           <define name="codec-type">
3252	            <interleave>
3253	            <attribute name="name">
3254	             <text/>
3255	            </attribute>
3256	            <attribute name="policy">
3257	             <ref name="policy-type"/>
3258	            </attribute>
3259	            <ref name="anyAttribute"/>
3260	            <optional>
3261	             <element name="xcon:subtype">
3262	              <text/>
3263	             </element>
3264	            </optional>
3265	            <zeroOrMore>
3266	             <ref name="anyElement"/>
3267	            </zeroOrMore>
3268	            </interleave>
3269	           </define>
3270	           <!--
3271	               DECISION TYPE
3272	           -->
3273	           <define name="decision-type">
3274	            <choice>
3275	             <value type="string">automatic</value>
3276	             <value type="string">moderator-controlled</value>
3277	             <ref name="free-text-extension"/>
3278	            </choice>
3279	           </define>
3280	           <!--
3281	               POLICY TYPE
3282	           -->
3283	           <define name="policy-type">
3284	            <choice>
3285	             <value type="string">allowed</value>
3286	             <value type="string">disallowed</value>
3287	             <ref name="free-text-extension"/>
3288	            </choice>
3289	           </define>
3290	           <!--
3291	               CONTROL TYPE
3292	           -->
3293	           <define name="control-type">
3294	            <interleave>
3295	            <ref name="anyAttribute"/>
3296	            <optional>
3297	             <element name="xcon:mute">
3298	              <data type="boolean"/>
3299	             </element>
3300	            </optional>
3301	            <optional>
3302	             <element name="xcon:pause-video">
3303	              <data type="boolean"/>
3304	             </element>
3305	            </optional>
3306	            <optional>
3307	             <element name="xcon:gain">
3308	              <ref name="gain-type"/>
3309	             </element>
3310	            </optional>
3311	            <optional>
3312	             <element name="xcon:video-layout">
3313	              <ref name="video-layout-type"/>
3314	             </element>
3315	            </optional>
3316	            <zeroOrMore>
3317	             <ref name="anyElement"/>
3318	            </zeroOrMore>
3319	            </interleave>
3320	           </define>
3321	           <!--
3322	               GAIN TYPE

3324	           -->
3325	           <define name="gain-type">
3326	             <data type="int">
3327	               <param name="minInclusive">-127</param>
3328	               <param name="maxInclusive">127</param>
3329	             </data>
3330	           </define>
3331	           <!--
3332	               VIDEO LAYOUT TYPE
3333	           -->
3334	           <define name="video-layout-type">
3335	              <choice>
3336	               <value type="string">single-view</value>
3337	               <value type="string">dual-view</value>
3338	               <value type="string">dual-view-crop</value>
3339	               <value type="string">dual-view-2x1</value>
3340	               <value type="string">dual-view-2x1-crop</value>
3341	               <value type="string">quad-view</value>
3342	               <value type="string">multiple-3x3</value>
3343	               <value type="string">multiple-4x4</value>
3344	               <value type="string">multiple-5x1</value>
3345	               <value type="string">automatic</value>
3346	               <ref name="free-text-extension"/>
3347	              </choice>
3348	           </define>
3349	           <!--
3350	               FLOOR INFORMATION TYPE
3351	           -->
3352	           <define name="floor-information-type">
3353	            <interleave>
3354	            <ref name="anyAttribute"/>
3355	            <optional>
3356	             <element name="xcon:conference-ID">
3357	              <data type="unsignedLong"/>
3358	             </element>
3359	            </optional>
3360	            <optional>
3361	             <element name="xcon:allow-floor-events">
3362	              <data type="boolean"/>
3363	             </element>
3364	            </optional>
3365	            <optional>
3366	             <element name="xcon:floor-request-handling">
3367	              <ref name="floor-request-type"/>
3368	             </element>
3369	            </optional>
3370	            <optional>
3371	             <element name="xcon:conference-floor-policy">
3372	              <ref name="conference-floor-policy"/>
3373	             </element>
3374	            </optional>
3375	            <zeroOrMore>
3376	             <ref name="anyElement"/>
3377	            </zeroOrMore>
3378	            </interleave>
3379	           </define>
3380	           <!--
3381	               FLOOR REQUEST TYPE
3382	           -->
3383	           <define name="floor-request-type">
3384	            <choice>
3385	             <value type="string">block</value>
3386	             <value type="string">confirm</value>
3387	             <ref name="free-text-extension"/>
3388	            </choice>
3389	           </define>
3390	           <!--
3391	               CONFERENCE FLOOR POLICY
3392	           -->
3393	           <define name="conference-floor-policy">
3394	            <interleave>
3395	            <ref name="anyAttribute"/>
3396	            <oneOrMore>
3397	             <element name="xcon:floor">
3398	              <interleave>
3399	              <attribute name="id">
3400	               <text/>
3401	              </attribute>
3402	              <ref name="anyAttribute"/>
3403	              <oneOrMore>
3404	               <element name="xcon:media-label">
3405	                <data type="nonNegativeInteger"/>
3406	               </element>
3407	              </oneOrMore>
3408	              <optional>
3409	               <element name="xcon:algorithm">
3410	                <ref name="algorithm-type"/>
3411	               </element>
3412	              </optional>
3413	              <optional>
3414	               <element name="xcon:max-floor-users">
3415	                <data type="nonNegativeInteger"/>
3416	               </element>
3417	              </optional>
3418	              <optional>
3419	               <element name="xcon:moderator-id">
3420	                <data type="nonNegativeInteger"/>
3421	               </element>
3422	              </optional>
3423	              <zeroOrMore>
3424	               <ref name="anyElement"/>
3425	              </zeroOrMore>
3426	              </interleave>
3427	             </element>
3428	            </oneOrMore>
3429	            </interleave>
3430	           </define>
3431	           <!--
3432	               ALGORITHM POLICY
3433	           -->
3434	           <define name="algorithm-type">
3435	            <choice>
3436	             <value type="string">moderator-controlled</value>
3437	             <value type="string">FCFS</value>
3438	             <value type="string">random</value>
3439	             <ref name="free-text-extension"/>
3440	            </choice>
3441	           </define>
3442	           <!--
3443	               USERS ADMISSION POLICY
3444	           -->
3445	           <define name="user-admission-policy-type">
3446	            <choice>
3447	             <value type="string">closedAuthenticated</value>
3448	             <value type="string">openAuthenticated</value>
3449	             <value type="string">anonymous</value>
3450	             <ref name="free-text-extension"/>
3451	            </choice>
3452	           </define>
3453	           <!--
3454	               JOIN HANDLING TYPE
3455	           -->
3456	           <define name="join-handling-type">
3457	            <choice>
3458	             <value type="string">block</value>
3459	             <value type="string">confirm</value>
3460	             <value type="string">allow</value>
3461	             <value type="string">authenticate</value>
3462	             <value type="string">directed-operator</value>
3463	             <ref name="free-text-extension"/>
3464	            </choice>
3465	           </define>
3466	           <!--
3467	               DENY USERLIST

