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2	XCON                                                             O. Novo
3	Internet-Draft                                              G. Camarillo
4	Intended status: Standards Track                                Ericsson
5	Expires: October 29, 2011                                      D. Morgan
6	                                                    Fidelity Investments
7	                                                           J. Urpalainen
8	                                                                   Nokia
9	                                                          April 27, 2011

11	 Conference Information Data Model for Centralized Conferencing (XCON)
12	                draft-ietf-xcon-common-data-model-27.txt

14	Abstract

16	   [RFC5239] defines the idea of a centralized conferencing (XCON) as an
17	   association of participants with a central focus.  The state of a
18	   conference is represented by a conference object.  This document
19	   defines an Extensible Markup Language (XML)-based conference
20	   information data model to be used for conference objects.  A
21	   conference information data model is designed to convey information
22	   about the conference and about participation in the conference.  The
23	   conference information data model defined in this document
24	   constitutes an extension of the data format specified in the Session
25	   Initiation Protocol (SIP) Event Package for Conference State
26	   [RFC4575].

28	Status of this Memo

30	   This Internet-Draft is submitted in full conformance with the
31	   provisions of BCP 78 and BCP 79.

33	   Internet-Drafts are working documents of the Internet Engineering
34	   Task Force (IETF).  Note that other groups may also distribute
35	   working documents as Internet-Drafts.  The list of current Internet-
36	   Drafts is at http://datatracker.ietf.org/drafts/current/.

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

43	   This Internet-Draft will expire on October 29, 2011.

45	Copyright Notice

47	   Copyright (c) 2011 IETF Trust and the persons identified as the
48	   document authors.  All rights reserved.

50	   This document is subject to BCP 78 and the IETF Trust's Legal
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52	   (http://trustee.ietf.org/license-info) in effect on the date of
53	   publication of this document.  Please review these documents
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56	   include Simplified BSD License text as described in Section 4.e of
57	   the Trust Legal Provisions and are provided without warranty as
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60	   This document may contain material from IETF Documents or IETF
61	   Contributions published or made publicly available before November
62	   10, 2008.  The person(s) controlling the copyright in some of this
63	   material may not have granted the IETF Trust the right to allow
64	   modifications of such material outside the IETF Standards Process.
65	   Without obtaining an adequate license from the person(s) controlling
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68	   not be created outside the IETF Standards Process, except to format
69	   it for publication as an RFC or to translate it into languages other
70	   than English.

72	Table of Contents

74	   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5
75	   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  7
76	   3.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
77	     3.1.  Data Model Format  . . . . . . . . . . . . . . . . . . . .  7
78	     3.2.  Data Model Namespace . . . . . . . . . . . . . . . . . . .  8
79	     3.3.  The Conference Object Identifier . . . . . . . . . . . . .  8
80	       3.3.1.  Conference Object URI Definition . . . . . . . . . . . 10
81	       3.3.2.  Normalization and Conference Object URI Comparison . . 10
82	     3.4.  Data Model Structure . . . . . . . . . . . . . . . . . . . 10
83	   4.  Data Model Definition  . . . . . . . . . . . . . . . . . . . . 11
84	     4.1.  <conference-info>  . . . . . . . . . . . . . . . . . . . . 15
85	     4.2.  <conference-description> . . . . . . . . . . . . . . . . . 15
86	       4.2.1.  <language> . . . . . . . . . . . . . . . . . . . . . . 16
87	       4.2.2.  <display-text> . . . . . . . . . . . . . . . . . . . . 16
88	       4.2.3.  <subject>  . . . . . . . . . . . . . . . . . . . . . . 16
89	       4.2.4.  <free-text>  . . . . . . . . . . . . . . . . . . . . . 16
90	       4.2.5.  <keywords> . . . . . . . . . . . . . . . . . . . . . . 16
91	       4.2.6.  <allow-sidebars> . . . . . . . . . . . . . . . . . . . 16
92	       4.2.7.  <cloning-parent> . . . . . . . . . . . . . . . . . . . 16
93	       4.2.8.  <sidebar-parent> . . . . . . . . . . . . . . . . . . . 16
94	       4.2.9.  <conference-time>  . . . . . . . . . . . . . . . . . . 17
95	       4.2.10. <conf-uris>  . . . . . . . . . . . . . . . . . . . . . 18
96	       4.2.11. <service-uris> . . . . . . . . . . . . . . . . . . . . 18
97	       4.2.12. <maximum-user-count> . . . . . . . . . . . . . . . . . 19
98	       4.2.13. <available-media>  . . . . . . . . . . . . . . . . . . 19
99	     4.3.  <host-info>  . . . . . . . . . . . . . . . . . . . . . . . 21
100	     4.4.  <conference-state> . . . . . . . . . . . . . . . . . . . . 22
101	       4.4.1.  <allow-conference-event-subscription>  . . . . . . . . 22
102	       4.4.2.  <user-count> . . . . . . . . . . . . . . . . . . . . . 22
103	       4.4.3.  <active> . . . . . . . . . . . . . . . . . . . . . . . 22
104	       4.4.4.  <locked> . . . . . . . . . . . . . . . . . . . . . . . 22
105	     4.5.  <floor-information>  . . . . . . . . . . . . . . . . . . . 22
106	       4.5.1.  <conference-ID>  . . . . . . . . . . . . . . . . . . . 22
107	       4.5.2.  <allow-floor-events> . . . . . . . . . . . . . . . . . 23
108	       4.5.3.  <floor-request-handling> . . . . . . . . . . . . . . . 23
109	       4.5.4.  <conference-floor-policy>  . . . . . . . . . . . . . . 23
110	     4.6.  <users>  . . . . . . . . . . . . . . . . . . . . . . . . . 24
111	       4.6.1.  <join-handling>  . . . . . . . . . . . . . . . . . . . 24
112	       4.6.2.  <user-admission-policy>  . . . . . . . . . . . . . . . 25
113	       4.6.3.  <allowed-users-list> . . . . . . . . . . . . . . . . . 26
114	       4.6.4.  <deny-users-list>  . . . . . . . . . . . . . . . . . . 27
115	       4.6.5.  <user> and Its <user> Sub-elements . . . . . . . . . . 27
116	         4.6.5.1.  <display-text> . . . . . . . . . . . . . . . . . . 28
117	         4.6.5.2.  <associated-aors>  . . . . . . . . . . . . . . . . 29
118	         4.6.5.3.  <provide-anonymity>  . . . . . . . . . . . . . . . 29
119	         4.6.5.4.  <roles>  . . . . . . . . . . . . . . . . . . . . . 29
120	         4.6.5.5.  <languages>  . . . . . . . . . . . . . . . . . . . 29
121	         4.6.5.6.  <cascaded-focus> . . . . . . . . . . . . . . . . . 29
122	         4.6.5.7.  <allow-refer-users-dynamically>  . . . . . . . . . 29
123	         4.6.5.8.  <allow-invite-users-dynamically> . . . . . . . . . 30
124	         4.6.5.9.  <allow-remove-users-dynamically> . . . . . . . . . 30
125	         4.6.5.10. <endpoint> . . . . . . . . . . . . . . . . . . . . 30
126	     4.7.  <sidebars-by-ref>  . . . . . . . . . . . . . . . . . . . . 31
127	     4.8.  <sidebars-by-val>  . . . . . . . . . . . . . . . . . . . . 32
128	   5.  RELAX NG Schema  . . . . . . . . . . . . . . . . . . . . . . . 32
129	   6.  XML Schema Extensibility . . . . . . . . . . . . . . . . . . . 43
130	   7.  XML Example  . . . . . . . . . . . . . . . . . . . . . . . . . 43
131	   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 52
132	   9.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 54
133	     9.1.  Relax NG Schema Registration . . . . . . . . . . . . . . . 54
134	     9.2.  XML Namespace Registration . . . . . . . . . . . . . . . . 54
135	     9.3.  Conference Object Identifier Registration  . . . . . . . . 55
136	     9.4.  Conference User Identifier Registration  . . . . . . . . . 56
137	   10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 57
138	   11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 57
139	     11.1. Normative References . . . . . . . . . . . . . . . . . . . 57
140	     11.2. Informative References . . . . . . . . . . . . . . . . . . 58
141	   Appendix A.  Non-Normative RELAX NG Schema in XML Syntax . . . . . 58
142	   Appendix B.  Non-Normative W3C XML Schema  . . . . . . . . . . . . 86
143	   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 95

145	1.  Introduction

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

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

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

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

185	      ...............................................................
186	      . Conferencing Server                                         .
187	      .       +---------------------------------------------------+ .
188	      .       |       C o n f e r e n c e   o b j e c t           | .
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	      .   | | Conference Information Data Model                |||| .
195	      .   | | +----------------------------------------------+ |||| .
196	      .   | | | Conference description  (times, duration)    | |||| .
197	      .   | | +----------------------------------------------+ |||| .
198	      .   | | +----------------------------------------------+ |||| .
199	      .   | | | Host information                             | |||| .
200	      .   | | +----------------------------------------------+ |||| .
201	      .   | | +----------------------------------------------+ |||| .
202	      .   | | | Conference state                             | |||| .
203	      .   | | +----------------------------------------------+ |||| .
204	      .   | | +----------------------------------------------+ |||| .
205	      .   | | | Floor information                            | |||| .
206	      .   | | +----------------------------------------------+ |||| .
207	      .   | | +----------------------------------------------+ |||| .
208	      .   | | | Membership (users, capacity)                 | |||| .
209	      .   | | +----------------------------------------------+ |||| .
210	      .   | | +----------------------------------------------+ |||| .
211	      .   | | | Sidebars, Etc.                               | |||| .
212	      .   | | +----------------------------------------------+ |||| .
213	      .   | | +----------------------------------------------+ |||| .
214	      .   | | | Etc.                                         | |||| .
215	      .   | | +----------------------------------------------+ |||+ .
216	      .   | +--------------------------------------------------+|+  .
217	      .   +----^------------------^-------------^--------|------+   .
218	      .        |                  |             |        |          .
219	      . +------v-------+ +--------v-----+ +-----v-+ +----v-------+  .
220	      . | Conference   | | Floor        | |       | |            |  .
221	      . | Control      | | Control      | |Foci   | |Notification|  .
222	      . | Server       | | Server       | |       | |Service     |  .
223	      . +-----^--------+ +---^----------+ +-^-----+ +------------+  .
224	      ........|..............|..............|..........|.............
225	              |Conference    |Floor         |Call      |Notification
226	              |Control       |Control       |Signaling |Protocol
227	              |Protocol      |Protocol      |Protocol  |
228	      ........v..............v..............v..........v.............
229	      .     C  o  n  f  e  r  e  n  c  i  n  g     C  l i  e  n  t  .
230	      ...............................................................

232	                 Figure 1: Conference Server Architecture

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

245	2.  Terminology

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

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

257	3.  Overview

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

269	3.1.  Data Model Format

271	   A conference object document is an XML [W3C.REC-xml-20081126]
272	   document.  Conference object documents MUST be based on Extensible
273	   Markup Language (XML) 1.0 and SHOULD be encoded using UTF-8.

275	   The normative description of the syntax of the conference object
276	   document, for use by implementors of parsers and generators, is found
277	   in the RelaxNG schema provided in Section 5.  Compliant messages MUST
278	   meet the requirements of that schema.

280	3.2.  Data Model Namespace

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

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

288	3.3.  The Conference Object Identifier

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

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

309	                            +--------------------------+
310	                            |       Conference         |
311	                            |         Object           |
312	                            |       Identifier         |
313	                            +--------------------------+
314	                            |  xcon:Ji092i@example.com |
315	                            +------+-------------------+
316	                                        |
317	                                        |
318	                                        |
319	                      +-----------------+---------------+
320	                      |                                 |
321	          +-----------+-----------+          +----------+---------+
322	          |   CSP Conference IDs  |          |BFCP 'Conference ID'|
323	          +-----------------------+          +--------------------+
324	          | h323:i092@example.com |          |        i092        |
325	          | tel:+44(0)2920930033  |          +----------+---------+
326	          | sip:i092@example.com  |                     |
327	          +-----------------------+             +-------+--------+
328	                                                | BFCP 'Floor ID'|
329	                                                +----------------+
330	                                                |      543       |
331	                                                |      236       |
332	                                                +----------------+

334	                    Figure 2: Conference Object Mapping

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

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

360	3.3.1.  Conference Object URI Definition

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

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

366	   host and unreserved are defined in RFC3986[RFC3986]

368	   XCON-URI is a URI conference identifier and even though its
369	   construction is similar to a URL, in this case, the XCON-URI can not
370	   be resolved to addresses and/or ports.

372	3.3.2.  Normalization and Conference Object URI Comparison

374	   In order to facilitate the comparison of the XCON-URI identifiers,
375	   all the components of the identifiers MUST be converted to lowercase.
376	   After normalizing the URI strings, the URIs comparison MUST applied a
377	   character-by-character basis as prescribed by RFC3986, Section 6.2.1.

379	   The host construction, as defined in RFC3986 can take the form of an
380	   IP address, which is not conventionally compared on a character-by-
381	   character basis.  The host part of an XCON-URI serves only as an
382	   identifier; that is, it is never used as an address.  The character-
383	   by-character comparison still applies.

385	3.4.  Data Model Structure

387	   The information in this data model is structured in the following
388	   manner.  All the information related to a conference is contained in
389	   a <conference-info> element.  The <conference-info> element contains
390	   the following child elements:

392	   o  The <conference-description> element describes the conference as a
393	      whole.  It has, for instance, information about the URI of the
394	      conference, maximum users allowed in the conference, media
395	      available in the conference, or the time the conference will
396	      start.

398	   o  The <host-info> element contains information about the entity
399	      hosting the conference (e.g., its URI).

401	   o  The <conference-state> element informs the subscribers about the
402	      changes in the overall conference information.

404	   o  The <floor-information> element contains information about the
405	      status of the different floors in the conference.

407	   o  The <users> element describes the membership information as a
408	      whole.  The <users> element contains a set of <user> child
409	      elements, each describing a single participant in the conference.

411	   o  If a participant in the main conference joins a sidebar, a new
412	      element is created in the conference referenced from the
413	      <sidebars-by-ref> element or under one of the <sidebars-by-val>
414	      elements.

416	   Note that some of the elements described above such <conference-
417	   info>, <conference-description>, <sidebars-by-ref>, or <sidebars-by-
418	   val> are not defined in the data model in this specification but are
419	   defined in the data format of [RFC4575].  We describe them here
420	   because they are part of the basic structure of the data model.

422	4.  Data Model Definition

424	   The following non-normative diagram shows the structure of conference
425	   object documents.  The operator "!" preceding an element indicates
426	   that the element is mandatory in the data model.  The operator "*"
427	   following an element indicates that the element is introduced and
428	   defined in this document.  That is, elements without a "*" have
429	   already been defined in [RFC4575].

