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2	XCON                                                             O. Novo
3	Internet-Draft                                              G. Camarillo
4	Intended status: Standards Track                                Ericsson
5	Expires: August 14, 2010                                       D. Morgan
6	                                                    Fidelity Investments
7	                                                           J. Urpalainen
8	                                                                   Nokia
9	                                                       February 10, 2010

11	 Conference Information Data Model for Centralized Conferencing (XCON)
12	                draft-ietf-xcon-common-data-model-15.txt

14	Abstract

16	   This document defines an Extensible Markup Language (XML)-based
17	   conference information data model for centralized conferencing
18	   (XCON).  A conference information data model is designed to convey
19	   information about the conference and about participation in the
20	   conference.  The conference information data model defined in this
21	   document constitutes an extension of the data format specified in the
22	   Session Initiation Protocol (SIP) Event Package for Conference State.

24	Status of this Memo

26	   This Internet-Draft is submitted to IETF in full conformance with the
27	   provisions of BCP 78 and BCP 79.

29	   Internet-Drafts are working documents of the Internet Engineering
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31	   other groups may also distribute working documents as Internet-
32	   Drafts.

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71	   than English.

73	Table of Contents

75	   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
76	   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  6
77	   3.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
78	     3.1.  Data Model Format  . . . . . . . . . . . . . . . . . . . .  6
79	     3.2.  Data Model Namespace . . . . . . . . . . . . . . . . . . .  6
80	     3.3.  The Conference Object Identifier . . . . . . . . . . . . .  7
81	       3.3.1.  Conference Object URI Definition . . . . . . . . . . .  9
82	     3.4.  Data Model Structure . . . . . . . . . . . . . . . . . . .  9
83	   4.  Data Model Definition  . . . . . . . . . . . . . . . . . . . . 10
84	     4.1.  <conference-info>  . . . . . . . . . . . . . . . . . . . . 13
85	     4.2.  <conference-description> . . . . . . . . . . . . . . . . . 14
86	       4.2.1.  <language> . . . . . . . . . . . . . . . . . . . . . . 14
87	       4.2.2.  <display-text> . . . . . . . . . . . . . . . . . . . . 14
88	       4.2.3.  <subject>  . . . . . . . . . . . . . . . . . . . . . . 14
89	       4.2.4.  <free-text>  . . . . . . . . . . . . . . . . . . . . . 15
90	       4.2.5.  <keywords> . . . . . . . . . . . . . . . . . . . . . . 15
91	       4.2.6.  <allow-sidebars> . . . . . . . . . . . . . . . . . . . 15
92	       4.2.7.  <cloning-parent> . . . . . . . . . . . . . . . . . . . 15
93	       4.2.8.  <sidebar-parent> . . . . . . . . . . . . . . . . . . . 15
94	       4.2.9.  <conference-time>  . . . . . . . . . . . . . . . . . . 15
95	       4.2.10. <conf-uris>  . . . . . . . . . . . . . . . . . . . . . 17
96	       4.2.11. <service-uris> . . . . . . . . . . . . . . . . . . . . 17
97	       4.2.12. <maximum-user-count> . . . . . . . . . . . . . . . . . 17
98	       4.2.13. <available-media>  . . . . . . . . . . . . . . . . . . 17
99	     4.3.  <host-info>  . . . . . . . . . . . . . . . . . . . . . . . 19
100	     4.4.  <conference-state> . . . . . . . . . . . . . . . . . . . . 20
101	       4.4.1.  <allow-conference-event-subscription>  . . . . . . . . 20
102	       4.4.2.  <user-count> . . . . . . . . . . . . . . . . . . . . . 20
103	       4.4.3.  <active> . . . . . . . . . . . . . . . . . . . . . . . 20
104	       4.4.4.  <locked> . . . . . . . . . . . . . . . . . . . . . . . 20
105	     4.5.  <floor-information>  . . . . . . . . . . . . . . . . . . . 20
106	       4.5.1.  <conference-ID>  . . . . . . . . . . . . . . . . . . . 20
107	       4.5.2.  <allow-floor-events> . . . . . . . . . . . . . . . . . 21
108	       4.5.3.  <floor-request-handling> . . . . . . . . . . . . . . . 21
109	       4.5.4.  <conference-floor-policy>  . . . . . . . . . . . . . . 21
110	     4.6.  <users>  . . . . . . . . . . . . . . . . . . . . . . . . . 22
111	       4.6.1.  <join-handling>  . . . . . . . . . . . . . . . . . . . 22
112	       4.6.2.  <user-admission-policy>  . . . . . . . . . . . . . . . 23
113	       4.6.3.  <allowed-users-list> . . . . . . . . . . . . . . . . . 23
114	       4.6.4.  <deny-users-list>  . . . . . . . . . . . . . . . . . . 24
115	       4.6.5.  <user> and Its <user> Sub-elements . . . . . . . . . . 25
116	         4.6.5.1.  <display-text> . . . . . . . . . . . . . . . . . . 26
117	         4.6.5.2.  <associated-aors>  . . . . . . . . . . . . . . . . 26
118	         4.6.5.3.  <provide-anonymity>  . . . . . . . . . . . . . . . 26
119	         4.6.5.4.  <roles>  . . . . . . . . . . . . . . . . . . . . . 26
120	         4.6.5.5.  <languages>  . . . . . . . . . . . . . . . . . . . 27
121	         4.6.5.6.  <cascaded-focus> . . . . . . . . . . . . . . . . . 27
122	         4.6.5.7.  <allow-refer-users-dynamically>  . . . . . . . . . 27
123	         4.6.5.8.  <allow-invite-users-dynamically> . . . . . . . . . 27
124	         4.6.5.9.  <allow-remove-users-dynamically> . . . . . . . . . 27
125	         4.6.5.10. <endpoint> . . . . . . . . . . . . . . . . . . . . 28
126	     4.7.  <sidebars-by-ref>  . . . . . . . . . . . . . . . . . . . . 29
127	     4.8.  <sidebars-by-val>  . . . . . . . . . . . . . . . . . . . . 29
128	   5.  RELAX NG Schema  . . . . . . . . . . . . . . . . . . . . . . . 29
129	   6.  XML Schema Extensibility . . . . . . . . . . . . . . . . . . . 40
130	   7.  XML Example  . . . . . . . . . . . . . . . . . . . . . . . . . 40
131	   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 50
132	     8.1.  Authentication, Access Control, and Integrity  . . . . . . 50
133	     8.2.  Confidentiality  . . . . . . . . . . . . . . . . . . . . . 50
134	   9.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 51
135	     9.1.  Relax NG Schema Registration . . . . . . . . . . . . . . . 51
136	     9.2.  XML Namespace Registration . . . . . . . . . . . . . . . . 51
137	     9.3.  Conference Object Identifier Registration  . . . . . . . . 52
138	     9.4.  Conference User Identifier Registration  . . . . . . . . . 53
139	   10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 53
140	   11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 54
141	     11.1. Normative References . . . . . . . . . . . . . . . . . . . 54
142	     11.2. Informative References . . . . . . . . . . . . . . . . . . 54
143	   Appendix A.  Non-Normative RELAX NG Schema in XML Syntax . . . . . 55
144	   Appendix B.  Non-Normative W3C XML Schema  . . . . . . . . . . . . 83
145	   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 92

147	1.  Introduction

149	   There is a core data set of conference information that is utilized
150	   in any conference, independent of the specific conference media.
151	   This core data set called the 'conference information data model' is
152	   defined in this document using an Extensible Markup Language (XML)-
153	   based.  The conference information data model defined in this
154	   document is logically represented by the conference object.

156	   Conference objects are a fundamental concept in Centralized
157	   Conferencing, as described in the Centralized Conferencing Framework
158	   [RFC5239].  A conference object contains data that represents a
159	   conference during each of its various stages (e.g., created/creation,
160	   reserved/reservation, active/activation, completed/completion).  A
161	   conference object can be manipulated using a conference control
162	   protocol at a conference server.  The conference object represents a
163	   particular instantiation of a conference information data model.
164	   Consequently, conference objects follow the XML format defined in
165	   this document.

167	   A conference object contains the core information of a conference
168	   (i.e., capabilities, membership, call control signaling, media, etc.)
169	   and specifies by whom, and in which way that information can be
170	   manipulated.

172	   Figure 1 shows the logical functional elements of a conference server
173	   as defined by the Centralized Conferencing Framework [RFC5239].  They
174	   are a Conference Control Server, a Floor Control Server, a number of
175	   Foci, and a Notification Service.  A conference control protocol
176	   provides the interface between a conference control client and the
177	   conference control server.  A floor control protocol (e.g., BFCP
178	   [RFC4582]) provides the interface between a floor control client and
179	   the floor control server.  A call signaling protocol (e.g., SIP,
180	   H.323, Q.931, ISUP, etc.) provides the interface between a call
181	   signaling client and a Focus.  A notification protocol (e.g., SIP-
182	   based event notifications [RFC3265]) provides the interface between
183	   the conferencing client and the Notification Service.  Within a
184	   conference, the conference control server, floor control server, and
185	   focus can modify the information in the conference object.

187	      ...............................................................
188	      . Conferencing Server                                         .
189	      .       +---------------------------------------------------+ .
190	      .       |       C o n f e r e n c e   o b j e c t           | .
191	      .     +-+--------------------------------------------------+| .
192	      .     |       C o n f e r e n c e   o b j e c t            || .
193	      .   +-+---------------------------------------------------+|| .
194	      .   |       C o n f e r e n c e   o b j e c t             ||| .
195	      .   | +--------------------------------------------------+||| .
196	      .   | | Conference Information Data Model                |||| .
197	      .   | | +----------------------------------------------+ |||| .
198	      .   | | | Conference description  (times, duration)    | |||| .
199	      .   | | +----------------------------------------------+ |||| .
200	      .   | | +----------------------------------------------+ |||| .
201	      .   | | | Host information                             | |||| .
202	      .   | | +----------------------------------------------+ |||| .
203	      .   | | +----------------------------------------------+ |||| .
204	      .   | | | Conference state                             | |||| .
205	      .   | | +----------------------------------------------+ |||| .
206	      .   | | +----------------------------------------------+ |||| .
207	      .   | | | Floor information                            | |||| .
208	      .   | | +----------------------------------------------+ |||| .
209	      .   | | +----------------------------------------------+ |||| .
210	      .   | | | Membership (users, capacity)                 | |||| .
211	      .   | | +----------------------------------------------+ |||| .
212	      .   | | +----------------------------------------------+ |||| .
213	      .   | | | Sidebars, Etc.                               | |||| .
214	      .   | | +----------------------------------------------+ |||| .
215	      .   | | +----------------------------------------------+ |||| .
216	      .   | | | Etc.                                         | |||| .
217	      .   | | +----------------------------------------------+ |||+ .
218	      .   | +--------------------------------------------------+|+  .
219	      .   +----^------------------^-------------^--------|------+   .
220	      .        |                  |             |        |          .
221	      . +------v-------+ +--------v-----+ +-----v-+ +----v-------+  .
222	      . | Conference   | | Floor        | |       | |            |  .
223	      . | Control      | | Control      | |Foci   | |Notification|  .
224	      . | Server       | | Server       | |       | |Service     |  .
225	      . +-----^--------+ +---^----------+ +-^-----+ +------------+  .
226	      ........|..............|..............|..........|.............
227	              |Conference    |Floor         |Call      |Notification
228	              |Control       |Control       |Signaling |Protocol
229	              |Protocol      |Protocol      |Protocol  |
230	      ........v..............v..............v..........v.............
231	      .     C  o  n  f  e  r  e  n  c  i  n  g     C  l i  e  n  t  .
232	      ...............................................................

234	                 Figure 1: Conference Server Architecture

236	   The Session Initiation Protocol (SIP) Event Package for Conference
237	   State, specified in [RFC4575], already defines a data format for
238	   conferences.  However, that model is SIP specific and lacks elements
239	   related to some of the functionality defined by the Centralized
240	   Conferencing Framework [RFC5239] (e.g., floor control).  The data
241	   model defined in this document constitutes a superset of the data
242	   format defined in [RFC4575].  The result is a data format that
243	   supports more call signaling protocols besides SIP and that covers
244	   all the functionality defined in the Centralized Conferencing
245	   Framework [RFC5239].

247	2.  Terminology

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

253	   This document uses the terminology defined in the Centralized
254	   Conferencing Framework [RFC5239], the SIPPING conferencing framework
255	   [RFC4353] and the BFCP (Binary Floor Control Protocol) specification
256	   [RFC4582].  Readers of this document should be familiar with the
257	   terminology used in those documents.

259	3.  Overview

261	   The data model specified in this document is the result of extending
262	   the data format defined in [RFC4575] with new elements.  Examples of
263	   such extensions include scheduling elements, media control elements,
264	   floor control elements, non-SIP URIs, and addition of localization
265	   extensions to text elements.  This data model can be used by
266	   conference servers providing different types of basic conferences.
267	   It is expected that this data model can be further extended with new
268	   elements in the future in order to implement additional advanced
269	   features.

271	3.1.  Data Model Format

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

278	3.2.  Data Model Namespace

280	   This specification defines a new namespace specification for
281	   identifying the elements defined in the data model.  This namespace
282	   is as follows:

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

286	3.3.  The Conference Object Identifier

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

295	   A conferencing system may maintain a relationship between the
296	   conference object identifiers and the identifiers associated with
297	   each of the complementary centralized conferencing protocols (e.g.,
298	   call signaling protocols, BFCP, etc.).  To facilitate the maintenance
299	   of these relationships, the conference object identifier acts as a
300	   top level identifier within the conferencing system for the purpose
301	   of identifying the interfaces for these other protocols.  This
302	   implicit binding provides a structured mapping of the various
303	   protocols with the associated conference object Identifier.  Figure 2
304	   illustrates the relationship between the identifiers used for the
305	   protocols and the general conference object identifier (XCON-URI).

307	                            +--------------------------+
308	                            |       Conference         |
309	                            |         Object           |
310	                            |       Identifier         |
311	                            +--------------------------+
312	                            |  xcon:Ji092i@example.com |
313	                            +------+-------------------+
314	                                        |
315	                                        |
316	                                        |
317	                      +-----------------+---------------+
318	                      |                                 |
319	          +-----------+-----------+          +----------+---------+
320	          |   CSP Conference IDs  |          |BFCP 'Conference ID'|
321	          +-----------------------+          +--------------------+
322	          | h323:i092@example.com |          |        i092        |
323	          | tel:+44(0)2920930033  |          +----------+---------+
324	          | sip:i092@example.com  |                     |
325	          +-----------------------+             +-------+--------+
326	                                                | BFCP 'Floor ID'|
327	                                                +----------------+
328	                                                |      543       |
329	                                                |      236       |
330	                                                +----------------+

332	                    Figure 2: Conference Object Mapping

334	   In Figure 2, the conference object identifier acts as the top level
335	   key in the identification process.  The call signaling protocols have
336	   an associated conference user identifier, often represented in the
337	   form of URIs.  The binary floor control protocol, as defined in
338	   [RFC4582], defines the 'conference ID' identifier which represents a
339	   conference instance within floor control.  When created within the
340	   conferencing system, the 'conference ID' has a 1:1 mapping to the
341	   unique conference object Identifier(XCON-URI).  Operations associated
342	   with the conference control protocols are directly associated with
343	   the conference object, thus the primary identifier associated with
344	   these protocols is the conference object identifier(XCON-URI).  The
345	   mappings between additional protocols/interface is not strictly 1:1
346	   and does allow for multiple occurrences.  For example, multiple call
347	   signaling protocols will each have a representation that is
348	   implicitly linked to the top level conference object identifier e.g.
349	   H323 and SIP URIs that represent a conference instance.  It should be
350	   noted that a conferencing system is free to structure such
351	   relationships as required and this information is just included as a
352	   guideline that can be used.

354	   Further elements can be added to the tree representation in Figure 2
355	   to enable a complete representation of a conference instance within a
356	   conferencing system.

358	3.3.1.  Conference Object URI Definition

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

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

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

366	3.4.  Data Model Structure

368	   The information in this data model is structured in the following
369	   manner.  All the information related to a conference is contained in
370	   a <conference-info> element.  The <conference-info> element contains
371	   the following child elements:

373	   o  The <conference-description> element describes the conference as a
374	      whole.  It has, for instance, information about the URI of the
375	      conference, maximum users allowed in the conference, media
376	      available in the conference, or the time the conference will
377	      start.
378	   o  The <host-info> element contains information about the entity
379	      hosting the conference (e.g., its URI).
380	   o  The <conference-state> element informs the subscribers about the
381	      changes in the overall conference information.
382	   o  The <floor-information> element contains information about the
383	      status of the different floors in the conference.
384	   o  The <users> element describes the membership information as a
385	      whole.  The <users> element contains a set of <user> child
386	      elements, each describing a single participant in the conference.
387	   o  If a participant in the main conference joins a sidebar, a new
388	      element is created in the conference referenced from the
389	      <sidebars-by-ref> element or under one of the <sidebars-by-val>
390	      elements.

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

398	4.  Data Model Definition

400	   The following non-normative diagram shows the structure of conference
401	   object documents.  The operator "!" preceding an element indicates
402	   that the element is mandatory in the data model.  The operator "*"
403	   following an element indicates that the element is introduced and
404	   defined in this document.  That is, elements without a "*" have
405	   already been defined in [RFC4575].