3469	           -->
3470	           <define name="deny-user-list-type">
3471	            <interleave>
3472	            <ref name="anyAttribute"/>
3473	            <zeroOrMore>
3474	             <element name="xcon:target">
3475	              <attribute name="uri">
3476	               <data type="anyURI"/>
3477	              </attribute>
3478	              <ref name="anyAttribute"/>
3479	             </element>
3480	            </zeroOrMore>
3481	            <zeroOrMore>
3482	             <ref name="anyElement"/>
3483	            </zeroOrMore>
3484	            </interleave>
3485	           </define>
3486	           <!--
3487	               ALLOWED USERS LIST TYPE
3488	           -->
3489	           <define name="allowed-users-list-type">
3490	            <interleave>
3491	            <ref name="anyAttribute"/>
3492	            <zeroOrMore>
3493	             <element name="xcon:target">
3494	              <ref name="target-type"/>
3495	             </element>
3496	            </zeroOrMore>
3497	            <optional>
3498	             <element name="xcon:persistent-list">
3499	              <ref name="persistent-list-type"/>
3500	             </element>
3501	            </optional>
3502	            <zeroOrMore>
3503	             <ref name="anyElement"/>
3504	            </zeroOrMore>
3505	            </interleave>
3506	           </define>
3507	           <!--
3508	               PERSISTENT LIST TYPE
3509	           -->
3510	           <define name="persistent-list-type">
3511	            <interleave>
3512	              <zeroOrMore>
3513	               <element name="xcon:user">
3514	                <interleave>
3515	                <attribute name="name">
3516	                 <text/>