431	   !<conference-info>
432	        |
433	        |--!<conference-description>
434	        |     |--<language>*
435	        |     |--<display-text>
436	        |     |--<subject>
437	        |     |--<free-text>
438	        |     |--<keywords>
439	        |     |--<allow-sidebars>*
440	        |     |--<cloning-parent>*
441	        |     |--<sidebar-parent>*
442	        |     |--<conference-time>*
443	        |     |      |--<entry>*
444	        |     |      |    |--<base>*
445	        |     |      |    |--<mixing-start-offset>*
446	        |     |      |    |--<mixing-end-offset>*
447	        |     |      |    |--<can-join-after-offset>*
448	        |     |      |    |--<must-join-before-offset>*
449	        |     |      |    |--<request-user>*
450	        |     |      |    |--<notify-end-of-conference>*
451	        |     |      |    |--<allowed-extend-mixing-end-offset>*
452	        |     |           ...
453	        |     |--<conf-uris>
454	        |     |      |--<entry>
455	        |     |      |    |--<uri>
456	        |     |      |    |--<display-text>
457	        |     |      |    |--<purpose>
458	        |     |      |    |--<conference-password>*
459	        |     |      ...
460	        |     |--<service-uris>
461	        |     |      |--<entry>
462	        |     |      |    |--<uri>
463	        |     |      |    |--<display-text>
464	        |     |      |    |--<purpose>
465	        |     |      ...
466	        |     |--<maximum-user-count>
467	        |     |      ...
468	        |     |--<available-media>
469	        |     |      |--!<entry>
470	        |     |      |     |--<display-text>
471	        |     |      |     |--<type>
472	        |     |      |     |--<status>
473	        |     |      |     |--<mixing-mode>*
474	        |     |      |     |--<codecs>*
475	        |     |      |     |    |--<codec>*
476	        |     |      |     |    |    |--<subtype>*
477	        |     |      |     |    |--<codec>*
478	        |     |      |     |    |    |--<subtype>*
479	        |     |      |     |    ...
480	        |     |      |     |--<controls>*
481	        |     |      |     |    |--<mute>*
482	        |     |      |     |    |--<gain>*
483	        |     |      |     |   ...
484	        |     |      |--<entry>
485	        |     |      |     |--<display-text>
486	        |     |      |     |--<type>
487	        |     |      |     |--<status>
488	        |     |      |     |--<mixing-mode>*
489	        |     |      |     |--<codecs>*
490	        |     |      |     |    |--<codec>*
491	        |     |      |     |    |    |--<subtype>*
492	        |     |      |     |    |--<codec>*
493	        |     |      |     |    |    |--<subtype>*
494	        |     |      |     |    ...
495	        |     |      |     |--<controls>*
496	        |     |      |     |    |--<pause-video>*
497	        |     |      |     |    |--<video-layout>*
498	        |     |      |     |   ...
499	        |     |      ...
500	        |
501	        |--<host-info>
502	        |     |--<display-text>
503	        |     |--<web-page>
504	        |     |--<uris>
505	        |     |     |--<entry>
506	        |     |     |    |--<uri>
507	        |     |     |    |--<display-text>
508	        |           ...
509	        |--<conference-state>
510	        |     |--<allow-conference-event-subscription>*
511	        |     |--<user-count>
512	        |     |--<active>
513	        |     |--<locked>
514	        |
515	        |--<floor-information>*
516	        |     |--<conference-ID>*
517	        |     |--<allow-floor-events>*
518	        |     |--<floor-request-handling>*
519	        |     |--<conference-floor-policy>*
520	        |     |     |--<floor>*
521	        |     |     |    |--!<media-label>*
522	        |     |     |    |--!<algorithm>*
523	        |     |     |    |--<max-floor-users>*
524	        |     |     |    |--<moderator-id>*
525	        |     |     |   ...
526	        |     |     ...
527	        |
528	        |--!<users>
529	        |     |--<join-handling>*
530	        |     |--<user-admission-policy>*
531	        |     |--<allowed-users-list>*
532	        |     |     |--<target>*
533	        |     |     |
534	        |     |     |--<persistent-list>*
535	        |     |     |     |--<user>*
536	        |     |     |     |     |-- <email>*
537	        |     |
538	        |     |--<deny-users-list>*
539	        |     |
540	        |     |--<user>
541	        |     |    |--<display-text>
542	        |     |    |--<associated-aors>
543	        |     |    |--<provide-anonymity>*
544	        |     |    |--<roles>
545	        |     |    |    |
546	        |     |    |   ...
547	        |     |    |--<languages>
548	        |     |    |--<cascaded-focus>
549	        |     |    |--<allow-refer-users-dynamically>*
550	        |     |    |--<allow-invite-users-dynamically>*
551	        |     |    |--<allow-remove-users-dynamically>*
552	        |     |    |--!<endpoint>
553	        |     |    |      |--<display-text>
554	        |     |    |      |--<referred>
555	        |     |    |      |--<status>
556	        |     |    |      |--<joining-method>
557	        |     |    |      |--<joining-info>
558	        |     |    |      |--<disconnection-method>
559	        |     |    |      |--<disconnection-info>
560	        |     |    |      |--<media>
561	        |     |    |      |    |--<type>
562	        |     |    |      |    |--<display-text>
563	        |     |    |      |    |--<label>
564	        |     |    |      |    |--<src-id>
565	        |     |    |      |    |--<status>
566	        |     |    |      |    |--<to-mixer>*
567	        |     |    |      |    |      |--<floor>*
568	        |     |    |      |    |      |--<controls>*
569	        |     |    |      |    |      |      |--<mute>*
570	        |     |    |      |    |      |      |--<gain>*
571	        |     |    |      |    |      |     ...
572	        |     |    |      |    |--<from-mixer>*
573	        |     |    |      |    |      |--<floor>*
574	        |     |    |      |    |      |--<controls>*
575	        |     |    |      |    |      |      |--<pause-video>*
576	        |     |    |      |    |      |     ...
577	        |     |    |      |   ...
578	        |     |    |      |--<call-info>
579	        |     |    |      |    |--<sip>
580	        |     |    |      |    |   |--<display-text>
581	        |     |    |      |    |   |--<call-id>
582	        |     |    |      |    |   |--<from-tag>
583	        |     |    |      |    |   |--<to-tag>
584	        |          ...    ...
585	        |--<sidebars-by-ref>
586	        |     |--<entry>
587	        |     |     |-- <user>
588	        |     |     |-- <display-text>
589	        |     |--<entry>
590	        |     |     |-- <user>
591	        |     |     |-- <display-text>
592	        |     ...
593	        |--<sidebars-by-val>
594	        |     |--<entry>
595	        |     |     |
596	        |     |    ...
597	        |     |--<entry>
598	        |     |     |
599	        |     ...   ...

601	                      Figure 3: Non-normative diagram

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

606	4.1.  <conference-info>

608	   A conference object document begins with the root element
609	   <conference-info>, which is defined in [RFC4575].  The <conference-
610	   info> attributes are described in [RFC4575].  Note that the
611	   <conference-info> element does not have the attributes 'state' and
612	   'version' defined in [RFC4575] for this element because these
613	   attributes only apply to notification mechanisms.

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

619	   The <conference-info> element contains the <conference-description>,
620	   <host-info>, <conference-state>, <floor-information>, <users>,
621	   <sidebars-by-ref>, and <sidebars-by-val> child elements.  All these
622	   elements, except <floor-information>, are defined in [RFC4575].  A
623	   conference document MUST at least include the <conference-
624	   description> and <users> child elements.

626	4.2.  <conference-description>

628	   The <conference-description> element, which is defined in [RFC4575],
629	   describes the conference as a whole.  It SHOULD have an attribute
630	   'lang' to specify the language used in the contents of this element.
631	   It is comprised of <language>, <display-text>, <subject>, <free-
632	   text>, <keywords>, <allow-sidebars>, <cloning-parent>, <sidebar-
633	   parent>, <conference-time>, <conf-uris>, <service-uris>, <maximum-
634	   user-count>, and <available-media>.

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

640	4.2.1.  <language>

642	   The <language> element indicates the predominant language that is
643	   expected to be employed within a conference.  The possible values of
644	   this element are the values of the 'Subtag' column of the [RFC5646]
645	   defined in IANA [IANA-Lan].  This element does not enforce the
646	   language of the conference, but only informs the participants about
647	   the desirable language that they should use in the conference.
648	   Participants are free to switch to other languages if they like.

650	4.2.2.  <display-text>

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

654	4.2.3.  <subject>

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

658	4.2.4.  <free-text>

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

662	4.2.5.  <keywords>

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

666	4.2.6.  <allow-sidebars>

668	   The <allow-sidebars> element represents a boolean value.  If set to
669	   TRUE, the conference is allowed to create sidebar conferences.  If
670	   absent, or set to FALSE, the conference can not create sidebar
671	   conferences.

673	4.2.7.  <cloning-parent>

675	   When the <cloning-parent> is present, it indicates that the
676	   conference object is a child of a parent conference.  The <cloning-
677	   parent> element contains the conference object Identifier (XCON-URI)
678	   (different from the main XCON-URI) of the parent.

680	4.2.8.  <sidebar-parent>

682	   When the <sidebar-parent> is present, it indicates that the
683	   conference object represents a sidebar of another conference.  The
684	   <sidebar-parent> element contains the conference object Identifier
685	   (XCON-URI) (different from the main XCON-URI) of the parent.

687	4.2.9.  <conference-time>

689	   The <conference-time> element contains the information related to
690	   conference time, policy, and duration of a conference.  The
691	   <conference-time> element contains one or more <entry> elements each
692	   defining the time and policy information specifying a single
693	   conference occurrence.  The <conference-time> element differs from
694	   the iCalendar objects [RFC5545] in the possibility to define
695	   different policies (<can-join-after-offset>, <must-join-before-
696	   offset>) for the same conference at different times.

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

700	   o  <base>: The <base> child element specifies the iCalendar object of
701	      the conference.  The iCalendar object components are defined in
702	      [RFC5545].

704	   o  <mixing-start-offset>: The <mixing-start-offset> child element
705	      specifies when the conference media mixing starts before the
706	      conference starts.  If the <mixing-start-offset> element is not
707	      present, it indicates that the conference media mixing starts
708	      immediately.  The <mixing-start-offset> has the mandatory
709	      'required-participant' attribute.  This attribute contains one of
710	      the following values: "none", "administrator", "moderator",
711	      "user", "observer", and "participant".  The roles' semantic
712	      definitions are out of the scope of this document and is subject
713	      to future policy documents.  More values can be specified in the
714	      future.  The 'required-participant' attribute allows a privileged
715	      user to define when media mixing starts based on the latter of the
716	      mixing start time, and the time the first participant arrives.  If
717	      the value is set to "none'", mixing starts according to the mixing
718	      start time.

720	   o  <mixing-end-offset>: The <mixing-end-offset> child element
721	      specifies the time conference media mixing stops after the
722	      conference stops.  If the <mixing-end-offset> element is not
723	      present, it indicates that the conference occurrence is not
724	      bounded.  The <mixing-end-offset> element has the mandatory
725	      'required-participant' attribute.  This attribute contains one of
726	      the following values: "none", "administrator", "moderator",
727	      "observer", "user", and "participant".  More values can be
728	      specified in the future.  The 'required-participant' attribute
729	      allows a privileged user to define when media mixing ends based on
730	      the earlier of the <mixing-end-offset>, and the time the last
731	      participant leaves.  If the value is set to "none", mixing stops
732	      according to the <mixing-end-offset>.  If the conference policy
733	      was modified so that last privileged user is now a normal
734	      conference participant, and the conference requires a privileged
735	      user to continue; that conference MUST terminate.

737	   o  <can-join-after-offset>: An administrator can indicate the time
738	      when users can join a conference by populating the <can-join-
739	      after-offset> element.

741	   o  <must-join-before-offset>: An administrator can define the time
742	      after which new users are not allowed to join the conference
743	      anymore.

745	   o  <request-user>: It defines the time when users or resources on the
746	      <allowed-users-list> are requested to join the conference by using
747	      the <request-users> element.

749	   o  <notify-end-of-conference>: The <notify-end-of-conference> element
750	      defines in seconds when the system MUST send a notification when
751	      the end of the conference is approaching.  If the <notify-end-of-
752	      conference> element is not present, it indicates that the system
753	      does not notify the users when the end of the conference is
754	      approaching.

756	   o  <allowed-extend-mixing-end-offset>: The <allowed-extend-mixing-
757	      end-offset> element indicates if the conference is allowed to be
758	      extended.  It has a boolean value.

760	4.2.10.  <conf-uris>

762	   The <conf-uris> element contains the identifiers to be used in order
763	   to access the conference by different signaling means.  This element
764	   contains a set of <entry> child elements - each containing a new
765	   element, <conference-password>.  This element contains the
766	   password(s) of the conference, for instance, PSTN conference will
767	   store the 'PIN code' in this element.  All the other <conf-uris>
768	   child element are described in section 5.3.1 of [RFC4575].

770	   The schema in Section 5 allows <conference-password> to appear
771	   anywhere uris-type is expanded.  This document only provides meaning
772	   for <conference-password> appearing as a descendent of the <conf-
773	   uris> element.  Future standardization may give meaning to
774	   <conference-password> appearing in other elements of type uris-type.
775	   In the absence of such standardization, <conference-password> MUST
776	   NOT appear in elements of type uris-type other than <conf-uris>.

778	4.2.11.  <service-uris>

780	   The <service-uris> describes auxiliary services available for the
781	   conference.  The <service-uris> element is described in section 5.3.2
782	   of [RFC4575].

784	4.2.12.  <maximum-user-count>

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

791	4.2.13.  <available-media>

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

799	   o  The <type> element is described in section 5.3.4 of [RFC4575].

801	   o  The <display-text> element is described in section 5.3.4 of
802	      [RFC4575].

804	   o  The <status> element is described in section 5.3.4 of [RFC4575].

806	   o  The child element <mixing-mode> describes a default scheduling
807	      policy by which the mixer will build the outgoing stream from the
808	      incoming streams.  Note that this policy is different than the
809	      policy describing the floors for each media.  The <mixing-mode>
810	      child element MUST contain one and only one of the "Moderator-
811	      controlled", "FCFS", and "Automatic" values, indicating the
812	      default algorithm to use with every media stream.  The "Moderator-
813	      controlled" value indicates that the moderator of the conference,
814	      controls the media stream policy.  The "FCFS" value indicates a
815	      'first-come-first-served' policy.  The "Automatic" value means the
816	      mixer choose the best scheduling policy for the conference.

818	   o  The <codecs> element specifies the allowed codecs in the
819	      conference.  It has an attribute 'decision' that specifies if the
820	      focus decides the common codec automatically or needs the approval
821	      of the moderator of the conference ("automatic", "moderator-
822	      controlled").  The <codecs> element contains <codec> elements.  A
823	      <codec> element can have the attribute 'name' and 'policy'.  The
824	      'name' attribute is a codec identifier assigned by the
825	      conferencing server.  The 'policy' attribute contains the policy
826	      for that codec (allowed, or disallowed).  The <codec> element has
827	      the child element <subtype> which stores the codec's name.  The
828	      possible values of this element are the values of the 'subtype'
829	      column of the RTP Payload Format media types per [RFC4855] defined
830	      in IANA [IANA].  It is expected that future conferencing
831	      specifications will define corresponding schema extensions, as
832	      appropriate.

834	   o  The <controls> element contains the basic audio and video global
835	      control elements for a conference.  These controls are sufficient
836	      for the majority of basic conferences.  If the conference server
837	      wants to support more advanced controls, then it is RECOMMENDED
838	      that an extension to the data model be used.  In the <controls>
839	      element the schema is extensible, hence new control types can be
840	      added in the future.  So moderator controls that affect all media
841	      output would go under the <available-media> element.  The
842	      following controls elements are defined for <controls>:

844	      *  The <mute> element is used in conjunction with an audio stream
845	         to cease transmission of any audio from the associated stream.
846	         That means that for the entire duration where mute is
847	         applicable, all current and future participants of the
848	         conference are muted and will not receive any audio.  It has a
849	         "boolean" value.  If this control is not specified, access to
850	         the control is not available to the client.

852	      *  The <pause-video> element is used in conjunction with a video
853	         stream to cease transmission of associated media.  It has a
854	         "boolean" value.  If this control is not specified, the access
855	         to the control is not available to the client.

857	      *  The <gain> element is used in conjunction with a media output
858	         stream to indicate the amount of amplification of an audio
859	         stream.  The value is an integer number that ranges from -127
860	         to 127.  If this control is not specified, access to the
861	         control is not available to the client.

863	      *  The <video-layout> element is used in conjunction with a video
864	         stream to specify how the video streams (of participants) are
865	         viewed by each participant.  Only one layout type can be
866	         specified for each output stream.  If there are fewer
867	         participants than panels in the specified layout, then blanking
868	         (black screen) MAY be mixed into the stream on the behalf of
869	         the missing input streams.  If unspecified, the <video-layout>
870	         default type SHOULD be "single-view".  The <video-layout> types
871	         are as follows, although any number of custom layouts may be
872	         specified in future extensions:

874	         +  single-view: Only one stream is presented by the focus to
875	            all participants in one panel.

877	         +  dual-view: This dual view option will present the video
878	            side-by-side in 2 panels and not alter the aspect ratio of
879	            the streams.  This will require the focus to introduce
880	            blanking on parts of the overall image as viewed by the
881	            participants.

883	         +  dual-view-crop: This side-by-side layout option instructs
884	            the focus to alter the aspect ratio of the streams (alter-
885	            aspect-ratio=TRUE) so that blanking is not necessary.  The
886	            focus handles the cropping of the streams.

888	         +  dual-view-2x1: This layout option instructs the focus to
889	            place one stream above the other, in essence with two rows
890	            and one column.  In this option the aspect ratio is not
891	            altered and blanking is introduced.

893	         +  dual-view-2x1-crop: This layout option also instructs the
894	            focus to place one stream above the other, in essence with
895	            two rows and one column.  In this option the aspect ratio is
896	            altered and the video streams are cropped.

898	         +  quad-view: Four equal-sized panels in a 2x2 layout is
899	            presented by the focus to all participants.  Typically the
900	            aspect ratio of the streams are maintained (alter-aspect-
901	            ratio= FALSE).

903	         +  multiple-3x3: Nine equal-sized panels in a 3x3 layout is
904	            presented by the focus to all participants.  Typically the
905	            aspect ratio of the streams are preserved.

907	         +  multiple-4x4: Sixteen equal-sized panels in a 4x4 layout is
908	            presented by the focus to all participants.  Typically the
909	            aspect ratio of the streams are preserved.

911	         +  multiple-5x1: This option refers to a 5x1 layout where one
912	            panel will occupy 4/9 of the mixed video stream while the
913	            others will each occupy 1/9 of the stream.  Typically the
914	            aspect ratio of the streams is preserved.

916	         +  automatic: This option allows the focus to add panels as
917	            streams are added.

919	4.3.  <host-info>

921	   The <host-info> element contains information about the entity hosting
922	   the conference.  This information is usually set before conference
923	   activation, and is rarely changed during the conference lifetime.
924	   The <host-info> element and its child elements are described in
925	   [RFC4575], section 5.4.  Future extensions to the <host-info> element
926	   may define new values.

928	4.4.  <conference-state>

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

934	4.4.1.  <allow-conference-event-subscription>

936	   The <allow-conference-event-subscription> element represents a
937	   boolean action.  If set to TRUE, the focus is instructed to allow the
938	   subscription to conference state events, such as 'SIP Event Package
939	   for Conference State' [RFC4575].  If set to FALSE, the subscription
940	   to conference state events MUST be rejected.  If this element is
941	   undefined it has a default value of TRUE, causing the subscription to
942	   conference state events to be accepted.