407	   !<conference-info>
408	        |
409	        |--!<conference-description>
410	        |     |--<language>*
411	        |     |--<display-text>
412	        |     |--<subject>
413	        |     |--<free-text>
414	        |     |--<keywords>
415	        |     |--<allow-sidebars>*
416	        |     |--<cloning-parent>*
417	        |     |--<sidebar-parent>*
418	        |     |--<conference-time>*
419	        |     |      |--<entry>*
420	        |     |      |    |--<base>*
421	        |     |      |    |--<mixing-start-offset>*
422	        |     |      |    |--<mixing-end-offset>*
423	        |     |      |    |--<can-join-after-offset>*
424	        |     |      |    |--<must-join-before-offset>*
425	        |     |      |    |--<request-user>*
426	        |     |      |    |--<notify-end-of-conference>*
427	        |     |      |    |--<allowed-extend-mixing-end-offset>*
428	        |     |           ...
429	        |     |--<conf-uris>
430	        |     |      |--<entry>
431	        |     |      |    |--<uri>
432	        |     |      |    |--<display-text>
433	        |     |      |    |--<purpose>
434	        |     |      |    |--<conference-password>*
435	        |     |      ...
436	        |     |--<service-uris>
437	        |     |      |--<entry>
438	        |     |      |    |--<uri>
439	        |     |      |    |--<display-text>
440	        |     |      |    |--<purpose>
441	        |     |      ...
442	        |     |--<maximum-user-count>
443	        |     |      ...
444	        |     |--<available-media>
445	        |     |      |--!<entry>
446	        |     |      |     |--<display-text>
447	        |     |      |     |--<type>
448	        |     |      |     |--<status>
449	        |     |      |     |--<mixing-mode>*
450	        |     |      |     |--<codecs>*
451	        |     |      |     |    |--<codec>*
452	        |     |      |     |    |    |--<subtype>*
453	        |     |      |     |    |--<codec>*
454	        |     |      |     |    |    |--<subtype>*
455	        |     |      |     |    ...
456	        |     |      |     |--<controls>*
457	        |     |      |     |    |--<mute>*
458	        |     |      |     |    |--<gain>*
459	        |     |      |     |   ...
460	        |     |      |--<entry>
461	        |     |      |     |--<display-text>
462	        |     |      |     |--<type>
463	        |     |      |     |--<status>
464	        |     |      |     |--<mixing-mode>*
465	        |     |      |     |--<codecs>*
466	        |     |      |     |    |--<codec>*
467	        |     |      |     |    |    |--<subtype>*
468	        |     |      |     |    |--<codec>*
469	        |     |      |     |    |    |--<subtype>*
470	        |     |      |     |    ...
471	        |     |      |     |--<controls>*
472	        |     |      |     |    |--<pause-video>*
473	        |     |      |     |    |--<video-layout>*
474	        |     |      |     |   ...
475	        |     |      ...
476	        |
477	        |--<host-info>
478	        |     |--<display-text>
479	        |     |--<web-page>
480	        |     |--<uris>
481	        |     |     |--<entry>
482	        |     |     |    |--<uri>
483	        |     |     |    |--<display-text>
484	        |           ...
485	        |--<conference-state>
486	        |     |--<allow-conference-event-subscription>*
487	        |     |--<user-count>
488	        |     |--<active>
489	        |     |--<locked>
490	        |
491	        |--<floor-information>*
492	        |     |--<conference-ID>*
493	        |     |--<allow-floor-events>*
494	        |     |--<floor-request-handling>*
495	        |     |--<conference-floor-policy>*
496	        |     |     |--<floor>*
497	        |     |     |    |--!<media-label>*
498	        |     |     |    |--!<algorithm>*
499	        |     |     |    |--<max-floor-users>*
500	        |     |     |    |--<moderator-id>*
501	        |     |     |   ...
502	        |     |     ...
503	        |
504	        |--!<users>
505	        |     |--<join-handling>*
506	        |     |--<user-admission-policy>*
507	        |     |--<allowed-users-list>*
508	        |     |     |--<target>*
509	        |     |     |
510	        |     |     |--<persistent-list>*
511	        |     |     |     |--<user>*
512	        |     |     |     |     |-- <email>*
513	        |     |
514	        |     |--<deny-users-list>*
515	        |     |
516	        |     |--<user>
517	        |     |    |--<display-text>
518	        |     |    |--<associated-aors>
519	        |     |    |--<provide-anonymity>*
520	        |     |    |--<roles>
521	        |     |    |    |
522	        |     |    |   ...
523	        |     |    |--<languages>
524	        |     |    |--<cascaded-focus>
525	        |     |    |--<allow-refer-users-dynamically>*
526	        |     |    |--<allow-invite-users-dynamically>*
527	        |     |    |--<allow-remove-users-dynamically>*
528	        |     |    |--!<endpoint>
529	        |     |    |      |--<display-text>
530	        |     |    |      |--<referred>
531	        |     |    |      |--<status>
532	        |     |    |      |--<joining-method>
533	        |     |    |      |--<joining-info>
534	        |     |    |      |--<disconnection-method>
535	        |     |    |      |--<disconnection-info>
536	        |     |    |      |--<media>
537	        |     |    |      |    |--<type>
538	        |     |    |      |    |--<display-text>
539	        |     |    |      |    |--<label>
540	        |     |    |      |    |--<src-id>
541	        |     |    |      |    |--<status>
542	        |     |    |      |    |--<to-mixer>*
543	        |     |    |      |    |      |--<floor>*
544	        |     |    |      |    |      |--<controls>*
545	        |     |    |      |    |      |      |--<mute>*
546	        |     |    |      |    |      |      |--<gain>*
547	        |     |    |      |    |      |     ...
548	        |     |    |      |    |--<from-mixer>*
549	        |     |    |      |    |      |--<floor>*
550	        |     |    |      |    |      |--<controls>*
551	        |     |    |      |    |      |      |--<pause-video>*
552	        |     |    |      |    |      |     ...
553	        |     |    |      |   ...
554	        |     |    |      |--<call-info>
555	        |     |    |      |    |--<sip>
556	        |     |    |      |    |   |--<display-text>
557	        |     |    |      |    |   |--<call-id>
558	        |     |    |      |    |   |--<from-tag>
559	        |     |    |      |    |   |--<to-tag>
560	        |          ...    ...
561	        |--<sidebars-by-ref>
562	        |     |--<entry>
563	        |     |     |-- <user>
564	        |     |     |-- <display-text>
565	        |     |--<entry>
566	        |     |     |-- <user>
567	        |     |     |-- <display-text>
568	        |     ...
569	        |--<sidebars-by-val>
570	        |     |--<entry>
571	        |     |     |
572	        |     |    ...
573	        |     |--<entry>
574	        |     |     |
575	        |     ...   ...

577	                      Figure 3: Non-normative diagram

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

582	4.1.  <conference-info>

584	   A conference object document begins with the root element tag
585	   <conference-info>, which is defined in [RFC4575].  The <conference-
586	   info> attributes are described in [RFC4575].  Note that the
587	   <conference-info> element does not have the attributes 'state' and
588	   'version' defined in [RFC4575] for this element because these
589	   attributes only apply to notification mechanisms.

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

595	   The <conference-info> element contains the <conference-description>,
596	   <host-info>, <conference-state>, <floor-information>, <users>,
597	   <sidebars-by-ref>, and <sidebars-by-val> child elements.  All these
598	   elements, except <floor-information>, are defined in [RFC4575].  A
599	   conference document MUST at least include the <conference-
600	   description> and <users> child elements.

602	4.2.  <conference-description>

604	   The <conference-description> element, which is defined in [RFC4575],
605	   describes the conference as a whole.  It should have an extra
606	   attribute 'lang' to specify the language used in the contents of this
607	   element.  It is comprised of <language>, <display-text>, <subject>,
608	   <free-text>, <keywords>, <allow-sidebars>, <cloning-parent>,
609	   <sidebar-parent>, <conference-time>, <conf-uris>, <service-uris>,
610	   <maximum-user-count>, and <available-media>.

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

616	4.2.1.  <language>

618	   The <language> element indicates the predominant language that is
619	   expected to be employed within a conference.  The possible values of
620	   this element are the values of the 'Subtag' column of the [RFC5646]
621	   defined in IANA [IANA-Lan].  This element is not enforcing the
622	   language of the conference, but only informs the participants about
623	   the desirable language that they should use in the conference.
624	   Participants are free to switch to other languages if they like.

626	4.2.2.  <display-text>

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

630	4.2.3.  <subject>

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

634	4.2.4.  <free-text>

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

638	4.2.5.  <keywords>

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

642	4.2.6.  <allow-sidebars>

644	   The <allow-sidebars> element represents a boolean value.  If set to
645	   TRUE, the conference is allowed to create sidebar conferences.  If
646	   absent, or set to FALSE, the conference can not create sidebar
647	   conferences.

649	4.2.7.  <cloning-parent>

651	   When the <cloning-parent> is present, it indicates that the
652	   conference object is a child of a parent conference.  The <cloning-
653	   parent> element contains the conference object Identifier (XCON-URI)
654	   (different from the main XCON-URI) of the parent.

656	4.2.8.  <sidebar-parent>

658	   When the <sidebar-parent> is present, it indicates that the
659	   conference object represents a sidebar of another conference.  The
660	   <sidebar-parent> element contains the conference object Identifier
661	   (XCON-URI) (different from the main XCON-URI) of the parent.

663	4.2.9.  <conference-time>

665	   The <conference-time> element contains the information related to
666	   conference time, policy, and duration of a conference.  The
667	   <conference-time> element contains one or more <entry> elements each
668	   defining the time and policy information specifying a single
669	   conference occurrence.  The <conference-time> element differs from
670	   the iCalendar objects [RFC2445] in the possibility to defined
671	   different policies (<can-join-after-offset>, <must-join-before-
672	   offset>) for the same conference at different times.

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

676	   o  <base>: The <base> child element specifies the iCalendar object of
677	      the conference.  The iCalendar object components are defined in
678	      [RFC2445].
679	   o  <mixing-start-offset>: The <mixing-start-offset> child element
680	      specifies when the conference media mixing starts before the
681	      conference starts.  If the <mixing-start-offset> element is not
682	      present, it indicates that the conference media mixing starts
683	      immediately.  The <mixing-start-offset> has the mandatory
684	      'required-participant' attribute.  This attribute contains one of
685	      the following values: "none", "administrator", "moderator",
686	      "user", "observer", and "participant".  The roles semantic
687	      definition is out of the scope of this document and is subject to
688	      future policy documents.  More values can be specified in the
689	      future.  The 'required-participant' attribute allows a privileged
690	      user to define when media mixing starts based on the latter of the
691	      mixing start time, and the time the first participant arrives.  If
692	      the value is set to "none'", mixing starts according to the mixing
693	      start time.
694	   o  <mixing-end-offset>: The <mixing-end-offset> child element that
695	      specifies the time a conference media mixing stops after the
696	      conference stops.  If the <mixing-end-offset> element is not
697	      present, it indicates that the conference occurrence is not
698	      bounded.  The <mixing-end-offset> element has the mandatory
699	      'required-participant' attribute.  This attribute contains one of
700	      the following values: "none", "administrator", "moderator",
701	      "observer", "user", and "participant".  More values can be
702	      specified in the future.  The 'required-participant' attribute
703	      allows a privileged user to define when media mixing ends based on
704	      the earlier of the <mixing-end-offset>, and the time the last
705	      participant leaves.  If the value is set to "none", mixing stops
706	      according to the <mixing-end-offset>.  If the conference policy
707	      was modified so that last privileged user is now a normal
708	      conference participant, and the conference requires a privileged
709	      user to continue; that conference MUST terminate.
710	   o  <can-join-after-offset>: An administrator can indicate the time
711	      when users can join a conference by populating the <can-join-
712	      after-offset> element.
713	   o  <must-join-before-offset>: An administrator can define the time
714	      after which new users are not allowed to join the conference
715	      anymore.
716	   o  <request-user>: It is possible to define the time when users or
717	      resources on the <allowed-users-list> are requested to join the
718	      conference by using the <request-users> element.
719	   o  <notify-end-of-conference>: The <notify-end-of-conference> element
720	      defines in seconds when the system has to send a notification when
721	      the end of the conference is approaching.  If the <notify-end-of-
722	      conference> element is not present, it indicates that the system
723	      does not notify the users when the end of the conference is
724	      approaching.
725	   o  <allowed-extend-mixing-end-offset>: The <allowed-extend-mixing-
726	      end-offset> refers to the possibility to extend the conference.
727	      It has a boolean value.

729	4.2.10.  <conf-uris>

731	   The <conf-uris> contains the identifiers to be used in order to
732	   access the conference by different signaling means.  This document
733	   describes a new element, <conference-password>.  This element
734	   contains the password(s) of the conference, for instance, PSTN
735	   conference will store the 'PIN code' in this element.  All the other
736	   <conf-uris> child element are described in section 5.3.1 of
737	   [RFC4575].  Future extensions to this schema may define new values
738	   and register them with IANA.

740	4.2.11.  <service-uris>

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

747	4.2.12.  <maximum-user-count>

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

754	4.2.13.  <available-media>

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

762	   o  The <type> element is described in section 5.3.4 of [RFC4575].
763	   o  The <display-text> element is described in section 5.3.4 of
764	      [RFC4575].
765	   o  The <status> element is described in section 5.3.4 of [RFC4575].
766	   o  The child element <mixing-mode> describes a default scheduling
767	      policy by which the mixer will build the outgoing stream from the
768	      incoming streams.  Note that this policy is different than the
769	      policy describing the floors for each media.  The <mixing-mode>
770	      child element MUST contain one and only one of the "Moderator-
771	      controlled", "FCFS", and "Automatic" values indicating the default
772	      algorithm to use with every media stream.  The "Moderator-
773	      controlled" value indicates that the moderator of the conference,
774	      controls the media stream policy.  The "FCFS" value indicates a
775	      'first-come-first-served' policy.  The "Automatic" value means the
776	      mixer choose the best scheduling policy for the conference.

778	   o  The <codecs> element specifies the allowed codecs in the
779	      conference.  It has an attribute 'decision' that specifies if the
780	      focus decides the common codec automatically or needs the approval
781	      of the moderator of the conference ("automatic", "moderator-
782	      controlled").  The <codecs> element contains <codec> elements.  A
783	      <codec> element can have the attribute 'name' and 'policy'.  The
784	      'name' attribute is a codec identifier assigned by the
785	      conferencing server.  The 'policy' attribute contains the policy
786	      for that codec (allowed, or disallowed).  The <codec> element has
787	      the child element <subtype> which stores the codec's name.  The
788	      possible values of this element are the values of the 'subtype'
789	      column of the RTP Payload Format media types per [RFC4855] defined
790	      in IANA [IANA].  It is expected that future conferencing
791	      specifications will define corresponding schema extensions, as
792	      appropriate.
793	   o  The <controls> element contains the basic audio and video global
794	      control elements for a conference.  It is expected that for the
795	      majority of the basic conferences, these controls are sufficient.
796	      If the conference server wants to support more advanced controls,
797	      then it is recommended that an extension to the data model be
798	      used.  In the <controls> element the schema is extensible, hence
799	      new control types can be added in the future.  So moderator
800	      controls that affect all media output would go under the
801	      <available-media> element.  The following controls elements are
802	      defined for <controls>:
803	      *  The <mute> element is used in conjunction with an audio stream
804	         to cease transmission of associated media.  That means that for
805	         the entire duration where mute is applicable, all current and
806	         future participants of the conference are muted and will not
807	         receive any audio.  It has a "boolean" value.  If this control
808	         is not specified, access to the control is not available to the
809	         client.
810	      *  The <pause-video> element is used in conjunction with a video
811	         stream to cease transmission of associated media.  It has a
812	         "boolean" value.  If this control is not specified, the access
813	         to the control is not available to the client.
814	      *  The <gain> element is used in conjunction with a media output
815	         stream to indicate the amount of amplification of an audio
816	         stream.  The value is an integer number that ranges from -127
817	         to 127.  If this control is not specified, access to the
818	         control is not available to the client.
819	      *  The <video-layout> element is used in conjunction with a video
820	         stream to specify how the video streams (of participants) are
821	         viewed by each participant.  Only one layout type can be
822	         specified for each output stream.  If there are fewer
823	         participants than panels in the specified layout, then blanking
824	         (black screen) MAY be mixed into the stream on the behalf of
825	         the missing input streams.  If unspecified, the <video-layout>
826	         default type SHOULD be "single-view".  The <video-layout> types
827	         are as follows, although any number of custom layouts may be
828	         specified in future extensions:
829	         +  single-view: Only one stream is presented by the focus to
830	            all participants in one panel.
831	         +  dual-view: This dual view option will present the video
832	            side-by-side in 2 panels and not alter the aspect ratio of
833	            the streams.  This will require the focus to introduce
834	            blanking on parts of the overall image as viewed by the
835	            participants.
836	         +  dual-view-crop: This side-by-side layout option instructs
837	            the focus to alter the aspect ratio of the streams (alter-
838	            aspect-ratio=TRUE) so that blanking is not necessary.  The
839	            focus handles the cropping of the streams.
840	         +  dual-view-2x1: This layout option instructs the focus to
841	            place one stream above the other, in essence with two rows
842	            and one column.  In this option the aspect ratio is not
843	            altered and blanking is introduced.
844	         +  dual-view-2x1-crop: This layout option also instructs the
845	            focus to place one stream above the other, in essence with
846	            two rows and one column.  In this option the aspect ratio is
847	            altered and the video streams are cropped.
848	         +  quad-view: Four equal-sized panels in a 2x2 layout is
849	            presented by the focus to all participants.  Typically the
850	            aspect ratio of the streams are maintained (alter-aspect-
851	            ratio= FALSE).
852	         +  multiple-3x3: Nine equal-sized panels in a 3x3 layout is
853	            presented by the focus to all participants.  Typically the
854	            aspect ratio of the streams are preserved.
855	         +  multiple-4x4: Sixteen equal-sized panels in a 4x4 layout is
856	            presented by the focus to all participants.  Typically the
857	            aspect ratio of the streams are preserved.
858	         +  multiple-5x1: This option refers to a 5x1 layout where one
859	            panel will occupy 4/9 of the mixed video stream while the
860	            others will each occupy 1/9 of the stream.  Typically the
861	            aspect ratio of the streams is preserved.
862	         +  automatic: This option allows the focus to add panels as
863	            streams are added.

865	4.3.  <host-info>

867	   The <host-info> element contains information about the entity hosting
868	   the conference.  This information is set before conference
869	   activation, and is rarely changed during the conference lifetime.
870	   The <host-info> element and its child elements are described in
871	   [RFC4575], section 5.4.  Future extensions to the <host-info> element
872	   may define new values.

874	4.4.  <conference-state>

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

880	4.4.1.  <allow-conference-event-subscription>

882	   The <allow-conference-event-subscription> element represents a
883	   boolean action.  If set to TRUE, the focus is instructed to allow the
884	   subscription to conference state events, such as 'SIP Event Package
885	   for Conference State' [RFC4575].  If set to FALSE, the subscription
886	   to conference state events would be rejected.  If this element is
887	   undefined it has a default value of TRUE, causing the subscription to
888	   conference state events to be accepted.

890	4.4.2.  <user-count>

892	   The <user-count> child element is explained in [RFC4575], section
893	   5.5.1.

895	4.4.3.  <active>

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

899	4.4.4.  <locked>

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

903	4.5.  <floor-information>

905	   The <floor-information> element contains the <conference-ID>, <allow-
906	   floor-events>, <floor-request-handling>, and <conference-floor-
907	   policy> child elements.  Other elements from different namespaces MAY
908	   be present for the purposes of extensibility.  The absence of this
909	   element from an XML document indicates that the conference does not
910	   have a floor.

912	4.5.1.  <conference-ID>

914	   The <conference-ID> represents a conference instance within floor
915	   control.  When created within the conferencing system, the
916	   'conference-ID' can be represented by the unique conference object
917	   Identifier (XCON-URI).  When BFCP serves as the floor control
918	   protocol, the <conference-ID> is a 32-bit BFCP conference identifier
919	   defined in [RFC4582] section 5.1 and there is a 1:1 mapping to the
920	   XCON-URI.

922	4.5.2.  <allow-floor-events>

924	   The <allow-floor-events> element represents a boolean action.  If set
925	   to TRUE, the focus is instructed to accept the subscription to floor
926	   control events.  If set to FALSE, the focus is instructed to reject
927	   the subscription.  If this element is undefined, it has a default
928	   value of FALSE, causing the subscription to floor control events to
929	   be rejected.

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

939	4.5.3.  <floor-request-handling>

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

946	   o  "block": This action instructs the focus to deny the floor
947	      request.  This action is the default action taken in the absence
948	      of any other actions.
949	   o  "confirm": This action instructs the focus to allow the request.
950	      The focus then uses the defined floor algorithm to further allow
951	      or deny the floor.  The algorithms used are outside the scope of
952	      this document.

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

959	4.5.4.  <conference-floor-policy>

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

967	   o  <media-label>: Every floor is identified for one or more mandatory
968	      <media-label> element.  If the <available-media> information is
969	      included in the conference document, the value of this element
970	      MUST be equal to the 'label' value of the corresponding media
971	      stream <entry> in the <available-media> container.  The number of
972	      those elements indicates how many floors the conference can have.
973	      A floor can be used for one or more media types;
974	   o  <algorithm>: A floor can be controlled using many algorithms; the
975	      mandatory <algorithm> element MUST be set to any of the
976	      "moderator-controlled", "FCFS" or "random" values indicating the
977	      algorithm.  The "Moderator-controlled" value indicates that the
978	      moderator of the conference controls the floor.  The "FCFS" value
979	      states for 'first-come-first-served' floor control.
980	   o  <max-floor-users>: The <max-floor-users> child element in the
981	      <floor> element is optional and, if present, dictates the maximum
982	      number of users who can have the floor at one time.
983	   o  <moderator-id>: The optional <moderator-id> indicates the 'User
984	      ID' of the moderator(s).  It MUST be set if the element
985	      <algorithm> is set to "Moderator-controlled" value.  When the
986	      floor is created within the conferencing system, the XCON-User
987	      identifier MAY be used as the moderator-id.  In the case of BFCP
988	      as the floor control protocol, the <moderator-id> is defined in
989	      [RFC4582] section 3.  Note that [RFC4582] refers to the moderator
990	      role as a 'floor chair'.

992	4.6.  <users>

994	   The <users> element is described in [RFC4575] and contains the <join-
995	   handling>, <user-admission-policy>, <allowed-users-list> and <deny-
996	   users-list> defined in this document and <user> child elements
997	   defined in [RFC4575].  Note that the <users> element does not have
998	   the attribute 'state' defined in [RFC4575] for this element because
999	   this attribute only applies to notifications mechanism.  The
1000	   following sections describe these elements in more detail.  Other
1001	   child elements and attributes can be used to extend <users> in the
1002	   future.