3518	                </attribute>
3519	                <attribute name="nickname">
3520	                 <text/>
3521	                </attribute>
3522	                <attribute name="id">
3523	                 <text/>
3524	                </attribute>
3525	                <ref name="anyAttribute"/>
3526	                <zeroOrMore>
3527	                 <element name="xcon:e-mail">
3528	                  <text/>
3529	                 </element>
3530	                </zeroOrMore>
3531	                <zeroOrMore>
3532	                 <ref name="anyElement"/>
3533	                </zeroOrMore>
3534	                </interleave>
3535	               </element>
3536	             </zeroOrMore>
3537	             <zeroOrMore>
3538	              <ref name="anyElement"/>
3539	             </zeroOrMore>
3540	            </interleave>
3541	           </define>
3542	           <!--
3543	               TARGET TYPE
3544	           -->
3545	           <define name="target-type">
3546	            <attribute name="uri">
3547	             <data type="anyURI"/>
3548	            </attribute>
3549	            <attribute name="method">
3550	             <ref name="method-type"/>
3551	            </attribute>
3552	            <ref name="anyAttribute"/>
3553	           </define>
3554	           <!--
3555	               METHOD TYPE
3556	           -->
3557	           <define name="method-type">
3558	            <choice>
3559	             <value type="string">dial-in</value>
3560	             <value type="string">dial-out</value>
3561	             <value type="string">refer</value>
3562	             <ref name="free-text-extension"/>
3563	            </choice>
3564	           </define>
3565	           <!--
3566	               ANONYMITY TYPE
3567	           -->
3568	           <define name="provide-anonymity-type">
3569	              <choice>
3570	               <value>private</value>
3571	               <value>semi-private</value>
3572	               <value>hidden</value>
3573	               <ref name="free-text-extension"/>
3574	              </choice>
3575	           </define>
3576	           <!--
3577	               MIXER TYPE
3578	           -->
3579	           <define name="mixer-type">
3580	            <interleave>
3581	            <attribute name="name">
3582	             <ref name="mixer-name-type"/>
3583	            </attribute>
3584	            <ref name="anyAttribute"/>
3585	            <zeroOrMore>
3586	             <element name="xcon:controls">
3587	              <ref name="control-type"/>
3588	             </element>
3589	            </zeroOrMore>
3590	            <zeroOrMore>
3591	             <ref name="anyElement"/>
3592	            </zeroOrMore>
3593	            </interleave>
3594	           </define>
3595	           <!--
3596	               MIXER NAME TYPE
3597	           -->
3598	           <define name="mixer-name-type">
3599	             <choice>
3600	              <value>VideoIn</value>
3601	              <value>VideoOut</value>
3602	              <value>AudioOut</value>
3603	              <value>AudioIn</value>
3604	              <ref name="free-text-extension"/>
3605	             </choice>
3606	           </define>
3607	           <!--
3608	               FREE TEXT EXTENSION
3609	               (re-define this as <notAllowed>,
3610	                if extensions beyond this spec are not used)
3611	           -->
3612	           <define name="free-text-extension">
3613	            <text/>

3615	           </define>

3617	           <!--
3618	            *********************************
3619	            EXTENSIBILITY OF THE SCHEMA
3620	            *********************************
3621	           -->
3622	           <!--
3623	               EXTENSIBILITY ELEMENTS
3624	               (re-define this as <empty/>,
3625	                if extensions beyond this spec are not used)
3626	           -->
3627	           <define name="anyElement">
3628	            <element>
3629	             <anyName>
3630	              <except>
3631	               <name>conference-description</name>
3632	               <name>host-info</name>
3633	               <name>conference-state</name>
3634	               <name>users</name>
3635	               <name>sidebars-by-ref</name>
3636	               <name>sidebars-by-val</name>
3637	               <name>display-text</name>
3638	               <name>subject</name>
3639	               <name>free-text</name>
3640	               <name>keywords</name>
3641	               <name>conf-uris</name>
3642	               <name>service-uris</name>
3643	               <name>maximum-user-count</name>
3644	               <name>available-media</name>
3645	               <name>web-page</name>
3646	               <name>uris</name>
3647	               <name>uri</name>
3648	               <name>user-count</name>
3649	               <name>active</name>
3650	               <name>locked</name>
3651	               <name>entry</name>
3652	               <name>type</name>
3653	               <name>status</name>
3654	               <name>purpose</name>
3655	               <name>modified</name>
3656	               <name>user</name>
3657	               <name>associated-aors</name>
3658	               <name>roles</name>
3659	               <name>languages</name>
3660	               <name>cascaded-focus</name>
3661	               <name>endpoint</name>
3662	               <name>referred</name>
3663	               <name>joining-method</name>
3664	               <name>joining-info</name>
3665	               <name>disconnection-method</name>
3666	               <name>disconnection-info</name>
3667	               <name>media</name>
3668	               <name>call-info</name>
3669	               <name>when</name>
3670	               <name>reason</name>
3671	               <name>by</name>
3672	               <name>sip</name>
3673	               <name>call-id</name>
3674	               <name>from-tag</name>
3675	               <name>to-tag</name>
3676	               <name>label</name>
3677	               <name>src-id</name>
3678	               <name>xcon:conference-password</name>
3679	               <name>xcon:mixing-mode</name>
3680	               <name>xcon:codecs</name>
3681	               <name>xcon:controls</name>
3682	               <name>xcon:language</name>
3683	               <name>xcon:allow-sidebars</name>
3684	               <name>xcon:allow-conference-event-subscription</name>
3685	               <name>xcon:to-mixer</name>
3686	               <name>xcon:provide-anonymity</name>
3687	               <name>xcon:allow-refer-users-dynamically</name>
3688	               <name>xcon:allow-invite-users-dynamically</name>
3689	               <name>xcon:allow-remove-users-dynamically</name>
3690	               <name>xcon:from-mixer</name>
3691	               <name>xcon:join-handling</name>
3692	               <name>xcon:user-admission-policy</name>
3693	               <name>xcon:allowed-users-list</name>
3694	               <name>xcon:deny-users-list</name>
3695	               <name>xcon:floor-information</name>
3696	               <name>xcon:conference-time</name>
3697	               <name>xcon:provide-anonymity</name>
3698	               <name>xcon:floor</name>
3699	               <name>xcon:entry</name>
3700	               <name>xcon:mixing-start-offset</name>
3701	               <name>xcon:mixing-end-offset</name>
3702	               <name>xcon:can-join-after-offset</name>
3703	               <name>xcon:must-join-before-offset</name>
3704	               <name>xcon:request-user</name>
3705	               <name>xcon:notify-end-of-conference</name>
3706	               <name>xcon:allowed-extend-mixing-end-offset</name>
3707	               <name>xcon:codec</name>
3708	               <name>xcon:subtype</name>
3709	               <name>xcon:mute</name>
3710	               <name>xcon:pause-video</name>
3711	               <name>xcon:gain</name>
3712	               <name>xcon:video-layout</name>
3713	               <name>xcon:conference-ID</name>
3714	               <name>xcon:allow-floor-events</name>
3715	               <name>xcon:floor-request-handling</name>
3716	               <name>xcon:conference-floor-policy</name>
3717	               <name>xcon:media-label</name>
3718	               <name>xcon:algorithm</name>
3719	               <name>xcon:max-floor-users</name>
3720	               <name>xcon:moderator-id</name>
3721	               <name>xcon:target</name>
3722	               <name>xcon:persistent-list</name>
3723	               <name>xcon:e-mail</name>
3724	               <name>xcon:user</name>
3725	              </except>
3726	             </anyName>
3727	             <ref name="anyExtension"/>
3728	            </element>
3729	           </define>