944	4.4.2.  <user-count>

946	   The <user-count> child element is explained in [RFC4575], section
947	   5.5.1.

949	4.4.3.  <active>

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

953	4.4.4.  <locked>

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

957	4.5.  <floor-information>

959	   The <floor-information> element contains the <conference-ID>, <allow-
960	   floor-events>, <floor-request-handling>, and <conference-floor-
961	   policy> child elements.  The absence of this element from an XML
962	   document indicates that the conference does not have a floor.

964	4.5.1.  <conference-ID>

966	   The <conference-ID> represents a conference instance within floor
967	   control.  When BFCP serves as the floor control protocol, the
968	   <conference-ID> is a 32-bit BFCP conference identifier defined in
969	   [RFC4582] section 5.1.  Note that when created within the
970	   conferencing system, there is a 1:1 mapping between this
971	   <conference-ID> and the unique conference object Identifier (XCON-
972	   URI).

974	4.5.2.  <allow-floor-events>

976	   The <allow-floor-events> element represents a boolean action.  If set
977	   to TRUE, the focus is instructed to accept the subscription to floor
978	   control events.  If set to FALSE, the focus is instructed to reject
979	   the subscription.  If this element is undefined, it has a default
980	   value of FALSE, causing the subscription to floor control events to
981	   be rejected.

983	   A conference participant can subscribe himself to a floor control
984	   event in two different ways: one method is using an offer/answer
985	   exchange mechanism ([RFC3264]) using SIP INVITE and BFCP parameters
986	   in the SDP ([RFC4583]), the other method is a general authorization
987	   mechanism described in section 9 of [RFC4582] and in [RFC5018].
988	   Future documentation may define additional connection mechanisms.

990	4.5.3.  <floor-request-handling>

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

997	   o  "block": This action instructs the focus to deny the floor
998	      request.  This action is the default action taken in the absence
999	      of any other actions.

1001	   o  "confirm": This action instructs the focus to allow the request.
1002	      The focus then uses the defined floor algorithm to further allow
1003	      or deny the floor.  The algorithms used are outside the scope of
1004	      this document.

1006	   Note that this section discusses floor control information,
1007	   therefore, the value "block" in a <floor-request-handling> element is
1008	   not related with the "block" value in the <join-handling> element
1009	   (see Section 4.6).

1011	4.5.4.  <conference-floor-policy>

1013	   The <conference-floor-policy> element has one or more <floor> child
1014	   elements.  Every <floor> child elements has an attribute 'id' which
1015	   uniquely identifies a floor within a conference.  In the case of BFCP
1016	   [RFC4582], the 'id' attribute corresponds to the floor-id identifier
1017	   defined in [RFC4582] section 5.2.2.

1019	   o  <media-label>: Every floor is identified for one or more mandatory
1020	      <media-label> element.  If the <available-media> information is
1021	      included in the conference document, the value of this element
1022	      MUST be equal to the 'label' value of the corresponding media
1023	      stream <entry> in the <available-media> container.  The number of
1024	      those elements indicates how many floors the conference can have.
1025	      A floor can be used for one or more media types;

1027	   o  <algorithm>: A floor can be controlled using many algorithms; the
1028	      mandatory <algorithm> element MUST be set to any of the
1029	      "moderator-controlled", "FCFS" or "random" values indicating the
1030	      algorithm.  The "Moderator-controlled" value indicates that the
1031	      moderator of the conference controls the floor.  The "FCFS" value
1032	      states for 'first-come-first-served' floor control.

1034	   o  <max-floor-users>: The <max-floor-users> child element in the
1035	      <floor> element is optional and, if present, dictates the maximum
1036	      number of users who can have the floor at one time.

1038	   o  <moderator-id>: The optional <moderator-id> indicates the 'User
1039	      ID' of the moderator(s).  It MUST be set if the element
1040	      <algorithm> is set to "Moderator-controlled" value.  When the
1041	      floor is created within the conferencing system, the XCON-User
1042	      identifier MAY be used as the moderator-id.  In the case of BFCP
1043	      as the floor control protocol, the <moderator-id> is defined in
1044	      [RFC4582] section 3.  Note that [RFC4582] refers to the moderator
1045	      role as a 'floor chair'.

1047	4.6.  <users>

1049	   The <users> element is described in [RFC4575] and contains the <join-
1050	   handling>, <user-admission-policy>, <allowed-users-list> and <deny-
1051	   users-list> defined in this document and <user> child elements
1052	   defined in [RFC4575].  Note that the <users> element does not have
1053	   the attribute 'state' defined in [RFC4575] for this element because
1054	   this attribute only applies to notification mechanisms.  The
1055	   following sections describe these elements in more detail.  Other
1056	   child elements and attributes can be used to extend <users> in the
1057	   future.

1059	4.6.1.  <join-handling>

1061	   The <join-handling> element defines the actions used by the
1062	   conference focus to control conference participation.  This element
1063	   defines the action that the focus is to take when processing a
1064	   particular request to join a conference.  This element defines values
1065	   of:
1066	   o  "block": This action instructs the focus to deny access to the
1067	      conference.  This action is the default action taken in the
1068	      absence of any other actions.

1070	   o  "confirm": This action instructs the focus to place the
1071	      participant on a pending list (e.g., by parking the call on a
1072	      music-on-hold server), awaiting moderator input for further
1073	      actions.

1075	   o  "allow": This action instructs the focus to accept the conference
1076	      join request and grant access to the conference within the
1077	      instructions specified in the transformations of this rule.

1079	   o  "authenticate": This action instructs the focus that the user has
1080	      to provide a combination of username/password.

1082	   o  "directed-operator": This action instructs the focus to direct the
1083	      user to an operator.

1085	4.6.2.  <user-admission-policy>

1087	   The <user-admission-policy> is an element that lets an organizer (or
1088	   a participant with appropriate rights) choose a policy for the
1089	   conference that controls how users are authenticated into the
1090	   conference, using a mechanism of the conference's choosing.  Since a
1091	   variety of signaling protocols are possible, a variety of
1092	   authentication mechanism - determined by every individual conference
1093	   servers - may need to be mapped from the different protocols.  The
1094	   specific types of authentication mechanism are beyond the scope of
1095	   this document.  The list of possible values are:

1097	   o  "closedAuthenticated": A 'closedAuthenticated' policy MUST have
1098	      each conference participant in the allowed users list (listed
1099	      under the <allowed-users-list> element) with each participant
1100	      being sufficiently (up to local policy) authenticated.  Conference
1101	      join requests for users not in the allowed users list or
1102	      participants not authenticated should be rejected unless a <join-
1103	      handling> action of 'confirm' is selected in which case the user
1104	      is placed on a pending list as indicated earlier.  A
1105	      'closedAuthenticated' policy MUST NOT include a <deny-users-list>.
1106	      If <deny-users-list> appears in the data model, it MUST be
1107	      ignored.

1109	   o  "openAuthenticated": An 'openAuthenticated' policy requires each
1110	      conferencing participant to be sufficiently authenticated.
1111	      Typically this implies that anyone capable of authenticating with
1112	      the conferencing system may join the conference.  The
1113	      'openAuthenticated' policy permits the specification of "banned"
1114	      conferencing participants.  Such banned users are prevented from
1115	      re-joining the conference until they have been un-banned.  An
1116	      'openAuthenticated' policy SHOULD have a deny users list (listed
1117	      under the <deny-users-list> XML element) to support banning of
1118	      conferencing participants from a conference.  An
1119	      'openAuthenticated' policy MUST NOT include an <allowed-users-
1120	      list>.  If <allowed-users-list> appears in the data model, it MUST
1121	      be ignored.

1123	   o  "anonymous": An 'anonymous' policy allows any join requests in and
1124	      is the least restrictive policy.  An 'anonymous' policy MUST NOT
1125	      include either an <allowed-users-list> or a <deny-users-list>.  If
1126	      any of these lists appear in the data model, they MUST be ignored.

1128	   In all other cases, the appearance of an <allowed-users-list> and
1129	   <deny-users-list> MUST be ignored, except as otherwise described in a
1130	   future specification.  Future specifications describing the use of
1131	   these lists must provide clear guidance on how to process the lists
1132	   when they occur concurrently, especially when both lists contain the
1133	   same user.  For example, such specification could disallow both list
1134	   from appearing at the same time similar to user-admission-policy
1135	   values defined in this document.

1137	4.6.3.  <allowed-users-list>

1139	   The <allowed-users-list> child element contains a list of user URIs
1140	   (e.g. xcon-userid defined in Section 4.6.5), roles (defined in
1141	   Section 4.6.5.4), or domains (e.g.: *@example.com) that the focus
1142	   uses to determine who can join the conference, who can be invited to
1143	   join a conference, or who the focus needs to "refer to" the
1144	   conference.  The <allowed-users-list> element includes zero or more
1145	   <target> child elements.  This child element includes the mandatory
1146	   'uri' attribute and the mandatory 'method' attribute.  The same 'uri'
1147	   attribute with different method values can appear in the list more
1148	   than once.

1150	   The 'method' attribute is a list with the following values:

1152	   o  "dial-in": The value "dial-in" is used by the focus to determine
1153	      who can join the conference.

1155	   o  "dial-out": The value "dial-out" contains a list of resources that
1156	      the focus will initiate a session with.

1158	   o  "refer": The value "refer" is used by the focus to determine the
1159	      resources that the focus needs to "refer to" the conference.  In
1160	      SIP, this is achieved by the focus sending a REFER request to
1161	      those potential participants.  In a different paradigm, this could
1162	      also mean that the focus sends an SMS or an email to the referred
1163	      user.  This list can be updated during the conference lifetime so
1164	      it can be used for mid-conference refers as well.

1166	   The "refer" value differs from the "dial-out" in that the resources
1167	   on the "refer" value are expected to initiate the session
1168	   establishment toward the focus themselves.  It is also envisioned
1169	   that different users will have different access rights to those lists
1170	   and therefore a separation between the two is needed.

1172	   The <allowed-users-list> element has a <persistent-list> child
1173	   element as well.  Some chatroom systems allow -- and some require --
1174	   registration of detailed information about a user before they are
1175	   allowed to join a chatroom.  The <persistent-list> child element
1176	   stores persistent information about users who are not actively part
1177	   of an ongoing chatroom session.  The <persistent-list> element stores
1178	   the following information:

1180	   o  user: The <user> element stores the name, nickname, the conference
1181	      user identifier (XCON-USERID) and email address of a user.  It has
1182	      three attributes: 'name', 'nickname' and 'id' and an <email>
1183	      element.  Future extensions to this schema may define new elements
1184	      for the <user> element.

1186	   Future extensions to this schema may define new elements for the
1187	   <target> element.

1189	4.6.4.  <deny-users-list>

1191	   The <deny-users-list> child element contains a list of user URIs
1192	   (e.g.  SIP URI, xcon-userid defined in Section 4.6.5), roles (defined
1193	   in Section 4.6.5.4), or domains (e.g.: *@example.com) that the focus
1194	   uses to determine who has been 'banned' from the conference.  Such
1195	   banned users are prevented from re-joining the chatroom until they
1196	   have been un-banned.

1198	4.6.5.  <user> and Its <user> Sub-elements

1200	   The element <user> is described in [RFC4575] and describes a single
1201	   participant in the conference.  The <user> element has an attribute
1202	   'entity'.  Note that the <user> element does not have the attribute
1203	   'state' defined in [RFC4575] for this element because this attribute
1204	   only applies to notifications mechanism.

1206	   The attribute 'entity' contains a unique conference user identifier
1207	   (XCON-USERID) within the scope of the conference.  The URI format of
1208	   this identifier is as follow:

1210	    XCON-USERID = "xcon-userid" ":" conf-user-id

1212	    conf-user-id = 1*unreserved

1214	   [unreserved is defined in RFC3986]

1216	   In order to facilitate the comparison of the XCON-USERID identifiers,
1217	   all the components of the identifiers MUST be converted to lowercase.
1218	   After normalizing the URI strings, the URIs comparison MUST applied a
1219	   character-by-character basis as prescribed by RFC3986, Section 6.2.1.

1221	   Other user identifiers can be associated with this conference user
1222	   identifier and enable the conferencing system to correlate and map
1223	   these multiple authenticated user identities to a single global user
1224	   identifier.  Figure 4 illustrates an example using the conference
1225	   user identifier in association with the user identity defined for
1226	   BFCP, SIP, and H323 user identity.  It should be noted that a
1227	   conferencing system is free to structure such relationships as
1228	   required and this information is just included as a guideline.

1230	                         +----------------+
1231	                         |   Conference   |
1232	                         |      User      |
1233	                         |   Identifier   |
1234	                         +----------------+
1235	                         |xcon-userid:John|
1236	                         +-------+--------+
1237	                                 |
1238	                                 |
1239	                                 |
1240	          +----------------------+-------------------------+
1241	          |                      |                         |
1242	  +-------+--------+ +-----------+-----------+ +-----------+-----------+
1243	  |  BFCP User ID  | |      SIP User URI     | |     H323 User URI     |
1244	  +----------------+ +-----------------------+ +-----------------------+
1245	  |      543       | |sip:851221@example.com | |h323:taeduk@example.com|
1246	  +----------------+ +-----------------------+ +-----------------------+

1248	                     Figure 4: Conference User Mapping

1250	   The element <user> element contains the <display-text>, <associated-
1251	   aors>, <provide-anonymity>, <roles>, <languages>, <cascaded-focus>,
1252	   <allow-refer-users-dynamically>, <allow-invite-users-dynamically>,
1253	   <allow-remove-users-dynamically>, and <endpoint>.  The following
1254	   sections describe these elements in more detail.

1256	4.6.5.1.  <display-text>

1258	   The <display-text> child element is explained in [RFC4575], section
1259	   5.6.1.

1261	4.6.5.2.  <associated-aors>

1263	   The <associated-aors> child element is explained in [RFC4575],
1264	   section 5.6.2.

1266	4.6.5.3.  <provide-anonymity>

1268	   The <provide-anonymity> element specifies what level of anonymity the
1269	   server should provide to the user.  In this case, the focus provides
1270	   to the rest of the participants an anonymous identity for that user,
1271	   for example anonymousX, or it does not provide any information for
1272	   that user such that other users can not see he is a participant in
1273	   the conference.  This element only affects the way the user
1274	   information is provided to the other participants.  The real user
1275	   information is stored in the data model but SHOULD NOT be provided to
1276	   the other participants of the conference.  This can be achieved by
1277	   using the <provide-anonymity> element.  This element has three
1278	   values: 'private', 'semi-private' and 'hidden'.  The 'private' value
1279	   specifies that this user is completely anonymous in the conference.
1280	   'semi-private' value specifies that this user is anonymous to all
1281	   users who have not been granted permission to see him. 'hidden' value
1282	   specifies that other users can not see this participant in the
1283	   conference.

1285	4.6.5.4.  <roles>

1287	   A role provides the context for the set of conference operations that
1288	   a participant can perform.  This element can contain one or more of
1289	   the following values: "administrator", "moderator", "user",
1290	   "participant", "observer", and "none".  A role of "none" indicates
1291	   that any role is assigned; The roles semantic definition is out of
1292	   the scope of this document and is subject to future policy documents.
1293	   This element can be extended with new roles in future documents.

1295	4.6.5.5.  <languages>

1297	   The <languages> child element is explained in [RFC4575], section
1298	   5.6.4.

1300	4.6.5.6.  <cascaded-focus>

1302	   The <cascaded-focus> child element is explained in [RFC4575], section
1303	   5.6.5.

1305	4.6.5.7.  <allow-refer-users-dynamically>

1307	   The <allow-refer-users-dynamically> element represents a boolean
1308	   value.  If set to TRUE, a participant is allowed to instruct the
1309	   focus to refer a user to the conference without modifying the
1310	   <allowed-users-list> (in SIP terms, a participant is allowed to send
1311	   a REFER request [RFC3515] to the focus which results in the focus
1312	   sending a REFER request to the user the referrer wishes to join the
1313	   conference).  If set to FALSE, the refer request is rejected.  If
1314	   this element is undefined it has a value of FALSE, causing the refer
1315	   to be rejected.

1317	4.6.5.8.  <allow-invite-users-dynamically>

1319	   The <allow-invite-users-dynamically> element represents a boolean
1320	   action.  If set to TRUE, a participant is allowed to instruct the
1321	   focus to invite a user to the conference without modifying the
1322	   <allowed-users-list> list (in SIP terms, a participant is allowed to
1323	   send a REFER request [RFC3515] to the focus which results in the
1324	   focus sending an INVITE request to the user the referrer wishes to
1325	   join the conference).  If set to FALSE, the refer request is
1326	   rejected.  If this element is undefined it has a value of FALSE,
1327	   causing the refer to be rejected.

1329	4.6.5.9.  <allow-remove-users-dynamically>

1331	   The <allow-remove-users-dynamically> element represents a boolean
1332	   action.  If set to TRUE, a participant is allowed to instruct the
1333	   focus to remove a user from the conference without modifying the
1334	   ruleset (in SIP terms, a participant is allowed to send a REFER
1335	   request [RFC3515] to the focus which results in the focus sending an
1336	   BYE request to the user the referrer wishes to leave the conference).
1337	   If set to FALSE, the refer request is rejected.  If this element is
1338	   undefined it has a value of FALSE, causing the refer to be rejected.

1340	4.6.5.10.  <endpoint>

1342	   The <endpoint> child element is identical to the element with the
1343	   same name in [RFC4575] except that the 'state' attribute is not
1344	   included.  The 'state' attribute only applies to notification
1345	   mechanisms.  The <endpoint> element can provide the desired level of
1346	   detail about the user's devices and their signaling sessions taking
1347	   part in the conference.