1004	4.6.1.  <join-handling>

1006	   The <join-handling> element defines the actions used by the
1007	   conference focus to control conference participation.  This element
1008	   defines the action that the focus is to take when processing a
1009	   particular request to join a conference.  This element defines values
1010	   of:
1011	   o  "block": This action instructs the focus to deny access to the
1012	      conference.  This action is the default action taken in the
1013	      absence of any other actions.
1014	   o  "confirm": This action instructs the focus to place the
1015	      participant on a pending list (e.g., by parking the call on a
1016	      music-on-hold server), awaiting moderator input for further
1017	      actions.

1019	   o  "allow": This action instructs the focus to accept the conference
1020	      join request and grant access to the conference within the
1021	      instructions specified in the transformations of this rule.
1022	   o  "authenticate": This action instructs the focus that the user has
1023	      to provide a combination of username/password.
1024	   o  "directed-operator": This action instructs the focus to direct the
1025	      user to an operator.

1027	4.6.2.  <user-admission-policy>

1029	   The <user-admission-policy> is an element that lets an organizer (or
1030	   a participant with appropriate rights) choose a policy for the
1031	   conference that controls how users are authenticated into the
1032	   conference, using a mechanism of the conference's choosing.  Since a
1033	   variety of signaling protocols are possible, a variety of
1034	   authentication mechanism - determined by every individual conference
1035	   servers - may need to be mapped from the different protocols.  The
1036	   specific types of authentication mechanism are beyond the scope of
1037	   this document.  The list of possible values are:

1039	   o  "closedAuthenticated": A 'closedAuthenticated' policy requires
1040	      each conference participant to be in the allowed users list
1041	      (listed under the <allowed-users-list> XML element) with each
1042	      participant being sufficiently (up to local policy) authenticated.
1043	      Conference join requests for users not in the allowed users list
1044	      or participants not authenticated should be rejected unless a
1045	      <join-handling> action of 'confirm' is selected in which case the
1046	      user is placed on a pending list as indicated earlier.
1047	   o  "openAuthenticated": An 'openAuthenticated' policy requires each
1048	      conferencing participant to be sufficiently authenticated (as
1049	      before) but does not restrict which participants can join the
1050	      conference.  Typically this implies that anyone capable of
1051	      authenticating with the conferencing system may join the
1052	      conference.
1053	   o  "anonymous": An 'anonymous' policy allows any join requests in and
1054	      is the least restrictive policy.

1056	4.6.3.  <allowed-users-list>

1058	   The <allowed-users-list> child element contains a list of user URIs
1059	   (e.g.  SIP URI, xcon-userid defined in Section 4.6.5), roles (defined
1060	   in Section 4.6.5.4), or domains (e.g.: *@example.com) that the focus
1061	   uses to determine who can join the conference, who can be invited to
1062	   join a conference, or who the focus needs to "refer to" the
1063	   conference.  The <allowed-users-list> element includes zero or more
1064	   <target> child elements.  This child element includes the mandatory
1065	   'uri' attribute and the mandatory 'method' attribute.  The same 'uri'
1066	   attribute with different method values can appear in the list more
1067	   than once.

1069	   The 'method' attribute is a list with the following values:

1071	   o  "dial-in": The value "dial-in" is used by the focus to determine
1072	      who can join the conference.
1073	   o  "dial-out": The value "dial-out" contains a list of resources that
1074	      the focus will initiate a session with.
1075	   o  "refer": The value "refer" is used by the focus to determine the
1076	      resources that the focus needs to "refer to" the conference.  In
1077	      SIP, this is achieved by the focus sending a REFER request to
1078	      those potential participants.  In a different paradigm, this could
1079	      also mean that the focus sends an SMS or an email to the referred
1080	      user.  This list can be updated during the conference lifetime so
1081	      it can be used for mid-conference refers as well.

1083	   The "refer" value differs from the "dial-out" in that the resources
1084	   on the "refer" value are expected to initiate the session
1085	   establishment toward the focus themselves.  It is also envisioned
1086	   that different users will have different access rights to those lists
1087	   and therefore a separation between the two is needed.

1089	   The <allowed-users-list> element has a <persistent-list> child
1090	   element as well.  Some chatroom systems allow -- and some require --
1091	   registration of detailed information about a user before they are
1092	   allowed to join a chatroom.  The <persistent-list> child element
1093	   stores persistent information about users who are not actively part
1094	   of an ongoing chatroom session.  The <persistent-list> element stores
1095	   the following information:

1097	   o  user: The <user> element stores the name, nickname, the conference
1098	      user identifier (XCON-USERID) and email address of a user.  It has
1099	      three attributes: 'name', 'nickname' and 'id' and an <email>
1100	      element.  Future extensions to this schema may define new elements
1101	      for the <user> element.

1103	   Future extensions to this schema may define new elements for the
1104	   <target> element.

1106	4.6.4.  <deny-users-list>

1108	   The <deny-users-list> child element contains a list of user URIs
1109	   (e.g.  SIP URI, xcon-userid defined in Section 4.6.5), roles (defined
1110	   in Section 4.6.5.4), or domains (e.g.: *@example.com) that the focus
1111	   uses to determine who has been 'banned' from the conference.  Such
1112	   banned users are prevented from re-joining the chatroom until they
1113	   have been un-banned.

1115	4.6.5.  <user> and Its <user> Sub-elements

1117	   The element <user> is described in [RFC4575] and describes a single
1118	   participant in the conference.  The <user> element has an attribute
1119	   'entity'.  Note that the <user> element does not have the attribute
1120	   'state' defined in [RFC4575] for this element because this attribute
1121	   only applies to notifications mechanism.

1123	   The attribute 'entity' contains a unique conference user identifier
1124	   (XCON-USERID) within the scope of the conference.  The URI format of
1125	   this identifier is as follow:

1127	    XCON-USERID = "xcon-userid" ":" conf-user-id

1129	    conf-user-id = 1*(unreserved)

1131	   [unreserved is defined in RFC3986]

1133	   Other user identifiers can be associated with this conference user
1134	   identifier and enable the conferencing system to correlate and map
1135	   these multiple authenticated user identities to a single global user
1136	   identifier.  Figure 4 illustrates an example using the conference
1137	   user identifier in association with the user identity defined for
1138	   BFCP, SIP, and H323 user identity.  It should be noted that a
1139	   conferencing system is free to structure such relationships as
1140	   required and this information is just included as a guideline that
1141	   can be used.

1143	                         +----------------+
1144	                         |   Conference   |
1145	                         |      User      |
1146	                         |   Identifier   |
1147	                         +----------------+
1148	                         |xcon-userid:John|
1149	                         +-------+--------+
1150	                                 |
1151	                                 |
1152	                                 |
1153	          +----------------------+-------------------------+
1154	          |                      |                         |
1155	  +-------+--------+ +-----------+-----------+ +-----------+-----------+
1156	  |  BFCP User ID  | |      SIP User URI     | |     H323 User URI     |
1157	  +----------------+ +-----------------------+ +-----------------------+
1158	  |      543       | |sip:851221@example.com | |h323:taeduk@example.com|
1159	  +----------------+ +-----------------------+ +-----------------------+
1160	                     Figure 4: Conference User Mapping

1162	   The element <user> element contains the <display-text>, <associated-
1163	   aors>, <provide-anonymity>, <roles>, <languages>, <cascaded-focus>,
1164	   <allow-refer-users-dynamically>, <allow-invite-users-dynamically>,
1165	   <allow-remove-users-dynamically>, and <endpoint>.  The following
1166	   sections describe these elements in more detail.

1168	4.6.5.1.  <display-text>

1170	   The <display-text> child element is explained in [RFC4575], section
1171	   5.6.1.

1173	4.6.5.2.  <associated-aors>

1175	   The <associated-aors> child element is explained in [RFC4575],
1176	   section 5.6.2.

1178	4.6.5.3.  <provide-anonymity>

1180	   The <provide-anonymity> element specifies what level of anonymity the
1181	   server should provide to the user.  In this case, the focus provides
1182	   to the rest of the participants an anonymous identity for that user,
1183	   for example anonymousX, or it does not provide any information for
1184	   that user such that other users can not see he is a participant in
1185	   the conference.  This element only affects the way the user
1186	   information is provided to the other participants.  The real
1187	   information about the user is still stored in the data model.  This
1188	   can be achieved by using the <provide-anonymity> element.  This
1189	   element has three values: 'private', 'semi-private' and 'hidden'.
1190	   The 'private' value specifies that this user is completely anonymous
1191	   in the conference. 'semi-private' value specifies that this user is
1192	   anonymous to all users with equal or lesser permissions in the
1193	   conference. 'hidden' value specifies that other users can not see
1194	   this participant in the conference.

1196	4.6.5.4.  <roles>

1198	   A role provides the context for the set of conference operations that
1199	   a participant can perform.  This element can contain one of the
1200	   following values: "administrator", "moderator", "user",
1201	   "participant", "observer", and "none".  The roles semantic definition
1202	   is out of the scope of this document and is subject to future policy
1203	   documents.  This element can be extended with new roles in future
1204	   documents.

1206	4.6.5.5.  <languages>

1208	   The <languages> child element is explained in [RFC4575], section
1209	   5.6.4.

1211	4.6.5.6.  <cascaded-focus>

1213	   The <cascaded-focus> child element is explained in [RFC4575], section
1214	   5.6.5.

1216	4.6.5.7.  <allow-refer-users-dynamically>

1218	   The <allow-refer-users-dynamically> element represents a boolean
1219	   value.  If set to TRUE, a participant is allowed to instruct the
1220	   focus to refer a user to the conference without modifying the
1221	   <allowed-users-list> (in SIP terms, a participant is allowed to send
1222	   a REFER request to the focus which results in the focus sending a
1223	   REFER request to the user the referrer wishes to join the
1224	   conference).  If set to FALSE, the refer request is rejected.  If
1225	   this element is undefined it has a value of FALSE, causing the refer
1226	   to be rejected.

1228	4.6.5.8.  <allow-invite-users-dynamically>

1230	   The <allow-invite-users-dynamically> element represents a boolean
1231	   action.  If set to TRUE, a participant is allowed to instruct the
1232	   focus to invite a user to the conference without modifying the
1233	   <allowed-users-list> list (in SIP terms, a participant is allowed to
1234	   send a REFER request to the focus which results in the focus sending
1235	   an INVITE request to the user the referrer wishes to join the
1236	   conference).  If set to FALSE, the refer request is rejected.  If
1237	   this element is undefined it has a value of FALSE, causing the refer
1238	   to be rejected.

1240	4.6.5.9.  <allow-remove-users-dynamically>

1242	   The <allow-remove-users-dynamically> element represents a boolean
1243	   action.  If set to TRUE, a participant is allowed to instruct the
1244	   focus to remove a user from the conference without modifying the
1245	   ruleset (in SIP terms, a participant is allowed to send a REFER
1246	   request to the focus which results in the focus sending an BYE
1247	   request to the user the referrer wishes to leave the conference).  If
1248	   set to FALSE, the refer request is rejected.  If this element is
1249	   undefined it has a value of FALSE, causing the refer to be rejected.

1251	4.6.5.10.  <endpoint>

1253	   The <endpoint> child element is defined in [RFC4575].  It can provide
1254	   the desired level of detail about the user's devices and their
1255	   signaling sessions taking part in the conference.  The <endpoint>
1256	   element in this document does not defined the 'state' attribute
1257	   defined in [RFC4575] for the same element since the 'state' attribute
1258	   only applies to notification mechanisms.

1260	   The <endpoint> element has the following child elements: <display-
1261	   text>, <referred>, <status>, <joining-method>, <joining-info>,
1262	   <disconnection-method>, <disconnection-info>, <media>, <floor>,and
1263	   <call-info>.  All the <endpoint> child elements are defined in
1264	   [RFC4575] with the exception of the <floor> element.

1266	   The <floor> element refers to the floor assigned to a certain
1267	   participant in the conference.  If a participant, for instance, needs
1268	   to talk in the conference, it first needs to get the floor from the
1269	   chair of the conference.  The <floor> element has an attribute 'id'
1270	   which uniquely identifies a floor or floors within a conference.  The
1271	   'id' attribute corresponds to the floor-id identifier defined in
1272	   [RFC4582] section 5.2.2.  The <floor> element has a "Boolean" value.
1273	   A value of FALSE indicates that this user does not hold the floor in
1274	   this moment.  If this control is not specified, this user SHOULD NOT
1275	   specify the floor option.

1277	   Besides the <floor> element, the <endpoint>/<media> element has two
1278	   other child elements defined in this document, the <to-mixer>, and
1279	   the <from-mixer>:

1281	   o  <from-mixer>, <to-mixer>: These are controls that apply to a
1282	      user's media stream being sent from the mixer to the participants
1283	      endpoint or to the mixer from the participants endpoint.  The <to-
1284	      mixer> element details properties associated with the incoming
1285	      streams to the mixer (streams sent to the mixer from the
1286	      participant).  The <from-mixer> element details properties
1287	      associated with the outgoing streams from the mixer (sent from the
1288	      mixer to the participant).  Both of these elements have the
1289	      attribute 'name'.  The 'name' attribute has the values "VideoIn",
1290	      "VideoOut", "AudioOut", and "AudioIn".  The "VideoOut" and
1291	      "AudioOut" media streams detail properties associated with the
1292	      outgoing video and audio from the mixer.  The "VideoIn" and
1293	      "AudioIn" media stream details properties associated with the
1294	      incoming video and audio to the mixer.  More values can be defined
1295	      in the future.  The <to-mixer> and <from-mixer> elements have the
1296	      <controls> child element:

1298	      *  Controls that apply to a specific user would appear under the
1299	         <controls> element.

1301	4.7.  <sidebars-by-ref>

1303	   The <sidebars-by-ref> element contains a set of <entry> child
1304	   elements.  This element is described in [RFC4575], 5.9.1.  Note that
1305	   the <sidebars-by-ref> element does not have the attribute 'state'
1306	   defined in [RFC4575] for this element because this attribute only
1307	   applies to notifications mechanism.

1309	4.8.  <sidebars-by-val>

1311	   The <sidebars-by-val> element contains a set of <entry> child
1312	   elements each containing information about a single sidebar.  This
1313	   element is described in [RFC4575], 5.9.2.  Note that the <sidebars-
1314	   by-val> element does not have the attribute 'state' defined in
1315	   [RFC4575] for this element because this attribute only applies to
1316	   notifications mechanism.

1318	5.  RELAX NG Schema

1320	   In accordance with the Centralized Conferencing Framework document
1321	   [RFC5239], the Conference Object is a logical representation of a
1322	   conference instance.  The conference information schema contains core
1323	   information that is utilized in any conference.  It also contains the
1324	   variable information part of the Conference Object.

1326	   The normative schema is backwards compatible with the [RFC5239], in
1327	   other words, valid [RFC5239] instance documents are also valid
1328	   according to this RELAX NG schema [RELAX].  In addition to
1329	   approximately similar RELAX NG [RELAX] definitions of the [RFC5239],
1330	   this schema contains extension elements in the
1331	   "urn:ietf:params:xml:ns:xcon-conference-info" namespace.

1333	 default namespace = "urn:ietf:params:xml:ns:conference-info"
1334	 namespace xcon = "urn:ietf:params:xml:ns:xcon-conference-info"