3731	           <define name="anyExtension">
3732	            <zeroOrMore>
3733	             <choice>
3734	              <attribute>
3735	               <anyName/>
3736	              </attribute>
3737	              <ref name="any"/>
3738	             </choice>
3739	            </zeroOrMore>
3740	           </define>

3742	           <define name="any">
3743	            <element>
3744	             <anyName/>
3745	             <zeroOrMore>
3746	              <choice>
3747	               <attribute>
3748	                <anyName/>
3749	               </attribute>
3750	               <text/>
3751	               <ref name="any"/>
3752	              </choice>
3753	             </zeroOrMore>
3754	           </element>
3755	           </define>

3757	           <!--
3758	               EXTENSIBILITY ATTRIBUTES
3759	               (re-define this as <empty/>,
3760	                if extensions beyond this spec are not used)
3761	           -->

3763	           <define name="anyAttribute">
3764	            <zeroOrMore>
3765	             <attribute>
3766	              <anyName>
3767	               <except>
3768	                <name ns="http://www.w3.org/XML/1998/namespace">lang
3769	                </name>
3770	                <name ns="">entity</name>
3771	                <name ns="">required-participant</name>
3772	                <name ns="">label</name>
3773	                <name ns="">decision</name>
3774	                <name ns="">name</name>
3775	                <name ns="">policy</name>
3776	                <name ns="">uri</name>
3777	                <name ns="">method</name>
3778	                <name ns="">id</name>
3779	                <name ns="">nickname</name>
3780	               </except>
3781	              </anyName>
3782	             </attribute>
3783	            </zeroOrMore>
3784	           </define>
3785	          </grammar>

3787	Appendix B.  Non-Normative W3C XML Schema

3789	   The non-normative W3C XML schema defines extension elements in the
3790	   "urn:ietf:params:xml:ns:xcon-conference-info" namespace.  Note that
3791	   <xs:any> extensions in this schema are stricter than in the normative
3792	   RELAX NG schema [RELAX], and the normative RELAX NG schema [RELAX]
3793	   allows unordered child elements unlike this schema (and the [RFC4575]
3794	   schema).  Also note that this schema allows also otherwise valid
3795	   extension elements to appear in the non-allowed positions.  Likewise
3796	   the cardinalities of these extension elements can not be constrained
3797	   with this schema.

3799	<?xml version="1.0" encoding="UTF-8"?>
3800	  <xs:schema
3801	     xmlns="urn:ietf:params:xml:ns:xcon-conference-info"
3802	     xmlns:info="urn:ietf:params:xml:ns:conference-info"
3803	     xmlns:xs="http://www.w3.org/2001/XMLSchema"
3804	     attributeFormDefault="unqualified" elementFormDefault="qualified"
3805	     targetNamespace="urn:ietf:params:xml:ns:xcon-conference-info">

3807	    <xs:import namespace="urn:ietf:params:xml:ns:conference-info"
3808	      schemaLocation="rfc4575.xsd"/>

3810	    <xs:import namespace="http://www.w3.org/XML/1998/namespace"
3811	      schemaLocation="http://www.w3.org/2001/03/xml.xsd"/>