1349	   The <endpoint> element has the following child elements: <display-
1350	   text>, <referred>, <status>, <joining-method>, <joining-info>,
1351	   <disconnection-method>, <disconnection-info>, <media>,and <call-
1352	   info>.  All the <endpoint> child elements are defined in [RFC4575]
1353	   with the exception of the <to-mixer> element, and the <from-mixer>
1354	   element.

1356	   The <endpoint>/<media> element has two other child elements defined
1357	   in this document, the <to-mixer>, and the <from-mixer>:

1359	   o  <from-mixer>, <to-mixer>: These are controls that apply to a
1360	      user's media stream being sent from the mixer to the participants
1361	      endpoint or to the mixer from the participants endpoint.  The <to-
1362	      mixer> element details properties associated with the incoming
1363	      streams to the mixer (streams sent to the mixer from the
1364	      participant).  The <from-mixer> element details properties
1365	      associated with the outgoing streams from the mixer (sent from the
1366	      mixer to the participant).  Both of these elements have the
1367	      attribute 'name'.  The 'name' attribute has the values "VideoIn",
1368	      "VideoOut", "AudioOut", and "AudioIn".  The "VideoOut" and
1369	      "AudioOut" media streams detail properties associated with the
1370	      outgoing video and audio from the mixer.  The "VideoIn" and
1371	      "AudioIn" media stream details properties associated with the
1372	      incoming video and audio to the mixer.  Both of these elements can
1373	      have the <floor> child element defined:

1375	      *  The <floor> element refers to the floor assigned to a certain
1376	         participant in the conference.  If a participant, for instance,
1377	         needs to talk in the conference, it first needs to get the
1378	         floor from the chair of the conference.  The <floor> element
1379	         has an attribute 'id' which uniquely identifies a floor within
1380	         a conference.  The 'id' attribute corresponds to the floor-id
1381	         identifier defined in [RFC4582] section 5.2.2.  The <floor>
1382	         element has a "Boolean" value.  A value of FALSE indicates that
1383	         this user does not hold the floor in this moment.  If this
1384	         control is not specified, this user SHOULD NOT specify the
1385	         floor option.

1387	      The <to-mixer> and <from-mixer> elements can have the <controls>
1388	      child element:

1390	      *  Controls that apply to a specific user would appear under the
1391	         <controls> element.

1393	   o  More values can be defined in the future.

1395	4.7.  <sidebars-by-ref>

1397	   The <sidebars-by-ref> element contains a set of <entry> child
1398	   elements.  This element is described in [RFC4575], 5.9.1.  Note that
1399	   the <sidebars-by-ref> element does not have the attribute 'state'
1400	   defined in [RFC4575] for this element because this attribute only
1401	   applies to notifications mechanism.

1403	4.8.  <sidebars-by-val>

1405	   The <sidebars-by-val> element contains a set of <entry> child
1406	   elements each containing information about a single sidebar.  This
1407	   element is described in [RFC4575], 5.9.2.  Note that the <sidebars-
1408	   by-val> element does not have the attribute 'state' defined in
1409	   [RFC4575] for this element because this attribute only applies to
1410	   notifications mechanism.

1412	5.  RELAX NG Schema

1414	   In accordance with the Centralized Conferencing Framework document
1415	   [RFC5239], the Conference Object is a logical representation of a
1416	   conference instance.  The conference information schema contains core
1417	   information that is utilized in any conference.  It also contains the
1418	   variable information part of the Conference Object.

1420	   The normative schema is backwards compatible with [RFC5239], in other
1421	   words, valid [RFC5239] instance documents are also valid according to
1422	   this RELAX NG schema [RELAX].  In addition to approximately similar
1423	   RELAX NG [RELAX] definitions of [RFC5239], this schema contains
1424	   extension elements in the
1425	   "urn:ietf:params:xml:ns:xcon-conference-info" namespace.

1427	 default namespace = "urn:ietf:params:xml:ns:conference-info"
1428	 namespace xcon = "urn:ietf:params:xml:ns:xcon-conference-info"

1430	 start = element conference-info { conference-type }
1431	 # CONFERENCE TYPE
1432	 conference-type =
1433	   attribute entity { text }
1434	   & anyAttribute
1435	   & conference-description-type?
1436	   & element host-info { host-type }?
1437	   & element conference-state { conference-state-type }?
1438	   & element users { users-type }?
1439	   & element sidebars-by-ref { uris-type }?
1440	   & element sidebars-by-val { sidebars-by-val-type }?
1441	   & element xcon:floor-information { floor-information-type }?
1442	   & anyElement*
1443	 # CONFERENCE DESCRIPTION TYPE
1444	 conference-description-type =
1445	   element conference-description {
1446	     attribute xml:lang { xsd:language }?
1447	     & anyAttribute
1448	     & element display-text { text }?
1449	     & element subject { text }?
1450	     & element free-text { text }?
1451	     & element keywords {
1452	         list { xsd:string* }
1453	       }?
1454	     & element conf-uris { uris-type }?
1455	     & element service-uris { uris-type }?
1456	     & element maximum-user-count { xsd:int }?
1457	     & element available-media { conference-media-type }?
1458	     & element xcon:language { xsd:language }?
1459	     & element xcon:allow-sidebars { xsd:boolean }?
1460	     & element xcon:cloning-parent { xsd:anyURI }?
1461	     & element xcon:sidebar-parent { xsd:anyURI }?
1462	     & element xcon:conference-time { conferencetime-type }?
1463	     & anyElement*
1464	   }
1465	 # HOST TYPE
1466	 host-type =
1467	   element display-text { text }?
1468	   & element web-page { xsd:anyURI }?
1469	   & element uris { uris-type }?
1470	   & anyElement*
1471	   & anyAttribute
1472	 # CONFERENCE STATE TYPE
1473	 conference-state-type =
1474	   anyAttribute
1475	   & element user-count { xsd:unsignedInt }?
1476	   & element active { xsd:boolean }?
1477	   & element locked { xsd:boolean }?
1478	   & element xcon:allow-conference-event-subscription { xsd:boolean }?
1479	   & anyElement*
1480	 # CONFERENCE MEDIA TYPE
1481	 conference-media-type =
1482	   anyAttribute
1483	   & element entry { conference-medium-type }*
1484	   & anyElement*
1485	 # CONFERENCE MEDIUM TYPE
1486	 conference-medium-type =
1487	   attribute label { text }
1488	   & anyAttribute
1489	   & element display-text { text }?
1490	   & element type { text }?
1491	   & element status { media-status-type }?
1492	   & element xcon:mixing-mode { mixing-mode-type }?
1493	   & element xcon:codecs { codecs-type }?
1494	   & element xcon:controls { control-type }?
1495	   & anyElement*
1496	 # URIs TYPE
1497	 uris-type =
1498	   anyAttribute
1499	   & element entry { uri-type }*
1500	   & anyElement*
1501	 # URI TYPE
1502	 uri-type =
1503	   element uri { xsd:anyURI }
1504	   & element display-text { text }?
1505	   & element purpose { text }?
1506	   & element modified { execution-type }?
1507	   & element xcon:conference-password { text }*
1508	   & anyElement*
1509	   & anyAttribute
1510	 # USERS TYPE
1511	 users-type =
1512	   anyAttribute
1513	   & element user { user-type }*
1514	   & element xcon:join-handling { join-handling-type }?
1515	   & element xcon:user-admission-policy { user-admission-policy-type }?
1516	   & element xcon:allowed-users-list { allowed-users-list-type }?
1517	   & element xcon:deny-users-list { deny-user-list-type }?
1518	   & anyElement*
1519	 # USER TYPE
1520	 user-type =
1521	   attribute entity { xsd:anyURI }
1522	   & anyAttribute
1523	   & element display-text { text }?
1524	   & element associated-aors { uris-type }?
1525	   & element roles {
1526	       element entry { single-role-type }+
1527	     }?
1528	   & element languages {
1529	       list { xsd:language }
1530	     }?
1531	   & element cascaded-focus { xsd:anyURI }?
1532	   & element endpoint { endpoint-type }*
1533	   & element xcon:provide-anonymity { provide-anonymity-type }?
1534	   & element xcon:allow-refer-users-dynamically { xsd:boolean }?
1535	   & element xcon:allow-invite-users-dynamically { xsd:boolean }?
1536	   & element xcon:allow-remove-users-dynamically { xsd:boolean }?
1537	   & anyElement*
1538	 # ENDPOINT TYPE
1539	 endpoint-type =
1540	   attribute entity { text }
1541	   & anyAttribute
1542	   & element display-text { text }?
1543	   & element referred { execution-type }?
1544	   & element status { endpoint-status-type }?
1545	   & element joining-method { joining-type }?
1546	   & element joining-info { execution-type }?
1547	   & element disconnection-method { disconnection-type }?
1548	   & element disconnection-info { execution-type }?
1549	   & element media { media-type }*
1550	   & element call-info { call-type }?
1551	   & anyElement*
1552	 # ENDPOINT STATUS TYPE
1553	 endpoint-status-type =
1554	   "pending"
1555	   | "dialing-out"
1556	   | "dialing-in"
1557	   | "alerting"
1558	   | "on-hold"
1559	   | "connected"
1560	   | "muted-via-focus"
1561	   | "disconnecting"
1562	   | "disconnected"
1563	   | free-text-extension
1564	 # JOINING TYPE
1565	 joining-type =
1566	   "dialed-in" | "dialed-out" | "focus-owner" | free-text-extension
1567	 # DISCONNECTION TYPE
1568	 disconnection-type =
1569	   "departed" | "booted" | "failed" | "busy" | free-text-extension
1570	 # EXECUTION TYPE
1571	 execution-type =
1572	   element when { xsd:dateTime }?
1573	   & element reason { text }?
1574	   & element by { xsd:anyURI }?
1575	   & anyAttribute
1576	 # CALL TYPE
1577	 call-type =
1578	   element sip { sip-dialog-id-type }
1579	   & anyElement*
1580	   & anyAttribute
1581	 # SIP DIALOG ID TYPE
1582	 sip-dialog-id-type =
1583	   element display-text { text }?
1584	   & element call-id { text }
1585	   & element from-tag { text }
1586	   & element to-tag { text }
1587	   & anyElement*
1588	   & anyAttribute
1589	 # MEDIA TYPE
1590	 media-type =
1591	   attribute id { xsd:int }
1592	   & anyAttribute
1593	   & element display-text { text }?
1594	   & element type { text }?
1595	   & element label { text }?
1596	   & element src-id { text }?
1597	   & element status { media-status-type }?
1598	   & element xcon:to-mixer { mixer-type }?
1599	   & element xcon:from-mixer { mixer-type }?
1600	   & anyElement*
1601	 # MEDIA STATUS TYPE
1602	 media-status-type =
1603	   "recvonly"
1604	   | "sendonly"
1605	   | "sendrecv"
1606	   | "inactive"
1607	   | free-text-extension
1608	 # SIDEBARS-BY-VAL TYPE
1609	 sidebars-by-val-type =
1610	   anyAttribute
1611	   & element entry { conference-type }*
1612	   & anyElement*
1613	 # CONFERENCE TIME
1614	 conferencetime-type =
1615	   anyAttribute
1616	   & element xcon:entry {
1617	       element xcon:base { text },
1618	       element xcon:mixing-start-offset {
1619	         time-type,
1620	         attribute required-participant { single-role-type },
1621	         anyAttribute
1622	       }?,
1623	       element xcon:mixing-end-offset {
1624	         time-type,
1625	         attribute required-participant { single-role-type },
1626	         anyAttribute
1627	       }?,
1628	       element xcon:can-join-after-offset { time-type }?,
1629	       element xcon:must-join-before-offset { time-type }?,
1630	       element xcon:request-user { time-type }?,
1631	       element xcon:notify-end-of-conference { xsd:int }?,
1632	       element xcon:allowed-extend-mixing-end-offset { xsd:boolean }?,
1633	       anyElement*
1634	     }*
1635	 # TIME TYPE
1636	 time-type = xsd:dateTime { pattern = ".+T.+Z.*" }
1637	 # SINGLE ROLE TYPE
1638	 single-role-type =
1639	   xsd:string "none"
1640	   | xsd:string "administrator"
1641	   | xsd:string "moderator"
1642	   | xsd:string "user"
1643	   | xsd:string "observer"
1644	   | xsd:string "participant"
1645	   | free-text-extension
1646	 # MIXING MODE TYPE
1647	 mixing-mode-type =
1648	   xsd:string "moderator-controlled"
1649	   | xsd:string "FCFS"
1650	   | xsd:string "automatic"
1651	   | free-text-extension
1652	 # CODECS TYPE
1653	 codecs-type =
1654	   attribute decision { decision-type }
1655	   & anyAttribute
1656	   & element xcon:codec { codec-type }*
1657	   & anyElement*
1658	 # CODEC TYPE
1659	 codec-type =
1660	   attribute name { text }
1661	   & attribute policy { policy-type }
1662	   & anyAttribute
1663	   & element xcon:subtype { text }?
1664	   & anyElement*
1665	 # DECISION TYPE
1666	 decision-type =
1667	   xsd:string "automatic"
1668	   | xsd:string "moderator-controlled"
1669	   | free-text-extension
1670	 # POLICY TYPE
1671	 policy-type =
1672	   xsd:string "allowed" | xsd:string "disallowed" | free-text-extension
1673	 # CONTROL TYPE
1674	 control-type =
1675	   anyAttribute
1676	   & element xcon:mute { xsd:boolean }?
1677	   & element xcon:pause-video { xsd:boolean }?
1678	   & element xcon:gain { gain-type }?
1679	   & element xcon:video-layout { video-layout-type }?
1680	   & anyElement*
1681	 # GAIN TYPE
1682	 gain-type = xsd:int { minInclusive = "-127" maxInclusive = "127" }
1683	 # VIDEO LAYOUT TYPE
1684	 video-layout-type =
1685	   xsd:string "single-view"
1686	   | xsd:string "dual-view"
1687	   | xsd:string "dual-view-crop"
1688	   | xsd:string "dual-view-2x1"
1689	   | xsd:string "dual-view-2x1-crop"
1690	   | xsd:string "quad-view"
1691	   | xsd:string "multiple-3x3"
1692	   | xsd:string "multiple-4x4"
1693	   | xsd:string "multiple-5x1"
1694	   | xsd:string "automatic"
1695	   | free-text-extension
1696	 # FLOOR INFORMATION TYPE
1697	 floor-information-type =
1698	   anyAttribute
1699	   & element xcon:conference-ID { xsd:unsignedLong }?
1700	   & element xcon:allow-floor-events { xsd:boolean }?
1701	   & element xcon:floor-request-handling { floor-request-type }?
1702	   & element xcon:conference-floor-policy { conference-floor-policy }?
1703	   & anyElement*
1704	 # FLOOR REQUEST TYPE
1705	 floor-request-type =
1706	   xsd:string "block" | xsd:string "confirm" | free-text-extension
1707	 # CONFERENCE FLOOR POLICY
1708	 conference-floor-policy =
1709	   anyAttribute
1710	   & element xcon:floor {
1711	       attribute id { text }
1712	       & anyAttribute
1713	       & element xcon:media-label { xsd:nonNegativeInteger }+
1714	       & element xcon:algorithm { algorithm-type }?
1715	       & element xcon:max-floor-users { xsd:nonNegativeInteger }?
1716	       & element xcon:moderator-id { xsd:nonNegativeInteger }?
1717	       & anyElement*
1718	     }+
1719	 # ALGORITHM POLICY
1720	 algorithm-type =
1721	   xsd:string "moderator-controlled"
1722	   | xsd:string "FCFS"
1723	   | xsd:string "random"
1724	   | free-text-extension
1725	 # USERS ADMISSION POLICY
1726	 user-admission-policy-type =
1727	   xsd:string "closedAuthenticated"
1728	   | xsd:string "openAuthenticated"
1729	   | xsd:string "anonymous"
1730	   | free-text-extension
1731	 # JOIN HANDLING TYPE
1732	 join-handling-type =
1733	   xsd:string "block"
1734	   | xsd:string "confirm"
1735	   | xsd:string "allow"
1736	   | xsd:string "authenticate"
1737	   | xsd:string "directed-operator"
1738	   | free-text-extension
1739	 # DENY USERLIST
1740	 deny-user-list-type =
1741	   anyAttribute
1742	   & element xcon:target {
1743	       attribute uri { xsd:anyURI },
1744	       anyAttribute
1745	     }*
1746	   & anyElement*
1747	 # ALLOWED USERS LIST TYPE
1748	 allowed-users-list-type =
1749	   anyAttribute
1750	   & element xcon:target { target-type }*
1751	   & element xcon:persistent-list { persistent-list-type }?
1752	   & anyElement*
1753	 # PERSISTENT LIST TYPE
1754	 persistent-list-type =
1755	   element xcon:user {
1756	     attribute name { text }
1757	     & attribute nickname { text }
1758	     & attribute id { text }
1759	     & anyAttribute
1760	     & element xcon:e-mail { text }*
1761	     & anyElement*
1762	   }*
1763	   & anyElement*
1764	 # TARGET TYPE
1765	 target-type =
1766	   attribute uri { xsd:anyURI },
1767	   attribute method { method-type },
1768	   anyAttribute
1769	 # METHOD TYPE
1770	 method-type =
1771	   xsd:string "dial-in"
1772	   | xsd:string "dial-out"
1773	   | xsd:string "refer"
1774	   | free-text-extension
1775	 # ANONYMITY TYPE
1776	 provide-anonymity-type =
1777	   "private" | "semi-private" | "hidden" | free-text-extension
1778	 # MIXER TYPE
1779	 mixer-type =
1780	   attribute name { mixer-name-type }
1781	   & anyAttribute
1782	   & element xcon:controls { control-type }*
1783	   & element xcon:floor {
1784	       attribute id { text },
1785	       anyAttribute,
1786	       xsd:boolean
1787	     }*
1788	   & anyElement*
1789	 # MIXER NAME TYPE
1790	 mixer-name-type =
1791	   "VideoIn" | "VideoOut" | "AudioOut" | "AudioIn" | free-text-extension