1336	 start = element conference-info { conference-type }
1337	 # CONFERENCE TYPE
1338	 conference-type =
1339	   attribute entity { text }
1340	   & anyAttribute
1341	   & conference-description-type?
1342	   & element host-info { host-type }?
1343	   & element conference-state { conference-state-type }?
1344	   & element users { users-type }?
1345	   & element sidebars-by-ref { uris-type }?
1346	   & element sidebars-by-val { sidebars-by-val-type }?
1347	   & element xcon:floor-information { floor-information-type }?
1348	   & anyElement*
1349	 # CONFERENCE DESCRIPTION TYPE
1350	 conference-description-type =
1351	   element conference-description {
1352	     attribute xml:lang { xsd:language }?
1353	     & anyAttribute
1354	     & element display-text { text }?
1355	     & element subject { text }?
1356	     & element free-text { text }?
1357	     & element keywords {
1358	         list { xsd:string* }
1359	       }?
1360	     & element conf-uris { uris-type }?
1361	     & element service-uris { uris-type }?
1362	     & element maximum-user-count { xsd:int }?
1363	     & element available-media { conference-media-type }?
1364	     & element xcon:language { xsd:language }?
1365	     & element xcon:allow-sidebars { xsd:boolean }?
1366	     & element xcon:cloning-parent { xsd:anyURI }?
1367	     & element xcon:sidebar-parent { xsd:anyURI }?
1368	     & element xcon:conference-time { conferencetime-type }?
1369	     & anyElement*
1370	   }
1371	 # HOST TYPE
1372	 host-type =
1373	   element display-text { text }?
1374	   & element web-page { xsd:anyURI }?
1375	   & element uris { uris-type }?
1376	   & anyElement*
1377	   & anyAttribute
1378	 # CONFERENCE STATE TYPE
1379	 conference-state-type =
1380	   anyAttribute
1381	   & element user-count { xsd:unsignedInt }?
1382	   & element active { xsd:boolean }?
1383	   & element locked { xsd:boolean }?
1384	   & element xcon:allow-conference-event-subscription { xsd:boolean }?
1385	   & anyElement*
1386	 # CONFERENCE MEDIA TYPE
1387	 conference-media-type =
1388	   anyAttribute
1389	   & element entry { conference-medium-type }*
1390	   & anyElement*
1391	 # CONFERENCE MEDIUM TYPE
1392	 conference-medium-type =
1393	   attribute label { text }
1394	   & anyAttribute
1395	   & element display-text { text }?
1396	   & element type { text }?
1397	   & element status { media-status-type }?
1398	   & element xcon:mixing-mode { mixing-mode-type }?
1399	   & element xcon:codecs { codecs-type }?
1400	   & element xcon:controls { control-type }?
1401	   & anyElement*
1402	 # URIs TYPE
1403	 uris-type =
1404	   anyAttribute
1405	   & element entry { uri-type }*
1406	   & anyElement*
1407	 # URI TYPE
1408	 uri-type =
1409	   element uri { xsd:anyURI }
1410	   & element display-text { text }?
1411	   & element purpose { text }?
1412	   & element modified { execution-type }?
1413	   & element xcon:conference-password { text }*
1414	   & anyElement*
1415	   & anyAttribute
1416	 # USERS TYPE
1417	 users-type =
1418	   anyAttribute
1419	   & element user { user-type }*
1420	   & element xcon:join-handling { join-handling-type }?
1421	   & element xcon:user-admission-policy { user-admission-policy-type }?
1422	   & element xcon:allowed-users-list { allowed-users-list-type }?
1423	   & element xcon:deny-users-list { deny-user-list-type }?
1424	   & anyElement*
1425	 # USER TYPE
1426	 user-type =
1427	   attribute entity { xsd:anyURI }
1428	   & anyAttribute
1429	   & element display-text { text }?
1430	   & element associated-aors { uris-type }?
1431	   & element roles {
1432	       element entry { single-role-type }+
1433	     }?
1434	   & element languages {
1435	       list { xsd:language }
1436	     }?
1437	   & element cascaded-focus { xsd:anyURI }?
1438	   & element endpoint { endpoint-type }*
1439	   & element xcon:provide-anonymity { provide-anonymity-type }?
1440	   & element xcon:allow-refer-users-dynamically { xsd:boolean }?
1441	   & element xcon:allow-invite-users-dynamically { xsd:boolean }?
1442	   & element xcon:allow-remove-users-dynamically { xsd:boolean }?
1443	   & anyElement*
1444	 # ENDPOINT TYPE
1445	 endpoint-type =
1446	   attribute entity { text }
1447	   & anyAttribute
1448	   & element display-text { text }?
1449	   & element referred { execution-type }?
1450	   & element status { endpoint-status-type }?
1451	   & element joining-method { joining-type }?
1452	   & element joining-info { execution-type }?
1453	   & element disconnection-method { disconnection-type }?
1454	   & element disconnection-info { execution-type }?
1455	   & element media { media-type }*
1456	   & element call-info { call-type }?
1457	   & element xcon:floor {
1458	       attribute id { text },
1459	       anyAttribute,
1460	       xsd:boolean
1461	     }*
1462	   & anyElement*
1463	 # ENDPOINT STATUS TYPE
1464	 endpoint-status-type =
1465	   "pending"
1466	   | "dialing-out"
1467	   | "dialing-in"
1468	   | "alerting"
1469	   | "on-hold"
1470	   | "connected"
1471	   | "muted-via-focus"
1472	   | "disconnecting"
1473	   | "disconnected"
1474	   | free-text-extension
1475	 # JOINING TYPE
1476	 joining-type =
1477	   "dialed-in" | "dialed-out" | "focus-owner" | free-text-extension
1478	 # DISCONNECTION TYPE
1479	 disconnection-type =
1480	   "departed" | "booted" | "failed" | "busy" | free-text-extension
1481	 # EXECUTION TYPE
1482	 execution-type =
1483	   element when { xsd:dateTime }?
1484	   & element reason { text }?
1485	   & element by { xsd:anyURI }?
1486	   & anyAttribute
1487	 # CALL TYPE
1488	 call-type =
1489	   element sip { sip-dialog-id-type }
1490	   & anyElement*
1491	   & anyAttribute
1492	 # SIP DIALOG ID TYPE
1493	 sip-dialog-id-type =
1494	   element display-text { text }?
1495	   & element call-id { text }
1496	   & element from-tag { text }
1497	   & element to-tag { text }
1498	   & anyElement*
1499	   & anyAttribute
1500	 # MEDIA TYPE
1501	 media-type =
1502	   attribute id { xsd:int }
1503	   & anyAttribute
1504	   & element display-text { text }?
1505	   & element type { text }?
1506	   & element label { text }?
1507	   & element src-id { text }?
1508	   & element status { media-status-type }?
1509	   & element xcon:to-mixer { mixer-type }?
1510	   & element xcon:from-mixer { mixer-type }?
1511	   & anyElement*
1512	 # MEDIA STATUS TYPE
1513	 media-status-type =
1514	   "recvonly"
1515	   | "sendonly"
1516	   | "sendrecv"
1517	   | "inactive"
1518	   | free-text-extension
1519	 # SIDEBARS-BY-VAL TYPE
1520	 sidebars-by-val-type =
1521	   anyAttribute
1522	   & element entry { conference-type }*
1523	   & anyElement*
1524	 # CONFERENCE TIME
1525	 conferencetime-type =
1526	   anyAttribute
1527	   & element xcon:entry {
1528	       element xcon:base { text },
1529	       element xcon:mixing-start-offset {
1530	         time-type,
1531	         attribute required-participant { single-role-type },
1532	         anyAttribute
1533	       }?,
1534	       element xcon:mixing-end-offset {
1535	         time-type,
1536	         attribute required-participant { single-role-type },
1537	         anyAttribute
1538	       }?,
1539	       element xcon:can-join-after-offset { time-type }?,
1540	       element xcon:must-join-before-offset { time-type }?,
1541	       element xcon:request-user { time-type }?,
1542	       element xcon:notify-end-of-conference { xsd:int }?,
1543	       element xcon:allowed-extend-mixing-end-offset { xsd:boolean }?,
1544	       anyElement*
1545	     }*
1546	 # TIME TYPE
1547	 time-type = xsd:dateTime { pattern = ".+T.+Z.*" }
1548	 # SINGLE ROLE TYPE
1549	 single-role-type =
1550	   xsd:string "none"
1551	   | xsd:string "administrator"
1552	   | xsd:string "moderator"
1553	   | xsd:string "user"
1554	   | xsd:string "observer"
1555	   | xsd:string "participant"
1556	   | free-text-extension
1557	 # MIXING MODE TYPE
1558	 mixing-mode-type =
1559	   xsd:string "moderator-controlled"
1560	   | xsd:string "FCFS"
1561	   | xsd:string "automatic"
1562	   | free-text-extension
1563	 # CODECS TYPE
1564	 codecs-type =
1565	   attribute decision { decision-type }
1566	   & anyAttribute
1567	   & element xcon:codec { codec-type }*
1568	   & anyElement*
1569	 # CODEC TYPE
1570	 codec-type =
1571	   attribute name { text }
1572	   & attribute policy { policy-type }
1573	   & anyAttribute
1574	   & element xcon:subtype { text }?
1575	   & anyElement*
1576	 # DECISION TYPE
1577	 decision-type =
1578	   xsd:string "automatic"
1579	   | xsd:string "moderator-controlled"
1580	   | free-text-extension
1581	 # POLICY TYPE
1582	 policy-type =
1583	   xsd:string "allowed" | xsd:string "disallowed" | free-text-extension
1584	 # CONTROL TYPE
1585	 control-type =
1586	   anyAttribute
1587	   & element xcon:mute { xsd:boolean }?
1588	   & element xcon:pause-video { xsd:boolean }?
1589	   & element xcon:gain { gain-type }?
1590	   & element xcon:video-layout { video-layout-type }?
1591	   & anyElement*
1592	 # GAIN TYPE
1593	 gain-type = xsd:int { minInclusive = "-127" maxInclusive = "127" }
1594	 # VIDEO LAYOUT TYPE
1595	 video-layout-type =
1596	   xsd:string "single-view"
1597	   | xsd:string "dual-view"
1598	   | xsd:string "dual-view-crop"
1599	   | xsd:string "dual-view-2x1"
1600	   | xsd:string "dual-view-2x1-crop"
1601	   | xsd:string "quad-view"
1602	   | xsd:string "multiple-3x3"
1603	   | xsd:string "multiple-4x4"
1604	   | xsd:string "multiple-5x1"
1605	   | xsd:string "automatic"
1606	   | free-text-extension
1607	 # FLOOR INFORMATION TYPE
1608	 floor-information-type =
1609	   anyAttribute
1610	   & element xcon:conference-ID { xsd:unsignedLong }?
1611	   & element xcon:allow-floor-events { xsd:boolean }?
1612	   & element xcon:floor-request-handling { floor-request-type }?
1613	   & element xcon:conference-floor-policy { conference-floor-policy }?
1614	   & anyElement*
1615	 # FLOOR REQUEST TYPE
1616	 floor-request-type =
1617	   xsd:string "block" | xsd:string "confirm" | free-text-extension
1618	 # CONFERENCE FLOOR POLICY
1619	 conference-floor-policy =
1620	   anyAttribute
1621	   & element xcon:floor {
1622	       attribute id { text }
1623	       & anyAttribute
1624	       & element xcon:media-label { xsd:nonNegativeInteger }+
1625	       & element xcon:algorithm { algorithm-type }?
1626	       & element xcon:max-floor-users { xsd:nonNegativeInteger }?
1627	       & element xcon:moderator-id { xsd:nonNegativeInteger }?
1628	       & anyElement*
1629	     }+
1630	 # ALGORITHM POLICY
1631	 algorithm-type =
1632	   xsd:string "moderator-controlled"
1633	   | xsd:string "FCFS"
1634	   | xsd:string "random"
1635	   | free-text-extension
1636	 # USERS ADMISSION POLICY
1637	 user-admission-policy-type =
1638	   xsd:string "closedAuthenticated"
1639	   | xsd:string "openAuthenticated"
1640	   | xsd:string "anonymous"
1641	   | free-text-extension
1642	 # JOIN HANDLING TYPE
1643	 join-handling-type =
1644	   xsd:string "block"
1645	   | xsd:string "confirm"
1646	   | xsd:string "allow"
1647	   | xsd:string "authenticate"
1648	   | xsd:string "directed-operator"
1649	   | free-text-extension
1650	 # DENY USERLIST
1651	 deny-user-list-type =
1652	   anyAttribute
1653	   & element xcon:target {
1654	       attribute uri { xsd:anyURI },
1655	       anyAttribute
1656	     }*
1657	   & anyElement*
1658	 # ALLOWED USERS LIST TYPE
1659	 allowed-users-list-type =
1660	   anyAttribute
1661	   & element xcon:target { target-type }*
1662	   & element xcon:persistent-list { persistent-list-type }?
1663	   & anyElement*
1664	 # PERSISTENT LIST TYPE
1665	 persistent-list-type =
1666	   element xcon:user {
1667	     attribute name { text }
1668	     & attribute nickname { text }
1669	     & attribute id { text }
1670	     & anyAttribute
1671	     & element xcon:e-mail { text }*
1672	     & anyElement*
1673	   }*
1674	   & anyElement*
1675	 # TARGET TYPE
1676	 target-type =
1677	   attribute uri { xsd:anyURI },
1678	   attribute method { method-type },
1679	   anyAttribute
1680	 # METHOD TYPE
1681	 method-type =
1682	   xsd:string "dial-in"
1683	   | xsd:string "dial-out"
1684	   | xsd:string "refer"
1685	   | free-text-extension
1686	 # ANONYMITY TYPE
1687	 provide-anonymity-type =
1688	   "private" | "semi-private" | "hidden" | free-text-extension
1689	 # MIXER TYPE
1690	 mixer-type =
1691	   attribute name { mixer-name-type }
1692	   & anyAttribute
1693	   & element xcon:controls { control-type }*
1694	   & anyElement*
1695	 # MIXER NAME TYPE
1696	 mixer-name-type =
1697	   "VideoIn" | "VideoOut" | "AudioOut" | "AudioIn" | free-text-extension

1699	 # FREE TEXT EXTENSION
1700	 # (re-define this as <notAllowed>,
1701	 #  if extensions beyond this spec are not used)

1703	 free-text-extension = text

1705	 # *********************************
1706	 # EXTENSIBILITY OF THE SCHEMA
1707	 # *********************************

1709	 # EXTENSIBILITY ELEMENTS
1710	 # (re-define this as <empty/>,
1711	 #  if extensions beyond this spec are not used)

1713	 anyElement =
1714	   element * - (conference-description
1715	                | host-info
1716	                | conference-state
1717	                | users
1718	                | sidebars-by-ref
1719	                | sidebars-by-val
1720	                | display-text
1721	                | subject
1722	                | free-text
1723	                | keywords
1724	                | conf-uris
1725	                | service-uris
1726	                | maximum-user-count
1727	                | available-media
1728	                | web-page
1729	                | uris
1730	                | uri
1731	                | user-count
1732	                | active
1733	                | locked
1734	                | entry
1735	                | type
1736	                | status
1737	                | purpose
1738	                | modified
1739	                | user
1740	                | associated-aors
1741	                | roles
1742	                | languages
1743	                | cascaded-focus
1744	                | endpoint
1745	                | referred
1746	                | joining-method
1747	                | joining-info
1748	                | disconnection-method
1749	                | disconnection-info
1750	                | media
1751	                | call-info
1752	                | when
1753	                | reason
1754	                | by
1755	                | sip
1756	                | call-id
1757	                | from-tag
1758	                | to-tag
1759	                | label
1760	                | src-id
1761	                | xcon:conference-password
1762	                | xcon:mixing-mode
1763	                | xcon:codecs
1764	                | xcon:controls
1765	                | xcon:language
1766	                | xcon:allow-sidebars
1767	                | xcon:cloning-parent
1768	                | xcon:sidebar-parent
1769	                | xcon:allow-conference-event-subscription
1770	                | xcon:to-mixer
1771	                | xcon:provide-anonymity
1772	                | xcon:allow-refer-users-dynamically
1773	                | xcon:allow-invite-users-dynamically
1774	                | xcon:allow-remove-users-dynamically
1775	                | xcon:from-mixer
1776	                | xcon:join-handling
1777	                | xcon:user-admission-policy
1778	                | xcon:allowed-users-list
1779	                | xcon:deny-users-list
1780	                | xcon:floor-information
1781	                | xcon:conference-time
1782	                | xcon:provide-anonymity
1783	                | xcon:floor
1784	                | xcon:entry
1785	                | xcon:mixing-start-offset
1786	                | xcon:mixing-end-offset
1787	                | xcon:can-join-after-offset
1788	                | xcon:must-join-before-offset
1789	                | xcon:request-user
1790	                | xcon:notify-end-of-conference
1791	                | xcon:allowed-extend-mixing-end-offset
1792	                | xcon:codec
1793	                | xcon:subtype
1794	                | xcon:mute
1795	                | xcon:pause-video
1796	                | xcon:gain
1797	                | xcon:video-layout
1798	                | xcon:conference-ID
1799	                | xcon:allow-floor-events
1800	                | xcon:floor-request-handling
1801	                | xcon:conference-floor-policy
1802	                | xcon:media-label
1803	                | xcon:algorithm
1804	                | xcon:max-floor-users
1805	                | xcon:moderator-id
1806	                | xcon:target
1807	                | xcon:persistent-list
1808	                | xcon:e-mail
1809	                | xcon:user) { anyExtension }
1810	 anyExtension =
1811	   (attribute * { text }
1812	    | any)*
1813	 any =
1814	   element * {
1815	     (attribute * { text }
1816	      | text
1817	      | any)*
1818	   }

1820	 # EXTENSIBILITY ATTRIBUTES
1821	 # (re-define this as <empty/>,
1822	 #  if extensions beyond this spec are not used)

1824	 anyAttribute =
1825	   attribute * - (xml:lang
1826	                  | entity
1827	                  | required-participant
1828	                  | label
1829	                  | decision
1830	                  | name
1831	                  | policy
1832	                  | uri
1833	                  | method
1834	                  | id
1835	                  | nickname) { text }*

1837	6.  XML Schema Extensibility

1839	   The Conference Information Data Model defined in this document is
1840	   meant to be extensible toward specific application domains.  Such
1841	   extensions are accomplished by defining elements, child elements and
1842	   attributes that are specific to the desired application domain.  The
1843	   IETF MAY extend the data model schema with unqualified attributes or
1844	   extension elements from the "urn:ietf:params:xml:ns:" "sub-namespace"
1845	   in the future.  Other instances are free to define extension elements
1846	   or attributes under other namespaces.

1848	   Elements or attributes from unknown namespaces MUST be ignored.

1850	7.  XML Example

1852	   The following is an example of a conference information document.
1853	   The conference starts on October 17, 2007, at 10:30 AM in New York
1854	   City and finishes the same day at 12:30 PM every week.  In this
1855	   example, there are currently 3 participants in a conference, one
1856	   administrator, one moderator, and one participant.  Sidebars are
1857	   allowed in this conference and ,consequently, there is one sidebar in
1858	   the conference.  In addition, Alice and Carol are using a floor in
1859	   the main conference to manage the audio and video resources.  At the
1860	   moment, Alice is assigned to use the floor.

1862	<?xml version="1.0" encoding="UTF-8"?>
1863	<conference-info
1864	        xmlns="urn:ietf:params:xml:ns:conference-info"
1865	        xmlns:xcon="urn:ietf:params:xml:ns:xcon-conference-info"
1866	        entity="conference123@example.com">
1867	        <!--
1868	            CONFERENCE DESCRIPTION
1869	        -->
1870	        <conference-description xml:lang="en-us">
1871	            <display-text>Discussion of Formula-1 racing</display-text>
1872	            <subject>Sports:Formula-1</subject>
1873	            <free-text>This is a conference example</free-text>
1874	            <keywords>Formula-1 cars</keywords>
1875	            <!--
1876	                CONFERENCE UNIQUE IDENTIFIERS
1877	            -->
1878	            <conf-uris>
1879	                <entry>
1880	                    <uri>tel:+3585671234</uri>
1881	                    <display-text>Conference Bridge</display-text>
1882	                    <purpose>participation</purpose>
1883	                    <xcon:conference-password
1884	                     >5678</xcon:conference-password>
1885	                </entry>
1886	                <entry>
1887	                    <uri>http://www.example.com/live.ram</uri>
1888	                    <purpose>streaming</purpose>
1889	                </entry>
1890	            </conf-uris>
1891	            <!--
1892	                SERVICE URIS
1893	            -->
1894	            <service-uris>
1895	                <entry>
1896	                    <uri>mailto:bob@example.com</uri>
1897	                    <display-text>email</display-text>
1898	                </entry>
1899	            </service-uris>
1900	            <!--
1901	                MAXIMUM USER COUNT
1902	            -->
1903	            <maximum-user-count>50</maximum-user-count>
1904	            <!--
1905	                AVAILABLE MEDIA
1906	            -->
1907	            <available-media>
1908	                <entry label="10234">
1909	                    <display-text>main audio</display-text>
1910	                    <type>audio</type>
1911	                    <status>sendrecv</status>
1912	                    <xcon:mixing-mode>automatic</xcon:mixing-mode>
1913	                    <xcon:codecs decision="automatic">
1914	                        <xcon:codec name="122" policy="allowed">
1915	                           <xcon:subtype>PCMU</xcon:subtype>
1916	                        </xcon:codec>
1917	                    </xcon:codecs>
1918	                    <xcon:controls>
1919	                        <xcon:mute>true</xcon:mute>
1920	                        <xcon:gain>50</xcon:gain>
1921	                    </xcon:controls>
1922	                </entry>
1923	                <entry label="10235">
1924	                    <display-text>main video</display-text>
1925	                    <type>video</type>
1926	                    <status>sendrecv</status>
1927	                    <xcon:mixing-mode>automatic</xcon:mixing-mode>
1928	                    <xcon:codecs decision="automatic">
1929	                        <xcon:codec name="123" policy="allowed">
1930	                           <xcon:subtype>H.263</xcon:subtype>
1931	                        </xcon:codec>
1932	                    </xcon:codecs>
1933	                    <xcon:controls>
1934	                        <xcon:video-layout
1935	                          >single-view</xcon:video-layout>
1936	                    </xcon:controls>
1937	                </entry>
1938	            </available-media>

1940	            <xcon:language>En-us</xcon:language>

1942	            <xcon:allow-sidebars>true</xcon:allow-sidebars>
1943	            <!--
1944	                CONFERENCE TIME
1945	            -->

1947	            <xcon:conference-time>
1948	                <xcon:entry>
1949	                    <xcon:base>BEGIN:VCALENDAR
1950	  PRODID:-//LlamaSpinner Inc.//NONSGML CamelCall//EN
1951	  VERSION:2.0
1952	  BEGIN:VEVENT
1953	  DTSTAMP:20071003T140728Z
1954	  UID:20071003T140728Z-345FDA-carol@example.com
1955	  ORGANIZER:MAILTO:carol@example.com
1956	  DTSTART:20071017T143000Z
1957	  RRULE:FREQ=WEEKLY
1958	  DTEND:20071217T163000Z
1959	  END:VEVENT
1960	  END:VCALENDAR</xcon:base>
1961	                    <xcon:mixing-start-offset
1962	                        required-participant="moderator"
1963	                       >2007-10-17T14:29:00Z</xcon:mixing-start-offset>
1964	                    <xcon:mixing-end-offset
1965	                        required-participant="participant"
1966	                       >2007-10-17T16:31:00Z</xcon:mixing-end-offset>

1968	                    <xcon:must-join-before-offset
1969	                       >2007-10-17T15:30:00Z
1970	                       </xcon:must-join-before-offset>
1971	                </xcon:entry>
1972	            </xcon:conference-time>

1974	        </conference-description>
1975	        <!--
1976	            HOST INFO
1977	        -->
1978	        <host-info>
1979	            <display-text>Formula1</display-text>
1980	            <web-page>http://www.example.com/formula1/</web-page>
1981	            <uris>
1982	                <entry>
1983	                    <uri>sip:alice@example.com</uri>
1984	                </entry>
1985	                <entry>
1986	                    <uri>sip:carol@example.com</uri>
1987	                </entry>
1988	            </uris>
1989	        </host-info>
1990	        <!--
1991	            CONFERENCE STATE
1992	        -->
1993	        <conference-state>
1994	            <user-count>3</user-count>
1995	            <active>true</active>
1996	            <locked>false</locked>
1997	            <xcon:allow-conference-event-subscription
1998	              >true</xcon:allow-conference-event-subscription>

2000	       </conference-state>
2001	        <!--
2002	            USERS
2003	        -->
2004	        <users>
2005	            <!--
2006	                USER BOB
2007	            -->
2008	            <user entity="bob534">
2009	                <display-text>Bob Hoskins</display-text>
2010	                <associated-aors>
2011	                    <entry>
2012	                        <uri>mailto:bob@example.com</uri>
2013	                        <display-text>email</display-text>
2014	                    </entry>
2015	                </associated-aors>
2016	                <roles>
2017	                    <entry>participant</entry>
2018	                </roles>
2019	                <languages>en-us</languages>