3813	    <xs:element name="conference-password" type="xs:string"/>
3814	    <xs:element name="mixing-mode" type="mixing-mode-type"/>
3815	    <xs:element name="codecs" type="codecs-type"/>
3816	    <xs:element name="controls" type="controls-type"/>
3817	    <xs:element name="language" type="xs:language"/>
3818	    <xs:element name="allow-sidebars" type="xs:boolean"/>
3819	    <xs:element name="conference-time" type="conference-time-type"/>
3820	    <xs:element name="allow-conference-event-subscription"
3821	      type="xs:boolean"/>
3822	    <xs:element name="to-mixer" type="mixer-type"/>
3823	    <xs:element name="provide-anonymity"
3824	      type="provide-anonymity-type"/>
3825	    <xs:element name="allow-refer-users-dynamically"
3826	      type="xs:boolean"/>
3827	    <xs:element name="allow-invite-users-dynamically"
3828	      type="xs:boolean"/>
3829	    <xs:element name="allow-remove-users-dynamically"
3830	      type="xs:boolean"/>
3831	    <xs:element name="from-mixer" type="mixer-type"/>
3832	    <xs:element name="join-handling" type="join-handling-type"/>
3833	    <xs:element name="user-admission-policy"
3834	      type="user-admission-policy-type"/>
3835	    <xs:element name="allowed-users-list"
3836	      type="allowed-users-list-type"/>
3837	    <xs:element name="deny-users-list" type="deny-users-list-type"/>
3838	    <xs:element name="floor-information" type="floor-information-type"/>

3840	    <!-- CONFERENCE TIME -->

3842	    <xs:complexType name="conference-time-type">
3843	      <xs:sequence>
3844	        <xs:element name="entry"
3845	          minOccurs="0" maxOccurs="unbounded">
3846	          <xs:complexType>
3847	            <xs:sequence>
3848	              <xs:element name="base"
3849	                type="xs:string" minOccurs="1"/>
3850	              <xs:element name="mixing-start-offset" minOccurs="0">
3851	                <xs:complexType>
3852	                  <xs:simpleContent>
3853	                    <xs:extension base="time-type">
3854	                     <xs:attribute name="required-participant"
3855	                       type="role-type" use="required"/>
3856	                      <xs:anyAttribute namespace="##any"
3857	                        processContents="lax"/>
3858	                    </xs:extension>
3859	                  </xs:simpleContent>
3860	                </xs:complexType>
3861	              </xs:element>
3862	              <xs:element name="mixing-end-offset" minOccurs="0">
3863	                <xs:complexType>
3864	                  <xs:simpleContent>
3865	                    <xs:extension base="time-type">
3866	                      <xs:attribute name="required-participant"
3867	                        type="role-type" use="required"/>
3868	                      <xs:anyAttribute namespace="##any"
3869	                        processContents="lax"/>
3870	                    </xs:extension>
3871	                  </xs:simpleContent>
3872	                </xs:complexType>
3873	              </xs:element>
3874	              <xs:element name="can-join-after-offset" type="time-type"
3875	                minOccurs="0"/>
3876	              <xs:element name="must-join-before-offset" type="time-type"
3877	                minOccurs="0"/>
3878	              <xs:element name="request-user" type="time-type" minOccurs="0" />
3879	              <xs:element name="notify-end-of-conference"
3880	                type="xs:integer" minOccurs="0"/>
3881	              <xs:element name="allowed-extend-mixing-end-offset"
3882	                type="xs:boolean" minOccurs="0"/>
3883	              <xs:any namespace="##other" processContents="lax"
3884	                minOccurs="0" maxOccurs="unbounded"/>
3885	            </xs:sequence>
3886	          </xs:complexType>
3887	        </xs:element>
3888	        <xs:any namespace="##other" processContents="lax"
3889	          minOccurs="0" maxOccurs="unbounded"/>
3890	      </xs:sequence>
3891	      <xs:anyAttribute namespace="##any" processContents="lax"/>
3892	    </xs:complexType>

3894	    <!-- TIME TYPE -->

3896	     <xs:simpleType name="time-type">
3897	      <xs:restriction base="xs:dateTime">
3898	        <xs:pattern value=".+T.+Z.*"/>
3899	       </xs:restriction>
3900	     </xs:simpleType>

3902	    <!-- ROLE-TYPE -->
3903	    <xs:simpleType name="role-type">
3904	     <xs:restriction base="xs:string">
3905	      <xs:pattern value="none"/>
3906	      <xs:pattern value="administrator"/>
3907	      <xs:pattern value="moderator"/>
3908	      <xs:pattern value="user"/>
3909	      <xs:pattern value="observer"/>
3910	      <xs:pattern value="participant"/>
3911	      <xs:pattern value=".+"/>
3912	     </xs:restriction>
3913	    </xs:simpleType>

3915	    <!-- MIXING MODE TYPE -->

3917	    <xs:simpleType name="mixing-mode-type">
3918	      <xs:restriction base="xs:string">
3919	        <xs:pattern value="moderator-controlled"/>
3920	        <xs:pattern value="FCFS"/>
3921	        <xs:pattern value="automatic"/>
3922	        <xs:pattern value=".+"/>
3923	      </xs:restriction>
3924	    </xs:simpleType>