1793	 # FREE TEXT EXTENSION
1794	 #

1796	 free-text-extension = text

1798	 # *********************************
1799	 # EXTENSIBILITY OF THE SCHEMA
1800	 # *********************************

1802	 # EXTENSIBILITY ELEMENTS
1803	 #

1805	 anyElement =
1806	   element * - (conference-description
1807	                | host-info
1808	                | conference-state
1809	                | users
1810	                | sidebars-by-ref
1811	                | sidebars-by-val
1812	                | display-text
1813	                | subject
1814	                | free-text
1815	                | keywords
1816	                | conf-uris
1817	                | service-uris
1818	                | maximum-user-count
1819	                | available-media
1820	                | web-page
1821	                | uris
1822	                | uri
1823	                | user-count
1824	                | active
1825	                | locked
1826	                | entry
1827	                | type
1828	                | status
1829	                | purpose
1830	                | modified
1831	                | user
1832	                | associated-aors
1833	                | roles
1834	                | languages
1835	                | cascaded-focus
1836	                | endpoint
1837	                | referred
1838	                | joining-method
1839	                | joining-info
1840	                | disconnection-method
1841	                | disconnection-info
1842	                | media
1843	                | call-info
1844	                | when
1845	                | reason
1846	                | by
1847	                | sip
1848	                | call-id
1849	                | from-tag
1850	                | to-tag
1851	                | label
1852	                | src-id
1853	                | xcon:conference-password
1854	                | xcon:mixing-mode
1855	                | xcon:codecs
1856	                | xcon:controls
1857	                | xcon:language
1858	                | xcon:allow-sidebars
1859	                | xcon:cloning-parent
1860	                | xcon:sidebar-parent
1861	                | xcon:allow-conference-event-subscription
1862	                | xcon:to-mixer
1863	                | xcon:provide-anonymity
1864	                | xcon:allow-refer-users-dynamically
1865	                | xcon:allow-invite-users-dynamically
1866	                | xcon:allow-remove-users-dynamically
1867	                | xcon:from-mixer
1868	                | xcon:join-handling
1869	                | xcon:user-admission-policy
1870	                | xcon:allowed-users-list
1871	                | xcon:deny-users-list
1872	                | xcon:floor-information
1873	                | xcon:conference-time
1874	                | xcon:provide-anonymity
1875	                | xcon:floor
1876	                | xcon:entry
1877	                | xcon:mixing-start-offset
1878	                | xcon:mixing-end-offset
1879	                | xcon:can-join-after-offset
1880	                | xcon:must-join-before-offset
1881	                | xcon:request-user
1882	                | xcon:notify-end-of-conference
1883	                | xcon:allowed-extend-mixing-end-offset
1884	                | xcon:codec
1885	                | xcon:subtype
1886	                | xcon:mute
1887	                | xcon:pause-video
1888	                | xcon:gain
1889	                | xcon:video-layout
1890	                | xcon:conference-ID
1891	                | xcon:allow-floor-events
1892	                | xcon:floor-request-handling
1893	                | xcon:conference-floor-policy
1894	                | xcon:media-label
1895	                | xcon:algorithm
1896	                | xcon:max-floor-users
1897	                | xcon:moderator-id
1898	                | xcon:target
1899	                | xcon:persistent-list
1900	                | xcon:e-mail
1901	                | xcon:user) { anyExtension }
1902	 anyExtension =
1903	   (attribute * { text }
1904	    | any)*
1905	 any =
1906	   element * {
1907	     (attribute * { text }
1908	      | text
1909	      | any)*
1910	   }

1912	 # EXTENSIBILITY ATTRIBUTES
1913	 #

1915	 anyAttribute =
1916	   attribute * - (xml:lang
1917	                  | entity
1918	                  | required-participant
1919	                  | label
1920	                  | decision
1921	                  | name
1922	                  | policy
1923	                  | uri
1924	                  | method
1925	                  | id
1926	                  | nickname) { text }*

1928	6.  XML Schema Extensibility

1930	   The Conference Information Data Model defined in this document is
1931	   meant to be extensible toward specific application domains.  Such
1932	   extensions are accomplished by defining elements, child elements and
1933	   attributes that are specific to the desired application domain.  The
1934	   IETF MAY extend the data model schema with unqualified attributes or
1935	   extension elements from the "urn:ietf:params:xml:ns:" "sub-namespace"
1936	   in the future.  Other instances are free to define extension elements
1937	   or attributes under other namespaces.

1939	   Elements or attributes from unknown namespaces MUST be ignored.

1941	7.  XML Example

1943	   The following is an example of a conference information document.
1944	   The conference starts on October 17, 2007, at 10:30 AM in New York
1945	   City and finishes the same day at 12:30 PM every week.  In this
1946	   example, there are currently 3 participants in a conference, one
1947	   administrator, one moderator, and one participant.  Sidebars are
1948	   allowed in this conference and ,consequently, there is one sidebar in
1949	   the conference.  In addition, Alice and Carol are using a floor in
1950	   the main conference to manage the audio and video resources.  At the
1951	   moment, Alice is assigned to use the floor.

1953	<?xml version="1.0" encoding="UTF-8"?>
1954	<conference-info
1955	        xmlns="urn:ietf:params:xml:ns:conference-info"
1956	        xmlns:xcon="urn:ietf:params:xml:ns:xcon-conference-info"
1957	        entity="conference123@example.com">
1958	        <!--
1959	            CONFERENCE DESCRIPTION
1960	        -->
1961	        <conference-description xml:lang="en-us">
1962	            <display-text>Discussion of Formula-1 racing</display-text>
1963	            <subject>Sports:Formula-1</subject>
1964	            <free-text>This is a conference example</free-text>
1965	            <keywords>Formula-1 cars</keywords>
1966	            <!--

1968	                CONFERENCE UNIQUE IDENTIFIERS
1969	            -->
1970	            <conf-uris>
1971	                <entry>
1972	                    <uri>tel:+3585671234</uri>
1973	                    <display-text>Conference Bridge</display-text>
1974	                    <purpose>participation</purpose>
1975	                    <xcon:conference-password
1976	                     >5678</xcon:conference-password>
1977	                </entry>
1978	                <entry>
1979	                    <uri>http://www.example.com/live.ram</uri>
1980	                    <purpose>streaming</purpose>
1981	                </entry>
1982	            </conf-uris>
1983	            <!--
1984	                SERVICE URIS
1985	            -->
1986	            <service-uris>
1987	                <entry>
1988	                    <uri>mailto:bob@example.com</uri>
1989	                    <display-text>email</display-text>
1990	                </entry>
1991	            </service-uris>
1992	            <!--
1993	                MAXIMUM USER COUNT
1994	            -->
1995	            <maximum-user-count>50</maximum-user-count>
1996	            <!--
1997	                AVAILABLE MEDIA
1998	            -->
1999	            <available-media>
2000	                <entry label="10234">
2001	                    <display-text>main audio</display-text>
2002	                    <type>audio</type>
2003	                    <status>sendrecv</status>
2004	                    <xcon:mixing-mode>automatic</xcon:mixing-mode>
2005	                    <xcon:codecs decision="automatic">
2006	                        <xcon:codec name="122" policy="allowed">
2007	                           <xcon:subtype>PCMU</xcon:subtype>
2008	                        </xcon:codec>
2009	                    </xcon:codecs>
2010	                    <xcon:controls>
2011	                        <xcon:mute>true</xcon:mute>
2012	                        <xcon:gain>50</xcon:gain>
2013	                    </xcon:controls>
2014	                </entry>
2015	                <entry label="10235">
2016	                    <display-text>main video</display-text>
2017	                    <type>video</type>
2018	                    <status>sendrecv</status>
2019	                    <xcon:mixing-mode>automatic</xcon:mixing-mode>
2020	                    <xcon:codecs decision="automatic">
2021	                        <xcon:codec name="123" policy="allowed">
2022	                           <xcon:subtype>H.263</xcon:subtype>

2024	                        </xcon:codec>
2025	                    </xcon:codecs>
2026	                    <xcon:controls>
2027	                        <xcon:video-layout
2028	                          >single-view</xcon:video-layout>
2029	                    </xcon:controls>
2030	                </entry>
2031	            </available-media>

2033	            <xcon:language>En-us</xcon:language>

2035	            <xcon:allow-sidebars>true</xcon:allow-sidebars>
2036	            <!--
2037	                CONFERENCE TIME
2038	            -->

2040	            <xcon:conference-time>
2041	                <xcon:entry>
2042	                    <xcon:base>BEGIN:VCALENDAR
2043	  PRODID:-//LlamaSpinner Inc.//NONSGML CamelCall//EN
2044	  VERSION:2.0
2045	  BEGIN:VEVENT
2046	  DTSTAMP:20071003T140728Z
2047	  UID:20071003T140728Z-345FDA-carol@example.com
2048	  ORGANIZER:MAILTO:carol@example.com
2049	  DTSTART:20071017T143000Z
2050	  RRULE:FREQ=WEEKLY
2051	  DTEND:20071217T163000Z
2052	  END:VEVENT
2053	  END:VCALENDAR</xcon:base>
2054	                    <xcon:mixing-start-offset
2055	                        required-participant="moderator"
2056	                       >2007-10-17T14:29:00Z</xcon:mixing-start-offset>
2057	                    <xcon:mixing-end-offset
2058	                        required-participant="participant"
2059	                       >2007-10-17T16:31:00Z</xcon:mixing-end-offset>
2060	                    <xcon:must-join-before-offset
2061	                       >2007-10-17T15:30:00Z
2062	                       </xcon:must-join-before-offset>

2064	                </xcon:entry>
2065	            </xcon:conference-time>

2067	        </conference-description>
2068	        <!--
2069	            HOST INFO

2071	        -->
2072	        <host-info>
2073	            <display-text>Formula1</display-text>
2074	            <web-page>http://www.example.com/formula1/</web-page>
2075	            <uris>
2076	                <entry>
2077	                    <uri>sip:alice@example.com</uri>
2078	                </entry>
2079	                <entry>
2080	                    <uri>sip:carol@example.com</uri>
2081	                </entry>
2082	            </uris>
2083	        </host-info>
2084	        <!--
2085	            CONFERENCE STATE
2086	        -->
2087	        <conference-state>
2088	            <user-count>3</user-count>
2089	            <active>true</active>
2090	            <locked>false</locked>
2091	            <xcon:allow-conference-event-subscription
2092	              >true</xcon:allow-conference-event-subscription>

2094	       </conference-state>
2095	        <!--
2096	            USERS
2097	        -->
2098	        <users>
2099	            <!--
2100	                USER BOB
2101	            -->
2102	            <user entity="xcon-userid:bob534">
2103	                <display-text>Bob Hoskins</display-text>
2104	                <associated-aors>
2105	                    <entry>
2106	                        <uri>mailto:bob@example.com</uri>
2107	                        <display-text>email</display-text>
2108	                    </entry>
2109	                </associated-aors>
2110	                <roles>
2111	                    <entry>participant</entry>
2112	                </roles>
2113	                <languages>en-us</languages>

2115	                <!--
2116	                    ENDPOINTS
2117	                -->
2118	                <endpoint entity="sip:bob@example.com">
2119	                    <display-text>Bob's Laptop</display-text>
2120	                    <referred>
2121	                        <when>2007-10-17T14:00:00Z</when>
2122	                        <reason>expert required</reason>
2123	                        <by>sip:alice@example.com</by>
2124	                    </referred>
2125	                    <status>connected</status>
2126	                    <joining-method>dialed-out</joining-method>
2127	                    <joining-info>
2128	                        <when>2007-10-17T14:00:00Z</when>
2129	                        <reason>invitation</reason>
2130	                        <by>sip:alice@example.com</by>
2131	                    </joining-info>
2132	                    <!--
2133	                        MEDIA
2134	                    -->
2135	                    <media id="1">
2136	                        <type>video</type>
2137	                        <label>10235</label>
2138	                        <src-id>432424</src-id>
2139	                        <status>sendrecv</status>
2140	                        <xcon:to-mixer name="VideoIn">
2141	                            <xcon:controls>
2142	                                <xcon:video-layout
2143	                                   >single-view</xcon:video-layout>
2144	                            </xcon:controls>
2145	                        </xcon:to-mixer>
2146	                    </media>
2147	                    <!--
2148	                        CALL INFO
2149	                    -->
2150	                    <call-info>
2151	                        <sip>
2152	                            <display-text>full info</display-text>
2153	                            <call-id>hsjh8980vhsb78</call-id>
2154	                            <from-tag>vav738dvbs</from-tag>
2155	                            <to-tag>8954jgjg8432</to-tag>
2156	                        </sip>
2157	                    </call-info>
2158	                </endpoint>
2159	                <xcon:provide-anonymity
2160	                 >semi-private</xcon:provide-anonymity>
2161	                 <xcon:allow-refer-users-dynamically
2162	                    >false</xcon:allow-refer-users-dynamically>
2163	                <xcon:allow-invite-users-dynamically
2164	                    >false</xcon:allow-invite-users-dynamically>
2165	                <xcon:allow-remove-users-dynamically
2166	                    >false</xcon:allow-remove-users-dynamically>

2168	            </user>

2170	            <!--
2171	                USER ALICE
2172	            -->
2173	            <user entity="xcon-userid:alice334">
2174	                <display-text>Alice Kay</display-text>
2175	                <associated-aors>
2176	                    <entry>
2177	                        <uri>mailto:alice@example.com</uri>
2178	                        <display-text>email</display-text>
2179	                    </entry>
2180	                </associated-aors>
2181	                <roles>
2182	                    <entry>moderator</entry>
2183	                </roles>
2184	                <languages>en-us</languages>
2185	                <!--
2186	                    ENDPOINTS
2187	                -->
2188	                <endpoint entity="sip:alice@example.com">
2189	                    <display-text>Alice's Desktop</display-text>
2190	                    <status>connected</status>
2191	                    <joining-method>dialed-in</joining-method>
2192	                    <joining-info>
2193	                        <when>2007-10-17T13:35:08Z</when>
2194	                        <reason>invitation</reason>
2195	                        <by>sip:conference@example.com</by>
2196	                    </joining-info>
2197	                    <!--
2198	                        MEDIA
2199	                    -->
2200	                    <media id="1">
2201	                        <type>video</type>
2202	                        <label>10235</label>
2203	                        <src-id>432424</src-id>
2204	                        <status>sendrecv</status>
2205	                        <xcon:to-mixer name="VideoIn">
2206	                         <xcon:controls>
2207	                            <xcon:video-layout
2208	                              >single-view</xcon:video-layout>
2209	                         </xcon:controls>
2210	                        </xcon:to-mixer>
2211	                    </media>
2212	                    <media id="2">
2213	                        <type>audio</type>
2214	                        <label>10234</label>
2215	                        <src-id>532535</src-id>
2216	                        <status>sendrecv</status>
2217	                        <xcon:to-mixer name="AudioIn">
2218	                          <xcon:controls>
2219	                            <xcon:gain>50</xcon:gain>
2220	                          </xcon:controls>
2221	                        </xcon:to-mixer>
2222	                        <xcon:from-mixer name="AudioOut">
2223	                          <xcon:controls>
2224	                              <xcon:gain>50</xcon:gain>
2225	                          </xcon:controls>
2226	                        </xcon:from-mixer>
2227	                    </media>
2228	                    <!--
2229	                        CALL INFO
2230	                    -->
2231	                    <call-info>
2232	                        <sip>
2233	                            <display-text>full info</display-text>
2234	                            <call-id>truy45469123478</call-id>
2235	                            <from-tag>asd456cbgt</from-tag>
2236	                            <to-tag>3456jgjg1234</to-tag>
2237	                        </sip>
2238	                    </call-info>
2239	                    <xcon:floor id="345">true</xcon:floor>
2240	                </endpoint>
2241	                <xcon:provide-anonymity>private</xcon:provide-anonymity>
2242	                <xcon:allow-refer-users-dynamically
2243	                    >true</xcon:allow-refer-users-dynamically>
2244	                <xcon:allow-invite-users-dynamically
2245	                    >true</xcon:allow-invite-users-dynamically>
2246	                <xcon:allow-remove-users-dynamically
2247	                    >true</xcon:allow-remove-users-dynamically>
2248	            </user>