2021	                <!--
2022	                    ENDPOINTS
2023	                -->
2024	                <endpoint entity="sip:bob@example.com">
2025	                    <display-text>Bob's Laptop</display-text>
2026	                    <referred>
2027	                        <when>2007-10-17T14:00:00Z</when>
2028	                        <reason>expert required</reason>
2029	                        <by>sip:alice@example.com</by>
2030	                    </referred>
2031	                    <status>connected</status>
2032	                    <joining-method>dialed-out</joining-method>
2033	                    <joining-info>
2034	                        <when>2007-10-17T14:00:00Z</when>
2035	                        <reason>invitation</reason>
2036	                        <by>sip:alice@example.com</by>
2037	                    </joining-info>
2038	                    <!--
2039	                        MEDIA
2040	                    -->
2041	                    <media id="1">
2042	                        <type>video</type>
2043	                        <label>10235</label>
2044	                        <src-id>432424</src-id>
2045	                        <status>sendrecv</status>
2046	                        <xcon:to-mixer name="VideoIn">
2047	                            <xcon:controls>
2048	                                <xcon:video-layout
2049	                                   >single-view</xcon:video-layout>
2050	                            </xcon:controls>
2051	                        </xcon:to-mixer>
2052	                    </media>
2053	                    <!--
2054	                        CALL INFO
2055	                    -->
2056	                    <call-info>
2057	                        <sip>
2058	                            <display-text>full info</display-text>
2059	                            <call-id>hsjh8980vhsb78</call-id>
2060	                            <from-tag>vav738dvbs</from-tag>
2061	                            <to-tag>8954jgjg8432</to-tag>
2062	                        </sip>
2063	                    </call-info>

2065	                </endpoint>
2066	                <xcon:provide-anonymity
2067	                 >semi-private</xcon:provide-anonymity>
2068	                 <xcon:allow-refer-users-dynamically
2069	                    >false</xcon:allow-refer-users-dynamically>
2070	                <xcon:allow-invite-users-dynamically
2071	                    >false</xcon:allow-invite-users-dynamically>
2072	                <xcon:allow-remove-users-dynamically
2073	                    >false</xcon:allow-remove-users-dynamically>
2074	            </user>

2076	            <!--
2077	                USER ALICE
2078	            -->
2079	            <user entity="alice334">
2080	                <display-text>Alice Kay</display-text>
2081	                <associated-aors>
2082	                    <entry>
2083	                        <uri>mailto:alice@example.com</uri>
2084	                        <display-text>email</display-text>
2085	                    </entry>
2086	                </associated-aors>
2087	                <roles>
2088	                    <entry>moderator</entry>
2089	                </roles>
2090	                <languages>en-us</languages>
2091	                <!--
2092	                    ENDPOINTS
2093	                -->
2094	                <endpoint entity="sip:alice@example.com">
2095	                    <display-text>Alice's Desktop</display-text>
2096	                    <status>connected</status>
2097	                    <joining-method>dialed-in</joining-method>
2098	                    <joining-info>
2099	                        <when>2007-10-17T13:35:08Z</when>
2100	                        <reason>invitation</reason>
2101	                        <by>sip:conference@example.com</by>
2102	                    </joining-info>
2103	                    <!--
2104	                        MEDIA
2105	                    -->
2106	                    <media id="1">
2107	                        <type>video</type>
2108	                        <label>10235</label>
2109	                        <src-id>432424</src-id>
2110	                        <status>sendrecv</status>
2111	                        <xcon:to-mixer name="VideoIn">
2112	                         <xcon:controls>
2113	                            <xcon:video-layout
2114	                              >single-view</xcon:video-layout>
2115	                         </xcon:controls>
2116	                        </xcon:to-mixer>
2117	                    </media>
2118	                    <media id="2">
2119	                        <type>audio</type>
2120	                        <label>10234</label>
2121	                        <src-id>532535</src-id>
2122	                        <status>sendrecv</status>
2123	                        <xcon:to-mixer name="AudioIn">
2124	                          <xcon:controls>
2125	                            <xcon:gain>50</xcon:gain>
2126	                          </xcon:controls>
2127	                        </xcon:to-mixer>
2128	                        <xcon:from-mixer name="AudioOut">
2129	                          <xcon:controls>
2130	                              <xcon:gain>50</xcon:gain>
2131	                          </xcon:controls>
2132	                        </xcon:from-mixer>
2133	                    </media>
2134	                    <!--
2135	                        CALL INFO
2136	                    -->
2137	                    <call-info>
2138	                        <sip>
2139	                            <display-text>full info</display-text>
2140	                            <call-id>truy45469123478</call-id>
2141	                            <from-tag>asd456cbgt</from-tag>
2142	                            <to-tag>3456jgjg1234</to-tag>
2143	                        </sip>
2144	                    </call-info>
2145	                    <xcon:floor id="345">true</xcon:floor>
2146	                </endpoint>
2147	                <xcon:provide-anonymity>private</xcon:provide-anonymity>
2148	                <xcon:allow-refer-users-dynamically
2149	                    >true</xcon:allow-refer-users-dynamically>
2150	                <xcon:allow-invite-users-dynamically
2151	                    >true</xcon:allow-invite-users-dynamically>
2152	                <xcon:allow-remove-users-dynamically
2153	                    >true</xcon:allow-remove-users-dynamically>
2154	            </user>

2156	            <!--
2157	                USER CAROL
2158	            -->
2159	            <user entity="carol233">
2160	                <display-text>Carol More</display-text>
2161	                <associated-aors>
2162	                    <entry>
2163	                        <uri>mailto:carol@example.com</uri>
2164	                        <display-text>email</display-text>
2165	                    </entry>
2166	                </associated-aors>
2167	                <roles>
2168	                    <entry>administrator</entry>
2169	                </roles>
2170	                <languages>en-us</languages>
2171	                <!--
2172	                    ENDPOINTS
2173	                -->
2174	                <endpoint entity="sip:carol@example.com">
2175	                    <display-text>Carol's Computer</display-text>
2176	                    <status>connected</status>
2177	                    <joining-method>dialed-in</joining-method>
2178	                    <joining-info>
2179	                        <when>2007-10-17T13:30:05Z</when>
2180	                        <reason>invitation</reason>
2181	                        <by>sip:conference@example.com</by>
2182	                    </joining-info>
2183	                    <!--
2184	                        MEDIA
2185	                    -->
2186	                    <media id="1">
2187	                        <type>video</type>
2188	                        <label>10235</label>
2189	                        <src-id>432424</src-id>
2190	                        <status>sendrecv</status>
2191	                        <xcon:to-mixer name="VideoIn">
2192	                            <xcon:controls>
2193	                                <xcon:video-layout
2194	                              >single-view</xcon:video-layout>
2195	                         </xcon:controls>
2196	                        </xcon:to-mixer>
2197	                    </media>
2198	                    <media id="2">
2199	                        <type>audio</type>
2200	                        <label>10234</label>
2201	                        <src-id>532535</src-id>
2202	                        <status>sendrecv</status>
2203	                        <xcon:to-mixer name="AudioIn">
2204	                            <xcon:controls>
2205	                                <xcon:gain>50</xcon:gain>
2206	                            </xcon:controls>
2207	                        </xcon:to-mixer>
2208	                        <xcon:from-mixer name="AudioOut">
2209	                            <xcon:controls>
2210	                                <xcon:gain>50</xcon:gain>
2211	                          </xcon:controls>
2212	                        </xcon:from-mixer>
2213	                    </media>
2214	                    <!--
2215	                        CALL INFO
2216	                    -->
2217	                    <call-info>
2218	                        <sip>
2219	                            <display-text>full info</display-text>
2220	                            <call-id>wevb12562321894</call-id>
2221	                            <from-tag>asw456wedf</from-tag>
2222	                            <to-tag>2365dfrt3497</to-tag>
2223	                        </sip>
2224	                    </call-info>

2226	                    <xcon:floor id="345">false</xcon:floor>
2227	                </endpoint>

2229	                <xcon:provide-anonymity>private</xcon:provide-anonymity>
2230	                <xcon:allow-refer-users-dynamically
2231	                    >true</xcon:allow-refer-users-dynamically>
2232	                <xcon:allow-invite-users-dynamically
2233	                    >true</xcon:allow-invite-users-dynamically>
2234	                <xcon:allow-remove-users-dynamically
2235	                    >true</xcon:allow-remove-users-dynamically>

2237	            </user>

2239	            <xcon:join-handling>allow</xcon:join-handling>
2240	            <xcon:user-admission-policy
2241	               >openAuthenticated</xcon:user-admission-policy>
2242	            <!--
2243	                ALLOWED USERS LIST
2244	            -->
2245	            <xcon:allowed-users-list>
2246	                <xcon:target uri="sip:bob@example.com"
2247	                    method="dial-out"/>
2248	                <xcon:target uri="sip:alice@example.com"
2249	                    method="dial-out"/>
2250	                <xcon:target uri="sip:carol@example.com"
2251	                    method="dial-out"/>
2252	                <xcon:target uri="sip:john@example.com"
2253	                    method="refer"/>
2254	            </xcon:allowed-users-list>
2255	            <!--
2256	                DENY USERS LIST

2258	            -->
2259	            <xcon:deny-users-list>
2260	                <xcon:target uri="sip:charlie@example.com"/>
2261	            </xcon:deny-users-list>
2262	        </users>
2263	        <!--
2264	            SIDEBARS BY REFERENCE
2265	        -->
2266	        <sidebars-by-ref>
2267	            <entry>
2268	                <uri>conf223</uri>
2269	                <display-text>private with Bob</display-text>
2270	            </entry>
2271	        </sidebars-by-ref>
2272	        <!--
2273	            SIDEBARS BY VALUE
2274	        -->
2275	        <sidebars-by-val>
2276	            <entry entity="conf223">
2277	                <users>
2278	                    <user entity="bob534"/>
2279	                    <user entity="carol233"/>
2280	                </users>
2281	            </entry>
2282	        </sidebars-by-val>
2283	        <!--
2284	            FLOOR INFORMATION
2285	        -->
2286	        <xcon:floor-information>
2287	            <xcon:conference-ID>567</xcon:conference-ID>
2288	            <xcon:allow-floor-events>true</xcon:allow-floor-events>
2289	            <xcon:floor-request-handling
2290	             >confirm</xcon:floor-request-handling>

2292	            <xcon:conference-floor-policy>
2293	                <xcon:floor id="345">
2294	                    <xcon:media-label>10234</xcon:media-label>
2295	                    <xcon:media-label>10235</xcon:media-label>
2296	                    <xcon:algorithm
2297	                     >moderator-controlled</xcon:algorithm>
2298	                    <xcon:max-floor-users>1</xcon:max-floor-users>
2299	                    <xcon:moderator-id>234</xcon:moderator-id>
2300	                </xcon:floor>
2301	            </xcon:conference-floor-policy>
2302	        </xcon:floor-information>

2304	    </conference-info>

2306	   Note that due to RFC formatting conventions, this documents splits
2307	   lines whose content would exceed 72 characters.  Two backslash
2308	   characters mark where line folding has taken place.  These
2309	   backslashes would not appear in the actual XML data model.

2311	8.  Security Considerations

2313	   There are numerous security considerations for this document.  This
2314	   section considers them.

2316	8.1.  Authentication, Access Control, and Integrity

2318	   Different conferencing protocols will support different types of
2319	   authentication mechanisms.  Since a variety of signaling protocols
2320	   are possible, a variety of authentication mechanism - determined by
2321	   every individual conference servers - may need to be mapped from the
2322	   different protocols.  The specific types of authentication mechanism
2323	   are beyond the scope of this document.

2325	   Futhermore, users may use different namespaces to access to a
2326	   conference.  So a mapping database has to specify the acceptable
2327	   range of namespace for a user.  It is RECOMMENDED that the mapping
2328	   database has integrity when it is established, the integrity has to
2329	   be protected, and the database has to be maintained to ensure changes
2330	   in namespaces are accurately reflected.  Doing so, users will not
2331	   access the same conference twice using a different namespace.

2333	   The security considerations for authentication (section 10.1)
2334	   described in the centralized conferencing framework [RFC4575] applies
2335	   to this document.  The focus must ensure that only authorized
2336	   entities are able to manipulate the data to access the information.

2338	8.2.  Confidentiality

2340	   Participants of a conference may not want to reveal some private
2341	   information to other users.  The Conference Information Data Model
2342	   contains sensitive data which should not be analyzed or given to
2343	   anyone.  Examples of potential attacks include eavesdropping or
2344	   illegal copying of sensitive information.  The protocols used for
2345	   manipulation and retrieval of sensitive conference information MUST
2346	   be able to provide confidentiality and integrity mechanism.
2347	   Confidentiality is provided through encryption.  Strong end-to-end
2348	   authentication and encryption can be done using public keys, and end-
2349	   to-end encryption can be done using private keys.  It is RECOMMENDED
2350	   that all the protocols that manipulated the conference information
2351	   data model implement TLS.

2353	9.  IANA Considerations

2355	9.1.  Relax NG Schema Registration

2357	  This specification registers a schema. The schema can be found
2358	  as the sole content of Section 5.

2360	     URI:  urn:ietf:params:xml:ns:xcon-conference-info

2362	     Registrant Contact: IETF XCON working group,
2363	        <xcon@ietf.org>, Oscar Novo
2364	        <Oscar.Novo@ericsson.com>

2366	     Relax NG Schema:  The Relax NG schema to be registered is contained
2367	        in Section 5.  Its first line is

2369	     namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"

2371	        and its last line is

2373	     disconnection-type = "departed" | "booted" | "failed" | "busy"

2375	9.2.  XML Namespace Registration
2376	   This section registers a new XML namespace.

2378	      URI:  urn:ietf:params:xml:ns:xcon-conference-info

2380	      Registrant Contact: IETF XCON working group,
2381	         <xcon@ietf.org>, Oscar Novo
2382	         <Oscar.Novo@ericsson.com>

2384	       XML:

2386	         BEGIN
2387	         <?xml version="1.0"?>
2388	         <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
2389	           "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
2390	         <html xmlns="http://www.w3.org/1999/xhtml">
2391	         <head>
2392	           <meta http-equiv="content-type"
2393	                 content="text/html;charset=iso-8859-1"/>
2394	           <title> Centralized Conferencing Namespace</title>
2395	         </head>
2396	         <body>
2397	           <h1>Namespace for Centralized Conferencing</h1>
2398	           <h2>urn:ietf:params:xml:ns:xcon-conference-info</h2>
2399	         <p>See <a href="[URL of published RFC]">RFCXXXX
2400	             [NOTE TO IANA/RFC-EDITOR:
2401	              Please replace XXXX with the RFC number of this
2402	             specification.]</a>.</p>
2403	         </body>
2404	         </html>
2405	         END

2407	9.3.  Conference Object Identifier Registration

2409	 The IANA is requested to register the following URI scheme
2410	 under the Permanent URI Schemes register.

2412	 XCON-URI = "xcon" ":" [conf-object-id "@"] host [ ":" port ] [RFC xxxx]

2414	  conf-object-id = 1*( unreserved / "+" / "=" / "/" )

2416	   host, port, and unreserved are defined in RFC3986[RFC3986]

2418	   [Note to the RFC Editor: replace xxxx with the number this RFC gets
2419	   assigned.]
2420	    Subject: Request for XCON-URI Registration
2421	    Person & email address to contact for further information:
2422	         Oscar Novo <oscar novo_at_ericsson.com>
2423	    Specification: RFC XXXX
2424	    Author/Change Controller: IESG
2425	    Comments:
2426	        Identifies the Conference

2428	9.4.  Conference User Identifier Registration

2430	   The IANA is requested to register the following URI scheme
2431	    under the Permanent URI Schemes register.

2433	    XCON-USERID = "xcon-userid" ":" conf-user-id  [ RFC xxxx ]

2435	    conf-user-id = 1*(unreserved)

2437	   unreserved is defined in RFC3986[RFC3986]

2439	   [Note to the RFC Editor: replace xxxx with the number this RFC gets
2440	   assigned.]

2442	    Subject: Request for XCON-USERID Registration
2443	    Person & email address to contact for further information:
2444	         Oscar Novo <oscar novo_at_ericsson.com>
2445	    Specification: RFC XXXX
2446	    Author/Change Controller: IESG
2447	    Comments:
2448	        Identifies the User in the conference

2450	10.  Acknowledgements

2452	   This document is really a distillation of many ideas discussed over a
2453	   long period of time.  These ideas were contributed by many different
2454	   drafts in the XCON working group and the SIPPING working group.  We
2455	   would like to thank Orit Levin, Roni Even, Adam Roach, Mary Barnes,
2456	   Chris Boulton, Umesh Chandra, Hisham Khartabil, Petri Koskelainen,
2457	   Aki Niemi, Rohan Mahy, Jonathan Lennox, Sean Duddy, Richard Barnes,
2458	   and Henning Schulzrinne for their comments.  Also, we would like to
2459	   thank Mary Barnes, and Chris Boulton for letting us use the
2460	   conference and user identifier information of their xcon drafts.
2461	   Last but not least, we would like to express our gratitude to all
2462	   those reviewers for their invaluable contribution: Simon Pietro
2463	   Romano, Lorenzo Miniero, Tobia Castaldi, Miguel Garcia, Mary Barnes,
2464	   Srivatsa Srinivasan, Avshalom Houri, Pierre Tane, and Ben Campbell.

2466	11.  References

2468	11.1.  Normative References

2470	   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
2471	              Requirement Levels", BCP 14, RFC 2119, March 1997.

2473	   [RFC2445]  Dawson, F. and Stenerson, D., "Internet Calendaring and
2474	              Scheduling Core Object Specification (iCalendar)",
2475	              RFC 2445, November 1998.

2477	   [RFC4575]  Rosenberg, J., Schulzrinne, H., and O. Levin, "A Session
2478	              Initiation Protocol (SIP) Event Package for Conference
2479	              State", RFC 4575, August 2006.

2481	   [RFC4582]  Camarillo, G., Ott, J., and K. Drage, "The Binary Floor
2482	              Control Protocol (BFCP)", RFC 4582, November 2006.

2484	   [RFC4583]  Camarillo, G., "Session Description Protocol (SDP) Format
2485	              for Binary Floor Control Protocol (BFCP) Streams",
2486	              RFC 4583, November 2006.

2488	   [RFC5239]  Barnes, M., Boulton, C., and O. Levin, "A Framework for
2489	              Centralized Conferencing", RFC 5239, June 2008.

2491	11.2.  Informative References

2493	   [IANA]     "IANA registry for RTP Payload Types"
2494	              "http://www.iana.org/assignments/rtp-parameters".

2496	   [IANA-Lan]
2497	              "IANA Language Subtag Registry"
2498	              "http://www.iana.org/assignments/
2499	              language-subtag-registry".

2501	   [RELAX]    "RELAX NG Home Page" "http://relaxng.org/".

2503	   [RFC3264]  Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model
2504	              with Session Description Protocol (SDP)", RFC 3264,
2505	              June 2002.

2507	   [RFC3265]  Roach, A., "Session Initiation Protocol (SIP)-Specific
2508	              Event Notification", RFC 3265, June 2002.

2510	   [RFC3986]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
2511	              Resource Identifier (URI): Generic Syntax", STD 66,
2512	              RFC 3986, January 2005.

2514	   [RFC4353]  Rosenberg, J., "A Framework for Conferencing with the
2515	              Session Initiation Protocol (SIP)", RFC 4353,
2516	              February 2006.

2518	   [RFC4855]  Casner, S., "Media Type Registration of RTP Payload
2519	              Formats", RFC 4855, February 2007.

2521	   [RFC5018]  Camarillo, G., "Connection Establishment in the Binary
2522	              Floor Control Protocol (BFCP)", RFC 5018, September 2007.

2524	   [RFC5646]  Phillips, A. and M. Davis, "Tags for Identifying
2525	              Languages", BCP 47, RFC 5646, September 2009.