3926	    <!-- CODECS TYPE -->

3928	    <xs:complexType name="codecs-type">
3929	      <xs:sequence>
3930	        <xs:element name="codec" type="codec-type"/>
3931	        <xs:any namespace="##other" processContents="lax"
3932	          minOccurs="0" maxOccurs="unbounded"/>
3933	      </xs:sequence>
3934	      <xs:attribute name="decision"
3935	        type="decision-type" use="required"/>
3936	      <xs:anyAttribute namespace="##any" processContents="lax"/>
3937	    </xs:complexType>

3939	    <!-- CODEC TYPE -->

3941	    <xs:complexType name="codec-type">
3942	      <xs:sequence>
3943	        <xs:element name="subtype" type="xs:string" minOccurs="0"/>
3944	        <xs:any namespace="##other" processContents="lax"
3945	          minOccurs="0" maxOccurs="unbounded"/>
3946	      </xs:sequence>
3947	      <xs:attribute name="name"
3948	        type="xs:string" use="required"/>
3949	      <xs:attribute name="policy"
3950	        type="policy-type" use="required"/>

3952	      <xs:anyAttribute namespace="##any" processContents="lax"/>
3953	    </xs:complexType>

3955	    <!-- DECISION TYPE -->

3957	    <xs:simpleType name="decision-type">
3958	      <xs:restriction base="xs:string">
3959	        <xs:pattern value="automatic"/>
3960	        <xs:pattern value="moderator-controlled"/>
3961	        <xs:pattern value=".+"/>
3962	      </xs:restriction>
3963	    </xs:simpleType>

3965	    <!-- POLICY TYPE -->

3967	     <xs:simpleType name="policy-type">
3968	      <xs:restriction base="xs:string">
3969	        <xs:pattern value="allowed"/>
3970	        <xs:pattern value="disallowed"/>
3971	        <xs:pattern value=".+"/>
3972	      </xs:restriction>
3973	     </xs:simpleType>

3975	    <!-- CONTROL TYPE -->

3977	    <xs:complexType name="controls-type">
3978	      <xs:sequence>
3979	        <xs:element name="mute"
3980	          type="xs:boolean" minOccurs="0"/>
3981	        <xs:element name="pause-video"
3982	          type="xs:boolean" minOccurs="0"/>
3983	        <xs:element name="gain"
3984	          type="gain-type" minOccurs="0"/>
3985	        <xs:element name="video-layout"
3986	          type="video-layout-type" default="single-view" minOccurs="0"/>
3987	        <xs:any namespace="##other" processContents="lax"
3988	          minOccurs="0" maxOccurs="unbounded"/>
3989	      </xs:sequence>
3990	      <xs:anyAttribute namespace="##any" processContents="lax"/>
3991	    </xs:complexType>

3993	    <!-- GAIN TYPE -->

3995	    <xs:simpleType name="gain-type">
3996	      <xs:restriction base="xs:integer">
3997	        <xs:minInclusive value="-127"/>
3998	        <xs:maxInclusive value="127"/>
3999	      </xs:restriction>

4001	    </xs:simpleType>

4003	    <!-- VIDEO LAYOUT TYPE -->

4005	    <xs:simpleType name="video-layout-type">
4006	      <xs:restriction base="xs:string">
4007	        <xs:pattern value="single-view"/>
4008	        <xs:pattern value="dual-view"/>
4009	        <xs:pattern value="dual-view-crop"/>
4010	        <xs:pattern value="dual-view-2x1"/>
4011	        <xs:pattern value="dual-view-2x1-crop"/>
4012	        <xs:pattern value="quad-view"/>
4013	        <xs:pattern value="multiple-3x3"/>
4014	        <xs:pattern value="multiple-4x4"/>
4015	        <xs:pattern value="multiple-5x1"/>
4016	        <xs:pattern value="automatic"/>
4017	        <xs:pattern value=".+"/>
4018	      </xs:restriction>
4019	    </xs:simpleType>

4021	    <!-- FLOOR INFORMATION TYPE -->

4023	    <xs:complexType name="floor-information-type">
4024	      <xs:sequence>
4025	        <xs:element name="conference-ID"
4026	          type="xs:unsignedLong" minOccurs="0"/>
4027	        <xs:element name="allow-floor-events"
4028	          type="xs:boolean" default="false" minOccurs="0"/>
4029	        <xs:element name="floor-request-handling"
4030	          type="floor-request-handling-type" minOccurs="0"/>
4031	        <xs:element name="conference-floor-policy"
4032	          type="conference-floor-policy" minOccurs="0"/>
4033	        <xs:any namespace="##other" processContents="lax"
4034	          minOccurs="0" maxOccurs="unbounded"/>
4035	      </xs:sequence>
4036	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4037	    </xs:complexType>