2250	            <!--
2251	                USER CAROL
2252	            -->
2253	            <user entity="xcon-userid:carol233">
2254	                <display-text>Carol More</display-text>
2255	                <associated-aors>
2256	                    <entry>
2257	                        <uri>mailto:carol@example.com</uri>
2258	                        <display-text>email</display-text>
2259	                    </entry>
2260	                </associated-aors>
2261	                <roles>
2262	                    <entry>administrator</entry>
2263	                </roles>
2264	                <languages>en-us</languages>
2265	                <!--
2266	                    ENDPOINTS
2267	                -->
2268	                <endpoint entity="sip:carol@example.com">
2269	                    <display-text>Carol's Computer</display-text>
2270	                    <status>connected</status>
2271	                    <joining-method>dialed-in</joining-method>
2272	                    <joining-info>
2273	                        <when>2007-10-17T13:30:05Z</when>
2274	                        <reason>invitation</reason>
2275	                        <by>sip:conference@example.com</by>
2276	                    </joining-info>
2277	                    <!--
2278	                        MEDIA
2279	                    -->
2280	                    <media id="1">
2281	                        <type>video</type>
2282	                        <label>10235</label>
2283	                        <src-id>432424</src-id>
2284	                        <status>sendrecv</status>
2285	                        <xcon:to-mixer name="VideoIn">
2286	                            <xcon:controls>
2287	                                <xcon:video-layout
2288	                              >single-view</xcon:video-layout>
2289	                         </xcon:controls>
2290	                        </xcon:to-mixer>
2291	                    </media>
2292	                    <media id="2">
2293	                        <type>audio</type>
2294	                        <label>10234</label>
2295	                        <src-id>532535</src-id>
2296	                        <status>sendrecv</status>
2297	                        <xcon:to-mixer name="AudioIn">
2298	                            <xcon:controls>
2299	                                <xcon:gain>50</xcon:gain>
2300	                            </xcon:controls>
2301	                        </xcon:to-mixer>
2302	                        <xcon:from-mixer name="AudioOut">
2303	                            <xcon:controls>
2304	                                <xcon:gain>50</xcon:gain>
2305	                          </xcon:controls>
2306	                        </xcon:from-mixer>
2307	                    </media>
2308	                    <!--
2309	                        CALL INFO
2310	                    -->
2311	                    <call-info>
2312	                        <sip>
2313	                            <display-text>full info</display-text>
2314	                            <call-id>wevb12562321894</call-id>
2315	                            <from-tag>asw456wedf</from-tag>
2316	                            <to-tag>2365dfrt3497</to-tag>

2318	                        </sip>
2319	                    </call-info>

2321	                    <xcon:floor id="345">false</xcon:floor>
2322	                </endpoint>

2324	                <xcon:provide-anonymity>private</xcon:provide-anonymity>
2325	                <xcon:allow-refer-users-dynamically
2326	                    >true</xcon:allow-refer-users-dynamically>
2327	                <xcon:allow-invite-users-dynamically
2328	                    >true</xcon:allow-invite-users-dynamically>
2329	                <xcon:allow-remove-users-dynamically
2330	                    >true</xcon:allow-remove-users-dynamically>

2332	            </user>

2334	            <xcon:join-handling>allow</xcon:join-handling>
2335	            <xcon:user-admission-policy
2336	               >openAuthenticated</xcon:user-admission-policy>
2337	            <!--
2338	                ALLOWED USERS LIST
2339	            -->
2340	            <xcon:allowed-users-list>
2341	                <xcon:target uri="sip:bob@example.com"
2342	                    method="dial-out"/>
2343	                <xcon:target uri="sip:alice@example.com"
2344	                    method="dial-out"/>
2345	                <xcon:target uri="sip:carol@example.com"
2346	                    method="dial-out"/>
2347	                <xcon:target uri="sip:john@example.com"
2348	                    method="refer"/>
2349	            </xcon:allowed-users-list>
2350	            <!--
2351	                DENY USERS LIST
2352	            -->
2353	            <xcon:deny-users-list>
2354	                <xcon:target uri="sip:charlie@example.com"/>
2355	            </xcon:deny-users-list>
2356	        </users>
2357	        <!--
2358	            SIDEBARS BY REFERENCE
2359	        -->
2360	        <sidebars-by-ref>
2361	            <entry>
2362	                <uri>xcon:conf223</uri>
2363	                <display-text>private with Bob</display-text>
2364	            </entry>
2365	        </sidebars-by-ref>
2366	        <!--
2367	            SIDEBARS BY VALUE
2368	        -->
2369	        <sidebars-by-val>
2370	            <entry entity="conf223">
2371	                <users>
2372	                    <user entity="xcon-userid:bob534"/>
2373	                    <user entity="xcon-userid:carol233"/>
2374	                </users>
2375	            </entry>
2376	        </sidebars-by-val>
2377	        <!--
2378	            FLOOR INFORMATION
2379	        -->
2380	        <xcon:floor-information>
2381	            <xcon:conference-ID>567</xcon:conference-ID>
2382	            <xcon:allow-floor-events>true</xcon:allow-floor-events>
2383	            <xcon:floor-request-handling
2384	             >confirm</xcon:floor-request-handling>

2386	            <xcon:conference-floor-policy>
2387	                <xcon:floor id="345">
2388	                    <xcon:media-label>10234</xcon:media-label>
2389	                    <xcon:media-label>10235</xcon:media-label>
2390	                    <xcon:algorithm
2391	                     >moderator-controlled</xcon:algorithm>
2392	                    <xcon:max-floor-users>1</xcon:max-floor-users>
2393	                    <xcon:moderator-id>234</xcon:moderator-id>
2394	                </xcon:floor>
2395	            </xcon:conference-floor-policy>
2396	        </xcon:floor-information>

2398	    </conference-info>

2400	   Note that due to RFC formatting conventions, this documents splits
2401	   lines whose content would exceed 72 characters.

2403	8.  Security Considerations

2405	   There are numerous security considerations for this document.  This
2406	   section discusses them.  Overall, the security considerations for
2407	   authentication (Section 11) and the Security and Privacy of Identity
2408	   (Section 11.2) described in the centralized conferencing framework
2409	   [RFC5239] applies to this document.

2411	   This specification defines a data model for conference objects.
2412	   Different conferencing systems may use different protocols to provide
2413	   access to these conference objects.  This section contains general
2414	   security considerations for the conference objects and for the
2415	   protocols.  The specification of each particular protocol needs to
2416	   discuss how the specific protocol meets the security requirements
2417	   provided in this section.

2419	   A given conferencing system usually supports different protocols in
2420	   order to implement different functions (e.g., SIP for session control
2421	   and BFCP for floor control).  Each of these protocols may use their
2422	   own authentication mechanism.  In cases where a user is authenticated
2423	   using multiple authentication mechanisms, it is up to the
2424	   conferencing system to map all the different authentications to the
2425	   same user.  Discussing the specifics of different authentication
2426	   mechanism is beyond the scope of this document.

2428	   Furthermore, users may use different identifiers to access to a
2429	   conference as explained in Section 4.6.5.  These different namespaces
2430	   can be associated with a unique conference user identifier (XCON-
2431	   USERID).  A mapping database is used to map all these authenticated
2432	   user namespaces to the XCON-USERID.  There are several threats
2433	   against this database.  In order to minimize these threats, the
2434	   administrator of the conferencing system MUST ensure that only
2435	   authorized users can connect to this database (e.g., by using access
2436	   control rules).  In particular, the integrity of the database MUST be
2437	   protected against unauthorized modifications.  Generic security
2438	   considerations for usage of URIs are discussed in [RFC3986].  There
2439	   is no other encoding considerations for XCON-USERID or XCON-URI not
2440	   discussed in RFC 3986 [RFC3986].

2442	   The confidentiality of the database SHOULD be protected from
2443	   unauthorized users, given that the data model contains a set of
2444	   sensitive elements (e.g., passwords).  Therefore, in addition to
2445	   implementing access control, as discussed above, it is RECOMMENDED
2446	   that administrators of conferencing systems only provide access to
2447	   the database over encrypted channels (e.g., using TLS encryption) in
2448	   order to avoid eavesdroppers.  Administrators of conferencing systems
2449	   SHOULD also avoid disclosing information to unauthorized parties when
2450	   a conference is being cloned or when a sidebar is being created.  For
2451	   example, an external sidebar as defined in [RFC5239], section 9.4.2,
2452	   may include participants who were not authorized for the parent
2453	   conference.

2455	   The security considerations for authentication (Section 11.1)
2456	   described in the centralized conferencing framework [RFC5239] also
2457	   apply to this document.  Similarly, the security considerations for
2458	   authorization (Section 5.2) described in the Session Initiation
2459	   Protocol (SIP) REFER Method [RFC3515] apply to this document as well.

2461	9.  IANA Considerations

2463	9.1.  Relax NG Schema Registration

2465	  This specification registers a schema. The schema can be found
2466	  as the sole content of Section 5.

2468	     URI:  urn:ietf:params:xml:schema:xcon-conference-info

2470	     Registrant Contact: IETF XCON working group,
2471	        <xcon@ietf.org>, Oscar Novo
2472	        <Oscar.Novo@ericsson.com>

2474	     Relax NG Schema:  The Relax NG schema to be registered is contained
2475	        in Section 5.  Its first line is

2477	     default namespace = "urn:ietf:params:xml:ns:conference-info"

2479	        and its last line is

2481	     anyAttribute = attribute * - (xml:lang | entity
2482	                    | required-participant | label | decision | name
2483	                    | policy | uri | method | id | nickname) { text }*

2485	9.2.  XML Namespace Registration
2486	   This section registers a new XML namespace.

2488	      URI:  urn:ietf:params:xml:ns:xcon-conference-info

2490	      Registrant Contact: IETF XCON working group,
2491	         <xcon@ietf.org>, Oscar Novo
2492	         <Oscar.Novo@ericsson.com>

2494	       XML:

2496	         BEGIN
2497	         <?xml version="1.0"?>
2498	         <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
2499	           "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
2500	         <html xmlns="http://www.w3.org/1999/xhtml">
2501	         <head>
2502	           <meta http-equiv="content-type"
2503	                 content="text/html;charset=iso-8859-1"/>
2504	           <title> Centralized Conferencing Namespace</title>
2505	         </head>
2506	         <body>
2507	           <h1>Namespace for Centralized Conferencing</h1>
2508	           <h2>urn:ietf:params:xml:ns:xcon-conference-info</h2>
2509	         <p>See <a href="[URL of published RFC]">RFCXXXX
2510	             [NOTE TO IANA/RFC-EDITOR:
2511	              Please replace XXXX with the RFC number of this
2512	             specification.]</a>.</p>
2513	         </body>
2514	         </html>
2515	         END

2517	9.3.  Conference Object Identifier Registration

2519	   The IANA is requested to register the following URI scheme
2520	   under the Permanent URI Schemes registry.

2522	   XCON-URI = "xcon" ":" [conf-object-id "@"] host

2524	    conf-object-id = 1*( unreserved / "+" / "=" / "/" )

2526	   host and unreserved are defined in [RFC3986]
2527	    URI scheme name: xcon
2528	    Status: permanent
2529	    URI scheme syntax: see Section 3.3.1.
2530	    URI schema semantics: see Section 3.3
2531	    Encoding considerations: see Section 8
2532	    Intended usage: see Section 3.3
2533	    Applications and/or protocols that use this URI scheme name:
2534	           Centralized Conferencing systems
2535	    Interoperability considerations: none
2536	    Security considerations: see Section 8
2537	    Relevant publications: Conference Information Data Model for
2538	           Centralized Conferencing (XCON)
2539	    Contact:  Oscar Novo<oscar novo_at_ericsson.com>
2540	    Author/Change controller:  Oscar Novo<oscar novo_at_ericsson.com>

2542	9.4.  Conference User Identifier Registration

2544	   The IANA is requested to register the following URI scheme
2545	    under the Permanent URI Schemes registry.

2547	    XCON-USERID = "xcon-userid" ":" conf-user-id

2549	    conf-user-id = 1*unreserved

2551	   unreserved is defined in [RFC3986]

2553	    URI scheme name: xcon-userid
2554	    Status: permanent
2555	    URI scheme syntax: see Section 4.6.5
2556	    URI schema semantics: see Section 4.6.5
2557	    Encoding considerations: see Section 8
2558	    Intended usage: see Section 4.6.3 and 4.6.5
2559	    Applications and/or protocols that use this URI scheme name:
2560	           Centralized Conferencing systems.
2561	    Interoperability considerations: none
2562	    Security considerations: see Section 8
2563	    Relevant publications: Conference Information Data Model for
2564	           Centralized Conferencing (XCON)
2565	    Contact:  Oscar Novo<oscar novo_at_ericsson.com>
2566	    Author/Change controller:  Oscar Novo<oscar novo_at_ericsson.com>

2568	10.  Acknowledgements

2570	   This document is really a distillation of many ideas discussed over a
2571	   long period of time.  These ideas were contributed by many different
2572	   drafts in the XCON working group and the SIPPING working group.  We
2573	   would like to thank Orit Levin, Roni Even, Adam Roach, Mary Barnes,
2574	   Chris Boulton, Umesh Chandra, Hisham Khartabil, Petri Koskelainen,
2575	   Aki Niemi, Rohan Mahy, Jonathan Lennox, Sean Duddy, Richard Barnes,
2576	   and Henning Schulzrinne for their comments.  Also, we would like to
2577	   thank Mary Barnes, and Chris Boulton for letting us use the
2578	   conference and user identifier information of their xcon drafts.
2579	   Last but not least, we would like to express our gratitude to all
2580	   those reviewers for their invaluable contribution: Simon Pietro
2581	   Romano, Lorenzo Miniero, Tobia Castaldi, Miguel Garcia, Mary Barnes,
2582	   Srivatsa Srinivasan, Avshalom Houri, Pierre Tane, and Ben Campbell.

2584	11.  References

2586	11.1.  Normative References

2588	   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
2589	              Requirement Levels", BCP 14, RFC 2119, March 1997.

2591	   [RFC3986]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
2592	              Resource Identifier (URI): Generic Syntax", STD 66,
2593	              RFC 3986, January 2005.

2595	   [RFC4575]  Rosenberg, J., Schulzrinne, H., and O. Levin, "A Session
2596	              Initiation Protocol (SIP) Event Package for Conference
2597	              State", RFC 4575, August 2006.

2599	   [RFC4582]  Camarillo, G., Ott, J., and K. Drage, "The Binary Floor
2600	              Control Protocol (BFCP)", RFC 4582, November 2006.

2602	   [RFC4583]  Camarillo, G., "Session Description Protocol (SDP) Format
2603	              for Binary Floor Control Protocol (BFCP) Streams",
2604	              RFC 4583, November 2006.

2606	   [RFC5239]  Barnes, M., Boulton, C., and O. Levin, "A Framework for
2607	              Centralized Conferencing", RFC 5239, June 2008.

2609	   [RFC5545]  Desruisseaux, B., "Internet Calendaring and Scheduling
2610	              Core Object Specification (iCalendar)", RFC 5545,
2611	              September 2009.

2613	11.2.  Informative References

2615	   [IANA]     "IANA registry for RTP Payload Types"
2616	              "http://www.iana.org/assignments/rtp-parameters".

2618	   [IANA-Lan]
2619	              "IANA Language Subtag Registry"
2620	              "http://www.iana.org/assignments/
2621	              language-subtag-registry".

2623	   [RELAX]    "RELAX NG Home Page" "http://relaxng.org/".

2625	   [RFC3264]  Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model
2626	              with Session Description Protocol (SDP)", RFC 3264,
2627	              June 2002.

2629	   [RFC3265]  Roach, A., "Session Initiation Protocol (SIP)-Specific
2630	              Event Notification", RFC 3265, June 2002.

2632	   [RFC3515]  Sparks, R., "The Session Initiation Protocol (SIP) Refer
2633	              Method", RFC 3515, April 2003.

2635	   [RFC4353]  Rosenberg, J., "A Framework for Conferencing with the
2636	              Session Initiation Protocol (SIP)", RFC 4353,
2637	              February 2006.

2639	   [RFC4855]  Casner, S., "Media Type Registration of RTP Payload
2640	              Formats", RFC 4855, February 2007.

2642	   [RFC5018]  Camarillo, G., "Connection Establishment in the Binary
2643	              Floor Control Protocol (BFCP)", RFC 5018, September 2007.

2645	   [RFC5646]  Phillips, A. and M. Davis, "Tags for Identifying
2646	              Languages", BCP 47, RFC 5646, September 2009.

2648	   [W3C.REC-xml-20081126]
2649	              Yergeau, F., Sperberg-McQueen, C., Paoli, J., Maler, E.,
2650	              and T. Bray, "Extensible Markup Language (XML) 1.0 (Fifth
2651	              Edition)", World Wide Web Consortium Recommendation REC-
2652	              xml-20081126, November 2008,
2653	              <http://www.w3.org/TR/2008/REC-xml-20081126>.