2527	   [W3C.REC-xml-20001006]
2528	              Bray, T., Sperberg-McQueen, C., Paoli, J., and E. Maler,
2529	              "Extensible Markup Language (XML) 1.0 (Second Edition)",
2530	              World Wide Web Consortium FirstEdition REC-xml-20001006,
2531	              October 2000,
2532	              <http://www.w3.org/TR/2000/REC-xml-20001006>.

2534	Appendix A.  Non-Normative RELAX NG Schema in XML Syntax

2536	 <?xml version="1.0" encoding="UTF-8" ?>
2537	    <grammar
2538	           ns="urn:ietf:params:xml:ns:conference-info"
2539	           xmlns="http://relaxng.org/ns/structure/1.0"
2540	           xmlns:xcon="urn:ietf:params:xml:ns:xcon-conference-info"
2541	           datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
2542	           <start>
2543	            <element name="conference-info">
2544	             <ref name="conference-type"/>
2545	            </element>
2546	           </start>
2547	           <!--
2548	               CONFERENCE TYPE
2549	           -->
2550	           <define name="conference-type">
2551	            <interleave>
2552	            <attribute name="entity">
2553	             <text/>
2554	            </attribute>
2555	            <ref name="anyAttribute"/>
2556	            <optional>
2557	             <ref name="conference-description-type"/>
2558	            </optional>
2559	            <optional>
2560	             <element name="host-info">
2561	              <ref name="host-type"/>
2562	             </element>
2563	            </optional>
2564	            <optional>
2565	             <element name="conference-state">
2566	              <ref name="conference-state-type"/>
2567	             </element>
2568	            </optional>
2569	            <optional>
2570	             <element name="users">
2571	              <ref name="users-type"/>
2572	             </element>
2573	            </optional>
2574	            <optional>
2575	             <element name="sidebars-by-ref">
2576	              <ref name="uris-type"/>
2577	             </element>
2578	            </optional>
2579	            <optional>
2580	             <element name="sidebars-by-val">
2581	              <ref name="sidebars-by-val-type"/>
2582	             </element>
2583	            </optional>
2584	            <optional>
2585	             <element name="xcon:floor-information">
2586	              <ref name="floor-information-type"/>
2587	             </element>
2588	            </optional>
2589	            <zeroOrMore>
2590	             <ref name="anyElement"/>
2591	            </zeroOrMore>
2592	            </interleave>
2593	           </define>
2594	           <!--
2595	               CONFERENCE DESCRIPTION TYPE
2596	           -->
2597	           <define name="conference-description-type">
2598	            <element name="conference-description">
2599	             <interleave>
2600	             <optional>
2601	              <attribute name="xml:lang">
2602	               <data type="language"/>
2603	              </attribute>
2604	             </optional>
2605	             <ref name="anyAttribute"/>
2606	             <optional>
2607	              <element name="display-text">
2608	               <text/>
2609	              </element>
2610	             </optional>
2611	             <optional>
2612	              <element name="subject">
2613	               <text/>
2614	              </element>
2615	             </optional>
2616	             <optional>
2617	              <element name="free-text">
2618	               <text/>
2619	              </element>
2620	             </optional>
2621	             <optional>
2622	              <element name="keywords">
2623	               <list>
2624	                <zeroOrMore>
2625	                 <data type="string"/>
2626	                </zeroOrMore>
2627	               </list>
2628	              </element>
2629	             </optional>
2630	             <optional>
2631	              <element name="conf-uris">
2632	               <ref name="uris-type"/>
2633	              </element>
2634	             </optional>
2635	             <optional>
2636	              <element name="service-uris">
2637	                 <ref name="uris-type"/>
2638	              </element>
2639	             </optional>
2640	             <optional>
2641	              <element name="maximum-user-count">
2642	               <data type="int"/>
2643	              </element>
2644	             </optional>
2645	             <optional>
2646	              <element name="available-media">
2647	               <ref name="conference-media-type"/>
2648	              </element>
2649	             </optional>
2650	             <optional>
2651	              <element name="xcon:language">
2652	               <data type="language"/>

2654	              </element>
2655	             </optional>
2656	             <optional>
2657	              <element name="xcon:allow-sidebars">
2658	               <data type="boolean"/>
2659	              </element>
2660	             </optional>
2661	             <optional>
2662	             <element name="xcon:cloning-parent">
2663	              <data type="anyURI"/>
2664	             </element>
2665	             </optional>
2666	             <optional>
2667	             <element name="xcon:sidebar-parent">
2668	              <data type="anyURI"/>
2669	             </element>
2670	             </optional>
2671	             <optional>
2672	              <element name="xcon:conference-time">
2673	               <ref name="conferencetime-type"/>
2674	              </element>
2675	             </optional>
2676	             <zeroOrMore>
2677	              <ref name="anyElement"/>
2678	             </zeroOrMore>
2679	             </interleave>
2680	            </element>
2681	           </define>
2682	           <!--
2683	               HOST TYPE
2684	           -->
2685	           <define name="host-type">
2686	            <interleave>
2687	            <optional>
2688	             <element name="display-text">
2689	              <text/>
2690	             </element>
2691	            </optional>
2692	            <optional>
2693	             <element name="web-page">
2694	              <data type="anyURI"/>
2695	             </element>
2696	            </optional>
2697	            <optional>
2698	             <element name="uris">
2699	              <ref name="uris-type"/>
2700	             </element>
2701	            </optional>
2702	            <zeroOrMore>
2703	             <ref name="anyElement"/>
2704	            </zeroOrMore>
2705	            <ref name="anyAttribute"/>
2706	            </interleave>
2707	           </define>
2708	           <!--
2709	               CONFERENCE STATE TYPE
2710	           -->
2711	           <define name="conference-state-type">
2712	            <interleave>
2713	            <ref name="anyAttribute"/>
2714	            <optional>
2715	             <element name="user-count">
2716	              <data type="unsignedInt"/>
2717	             </element>
2718	            </optional>
2719	            <optional>
2720	             <element name="active">
2721	              <data type="boolean"/>
2722	             </element>
2723	            </optional>
2724	            <optional>
2725	             <element name="locked">
2726	              <data type="boolean"/>
2727	             </element>
2728	            </optional>
2729	            <optional>
2730	             <element name="xcon:allow-conference-event-subscription">
2731	              <data type="boolean"/>
2732	             </element>
2733	            </optional>
2734	            <zeroOrMore>
2735	             <ref name="anyElement"/>
2736	            </zeroOrMore>
2737	            </interleave>
2738	           </define>
2739	           <!--
2740	               CONFERENCE MEDIA TYPE
2741	           -->
2742	           <define name="conference-media-type">
2743	            <interleave>
2744	            <ref name="anyAttribute"/>
2745	            <zeroOrMore>
2746	             <element name="entry">
2747	              <ref name="conference-medium-type"/>
2748	             </element>
2749	            </zeroOrMore>
2750	            <zeroOrMore>
2751	             <ref name="anyElement"/>
2752	            </zeroOrMore>
2753	            </interleave>
2754	           </define>
2755	           <!--
2756	               CONFERENCE MEDIUM TYPE
2757	           -->
2758	           <define name="conference-medium-type">
2759	            <interleave>
2760	            <attribute name="label">
2761	             <text/>
2762	            </attribute>
2763	            <ref name="anyAttribute"/>
2764	            <optional>
2765	             <element name="display-text">
2766	              <text/>
2767	             </element>
2768	            </optional>
2769	            <optional>
2770	             <element name="type">
2771	              <text/>
2772	             </element>
2773	            </optional>
2774	            <optional>
2775	             <element name="status">
2776	              <ref name="media-status-type"/>
2777	             </element>
2778	            </optional>
2779	            <optional>
2780	             <element name="xcon:mixing-mode">
2781	              <ref name="mixing-mode-type"/>
2782	             </element>
2783	            </optional>
2784	            <optional>
2785	             <element name="xcon:codecs">
2786	              <ref name="codecs-type"/>
2787	             </element>
2788	            </optional>
2789	            <optional>
2790	             <element name="xcon:controls">
2791	              <ref name="control-type"/>
2792	             </element>
2793	            </optional>
2794	            <zeroOrMore>
2795	             <ref name="anyElement"/>
2796	            </zeroOrMore>
2797	            </interleave>

2799	           </define>
2800	           <!--
2801	               URIs TYPE
2802	           -->
2803	           <define name="uris-type">
2804	            <interleave>
2805	            <ref name="anyAttribute"/>
2806	            <zeroOrMore>
2807	             <element name="entry">
2808	              <ref name="uri-type"/>
2809	             </element>
2810	            </zeroOrMore>
2811	            <zeroOrMore>
2812	             <ref name="anyElement"/>
2813	            </zeroOrMore>
2814	            </interleave>
2815	           </define>
2816	           <!--
2817	               URI TYPE
2818	           -->
2819	           <define name="uri-type">
2820	            <interleave>
2821	            <element name="uri">
2822	             <data type="anyURI"/>
2823	            </element>
2824	            <optional>
2825	             <element name="display-text">
2826	              <text/>
2827	             </element>
2828	            </optional>
2829	            <optional>
2830	             <element name="purpose">
2831	              <text/>
2832	             </element>
2833	            </optional>
2834	            <optional>
2835	             <element name="modified">
2836	              <ref name="execution-type"/>
2837	             </element>
2838	            </optional>
2839	            <zeroOrMore>
2840	             <element name="xcon:conference-password">
2841	              <text/>
2842	             </element>
2843	            </zeroOrMore>
2844	            <zeroOrMore>
2845	             <ref name="anyElement"/>
2846	            </zeroOrMore>
2847	            <ref name="anyAttribute"/>
2848	           </interleave>

2850	           </define>
2851	           <!--
2852	               USERS TYPE
2853	           -->
2854	           <define name="users-type">
2855	            <interleave>
2856	            <ref name="anyAttribute"/>
2857	            <zeroOrMore>
2858	             <element name="user">
2859	              <ref name="user-type"/>
2860	             </element>
2861	            </zeroOrMore>
2862	            <optional>
2863	             <element name="xcon:join-handling">
2864	              <ref name="join-handling-type"/>
2865	             </element>
2866	            </optional>
2867	            <optional>
2868	             <element name="xcon:user-admission-policy">
2869	              <ref name="user-admission-policy-type"/>
2870	             </element>
2871	            </optional>
2872	            <optional>
2873	             <element name="xcon:allowed-users-list">
2874	              <ref name="allowed-users-list-type"/>
2875	             </element>
2876	            </optional>
2877	            <optional>
2878	             <element name="xcon:deny-users-list">
2879	              <ref name="deny-user-list-type"/>
2880	             </element>
2881	            </optional>
2882	            <zeroOrMore>
2883	             <ref name="anyElement"/>
2884	            </zeroOrMore>
2885	            </interleave>
2886	           </define>
2887	           <!--
2888	               USER TYPE
2889	           -->
2890	           <define name="user-type">
2891	            <interleave>
2892	            <attribute name="entity">
2893	             <data type="anyURI"/>
2894	            </attribute>
2895	            <ref name="anyAttribute"/>
2896	            <optional>
2897	             <element name="display-text">
2898	              <text/>
2899	             </element>
2900	            </optional>
2901	            <optional>
2902	             <element name="associated-aors">
2903	               <ref name="uris-type"/>
2904	             </element>
2905	            </optional>
2906	            <optional>
2907	             <element name="roles">
2908	              <oneOrMore>
2909	               <element name="entry">
2910	                <ref name="single-role-type"/>
2911	               </element>
2912	              </oneOrMore>
2913	             </element>
2914	            </optional>
2915	            <optional>
2916	             <element name="languages">
2917	              <list>
2918	               <data type="language"/>
2919	              </list>
2920	             </element>
2921	            </optional>
2922	            <optional>
2923	             <element name="cascaded-focus">
2924	              <data type="anyURI"/>
2925	             </element>
2926	            </optional>
2927	            <zeroOrMore>
2928	             <element name="endpoint">
2929	              <ref name="endpoint-type"/>
2930	             </element>
2931	            </zeroOrMore>
2932	            <optional>
2933	             <element name="xcon:provide-anonymity">
2934	              <ref name="provide-anonymity-type"/>
2935	             </element>
2936	            </optional>
2937	           <optional>
2938	             <element name="xcon:allow-refer-users-dynamically">
2939	              <data type="boolean"/>
2940	             </element>
2941	            </optional>
2942	            <optional>
2943	             <element name="xcon:allow-invite-users-dynamically">
2944	              <data type="boolean"/>
2945	             </element>
2946	            </optional>
2947	            <optional>
2948	             <element name="xcon:allow-remove-users-dynamically">
2949	              <data type="boolean"/>
2950	             </element>
2951	            </optional>
2952	             <zeroOrMore>
2953	             <ref name="anyElement"/>
2954	            </zeroOrMore>
2955	            </interleave>
2956	           </define>
2957	           <!--
2958	               ENDPOINT TYPE
2959	           -->
2960	           <define name="endpoint-type">
2961	            <interleave>
2962	            <attribute name="entity">
2963	             <text/>
2964	            </attribute>
2965	            <ref name="anyAttribute"/>
2966	            <optional>
2967	             <element name="display-text">
2968	              <text/>
2969	             </element>
2970	            </optional>
2971	            <optional>
2972	             <element name="referred">
2973	               <ref name="execution-type"/>
2974	             </element>
2975	            </optional>
2976	            <optional>
2977	             <element name="status">
2978	              <ref name="endpoint-status-type"/>
2979	             </element>
2980	            </optional>
2981	            <optional>
2982	             <element name="joining-method">
2983	              <ref name="joining-type"/>
2984	             </element>
2985	            </optional>
2986	            <optional>
2987	             <element name="joining-info">
2988	               <ref name="execution-type"/>
2989	             </element>
2990	            </optional>
2991	            <optional>
2992	             <element name="disconnection-method">
2993	              <ref name="disconnection-type"/>
2994	             </element>
2995	            </optional>
2996	            <optional>
2997	             <element name="disconnection-info">
2998	              <ref name="execution-type"/>
2999	             </element>
3000	            </optional>
3001	            <zeroOrMore>
3002	             <element name="media">
3003	              <ref name="media-type"/>
3004	             </element>
3005	            </zeroOrMore>
3006	            <optional>
3007	             <element name="call-info">
3008	              <ref name="call-type"/>
3009	             </element>
3010	            </optional>
3011	            <zeroOrMore>
3012	             <element name="xcon:floor">
3013	              <attribute name="id">
3014	               <text/>
3015	              </attribute>
3016	              <ref name="anyAttribute"/>
3017	              <data type="boolean"/>
3018	             </element>
3019	            </zeroOrMore>
3020	            <zeroOrMore>
3021	             <ref name="anyElement"/>
3022	            </zeroOrMore>
3023	            </interleave>
3024	           </define>
3025	           <!--
3026	               ENDPOINT STATUS TYPE
3027	           -->
3028	           <define name="endpoint-status-type">
3029	            <choice>
3030	             <value>pending</value>
3031	             <value>dialing-out</value>
3032	             <value>dialing-in</value>
3033	             <value>alerting</value>
3034	             <value>on-hold</value>
3035	             <value>connected</value>
3036	             <value>muted-via-focus</value>
3037	             <value>disconnecting</value>
3038	             <value>disconnected</value>
3039	             <ref name="free-text-extension"/>
3040	            </choice>
3041	           </define>
3042	           <!--
3043	               JOINING TYPE
3044	           -->
3045	           <define name="joining-type">
3046	            <choice>
3047	             <value>dialed-in</value>
3048	             <value>dialed-out</value>
3049	             <value>focus-owner</value>
3050	             <ref name="free-text-extension"/>
3051	            </choice>
3052	           </define>
3053	           <!--
3054	               DISCONNECTION TYPE
3055	           -->
3056	           <define name="disconnection-type">
3057	            <choice>
3058	             <value>departed</value>
3059	             <value>booted</value>
3060	             <value>failed</value>
3061	             <value>busy</value>
3062	             <ref name="free-text-extension"/>
3063	            </choice>
3064	           </define>
3065	           <!--
3066	               EXECUTION TYPE
3067	           -->
3068	           <define name="execution-type">
3069	            <interleave>
3070	            <optional>
3071	             <element name="when">
3072	              <data type="dateTime"/>
3073	             </element>
3074	            </optional>
3075	            <optional>
3076	             <element name="reason">
3077	              <text/>
3078	             </element>
3079	            </optional>
3080	            <optional>
3081	             <element name="by">
3082	              <data type="anyURI"/>
3083	             </element>
3084	            </optional>
3085	            <ref name="anyAttribute"/>
3086	            </interleave>

3088	           </define>
3089	           <!--
3090	               CALL TYPE
3091	           -->
3092	           <define name="call-type">
3093	            <interleave>
3094	             <element name="sip">
3095	              <ref name="sip-dialog-id-type"/>
3096	             </element>
3097	             <zeroOrMore>
3098	              <ref name="anyElement"/>
3099	             </zeroOrMore>
3100	             <ref name="anyAttribute"/>
3101	            </interleave>
3102	           </define>
3103	           <!--
3104	               SIP DIALOG ID TYPE
3105	           -->
3106	           <define name="sip-dialog-id-type">
3107	            <interleave>
3108	            <optional>
3109	            <element name="display-text">
3110	             <text/>
3111	            </element>
3112	            </optional>
3113	            <element name="call-id">
3114	             <text/>
3115	            </element>
3116	            <element name="from-tag">
3117	             <text/>
3118	            </element>
3119	            <element name="to-tag">
3120	             <text/>
3121	            </element>
3122	            <zeroOrMore>
3123	             <ref name="anyElement"/>
3124	            </zeroOrMore>
3125	            <ref name="anyAttribute"/>
3126	            </interleave>
3127	           </define>
3128	           <!--
3129	               MEDIA TYPE
3130	           -->
3131	           <define name="media-type">
3132	            <interleave>
3133	            <attribute name="id">
3134	             <data type="int"/>
3135	            </attribute>
3136	            <ref name="anyAttribute"/>
3137	            <optional>
3138	             <element name="display-text">
3139	              <text/>
3140	             </element>
3141	            </optional>
3142	            <optional>
3143	             <element name="type">
3144	              <text/>
3145	             </element>
3146	            </optional>
3147	            <optional>
3148	             <element name="label">
3149	              <text/>
3150	             </element>
3151	            </optional>
3152	            <optional>
3153	             <element name="src-id">
3154	              <text/>
3155	             </element>
3156	            </optional>
3157	            <optional>
3158	             <element name="status">
3159	              <ref name="media-status-type"/>
3160	             </element>
3161	            </optional>
3162	            <optional>
3163	             <element name="xcon:to-mixer">
3164	              <ref name="mixer-type"/>
3165	             </element>
3166	            </optional>
3167	            <optional>
3168	             <element name="xcon:from-mixer">
3169	              <ref name="mixer-type"/>
3170	             </element>
3171	            </optional>
3172	            <zeroOrMore>
3173	             <ref name="anyElement"/>
3174	            </zeroOrMore>
3175	            </interleave>
3176	           </define>
3177	           <!--
3178	               MEDIA STATUS TYPE
3179	           -->
3180	           <define name="media-status-type">
3181	            <choice>
3182	             <value>recvonly</value>
3183	             <value>sendonly</value>
3184	             <value>sendrecv</value>
3185	             <value>inactive</value>
3186	             <ref name="free-text-extension"/>
3187	            </choice>
3188	           </define>
3189	           <!--
3190	               SIDEBARS-BY-VAL TYPE
3191	           -->
3192	           <define name="sidebars-by-val-type">
3193	            <interleave>
3194	            <ref name="anyAttribute"/>
3195	            <zeroOrMore>
3196	             <element name="entry">
3197	              <ref name="conference-type"/>
3198	             </element>
3199	            </zeroOrMore>
3200	            <zeroOrMore>
3201	             <ref name="anyElement"/>
3202	            </zeroOrMore>
3203	            </interleave>
3204	           </define>
3205	           <!--
3206	               CONFERENCE TIME
3207	           -->
3208	           <define name="conferencetime-type">
3209	            <interleave>
3210	            <ref name="anyAttribute"/>
3211	            <zeroOrMore>
3212	             <element name="xcon:entry">
3213	              <element name="xcon:base">
3214	               <text/>
3215	              </element>
3216	              <optional>
3217	               <element name="xcon:mixing-start-offset">
3218	                 <ref name="time-type"/>
3219	                 <attribute name="required-participant">
3220	                  <ref name="single-role-type"/>
3221	                 </attribute>
3222	                <ref name="anyAttribute"/>
3223	               </element>
3224	              </optional>
3225	              <optional>
3226	               <element name="xcon:mixing-end-offset">
3227	                <ref name="time-type"/>
3228	                <attribute name="required-participant">
3229	                 <ref name="single-role-type"/>
3230	                </attribute>
3231	                <ref name="anyAttribute"/>