4039	    <!-- FLOOR REQUEST TYPE -->

4041	    <xs:simpleType name="floor-request-handling-type">
4042	      <xs:restriction base="xs:string">
4043	        <xs:pattern value="block"/>
4044	        <xs:pattern value="confirm"/>
4045	        <xs:pattern value=".+"/>
4046	      </xs:restriction>
4047	    </xs:simpleType>
4048	    <!-- CONFERENCE FLOOR POLICY -->

4050	    <xs:complexType name="conference-floor-policy">
4051	      <xs:sequence>
4052	        <xs:element name="floor" maxOccurs="unbounded">
4053	          <xs:complexType>
4054	            <xs:sequence>
4055	              <xs:element name="media-label"
4056	                type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
4057	              <xs:element name="algorithm"
4058	                type="algorithm-type" minOccurs="0"/>
4059	              <xs:element name="max-floor-users"
4060	                type="xs:nonNegativeInteger" minOccurs="0"/>
4061	              <xs:element name="moderator-id"
4062	                type="xs:nonNegativeInteger" minOccurs="0"/>
4063	                <xs:any namespace="##other" processContents="lax"
4064	                  minOccurs="0" maxOccurs="unbounded"/>
4065	            </xs:sequence>
4066	            <xs:attribute name="id" type="xs:string" use="required"/>
4067	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4068	          </xs:complexType>
4069	        </xs:element>
4070	      </xs:sequence>
4071	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4072	    </xs:complexType>

4074	    <!-- ALGORITHM TYPE -->

4076	    <xs:simpleType name="algorithm-type">
4077	      <xs:restriction base="xs:string">
4078	        <xs:pattern value="moderator-controlled"/>
4079	        <xs:pattern value="FCFS"/>
4080	        <xs:pattern value="random"/>
4081	        <xs:pattern value=".+"/>
4082	      </xs:restriction>
4083	    </xs:simpleType>

4085	    <!-- USER ADMISSION POLICY TYPE -->

4087	    <xs:simpleType name="user-admission-policy-type">
4088	      <xs:restriction base="xs:string">
4089	        <xs:pattern value="closedAuthenticated"/>
4090	        <xs:pattern value="openAuthenticated"/>
4091	        <xs:pattern value="anonymous"/>
4092	        <xs:pattern value=".+"/>
4093	      </xs:restriction>
4094	    </xs:simpleType>
4095	    <!-- JOIN HANDLING TYPE -->

4097	    <xs:simpleType name="join-handling-type">
4098	      <xs:restriction base="xs:string">
4099	        <xs:pattern value="block"/>
4100	        <xs:pattern value="confirm"/>
4101	        <xs:pattern value="allow"/>
4102	        <xs:pattern value="authenticate"/>
4103	        <xs:pattern value="directed-operator"/>
4104	        <xs:pattern value=".+"/>
4105	       </xs:restriction>
4106	    </xs:simpleType>

4108	   <!-- DENY USER LIST TYPE -->

4110	    <xs:complexType name="deny-users-list-type">
4111	      <xs:sequence>
4112	        <xs:element name="target" minOccurs="0" maxOccurs="unbounded">
4113	          <xs:complexType>
4114	            <xs:attribute name="uri" use="required" type="xs:anyURI"/>
4115	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4116	          </xs:complexType>
4117	        </xs:element>
4118	        <xs:any namespace="##other" processContents="lax"
4119	          minOccurs="0" maxOccurs="unbounded"/>
4120	      </xs:sequence>
4121	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4122	    </xs:complexType>

4124	     <!-- ALLOWED USERS LIST TYPE -->

4126	    <xs:complexType name="allowed-users-list-type">
4127	      <xs:sequence>
4128	        <xs:element name="target" type="target-type"
4129	          minOccurs="0" maxOccurs="unbounded">
4130	        </xs:element>
4131	        <xs:element name="persistent-list"
4132	          type="persistent-list-type"
4133	          minOccurs="0"/>
4134	        <xs:any namespace="##other" processContents="lax"
4135	          minOccurs="0" maxOccurs="unbounded"/>
4136	      </xs:sequence>
4137	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4138	    </xs:complexType>

4140	    <!-- PERSISTENT LIST TYPE -->

4142	    <xs:complexType name="persistent-list-type">
4143	      <xs:sequence>
4144	        <xs:element name="user" minOccurs="0" maxOccurs="unbounded">
4145	          <xs:complexType>
4146	            <xs:sequence>
4147	              <xs:element name="email" type="xs:string"
4148	                minOccurs="0" maxOccurs="unbounded"/>
4149	              <xs:any namespace="##other" processContents="lax"
4150	                minOccurs="0" maxOccurs="unbounded"/>
4151	            </xs:sequence>
4152	            <xs:attribute name="name"
4153	              use="required" type="xs:anyURI"/>
4154	            <xs:attribute name="nickname"
4155	              use="required" type="xs:string"/>
4156	            <xs:attribute name="id"
4157	              use="required" type="xs:string"/>
4158	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4159	          </xs:complexType>
4160	        </xs:element>
4161	        <xs:any namespace="##other" processContents="lax"
4162	          minOccurs="0" maxOccurs="unbounded"/>
4163	      </xs:sequence>
4164	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4165	    </xs:complexType>