2655	Appendix A.  Non-Normative RELAX NG Schema in XML Syntax

2657	 <?xml version="1.0" encoding="UTF-8" ?>
2658	    <grammar
2659	           ns="urn:ietf:params:xml:ns:conference-info"
2660	           xmlns="http://relaxng.org/ns/structure/1.0"
2661	           xmlns:xcon="urn:ietf:params:xml:ns:xcon-conference-info"
2662	           datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
2663	           <start>
2664	            <element name="conference-info">
2665	             <ref name="conference-type"/>
2666	            </element>
2667	           </start>
2668	           <!--
2669	               CONFERENCE TYPE
2670	           -->
2671	           <define name="conference-type">
2672	            <interleave>
2673	            <attribute name="entity">
2674	             <text/>
2675	            </attribute>
2676	            <ref name="anyAttribute"/>
2677	            <optional>
2678	             <ref name="conference-description-type"/>
2679	            </optional>
2680	            <optional>
2681	             <element name="host-info">
2682	              <ref name="host-type"/>
2683	             </element>
2684	            </optional>
2685	            <optional>
2686	             <element name="conference-state">
2687	              <ref name="conference-state-type"/>
2688	             </element>
2689	            </optional>
2690	            <optional>
2691	             <element name="users">
2692	              <ref name="users-type"/>
2693	             </element>
2694	            </optional>
2695	            <optional>
2696	             <element name="sidebars-by-ref">
2697	              <ref name="uris-type"/>
2698	             </element>
2699	            </optional>
2700	            <optional>
2701	             <element name="sidebars-by-val">
2702	              <ref name="sidebars-by-val-type"/>
2703	             </element>
2704	            </optional>
2705	            <optional>
2706	             <element name="xcon:floor-information">
2707	              <ref name="floor-information-type"/>

2709	             </element>
2710	            </optional>
2711	            <zeroOrMore>
2712	             <ref name="anyElement"/>
2713	            </zeroOrMore>
2714	            </interleave>
2715	           </define>
2716	           <!--
2717	               CONFERENCE DESCRIPTION TYPE
2718	           -->
2719	           <define name="conference-description-type">
2720	            <element name="conference-description">
2721	             <interleave>
2722	             <optional>
2723	              <attribute name="xml:lang">
2724	               <data type="language"/>
2725	              </attribute>
2726	             </optional>
2727	             <ref name="anyAttribute"/>
2728	             <optional>
2729	              <element name="display-text">
2730	               <text/>
2731	              </element>
2732	             </optional>
2733	             <optional>
2734	              <element name="subject">
2735	               <text/>
2736	              </element>
2737	             </optional>
2738	             <optional>
2739	              <element name="free-text">
2740	               <text/>
2741	              </element>
2742	             </optional>
2743	             <optional>
2744	              <element name="keywords">
2745	               <list>
2746	                <zeroOrMore>
2747	                 <data type="string"/>
2748	                </zeroOrMore>
2749	               </list>
2750	              </element>
2751	             </optional>
2752	             <optional>
2753	              <element name="conf-uris">
2754	               <ref name="uris-type"/>
2755	              </element>
2756	             </optional>
2757	             <optional>
2758	              <element name="service-uris">
2759	                 <ref name="uris-type"/>
2760	              </element>
2761	             </optional>
2762	             <optional>
2763	              <element name="maximum-user-count">
2764	               <data type="int"/>
2765	              </element>
2766	             </optional>
2767	             <optional>
2768	              <element name="available-media">
2769	               <ref name="conference-media-type"/>
2770	              </element>
2771	             </optional>
2772	             <optional>
2773	              <element name="xcon:language">
2774	               <data type="language"/>
2775	              </element>
2776	             </optional>
2777	             <optional>
2778	              <element name="xcon:allow-sidebars">
2779	               <data type="boolean"/>
2780	              </element>
2781	             </optional>
2782	             <optional>
2783	             <element name="xcon:cloning-parent">
2784	              <data type="anyURI"/>
2785	             </element>
2786	             </optional>
2787	             <optional>
2788	             <element name="xcon:sidebar-parent">
2789	              <data type="anyURI"/>
2790	             </element>
2791	             </optional>
2792	             <optional>
2793	              <element name="xcon:conference-time">
2794	               <ref name="conferencetime-type"/>
2795	              </element>
2796	             </optional>
2797	             <zeroOrMore>
2798	              <ref name="anyElement"/>
2799	             </zeroOrMore>
2800	             </interleave>
2801	            </element>
2802	           </define>
2803	           <!--
2804	               HOST TYPE

2806	           -->
2807	           <define name="host-type">
2808	            <interleave>
2809	            <optional>
2810	             <element name="display-text">
2811	              <text/>
2812	             </element>
2813	            </optional>
2814	            <optional>
2815	             <element name="web-page">
2816	              <data type="anyURI"/>
2817	             </element>
2818	            </optional>
2819	            <optional>
2820	             <element name="uris">
2821	              <ref name="uris-type"/>
2822	             </element>
2823	            </optional>
2824	            <zeroOrMore>
2825	             <ref name="anyElement"/>
2826	            </zeroOrMore>
2827	            <ref name="anyAttribute"/>
2828	            </interleave>
2829	           </define>
2830	           <!--
2831	               CONFERENCE STATE TYPE
2832	           -->
2833	           <define name="conference-state-type">
2834	            <interleave>
2835	            <ref name="anyAttribute"/>
2836	            <optional>
2837	             <element name="user-count">
2838	              <data type="unsignedInt"/>
2839	             </element>
2840	            </optional>
2841	            <optional>
2842	             <element name="active">
2843	              <data type="boolean"/>
2844	             </element>
2845	            </optional>
2846	            <optional>
2847	             <element name="locked">
2848	              <data type="boolean"/>
2849	             </element>
2850	            </optional>
2851	            <optional>
2852	             <element name="xcon:allow-conference-event-subscription">
2853	              <data type="boolean"/>

2855	             </element>
2856	            </optional>
2857	            <zeroOrMore>
2858	             <ref name="anyElement"/>
2859	            </zeroOrMore>
2860	            </interleave>
2861	           </define>
2862	           <!--
2863	               CONFERENCE MEDIA TYPE
2864	           -->
2865	           <define name="conference-media-type">
2866	            <interleave>
2867	            <ref name="anyAttribute"/>
2868	            <zeroOrMore>
2869	             <element name="entry">
2870	              <ref name="conference-medium-type"/>
2871	             </element>
2872	            </zeroOrMore>
2873	            <zeroOrMore>
2874	             <ref name="anyElement"/>
2875	            </zeroOrMore>
2876	            </interleave>
2877	           </define>
2878	           <!--
2879	               CONFERENCE MEDIUM TYPE
2880	           -->
2881	           <define name="conference-medium-type">
2882	            <interleave>
2883	            <attribute name="label">
2884	             <text/>
2885	            </attribute>
2886	            <ref name="anyAttribute"/>
2887	            <optional>
2888	             <element name="display-text">
2889	              <text/>
2890	             </element>
2891	            </optional>
2892	            <optional>
2893	             <element name="type">
2894	              <text/>
2895	             </element>
2896	            </optional>
2897	            <optional>
2898	             <element name="status">
2899	              <ref name="media-status-type"/>
2900	             </element>
2901	            </optional>
2902	            <optional>
2903	             <element name="xcon:mixing-mode">
2904	              <ref name="mixing-mode-type"/>
2905	             </element>
2906	            </optional>
2907	            <optional>
2908	             <element name="xcon:codecs">
2909	              <ref name="codecs-type"/>
2910	             </element>
2911	            </optional>
2912	            <optional>
2913	             <element name="xcon:controls">
2914	              <ref name="control-type"/>
2915	             </element>
2916	            </optional>
2917	            <zeroOrMore>
2918	             <ref name="anyElement"/>
2919	            </zeroOrMore>
2920	            </interleave>
2921	           </define>
2922	           <!--
2923	               URIs TYPE
2924	           -->
2925	           <define name="uris-type">
2926	            <interleave>
2927	            <ref name="anyAttribute"/>
2928	            <zeroOrMore>
2929	             <element name="entry">
2930	              <ref name="uri-type"/>
2931	             </element>
2932	            </zeroOrMore>
2933	            <zeroOrMore>
2934	             <ref name="anyElement"/>
2935	            </zeroOrMore>
2936	            </interleave>
2937	           </define>
2938	           <!--
2939	               URI TYPE
2940	           -->
2941	           <define name="uri-type">
2942	            <interleave>
2943	            <element name="uri">
2944	             <data type="anyURI"/>
2945	            </element>
2946	            <optional>
2947	             <element name="display-text">
2948	              <text/>
2949	             </element>
2950	            </optional>
2951	            <optional>
2952	             <element name="purpose">
2953	              <text/>
2954	             </element>
2955	            </optional>
2956	            <optional>
2957	             <element name="modified">
2958	              <ref name="execution-type"/>
2959	             </element>
2960	            </optional>
2961	            <zeroOrMore>
2962	             <element name="xcon:conference-password">
2963	              <text/>
2964	             </element>
2965	            </zeroOrMore>
2966	            <zeroOrMore>
2967	             <ref name="anyElement"/>
2968	            </zeroOrMore>
2969	            <ref name="anyAttribute"/>
2970	           </interleave>

2972	           </define>
2973	           <!--
2974	               USERS TYPE
2975	           -->
2976	           <define name="users-type">
2977	            <interleave>
2978	            <ref name="anyAttribute"/>
2979	            <zeroOrMore>
2980	             <element name="user">
2981	              <ref name="user-type"/>
2982	             </element>
2983	            </zeroOrMore>
2984	            <optional>
2985	             <element name="xcon:join-handling">
2986	              <ref name="join-handling-type"/>
2987	             </element>
2988	            </optional>
2989	            <optional>
2990	             <element name="xcon:user-admission-policy">
2991	              <ref name="user-admission-policy-type"/>
2992	             </element>
2993	            </optional>
2994	            <optional>
2995	             <element name="xcon:allowed-users-list">
2996	              <ref name="allowed-users-list-type"/>
2997	             </element>
2998	            </optional>
2999	            <optional>
3000	             <element name="xcon:deny-users-list">
3001	              <ref name="deny-user-list-type"/>
3002	             </element>
3003	            </optional>
3004	            <zeroOrMore>
3005	             <ref name="anyElement"/>
3006	            </zeroOrMore>
3007	            </interleave>
3008	           </define>
3009	           <!--
3010	               USER TYPE
3011	           -->
3012	           <define name="user-type">
3013	            <interleave>
3014	            <attribute name="entity">
3015	             <data type="anyURI"/>
3016	            </attribute>
3017	            <ref name="anyAttribute"/>
3018	            <optional>
3019	             <element name="display-text">
3020	              <text/>
3021	             </element>
3022	            </optional>
3023	            <optional>
3024	             <element name="associated-aors">
3025	               <ref name="uris-type"/>
3026	             </element>
3027	            </optional>
3028	            <optional>
3029	             <element name="roles">
3030	              <oneOrMore>
3031	               <element name="entry">
3032	                <ref name="single-role-type"/>
3033	               </element>
3034	              </oneOrMore>
3035	             </element>
3036	            </optional>
3037	            <optional>
3038	             <element name="languages">
3039	              <list>
3040	               <data type="language"/>
3041	              </list>
3042	             </element>
3043	            </optional>
3044	            <optional>
3045	             <element name="cascaded-focus">
3046	              <data type="anyURI"/>

3048	             </element>
3049	            </optional>
3050	            <zeroOrMore>
3051	             <element name="endpoint">
3052	              <ref name="endpoint-type"/>
3053	             </element>
3054	            </zeroOrMore>
3055	            <optional>
3056	             <element name="xcon:provide-anonymity">
3057	              <ref name="provide-anonymity-type"/>
3058	             </element>
3059	            </optional>
3060	           <optional>
3061	             <element name="xcon:allow-refer-users-dynamically">
3062	              <data type="boolean"/>
3063	             </element>
3064	            </optional>
3065	            <optional>
3066	             <element name="xcon:allow-invite-users-dynamically">
3067	              <data type="boolean"/>
3068	             </element>
3069	            </optional>
3070	            <optional>
3071	             <element name="xcon:allow-remove-users-dynamically">
3072	              <data type="boolean"/>
3073	             </element>
3074	            </optional>
3075	             <zeroOrMore>
3076	             <ref name="anyElement"/>
3077	            </zeroOrMore>
3078	            </interleave>
3079	           </define>
3080	           <!--
3081	               ENDPOINT TYPE
3082	           -->
3083	           <define name="endpoint-type">
3084	            <interleave>
3085	            <attribute name="entity">
3086	             <text/>
3087	            </attribute>
3088	            <ref name="anyAttribute"/>
3089	            <optional>
3090	             <element name="display-text">
3091	              <text/>
3092	             </element>
3093	            </optional>
3094	            <optional>
3095	             <element name="referred">
3096	               <ref name="execution-type"/>
3097	             </element>
3098	            </optional>
3099	            <optional>
3100	             <element name="status">
3101	              <ref name="endpoint-status-type"/>
3102	             </element>
3103	            </optional>
3104	            <optional>
3105	             <element name="joining-method">
3106	              <ref name="joining-type"/>
3107	             </element>
3108	            </optional>
3109	            <optional>
3110	             <element name="joining-info">
3111	               <ref name="execution-type"/>
3112	             </element>
3113	            </optional>
3114	            <optional>
3115	             <element name="disconnection-method">
3116	              <ref name="disconnection-type"/>
3117	             </element>
3118	            </optional>
3119	            <optional>
3120	             <element name="disconnection-info">
3121	              <ref name="execution-type"/>
3122	             </element>
3123	            </optional>
3124	            <zeroOrMore>
3125	             <element name="media">
3126	              <ref name="media-type"/>
3127	             </element>
3128	            </zeroOrMore>
3129	            <optional>
3130	             <element name="call-info">
3131	              <ref name="call-type"/>
3132	             </element>
3133	            </optional>
3134	            <zeroOrMore>
3135	             <ref name="anyElement"/>
3136	            </zeroOrMore>
3137	            </interleave>
3138	           </define>
3139	           <!--
3140	               ENDPOINT STATUS TYPE
3141	           -->
3142	           <define name="endpoint-status-type">
3143	            <choice>
3144	             <value>pending</value>
3145	             <value>dialing-out</value>
3146	             <value>dialing-in</value>
3147	             <value>alerting</value>
3148	             <value>on-hold</value>
3149	             <value>connected</value>
3150	             <value>muted-via-focus</value>
3151	             <value>disconnecting</value>
3152	             <value>disconnected</value>
3153	             <ref name="free-text-extension"/>
3154	            </choice>
3155	           </define>
3156	           <!--
3157	               JOINING TYPE
3158	           -->
3159	           <define name="joining-type">
3160	            <choice>
3161	             <value>dialed-in</value>
3162	             <value>dialed-out</value>
3163	             <value>focus-owner</value>
3164	             <ref name="free-text-extension"/>
3165	            </choice>
3166	           </define>
3167	           <!--
3168	               DISCONNECTION TYPE
3169	           -->
3170	           <define name="disconnection-type">
3171	            <choice>
3172	             <value>departed</value>
3173	             <value>booted</value>
3174	             <value>failed</value>
3175	             <value>busy</value>
3176	             <ref name="free-text-extension"/>
3177	            </choice>
3178	           </define>
3179	           <!--
3180	               EXECUTION TYPE
3181	           -->
3182	           <define name="execution-type">
3183	            <interleave>
3184	            <optional>
3185	             <element name="when">
3186	              <data type="dateTime"/>
3187	             </element>
3188	            </optional>
3189	            <optional>
3190	             <element name="reason">
3191	              <text/>

3193	             </element>
3194	            </optional>
3195	            <optional>
3196	             <element name="by">
3197	              <data type="anyURI"/>
3198	             </element>
3199	            </optional>
3200	            <ref name="anyAttribute"/>
3201	            </interleave>
3202	           </define>
3203	           <!--
3204	               CALL TYPE
3205	           -->
3206	           <define name="call-type">
3207	            <interleave>
3208	             <element name="sip">
3209	              <ref name="sip-dialog-id-type"/>
3210	             </element>
3211	             <zeroOrMore>
3212	              <ref name="anyElement"/>
3213	             </zeroOrMore>
3214	             <ref name="anyAttribute"/>
3215	            </interleave>
3216	           </define>
3217	           <!--
3218	               SIP DIALOG ID TYPE
3219	           -->
3220	           <define name="sip-dialog-id-type">
3221	            <interleave>
3222	            <optional>
3223	            <element name="display-text">
3224	             <text/>
3225	            </element>
3226	            </optional>
3227	            <element name="call-id">
3228	             <text/>
3229	            </element>
3230	            <element name="from-tag">
3231	             <text/>
3232	            </element>
3233	            <element name="to-tag">
3234	             <text/>
3235	            </element>
3236	            <zeroOrMore>
3237	             <ref name="anyElement"/>
3238	            </zeroOrMore>
3239	            <ref name="anyAttribute"/>
3240	            </interleave>