3233	               </element>
3234	              </optional>
3235	              <optional>
3236	               <element name="xcon:can-join-after-offset">
3237	                <ref name="time-type"/>
3238	               </element>
3239	              </optional>
3240	              <optional>
3241	               <element name="xcon:must-join-before-offset">
3242	                <ref name="time-type"/>
3243	               </element>
3244	              </optional>
3245	              <optional>
3246	               <element name="xcon:request-user">
3247	                <ref name="time-type"/>
3248	               </element>
3249	              </optional>
3250	              <optional>
3251	               <element name="xcon:notify-end-of-conference">
3252	                <data type="int"/>
3253	               </element>
3254	              </optional>
3255	              <optional>
3256	               <element name="xcon:allowed-extend-mixing-end-offset">
3257	                <data type="boolean"/>
3258	               </element>
3259	              </optional>
3260	              <zeroOrMore>
3261	               <ref name="anyElement"/>
3262	              </zeroOrMore>
3263	             </element>
3264	            </zeroOrMore>
3265	            </interleave>
3266	           </define>
3267	           <!--
3268	               TIME TYPE
3269	           -->
3270	           <define name="time-type">
3271	             <data type="dateTime">
3272	               <param name="pattern">.+T.+Z.*</param>
3273	             </data>
3274	           </define>
3275	           <!--
3276	               SINGLE ROLE TYPE
3277	           -->
3278	           <define name="single-role-type">
3279	            <choice>
3280	             <value type="string">none</value>
3281	             <value type="string">administrator</value>
3282	             <value type="string">moderator</value>
3283	             <value type="string">user</value>
3284	             <value type="string">observer</value>
3285	             <value type="string">participant</value>
3286	             <ref name="free-text-extension"/>
3287	            </choice>
3288	           </define>
3289	           <!--
3290	               MIXING MODE TYPE
3291	           -->
3292	           <define name="mixing-mode-type">
3293	            <choice>
3294	             <value type="string">moderator-controlled</value>
3295	             <value type="string">FCFS</value>
3296	             <value type="string">automatic</value>
3297	             <ref name="free-text-extension"/>
3298	            </choice>
3299	           </define>
3300	           <!--
3301	               CODECS TYPE
3302	           -->
3303	           <define name="codecs-type">
3304	            <interleave>
3305	            <attribute name="decision">
3306	             <ref name="decision-type"/>
3307	            </attribute>
3308	            <ref name="anyAttribute"/>
3309	            <zeroOrMore>
3310	             <element name="xcon:codec">
3311	              <ref name="codec-type"/>
3312	             </element>
3313	            </zeroOrMore>
3314	            <zeroOrMore>
3315	             <ref name="anyElement"/>
3316	            </zeroOrMore>
3317	            </interleave>
3318	           </define>
3319	           <!--
3320	               CODEC TYPE
3321	           -->
3322	           <define name="codec-type">
3323	            <interleave>
3324	            <attribute name="name">
3325	             <text/>
3326	            </attribute>
3327	            <attribute name="policy">
3328	             <ref name="policy-type"/>

3330	            </attribute>
3331	            <ref name="anyAttribute"/>
3332	            <optional>
3333	             <element name="xcon:subtype">
3334	              <text/>
3335	             </element>
3336	            </optional>
3337	            <zeroOrMore>
3338	             <ref name="anyElement"/>
3339	            </zeroOrMore>
3340	            </interleave>
3341	           </define>
3342	           <!--
3343	               DECISION TYPE
3344	           -->
3345	           <define name="decision-type">
3346	            <choice>
3347	             <value type="string">automatic</value>
3348	             <value type="string">moderator-controlled</value>
3349	             <ref name="free-text-extension"/>
3350	            </choice>
3351	           </define>
3352	           <!--
3353	               POLICY TYPE
3354	           -->
3355	           <define name="policy-type">
3356	            <choice>
3357	             <value type="string">allowed</value>
3358	             <value type="string">disallowed</value>
3359	             <ref name="free-text-extension"/>
3360	            </choice>
3361	           </define>
3362	           <!--
3363	               CONTROL TYPE
3364	           -->
3365	           <define name="control-type">
3366	            <interleave>
3367	            <ref name="anyAttribute"/>
3368	            <optional>
3369	             <element name="xcon:mute">
3370	              <data type="boolean"/>
3371	             </element>
3372	            </optional>
3373	            <optional>
3374	             <element name="xcon:pause-video">
3375	              <data type="boolean"/>
3376	             </element>
3377	            </optional>
3378	            <optional>
3379	             <element name="xcon:gain">
3380	              <ref name="gain-type"/>
3381	             </element>
3382	            </optional>
3383	            <optional>
3384	             <element name="xcon:video-layout">
3385	              <ref name="video-layout-type"/>
3386	             </element>
3387	            </optional>
3388	            <zeroOrMore>
3389	             <ref name="anyElement"/>
3390	            </zeroOrMore>
3391	            </interleave>
3392	           </define>
3393	           <!--
3394	               GAIN TYPE
3395	           -->
3396	           <define name="gain-type">
3397	             <data type="int">
3398	               <param name="minInclusive">-127</param>
3399	               <param name="maxInclusive">127</param>
3400	             </data>
3401	           </define>
3402	           <!--
3403	               VIDEO LAYOUT TYPE
3404	           -->
3405	           <define name="video-layout-type">
3406	              <choice>
3407	               <value type="string">single-view</value>
3408	               <value type="string">dual-view</value>
3409	               <value type="string">dual-view-crop</value>
3410	               <value type="string">dual-view-2x1</value>
3411	               <value type="string">dual-view-2x1-crop</value>
3412	               <value type="string">quad-view</value>
3413	               <value type="string">multiple-3x3</value>
3414	               <value type="string">multiple-4x4</value>
3415	               <value type="string">multiple-5x1</value>
3416	               <value type="string">automatic</value>
3417	               <ref name="free-text-extension"/>
3418	              </choice>
3419	           </define>
3420	           <!--
3421	               FLOOR INFORMATION TYPE
3422	           -->
3423	           <define name="floor-information-type">
3424	            <interleave>
3425	            <ref name="anyAttribute"/>
3426	            <optional>
3427	             <element name="xcon:conference-ID">
3428	              <data type="unsignedLong"/>
3429	             </element>
3430	            </optional>
3431	            <optional>
3432	             <element name="xcon:allow-floor-events">
3433	              <data type="boolean"/>
3434	             </element>
3435	            </optional>
3436	            <optional>
3437	             <element name="xcon:floor-request-handling">
3438	              <ref name="floor-request-type"/>
3439	             </element>
3440	            </optional>
3441	            <optional>
3442	             <element name="xcon:conference-floor-policy">
3443	              <ref name="conference-floor-policy"/>
3444	             </element>
3445	            </optional>
3446	            <zeroOrMore>
3447	             <ref name="anyElement"/>
3448	            </zeroOrMore>
3449	            </interleave>
3450	           </define>
3451	           <!--
3452	               FLOOR REQUEST TYPE
3453	           -->
3454	           <define name="floor-request-type">
3455	            <choice>
3456	             <value type="string">block</value>
3457	             <value type="string">confirm</value>
3458	             <ref name="free-text-extension"/>
3459	            </choice>
3460	           </define>
3461	           <!--
3462	               CONFERENCE FLOOR POLICY
3463	           -->
3464	           <define name="conference-floor-policy">
3465	            <interleave>
3466	            <ref name="anyAttribute"/>
3467	            <oneOrMore>
3468	             <element name="xcon:floor">
3469	              <interleave>
3470	              <attribute name="id">
3471	               <text/>
3472	              </attribute>
3473	              <ref name="anyAttribute"/>
3474	              <oneOrMore>
3475	               <element name="xcon:media-label">
3476	                <data type="nonNegativeInteger"/>
3477	               </element>
3478	              </oneOrMore>
3479	              <optional>
3480	               <element name="xcon:algorithm">
3481	                <ref name="algorithm-type"/>
3482	               </element>
3483	              </optional>
3484	              <optional>
3485	               <element name="xcon:max-floor-users">
3486	                <data type="nonNegativeInteger"/>
3487	               </element>
3488	              </optional>
3489	              <optional>
3490	               <element name="xcon:moderator-id">
3491	                <data type="nonNegativeInteger"/>
3492	               </element>
3493	              </optional>
3494	              <zeroOrMore>
3495	               <ref name="anyElement"/>
3496	              </zeroOrMore>
3497	              </interleave>
3498	             </element>
3499	            </oneOrMore>
3500	            </interleave>
3501	           </define>
3502	           <!--
3503	               ALGORITHM POLICY
3504	           -->
3505	           <define name="algorithm-type">
3506	            <choice>
3507	             <value type="string">moderator-controlled</value>
3508	             <value type="string">FCFS</value>
3509	             <value type="string">random</value>
3510	             <ref name="free-text-extension"/>
3511	            </choice>
3512	           </define>
3513	           <!--
3514	               USERS ADMISSION POLICY
3515	           -->
3516	           <define name="user-admission-policy-type">
3517	            <choice>
3518	             <value type="string">closedAuthenticated</value>
3519	             <value type="string">openAuthenticated</value>
3520	             <value type="string">anonymous</value>
3521	             <ref name="free-text-extension"/>

3523	            </choice>
3524	           </define>
3525	           <!--
3526	               JOIN HANDLING TYPE
3527	           -->
3528	           <define name="join-handling-type">
3529	            <choice>
3530	             <value type="string">block</value>
3531	             <value type="string">confirm</value>
3532	             <value type="string">allow</value>
3533	             <value type="string">authenticate</value>
3534	             <value type="string">directed-operator</value>
3535	             <ref name="free-text-extension"/>
3536	            </choice>
3537	           </define>
3538	           <!--
3539	               DENY USERLIST
3540	           -->
3541	           <define name="deny-user-list-type">
3542	            <interleave>
3543	            <ref name="anyAttribute"/>
3544	            <zeroOrMore>
3545	             <element name="xcon:target">
3546	              <attribute name="uri">
3547	               <data type="anyURI"/>
3548	              </attribute>
3549	              <ref name="anyAttribute"/>
3550	             </element>
3551	            </zeroOrMore>
3552	            <zeroOrMore>
3553	             <ref name="anyElement"/>
3554	            </zeroOrMore>
3555	            </interleave>
3556	           </define>
3557	           <!--
3558	               ALLOWED USERS LIST TYPE
3559	           -->
3560	           <define name="allowed-users-list-type">
3561	            <interleave>
3562	            <ref name="anyAttribute"/>
3563	            <zeroOrMore>
3564	             <element name="xcon:target">
3565	              <ref name="target-type"/>
3566	             </element>
3567	            </zeroOrMore>
3568	            <optional>
3569	             <element name="xcon:persistent-list">
3570	              <ref name="persistent-list-type"/>

3572	             </element>
3573	            </optional>
3574	            <zeroOrMore>
3575	             <ref name="anyElement"/>
3576	            </zeroOrMore>
3577	            </interleave>
3578	           </define>
3579	           <!--
3580	               PERSISTENT LIST TYPE
3581	           -->
3582	           <define name="persistent-list-type">
3583	            <interleave>
3584	              <zeroOrMore>
3585	               <element name="xcon:user">
3586	                <interleave>
3587	                <attribute name="name">
3588	                 <text/>
3589	                </attribute>
3590	                <attribute name="nickname">
3591	                 <text/>
3592	                </attribute>
3593	                <attribute name="id">
3594	                 <text/>
3595	                </attribute>
3596	                <ref name="anyAttribute"/>
3597	                <zeroOrMore>
3598	                 <element name="xcon:e-mail">
3599	                  <text/>
3600	                 </element>
3601	                </zeroOrMore>
3602	                <zeroOrMore>
3603	                 <ref name="anyElement"/>
3604	                </zeroOrMore>
3605	                </interleave>
3606	               </element>
3607	             </zeroOrMore>
3608	             <zeroOrMore>
3609	              <ref name="anyElement"/>
3610	             </zeroOrMore>
3611	            </interleave>
3612	           </define>
3613	           <!--
3614	               TARGET TYPE
3615	           -->
3616	           <define name="target-type">
3617	            <attribute name="uri">
3618	             <data type="anyURI"/>
3619	            </attribute>
3620	            <attribute name="method">
3621	             <ref name="method-type"/>
3622	            </attribute>
3623	            <ref name="anyAttribute"/>
3624	           </define>
3625	           <!--
3626	               METHOD TYPE
3627	           -->
3628	           <define name="method-type">
3629	            <choice>
3630	             <value type="string">dial-in</value>
3631	             <value type="string">dial-out</value>
3632	             <value type="string">refer</value>
3633	             <ref name="free-text-extension"/>
3634	            </choice>
3635	           </define>
3636	           <!--
3637	               ANONYMITY TYPE
3638	           -->
3639	           <define name="provide-anonymity-type">
3640	              <choice>
3641	               <value>private</value>
3642	               <value>semi-private</value>
3643	               <value>hidden</value>
3644	               <ref name="free-text-extension"/>
3645	              </choice>
3646	           </define>
3647	           <!--
3648	               MIXER TYPE
3649	           -->
3650	           <define name="mixer-type">
3651	            <interleave>
3652	            <attribute name="name">
3653	             <ref name="mixer-name-type"/>
3654	            </attribute>
3655	            <ref name="anyAttribute"/>
3656	            <zeroOrMore>
3657	             <element name="xcon:controls">
3658	              <ref name="control-type"/>
3659	             </element>
3660	            </zeroOrMore>
3661	            <zeroOrMore>
3662	             <ref name="anyElement"/>
3663	            </zeroOrMore>
3664	            </interleave>
3665	           </define>
3666	           <!--
3667	               MIXER NAME TYPE

3669	           -->
3670	           <define name="mixer-name-type">
3671	             <choice>
3672	              <value>VideoIn</value>
3673	              <value>VideoOut</value>
3674	              <value>AudioOut</value>
3675	              <value>AudioIn</value>
3676	              <ref name="free-text-extension"/>
3677	             </choice>
3678	           </define>
3679	           <!--
3680	               FREE TEXT EXTENSION
3681	               (re-define this as <notAllowed>,
3682	                if extensions beyond this spec are not used)
3683	           -->
3684	           <define name="free-text-extension">
3685	            <text/>
3686	           </define>

3688	           <!--
3689	            *********************************
3690	            EXTENSIBILITY OF THE SCHEMA
3691	            *********************************
3692	           -->
3693	           <!--
3694	               EXTENSIBILITY ELEMENTS
3695	               (re-define this as <empty/>,
3696	                if extensions beyond this spec are not used)
3697	           -->
3698	           <define name="anyElement">
3699	            <element>
3700	             <anyName>
3701	              <except>
3702	               <name>conference-description</name>
3703	               <name>host-info</name>
3704	               <name>conference-state</name>
3705	               <name>users</name>
3706	               <name>sidebars-by-ref</name>
3707	               <name>sidebars-by-val</name>
3708	               <name>display-text</name>
3709	               <name>subject</name>
3710	               <name>free-text</name>
3711	               <name>keywords</name>
3712	               <name>conf-uris</name>
3713	               <name>service-uris</name>
3714	               <name>maximum-user-count</name>
3715	               <name>available-media</name>
3716	               <name>web-page</name>
3717	               <name>uris</name>
3718	               <name>uri</name>
3719	               <name>user-count</name>
3720	               <name>active</name>
3721	               <name>locked</name>
3722	               <name>entry</name>
3723	               <name>type</name>
3724	               <name>status</name>
3725	               <name>purpose</name>
3726	               <name>modified</name>
3727	               <name>user</name>
3728	               <name>associated-aors</name>
3729	               <name>roles</name>
3730	               <name>languages</name>
3731	               <name>cascaded-focus</name>
3732	               <name>endpoint</name>
3733	               <name>referred</name>
3734	               <name>joining-method</name>
3735	               <name>joining-info</name>
3736	               <name>disconnection-method</name>
3737	               <name>disconnection-info</name>
3738	               <name>media</name>
3739	               <name>call-info</name>
3740	               <name>when</name>
3741	               <name>reason</name>
3742	               <name>by</name>
3743	               <name>sip</name>
3744	               <name>call-id</name>
3745	               <name>from-tag</name>
3746	               <name>to-tag</name>
3747	               <name>label</name>
3748	               <name>src-id</name>
3749	               <name>xcon:conference-password</name>
3750	               <name>xcon:mixing-mode</name>
3751	               <name>xcon:codecs</name>
3752	               <name>xcon:controls</name>
3753	               <name>xcon:language</name>
3754	               <name>xcon:allow-sidebars</name>
3755	               <name>xcon:cloning-parent</name>
3756	               <name>xcon:sidebar-parent</name>
3757	               <name>xcon:allow-conference-event-subscription</name>
3758	               <name>xcon:to-mixer</name>
3759	               <name>xcon:provide-anonymity</name>
3760	               <name>xcon:allow-refer-users-dynamically</name>
3761	               <name>xcon:allow-invite-users-dynamically</name>
3762	               <name>xcon:allow-remove-users-dynamically</name>
3763	               <name>xcon:from-mixer</name>
3764	               <name>xcon:join-handling</name>
3765	               <name>xcon:user-admission-policy</name>
3766	               <name>xcon:allowed-users-list</name>
3767	               <name>xcon:deny-users-list</name>
3768	               <name>xcon:floor-information</name>
3769	               <name>xcon:conference-time</name>
3770	               <name>xcon:provide-anonymity</name>
3771	               <name>xcon:floor</name>
3772	               <name>xcon:entry</name>
3773	               <name>xcon:mixing-start-offset</name>
3774	               <name>xcon:mixing-end-offset</name>
3775	               <name>xcon:can-join-after-offset</name>
3776	               <name>xcon:must-join-before-offset</name>
3777	               <name>xcon:request-user</name>
3778	               <name>xcon:notify-end-of-conference</name>
3779	               <name>xcon:allowed-extend-mixing-end-offset</name>
3780	               <name>xcon:codec</name>
3781	               <name>xcon:subtype</name>
3782	               <name>xcon:mute</name>
3783	               <name>xcon:pause-video</name>
3784	               <name>xcon:gain</name>
3785	               <name>xcon:video-layout</name>
3786	               <name>xcon:conference-ID</name>
3787	               <name>xcon:allow-floor-events</name>
3788	               <name>xcon:floor-request-handling</name>
3789	               <name>xcon:conference-floor-policy</name>
3790	               <name>xcon:media-label</name>
3791	               <name>xcon:algorithm</name>
3792	               <name>xcon:max-floor-users</name>
3793	               <name>xcon:moderator-id</name>
3794	               <name>xcon:target</name>
3795	               <name>xcon:persistent-list</name>
3796	               <name>xcon:e-mail</name>
3797	               <name>xcon:user</name>
3798	              </except>
3799	             </anyName>
3800	             <ref name="anyExtension"/>
3801	            </element>
3802	           </define>

3804	           <define name="anyExtension">
3805	            <zeroOrMore>
3806	             <choice>
3807	              <attribute>
3808	               <anyName/>
3809	              </attribute>
3810	              <ref name="any"/>
3811	             </choice>
3812	            </zeroOrMore>

3814	           </define>

3816	           <define name="any">
3817	            <element>
3818	             <anyName/>
3819	             <zeroOrMore>
3820	              <choice>
3821	               <attribute>
3822	                <anyName/>
3823	               </attribute>
3824	               <text/>
3825	               <ref name="any"/>
3826	              </choice>
3827	             </zeroOrMore>
3828	           </element>
3829	           </define>

3831	           <!--
3832	               EXTENSIBILITY ATTRIBUTES
3833	               (re-define this as <empty/>,
3834	                if extensions beyond this spec are not used)
3835	           -->

3837	           <define name="anyAttribute">
3838	            <zeroOrMore>
3839	             <attribute>
3840	              <anyName>
3841	               <except>
3842	                <name ns="http://www.w3.org/XML/1998/namespace">lang
3843	                </name>
3844	                <name ns="">entity</name>
3845	                <name ns="">required-participant</name>
3846	                <name ns="">label</name>
3847	                <name ns="">decision</name>
3848	                <name ns="">name</name>
3849	                <name ns="">policy</name>
3850	                <name ns="">uri</name>
3851	                <name ns="">method</name>
3852	                <name ns="">id</name>
3853	                <name ns="">nickname</name>
3854	               </except>
3855	              </anyName>
3856	             </attribute>
3857	            </zeroOrMore>
3858	           </define>
3859	          </grammar>

3861	Appendix B.  Non-Normative W3C XML Schema

3863	   The non-normative W3C XML schema defines extension elements in the
3864	   "urn:ietf:params:xml:ns:xcon-conference-info" namespace.  Note that
3865	   <xs:any> extensions in this schema are stricter than in the normative
3866	   RELAX NG schema [RELAX], and the normative RELAX NG schema [RELAX]
3867	   allows unordered child elements unlike this schema (and the [RFC4575]
3868	   schema).  Also note that this schema allows also otherwise valid
3869	   extension elements to appear in the non-allowed positions.  Likewise
3870	   the cardinalities of these extension elements can not be constrained
3871	   with this schema.