4167	    <!-- TARGET TYPE -->

4169	    <xs:complexType name="target-type">
4170	      <xs:attribute name="uri" use="required"
4171	        type="xs:anyURI"/>
4172	      <xs:attribute name="method" use="required"
4173	        type="method-type"/>
4174	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4175	    </xs:complexType>

4177	    <!-- METHOD TYPE -->

4179	    <xs:simpleType name="method-type">
4180	      <xs:restriction base="xs:string">
4181	        <xs:pattern value="dial-in"/>
4182	        <xs:pattern value="dial-out"/>
4183	        <xs:pattern value="refer"/>
4184	        <xs:pattern value=".+"/>
4185	      </xs:restriction>
4186	    </xs:simpleType>

4188	    <!-- ANONYMITY TYPE -->

4190	    <xs:simpleType name="provide-anonymity-type">
4191	      <xs:restriction base="xs:string">
4192	        <xs:pattern value="private"/>
4193	        <xs:pattern value="semi-private"/>
4194	        <xs:pattern value="hidden"/>
4195	        <xs:pattern value=".+"/>
4196	      </xs:restriction>
4197	    </xs:simpleType>

4199	    <!-- MIXER TYPE -->

4201	    <xs:complexType name="mixer-type">
4202	      <xs:sequence>
4203	        <xs:element name="controls" type="controls-type"
4204	          minOccurs="0" maxOccurs="unbounded"/>
4205	        <xs:any namespace="##other" processContents="lax"
4206	          minOccurs="0" maxOccurs="unbounded"/>
4207	      </xs:sequence>
4208	      <xs:attribute name="name" type="mixer-name-type"
4209	        use="required"/>
4210	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4211	    </xs:complexType>

4213	    <!-- MIXER NAME TYPE -->

4215	    <xs:simpleType name="mixer-name-type">
4216	      <xs:restriction base="xs:string">
4217	        <xs:pattern value="VideoIn"/>
4218	        <xs:pattern value="VideoOut"/>
4219	        <xs:pattern value="AudioOut"/>
4220	        <xs:pattern value="AudioIn"/>
4221	        <xs:pattern value=".+"/>
4222	      </xs:restriction>
4223	    </xs:simpleType>

4225	  </xs:schema>

4227	Authors' Addresses

4229	   Oscar Novo
4230	   Ericsson
4231	   Hirsalantie 11
4232	   Jorvas  02420
4233	   Finland

4235	   Email: Oscar.Novo@ericsson.com
4236	   Gonzalo Camarillo
4237	   Ericsson
4238	   Hirsalantie 11
4239	   Jorvas  02420
4240	   Finland

4242	   Email: Gonzalo.Camarillo@ericsson.com

4244	   David P. Morgan
4245	   Fidelity Investments
4246	   82 Devonshire St, MZ V3C
4247	   Boston, MA  02109-3614
4248	   USA

4250	   Email: Dave.Morgan@fmr.com

4252	   Roni Even
4253	   Polycom
4254	   94 Derech Em Hamoshavot
4255	   Petach Tikva  49130
4256	   Israel

4258	   Email: roni.even@polycom.co.il

4260	   Jari Urpalainen
4261	   Nokia
4262	   Itamerenkatu 11-13
4263	   Helsinki  00180
4264	   Finland

4266	   Phone: +358 7180 37686
4267	   Email: jari.urpalainen@nokia.com

4269	Full Copyright Statement

4271	   Copyright (C) The IETF Trust (2008).

4273	   This document is subject to the rights, licenses and restrictions
4274	   contained in BCP 78, and except as set forth therein, the authors
4275	   retain all their rights.

4277	   This document and the information contained herein are provided on an
4278	   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
4279	   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND
4280	   THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS
4281	   OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF
4282	   THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
4283	   WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

4285	Intellectual Property

4287	   The IETF takes no position regarding the validity or scope of any
4288	   Intellectual Property Rights or other rights that might be claimed to
4289	   pertain to the implementation or use of the technology described in
4290	   this document or the extent to which any license under such rights
4291	   might or might not be available; nor does it represent that it has
4292	   made any independent effort to identify any such rights.  Information
4293	   on the procedures with respect to rights in RFC documents can be
4294	   found in BCP 78 and BCP 79.

4296	   Copies of IPR disclosures made to the IETF Secretariat and any
4297	   assurances of licenses to be made available, or the result of an
4298	   attempt made to obtain a general license or permission for the use of
4299	   such proprietary rights by implementers or users of this
4300	   specification can be obtained from the IETF on-line IPR repository at
4301	   http://www.ietf.org/ipr.

4303	   The IETF invites any interested party to bring to its attention any
4304	   copyrights, patents or patent applications, or other proprietary
4305	   rights that may cover technology that may be required to implement
4306	   this standard.  Please address the information to the IETF at
4307	   ietf-ipr@ietf.org.