3873	<?xml version="1.0" encoding="UTF-8"?>
3874	  <xs:schema
3875	     xmlns="urn:ietf:params:xml:ns:xcon-conference-info"
3876	     xmlns:info="urn:ietf:params:xml:ns:conference-info"
3877	     xmlns:xs="http://www.w3.org/2001/XMLSchema"
3878	     attributeFormDefault="unqualified" elementFormDefault="qualified"
3879	     targetNamespace="urn:ietf:params:xml:ns:xcon-conference-info">

3881	    <xs:import namespace="urn:ietf:params:xml:ns:conference-info"
3882	      schemaLocation="rfc4575.xsd"/>

3884	    <xs:import namespace="http://www.w3.org/XML/1998/namespace"
3885	      schemaLocation="http://www.w3.org/2001/03/xml.xsd"/>

3887	    <xs:simpleType name="conference-password">
3888	      <xs:list itemType="xs:string"/>
3889	    </xs:simpleType>
3890	    <xs:element name="mixing-mode" type="mixing-mode-type"/>
3891	    <xs:element name="codecs" type="codecs-type"/>
3892	    <xs:element name="controls" type="controls-type"/>
3893	    <xs:element name="language" type="xs:language"/>
3894	    <xs:element name="allow-sidebars" type="xs:boolean"/>
3895	    <xs:element name="cloning-parent" type="xs:anyURI"/>
3896	    <xs:element name="sidebar-parent" type="xs:anyURI"/>
3897	    <xs:element name="conference-time" type="conference-time-type"/>
3898	    <xs:element name="allow-conference-event-subscription"
3899	      type="xs:boolean"/>
3900	    <xs:element name="to-mixer" type="mixer-type"/>
3901	    <xs:element name="provide-anonymity"
3902	      type="provide-anonymity-type"/>
3903	    <xs:element name="allow-refer-users-dynamically"
3904	      type="xs:boolean"/>
3905	    <xs:element name="allow-invite-users-dynamically"
3906	      type="xs:boolean"/>
3907	    <xs:element name="allow-remove-users-dynamically"
3908	      type="xs:boolean"/>

3910	    <xs:element name="from-mixer" type="mixer-type"/>
3911	    <xs:element name="join-handling" type="join-handling-type"/>
3912	    <xs:element name="user-admission-policy"
3913	      type="user-admission-policy-type"/>
3914	    <xs:element name="allowed-users-list"
3915	      type="allowed-users-list-type"/>
3916	    <xs:element name="deny-users-list" type="deny-users-list-type"/>
3917	    <xs:element name="floor-information" type="floor-information-type"/>

3919	    <!-- CONFERENCE TIME -->

3921	    <xs:complexType name="conference-time-type">
3922	      <xs:sequence>
3923	        <xs:element name="entry"
3924	          minOccurs="0" maxOccurs="unbounded">
3925	          <xs:complexType>
3926	            <xs:sequence>
3927	              <xs:element name="base"
3928	                type="xs:string" minOccurs="1"/>
3929	              <xs:element name="mixing-start-offset" minOccurs="0">
3930	                <xs:complexType>
3931	                  <xs:simpleContent>
3932	                    <xs:extension base="time-type">
3933	                     <xs:attribute name="required-participant"
3934	                       type="role-type" use="required"/>
3935	                      <xs:anyAttribute namespace="##any"
3936	                        processContents="lax"/>
3937	                    </xs:extension>
3938	                  </xs:simpleContent>
3939	                </xs:complexType>
3940	              </xs:element>
3941	              <xs:element name="mixing-end-offset" minOccurs="0">
3942	                <xs:complexType>
3943	                  <xs:simpleContent>
3944	                    <xs:extension base="time-type">
3945	                      <xs:attribute name="required-participant"
3946	                        type="role-type" use="required"/>
3947	                      <xs:anyAttribute namespace="##any"
3948	                        processContents="lax"/>
3949	                    </xs:extension>
3950	                  </xs:simpleContent>
3951	                </xs:complexType>
3952	              </xs:element>
3953	              <xs:element name="can-join-after-offset" type="time-type"
3954	                minOccurs="0"/>
3955	              <xs:element name="must-join-before-offset"
3956	                type="time-type" minOccurs="0"/>
3957	              <xs:element name="request-user" type="time-type"
3958	                minOccurs="0"/>
3959	              <xs:element name="notify-end-of-conference"
3960	                type="xs:integer" minOccurs="0"/>
3961	              <xs:element name="allowed-extend-mixing-end-offset"
3962	                type="xs:boolean" minOccurs="0"/>
3963	              <xs:any namespace="##other" processContents="lax"
3964	                minOccurs="0" maxOccurs="unbounded"/>
3965	            </xs:sequence>
3966	          </xs:complexType>
3967	        </xs:element>
3968	        <xs:any namespace="##other" processContents="lax"
3969	          minOccurs="0" maxOccurs="unbounded"/>
3970	      </xs:sequence>
3971	      <xs:anyAttribute namespace="##any" processContents="lax"/>
3972	    </xs:complexType>

3974	    <!-- TIME TYPE -->

3976	     <xs:simpleType name="time-type">
3977	      <xs:restriction base="xs:dateTime">
3978	        <xs:pattern value=".+T.+Z.*"/>
3979	       </xs:restriction>
3980	     </xs:simpleType>

3982	    <!-- ROLE-TYPE -->

3984	    <xs:simpleType name="role-type">
3985	     <xs:restriction base="xs:string">
3986	      <xs:pattern value="none"/>
3987	      <xs:pattern value="administrator"/>
3988	      <xs:pattern value="moderator"/>
3989	      <xs:pattern value="user"/>
3990	      <xs:pattern value="observer"/>
3991	      <xs:pattern value="participant"/>
3992	      <xs:pattern value=".+"/>
3993	     </xs:restriction>
3994	    </xs:simpleType>

3996	    <!-- MIXING MODE TYPE -->

3998	    <xs:simpleType name="mixing-mode-type">
3999	      <xs:restriction base="xs:string">
4000	        <xs:pattern value="moderator-controlled"/>
4001	        <xs:pattern value="FCFS"/>
4002	        <xs:pattern value="automatic"/>
4003	        <xs:pattern value=".+"/>
4004	      </xs:restriction>
4005	    </xs:simpleType>
4006	    <!-- CODECS TYPE -->

4008	    <xs:complexType name="codecs-type">
4009	      <xs:sequence>
4010	        <xs:element name="codec" type="codec-type"/>
4011	        <xs:any namespace="##other" processContents="lax"
4012	          minOccurs="0" maxOccurs="unbounded"/>
4013	      </xs:sequence>
4014	      <xs:attribute name="decision"
4015	        type="decision-type" use="required"/>
4016	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4017	    </xs:complexType>

4019	    <!-- CODEC TYPE -->

4021	    <xs:complexType name="codec-type">
4022	      <xs:sequence>
4023	        <xs:element name="subtype" type="xs:string" minOccurs="0"/>
4024	        <xs:any namespace="##other" processContents="lax"
4025	          minOccurs="0" maxOccurs="unbounded"/>
4026	      </xs:sequence>
4027	      <xs:attribute name="name"
4028	        type="xs:string" use="required"/>
4029	      <xs:attribute name="policy"
4030	        type="policy-type" use="required"/>
4031	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4032	    </xs:complexType>

4034	    <!-- DECISION TYPE -->

4036	    <xs:simpleType name="decision-type">
4037	      <xs:restriction base="xs:string">
4038	        <xs:pattern value="automatic"/>
4039	        <xs:pattern value="moderator-controlled"/>
4040	        <xs:pattern value=".+"/>
4041	      </xs:restriction>
4042	    </xs:simpleType>

4044	    <!-- POLICY TYPE -->

4046	     <xs:simpleType name="policy-type">
4047	      <xs:restriction base="xs:string">
4048	        <xs:pattern value="allowed"/>
4049	        <xs:pattern value="disallowed"/>
4050	        <xs:pattern value=".+"/>
4051	      </xs:restriction>
4052	     </xs:simpleType>

4054	    <!-- CONTROL TYPE -->

4056	    <xs:complexType name="controls-type">
4057	      <xs:sequence>
4058	        <xs:element name="mute"
4059	          type="xs:boolean" minOccurs="0"/>
4060	        <xs:element name="pause-video"
4061	          type="xs:boolean" minOccurs="0"/>
4062	        <xs:element name="gain"
4063	          type="gain-type" minOccurs="0"/>
4064	        <xs:element name="video-layout"
4065	          type="video-layout-type" default="single-view" minOccurs="0"/>
4066	        <xs:any namespace="##other" processContents="lax"
4067	          minOccurs="0" maxOccurs="unbounded"/>
4068	      </xs:sequence>
4069	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4070	    </xs:complexType>

4072	    <!-- GAIN TYPE -->

4074	    <xs:simpleType name="gain-type">
4075	      <xs:restriction base="xs:integer">
4076	        <xs:minInclusive value="-127"/>
4077	        <xs:maxInclusive value="127"/>
4078	      </xs:restriction>
4079	    </xs:simpleType>

4081	    <!-- VIDEO LAYOUT TYPE -->

4083	    <xs:simpleType name="video-layout-type">
4084	      <xs:restriction base="xs:string">
4085	        <xs:pattern value="single-view"/>
4086	        <xs:pattern value="dual-view"/>
4087	        <xs:pattern value="dual-view-crop"/>
4088	        <xs:pattern value="dual-view-2x1"/>
4089	        <xs:pattern value="dual-view-2x1-crop"/>
4090	        <xs:pattern value="quad-view"/>
4091	        <xs:pattern value="multiple-3x3"/>
4092	        <xs:pattern value="multiple-4x4"/>
4093	        <xs:pattern value="multiple-5x1"/>
4094	        <xs:pattern value="automatic"/>
4095	        <xs:pattern value=".+"/>
4096	      </xs:restriction>
4097	    </xs:simpleType>

4099	    <!-- FLOOR INFORMATION TYPE -->

4101	    <xs:complexType name="floor-information-type">
4102	      <xs:sequence>
4103	        <xs:element name="conference-ID"
4104	          type="xs:unsignedLong" minOccurs="0"/>
4105	        <xs:element name="allow-floor-events"
4106	          type="xs:boolean" default="false" minOccurs="0"/>
4107	        <xs:element name="floor-request-handling"
4108	          type="floor-request-handling-type" minOccurs="0"/>
4109	        <xs:element name="conference-floor-policy"
4110	          type="conference-floor-policy" minOccurs="0"/>
4111	        <xs:any namespace="##other" processContents="lax"
4112	          minOccurs="0" maxOccurs="unbounded"/>
4113	      </xs:sequence>
4114	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4115	    </xs:complexType>

4117	    <!-- FLOOR REQUEST TYPE -->

4119	    <xs:simpleType name="floor-request-handling-type">
4120	      <xs:restriction base="xs:string">
4121	        <xs:pattern value="block"/>
4122	        <xs:pattern value="confirm"/>
4123	        <xs:pattern value=".+"/>
4124	      </xs:restriction>
4125	    </xs:simpleType>

4127	    <!-- CONFERENCE FLOOR POLICY -->

4129	    <xs:complexType name="conference-floor-policy">
4130	      <xs:sequence>
4131	        <xs:element name="floor" maxOccurs="unbounded">
4132	          <xs:complexType>
4133	            <xs:sequence>
4134	              <xs:element name="media-label"
4135	                type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
4136	              <xs:element name="algorithm"
4137	                type="algorithm-type" minOccurs="0"/>
4138	              <xs:element name="max-floor-users"
4139	                type="xs:nonNegativeInteger" minOccurs="0"/>
4140	              <xs:element name="moderator-id"
4141	                type="xs:nonNegativeInteger" minOccurs="0"/>
4142	                <xs:any namespace="##other" processContents="lax"
4143	                  minOccurs="0" maxOccurs="unbounded"/>
4144	            </xs:sequence>
4145	            <xs:attribute name="id" type="xs:string" use="required"/>
4146	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4147	          </xs:complexType>
4148	        </xs:element>
4149	      </xs:sequence>
4150	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4151	    </xs:complexType>

4153	    <!-- ALGORITHM TYPE -->

4155	    <xs:simpleType name="algorithm-type">
4156	      <xs:restriction base="xs:string">
4157	        <xs:pattern value="moderator-controlled"/>
4158	        <xs:pattern value="FCFS"/>
4159	        <xs:pattern value="random"/>
4160	        <xs:pattern value=".+"/>
4161	      </xs:restriction>
4162	    </xs:simpleType>

4164	    <!-- USER ADMISSION POLICY TYPE -->

4166	    <xs:simpleType name="user-admission-policy-type">
4167	      <xs:restriction base="xs:string">
4168	        <xs:pattern value="closedAuthenticated"/>
4169	        <xs:pattern value="openAuthenticated"/>
4170	        <xs:pattern value="anonymous"/>
4171	        <xs:pattern value=".+"/>
4172	      </xs:restriction>
4173	    </xs:simpleType>

4175	    <!-- JOIN HANDLING TYPE -->

4177	    <xs:simpleType name="join-handling-type">
4178	      <xs:restriction base="xs:string">
4179	        <xs:pattern value="block"/>
4180	        <xs:pattern value="confirm"/>
4181	        <xs:pattern value="allow"/>
4182	        <xs:pattern value="authenticate"/>
4183	        <xs:pattern value="directed-operator"/>
4184	        <xs:pattern value=".+"/>
4185	       </xs:restriction>
4186	    </xs:simpleType>

4188	   <!-- DENY USER LIST TYPE -->

4190	    <xs:complexType name="deny-users-list-type">
4191	      <xs:sequence>
4192	        <xs:element name="target" minOccurs="0" maxOccurs="unbounded">
4193	          <xs:complexType>
4194	            <xs:attribute name="uri" use="required" type="xs:anyURI"/>
4195	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4196	          </xs:complexType>
4197	        </xs:element>
4198	        <xs:any namespace="##other" processContents="lax"
4199	          minOccurs="0" maxOccurs="unbounded"/>
4200	      </xs:sequence>
4201	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4202	    </xs:complexType>

4204	     <!-- ALLOWED USERS LIST TYPE -->

4206	    <xs:complexType name="allowed-users-list-type">
4207	      <xs:sequence>
4208	        <xs:element name="target" type="target-type"
4209	          minOccurs="0" maxOccurs="unbounded">
4210	        </xs:element>
4211	        <xs:element name="persistent-list"
4212	          type="persistent-list-type"
4213	          minOccurs="0"/>
4214	        <xs:any namespace="##other" processContents="lax"
4215	          minOccurs="0" maxOccurs="unbounded"/>
4216	      </xs:sequence>
4217	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4218	    </xs:complexType>

4220	    <!-- PERSISTENT LIST TYPE -->

4222	    <xs:complexType name="persistent-list-type">
4223	      <xs:sequence>
4224	        <xs:element name="user" minOccurs="0" maxOccurs="unbounded">
4225	          <xs:complexType>
4226	            <xs:sequence>
4227	              <xs:element name="email" type="xs:string"
4228	                minOccurs="0" maxOccurs="unbounded"/>
4229	              <xs:any namespace="##other" processContents="lax"
4230	                minOccurs="0" maxOccurs="unbounded"/>
4231	            </xs:sequence>
4232	            <xs:attribute name="name"
4233	              use="required" type="xs:anyURI"/>
4234	            <xs:attribute name="nickname"
4235	              use="required" type="xs:string"/>
4236	            <xs:attribute name="id"
4237	              use="required" type="xs:string"/>
4238	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4239	          </xs:complexType>
4240	        </xs:element>
4241	        <xs:any namespace="##other" processContents="lax"
4242	          minOccurs="0" maxOccurs="unbounded"/>
4243	      </xs:sequence>
4244	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4245	    </xs:complexType>
4246	    <!-- TARGET TYPE -->

4248	    <xs:complexType name="target-type">
4249	      <xs:attribute name="uri" use="required"
4250	        type="xs:anyURI"/>
4251	      <xs:attribute name="method" use="required"
4252	        type="method-type"/>
4253	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4254	    </xs:complexType>

4256	    <!-- METHOD TYPE -->

4258	    <xs:simpleType name="method-type">
4259	      <xs:restriction base="xs:string">
4260	        <xs:pattern value="dial-in"/>
4261	        <xs:pattern value="dial-out"/>
4262	        <xs:pattern value="refer"/>
4263	        <xs:pattern value=".+"/>
4264	      </xs:restriction>
4265	    </xs:simpleType>

4267	    <!-- ANONYMITY TYPE -->

4269	    <xs:simpleType name="provide-anonymity-type">
4270	      <xs:restriction base="xs:string">
4271	        <xs:pattern value="private"/>
4272	        <xs:pattern value="semi-private"/>
4273	        <xs:pattern value="hidden"/>
4274	        <xs:pattern value=".+"/>
4275	      </xs:restriction>
4276	    </xs:simpleType>

4278	    <!-- MIXER TYPE -->

4280	    <xs:complexType name="mixer-type">
4281	      <xs:sequence>
4282	        <xs:element name="controls" type="controls-type"
4283	          minOccurs="0" maxOccurs="unbounded"/>
4284	        <xs:any namespace="##other" processContents="lax"
4285	          minOccurs="0" maxOccurs="unbounded"/>
4286	      </xs:sequence>
4287	      <xs:attribute name="name" type="mixer-name-type"
4288	        use="required"/>
4289	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4290	    </xs:complexType>

4292	    <!-- MIXER NAME TYPE -->
4293	    <xs:simpleType name="mixer-name-type">
4294	      <xs:restriction base="xs:string">
4295	        <xs:pattern value="VideoIn"/>
4296	        <xs:pattern value="VideoOut"/>
4297	        <xs:pattern value="AudioOut"/>
4298	        <xs:pattern value="AudioIn"/>
4299	        <xs:pattern value=".+"/>
4300	      </xs:restriction>
4301	    </xs:simpleType>

4303	  </xs:schema>

4305	Authors' Addresses

4307	   Oscar Novo
4308	   Ericsson
4309	   Hirsalantie 11
4310	   Jorvas  02420
4311	   Finland

4313	   Email: Oscar.Novo@ericsson.com

4315	   Gonzalo Camarillo
4316	   Ericsson
4317	   Hirsalantie 11
4318	   Jorvas  02420
4319	   Finland

4321	   Email: Gonzalo.Camarillo@ericsson.com

4323	   David P. Morgan
4324	   Fidelity Investments
4325	   82 Devonshire St, MZ V3C
4326	   Boston, MA  02109-3614
4327	   USA

4329	   Email: Dave.Morgan@fmr.com
4330	   Jari Urpalainen
4331	   Nokia
4332	   Itamerenkatu 11-13
4333	   Helsinki  00180
4334	   Finland

4336	   Phone: +358 7180 37686
4337	   Email: jari.urpalainen@nokia.com