3242	           </define>
3243	           <!--
3244	               MEDIA TYPE
3245	           -->
3246	           <define name="media-type">
3247	            <interleave>
3248	            <attribute name="id">
3249	             <data type="int"/>
3250	            </attribute>
3251	            <ref name="anyAttribute"/>
3252	            <optional>
3253	             <element name="display-text">
3254	              <text/>
3255	             </element>
3256	            </optional>
3257	            <optional>
3258	             <element name="type">
3259	              <text/>
3260	             </element>
3261	            </optional>
3262	            <optional>
3263	             <element name="label">
3264	              <text/>
3265	             </element>
3266	            </optional>
3267	            <optional>
3268	             <element name="src-id">
3269	              <text/>
3270	             </element>
3271	            </optional>
3272	            <optional>
3273	             <element name="status">
3274	              <ref name="media-status-type"/>
3275	             </element>
3276	            </optional>
3277	            <optional>
3278	             <element name="xcon:to-mixer">
3279	              <ref name="mixer-type"/>
3280	             </element>
3281	            </optional>
3282	            <optional>
3283	             <element name="xcon:from-mixer">
3284	              <ref name="mixer-type"/>
3285	             </element>
3286	            </optional>
3287	            <zeroOrMore>
3288	             <ref name="anyElement"/>
3289	            </zeroOrMore>
3290	            </interleave>
3291	           </define>
3292	           <!--
3293	               MEDIA STATUS TYPE
3294	           -->
3295	           <define name="media-status-type">
3296	            <choice>
3297	             <value>recvonly</value>
3298	             <value>sendonly</value>
3299	             <value>sendrecv</value>
3300	             <value>inactive</value>
3301	             <ref name="free-text-extension"/>
3302	            </choice>
3303	           </define>
3304	           <!--
3305	               SIDEBARS-BY-VAL TYPE
3306	           -->
3307	           <define name="sidebars-by-val-type">
3308	            <interleave>
3309	            <ref name="anyAttribute"/>
3310	            <zeroOrMore>
3311	             <element name="entry">
3312	              <ref name="conference-type"/>
3313	             </element>
3314	            </zeroOrMore>
3315	            <zeroOrMore>
3316	             <ref name="anyElement"/>
3317	            </zeroOrMore>
3318	            </interleave>
3319	           </define>
3320	           <!--
3321	               CONFERENCE TIME
3322	           -->
3323	           <define name="conferencetime-type">
3324	            <interleave>
3325	            <ref name="anyAttribute"/>
3326	            <zeroOrMore>
3327	             <element name="xcon:entry">
3328	              <element name="xcon:base">
3329	               <text/>
3330	              </element>
3331	              <optional>
3332	               <element name="xcon:mixing-start-offset">
3333	                 <ref name="time-type"/>
3334	                 <attribute name="required-participant">
3335	                  <ref name="single-role-type"/>
3336	                 </attribute>
3337	                <ref name="anyAttribute"/>

3339	               </element>
3340	              </optional>
3341	              <optional>
3342	               <element name="xcon:mixing-end-offset">
3343	                <ref name="time-type"/>
3344	                <attribute name="required-participant">
3345	                 <ref name="single-role-type"/>
3346	                </attribute>
3347	                <ref name="anyAttribute"/>
3348	               </element>
3349	              </optional>
3350	              <optional>
3351	               <element name="xcon:can-join-after-offset">
3352	                <ref name="time-type"/>
3353	               </element>
3354	              </optional>
3355	              <optional>
3356	               <element name="xcon:must-join-before-offset">
3357	                <ref name="time-type"/>
3358	               </element>
3359	              </optional>
3360	              <optional>
3361	               <element name="xcon:request-user">
3362	                <ref name="time-type"/>
3363	               </element>
3364	              </optional>
3365	              <optional>
3366	               <element name="xcon:notify-end-of-conference">
3367	                <data type="int"/>
3368	               </element>
3369	              </optional>
3370	              <optional>
3371	               <element name="xcon:allowed-extend-mixing-end-offset">
3372	                <data type="boolean"/>
3373	               </element>
3374	              </optional>
3375	              <zeroOrMore>
3376	               <ref name="anyElement"/>
3377	              </zeroOrMore>
3378	             </element>
3379	            </zeroOrMore>
3380	            </interleave>
3381	           </define>
3382	           <!--
3383	               TIME TYPE
3384	           -->
3385	           <define name="time-type">
3386	             <data type="dateTime">
3387	               <param name="pattern">.+T.+Z.*</param>
3388	             </data>
3389	           </define>
3390	           <!--
3391	               SINGLE ROLE TYPE
3392	           -->
3393	           <define name="single-role-type">
3394	            <choice>
3395	             <value type="string">none</value>
3396	             <value type="string">administrator</value>
3397	             <value type="string">moderator</value>
3398	             <value type="string">user</value>
3399	             <value type="string">observer</value>
3400	             <value type="string">participant</value>
3401	             <ref name="free-text-extension"/>
3402	            </choice>
3403	           </define>
3404	           <!--
3405	               MIXING MODE TYPE
3406	           -->
3407	           <define name="mixing-mode-type">
3408	            <choice>
3409	             <value type="string">moderator-controlled</value>
3410	             <value type="string">FCFS</value>
3411	             <value type="string">automatic</value>
3412	             <ref name="free-text-extension"/>
3413	            </choice>
3414	           </define>
3415	           <!--
3416	               CODECS TYPE
3417	           -->
3418	           <define name="codecs-type">
3419	            <interleave>
3420	            <attribute name="decision">
3421	             <ref name="decision-type"/>
3422	            </attribute>
3423	            <ref name="anyAttribute"/>
3424	            <zeroOrMore>
3425	             <element name="xcon:codec">
3426	              <ref name="codec-type"/>
3427	             </element>
3428	            </zeroOrMore>
3429	            <zeroOrMore>
3430	             <ref name="anyElement"/>
3431	            </zeroOrMore>
3432	            </interleave>
3433	           </define>
3434	           <!--
3435	               CODEC TYPE
3436	           -->
3437	           <define name="codec-type">
3438	            <interleave>
3439	            <attribute name="name">
3440	             <text/>
3441	            </attribute>
3442	            <attribute name="policy">
3443	             <ref name="policy-type"/>
3444	            </attribute>
3445	            <ref name="anyAttribute"/>
3446	            <optional>
3447	             <element name="xcon:subtype">
3448	              <text/>
3449	             </element>
3450	            </optional>
3451	            <zeroOrMore>
3452	             <ref name="anyElement"/>
3453	            </zeroOrMore>
3454	            </interleave>
3455	           </define>
3456	           <!--
3457	               DECISION TYPE
3458	           -->
3459	           <define name="decision-type">
3460	            <choice>
3461	             <value type="string">automatic</value>
3462	             <value type="string">moderator-controlled</value>
3463	             <ref name="free-text-extension"/>
3464	            </choice>
3465	           </define>
3466	           <!--
3467	               POLICY TYPE
3468	           -->
3469	           <define name="policy-type">
3470	            <choice>
3471	             <value type="string">allowed</value>
3472	             <value type="string">disallowed</value>
3473	             <ref name="free-text-extension"/>
3474	            </choice>
3475	           </define>
3476	           <!--
3477	               CONTROL TYPE
3478	           -->
3479	           <define name="control-type">
3480	            <interleave>
3481	            <ref name="anyAttribute"/>
3482	            <optional>
3483	             <element name="xcon:mute">
3484	              <data type="boolean"/>
3485	             </element>
3486	            </optional>
3487	            <optional>
3488	             <element name="xcon:pause-video">
3489	              <data type="boolean"/>
3490	             </element>
3491	            </optional>
3492	            <optional>
3493	             <element name="xcon:gain">
3494	              <ref name="gain-type"/>
3495	             </element>
3496	            </optional>
3497	            <optional>
3498	             <element name="xcon:video-layout">
3499	              <ref name="video-layout-type"/>
3500	             </element>
3501	            </optional>
3502	            <zeroOrMore>
3503	             <ref name="anyElement"/>
3504	            </zeroOrMore>
3505	            </interleave>
3506	           </define>
3507	           <!--
3508	               GAIN TYPE
3509	           -->
3510	           <define name="gain-type">
3511	             <data type="int">
3512	               <param name="minInclusive">-127</param>
3513	               <param name="maxInclusive">127</param>
3514	             </data>
3515	           </define>
3516	           <!--
3517	               VIDEO LAYOUT TYPE
3518	           -->

3520	           <define name="video-layout-type">
3521	              <choice>
3522	               <value type="string">single-view</value>
3523	               <value type="string">dual-view</value>
3524	               <value type="string">dual-view-crop</value>
3525	               <value type="string">dual-view-2x1</value>
3526	               <value type="string">dual-view-2x1-crop</value>
3527	               <value type="string">quad-view</value>
3528	               <value type="string">multiple-3x3</value>
3529	               <value type="string">multiple-4x4</value>
3530	               <value type="string">multiple-5x1</value>
3531	               <value type="string">automatic</value>
3532	               <ref name="free-text-extension"/>
3533	              </choice>
3534	           </define>
3535	           <!--
3536	               FLOOR INFORMATION TYPE
3537	           -->
3538	           <define name="floor-information-type">
3539	            <interleave>
3540	            <ref name="anyAttribute"/>
3541	            <optional>
3542	             <element name="xcon:conference-ID">
3543	              <data type="unsignedLong"/>
3544	             </element>
3545	            </optional>
3546	            <optional>
3547	             <element name="xcon:allow-floor-events">
3548	              <data type="boolean"/>
3549	             </element>
3550	            </optional>
3551	            <optional>
3552	             <element name="xcon:floor-request-handling">
3553	              <ref name="floor-request-type"/>
3554	             </element>
3555	            </optional>
3556	            <optional>
3557	             <element name="xcon:conference-floor-policy">
3558	              <ref name="conference-floor-policy"/>
3559	             </element>
3560	            </optional>
3561	            <zeroOrMore>
3562	             <ref name="anyElement"/>
3563	            </zeroOrMore>
3564	            </interleave>
3565	           </define>
3566	           <!--
3567	               FLOOR REQUEST TYPE
3568	           -->
3569	           <define name="floor-request-type">
3570	            <choice>
3571	             <value type="string">block</value>
3572	             <value type="string">confirm</value>
3573	             <ref name="free-text-extension"/>
3574	            </choice>
3575	           </define>
3576	           <!--
3577	               CONFERENCE FLOOR POLICY
3578	           -->
3579	           <define name="conference-floor-policy">
3580	            <interleave>
3581	            <ref name="anyAttribute"/>
3582	            <oneOrMore>
3583	             <element name="xcon:floor">
3584	              <interleave>
3585	              <attribute name="id">
3586	               <text/>
3587	              </attribute>
3588	              <ref name="anyAttribute"/>
3589	              <oneOrMore>
3590	               <element name="xcon:media-label">
3591	                <data type="nonNegativeInteger"/>
3592	               </element>
3593	              </oneOrMore>
3594	              <optional>
3595	               <element name="xcon:algorithm">
3596	                <ref name="algorithm-type"/>
3597	               </element>
3598	              </optional>
3599	              <optional>
3600	               <element name="xcon:max-floor-users">
3601	                <data type="nonNegativeInteger"/>
3602	               </element>
3603	              </optional>
3604	              <optional>
3605	               <element name="xcon:moderator-id">
3606	                <data type="nonNegativeInteger"/>
3607	               </element>
3608	              </optional>
3609	              <zeroOrMore>
3610	               <ref name="anyElement"/>
3611	              </zeroOrMore>
3612	              </interleave>
3613	             </element>
3614	            </oneOrMore>
3615	            </interleave>
3616	           </define>
3617	           <!--
3618	               ALGORITHM POLICY
3619	           -->
3620	           <define name="algorithm-type">
3621	            <choice>
3622	             <value type="string">moderator-controlled</value>
3623	             <value type="string">FCFS</value>
3624	             <value type="string">random</value>
3625	             <ref name="free-text-extension"/>
3626	            </choice>
3627	           </define>
3628	           <!--
3629	               USERS ADMISSION POLICY
3630	           -->
3631	           <define name="user-admission-policy-type">
3632	            <choice>
3633	             <value type="string">closedAuthenticated</value>
3634	             <value type="string">openAuthenticated</value>
3635	             <value type="string">anonymous</value>
3636	             <ref name="free-text-extension"/>
3637	            </choice>

3639	           </define>
3640	           <!--
3641	               JOIN HANDLING TYPE
3642	           -->
3643	           <define name="join-handling-type">
3644	            <choice>
3645	             <value type="string">block</value>
3646	             <value type="string">confirm</value>
3647	             <value type="string">allow</value>
3648	             <value type="string">authenticate</value>
3649	             <value type="string">directed-operator</value>
3650	             <ref name="free-text-extension"/>
3651	            </choice>
3652	           </define>
3653	           <!--
3654	               DENY USERLIST
3655	           -->
3656	           <define name="deny-user-list-type">
3657	            <interleave>
3658	            <ref name="anyAttribute"/>
3659	            <zeroOrMore>
3660	             <element name="xcon:target">
3661	              <attribute name="uri">
3662	               <data type="anyURI"/>
3663	              </attribute>
3664	              <ref name="anyAttribute"/>
3665	             </element>
3666	            </zeroOrMore>
3667	            <zeroOrMore>
3668	             <ref name="anyElement"/>
3669	            </zeroOrMore>
3670	            </interleave>
3671	           </define>
3672	           <!--
3673	               ALLOWED USERS LIST TYPE
3674	           -->
3675	           <define name="allowed-users-list-type">
3676	            <interleave>
3677	            <ref name="anyAttribute"/>
3678	            <zeroOrMore>
3679	             <element name="xcon:target">
3680	              <ref name="target-type"/>
3681	             </element>
3682	            </zeroOrMore>
3683	            <optional>
3684	             <element name="xcon:persistent-list">
3685	              <ref name="persistent-list-type"/>
3686	             </element>
3687	            </optional>
3688	            <zeroOrMore>
3689	             <ref name="anyElement"/>
3690	            </zeroOrMore>
3691	            </interleave>
3692	           </define>
3693	           <!--
3694	               PERSISTENT LIST TYPE
3695	           -->
3696	           <define name="persistent-list-type">
3697	            <interleave>
3698	              <zeroOrMore>
3699	               <element name="xcon:user">
3700	                <interleave>
3701	                <attribute name="name">
3702	                 <text/>
3703	                </attribute>
3704	                <attribute name="nickname">
3705	                 <text/>
3706	                </attribute>
3707	                <attribute name="id">
3708	                 <text/>
3709	                </attribute>
3710	                <ref name="anyAttribute"/>
3711	                <zeroOrMore>
3712	                 <element name="xcon:e-mail">
3713	                  <text/>
3714	                 </element>
3715	                </zeroOrMore>
3716	                <zeroOrMore>
3717	                 <ref name="anyElement"/>
3718	                </zeroOrMore>
3719	                </interleave>
3720	               </element>

3722	             </zeroOrMore>
3723	             <zeroOrMore>
3724	              <ref name="anyElement"/>
3725	             </zeroOrMore>
3726	            </interleave>
3727	           </define>
3728	           <!--
3729	               TARGET TYPE
3730	           -->
3731	           <define name="target-type">
3732	            <attribute name="uri">
3733	             <data type="anyURI"/>
3734	            </attribute>
3735	            <attribute name="method">
3736	             <ref name="method-type"/>
3737	            </attribute>
3738	            <ref name="anyAttribute"/>
3739	           </define>
3740	           <!--
3741	               METHOD TYPE
3742	           -->
3743	           <define name="method-type">
3744	            <choice>
3745	             <value type="string">dial-in</value>
3746	             <value type="string">dial-out</value>
3747	             <value type="string">refer</value>
3748	             <ref name="free-text-extension"/>
3749	            </choice>
3750	           </define>
3751	           <!--
3752	               ANONYMITY TYPE
3753	           -->
3754	           <define name="provide-anonymity-type">
3755	              <choice>
3756	               <value>private</value>
3757	               <value>semi-private</value>
3758	               <value>hidden</value>
3759	               <ref name="free-text-extension"/>
3760	              </choice>
3761	           </define>
3762	           <!--
3763	               MIXER TYPE
3764	           -->
3765	           <define name="mixer-type">
3766	            <interleave>
3767	            <attribute name="name">
3768	             <ref name="mixer-name-type"/>
3769	            </attribute>
3770	            <ref name="anyAttribute"/>
3771	            <zeroOrMore>
3772	             <element name="xcon:floor">
3773	              <attribute name="id">
3774	               <text/>
3775	              </attribute>
3776	              <ref name="anyAttribute"/>
3777	              <data type="boolean"/>
3778	             </element>
3779	            </zeroOrMore>
3780	            <zeroOrMore>
3781	             <element name="xcon:controls">
3782	              <ref name="control-type"/>
3783	             </element>
3784	            </zeroOrMore>
3785	            <zeroOrMore>
3786	             <ref name="anyElement"/>
3787	            </zeroOrMore>
3788	            </interleave>
3789	           </define>
3790	           <!--
3791	               MIXER NAME TYPE
3792	           -->
3793	           <define name="mixer-name-type">
3794	             <choice>
3795	              <value>VideoIn</value>
3796	              <value>VideoOut</value>
3797	              <value>AudioOut</value>
3798	              <value>AudioIn</value>
3799	              <ref name="free-text-extension"/>
3800	             </choice>
3801	           </define>
3802	           <!--
3803	               FREE TEXT EXTENSION
3804	           -->
3805	           <define name="free-text-extension">
3806	            <text/>
3807	           </define>

3809	           <!--
3810	            *********************************
3811	            EXTENSIBILITY OF THE SCHEMA
3812	            *********************************
3813	           -->
3814	           <!--
3815	               EXTENSIBILITY ELEMENTS
3816	           -->
3817	           <define name="anyElement">
3818	            <element>
3819	             <anyName>
3820	              <except>
3821	               <name>conference-description</name>
3822	               <name>host-info</name>
3823	               <name>conference-state</name>
3824	               <name>users</name>
3825	               <name>sidebars-by-ref</name>
3826	               <name>sidebars-by-val</name>
3827	               <name>display-text</name>
3828	               <name>subject</name>
3829	               <name>free-text</name>
3830	               <name>keywords</name>
3831	               <name>conf-uris</name>
3832	               <name>service-uris</name>
3833	               <name>maximum-user-count</name>
3834	               <name>available-media</name>
3835	               <name>web-page</name>
3836	               <name>uris</name>
3837	               <name>uri</name>
3838	               <name>user-count</name>
3839	               <name>active</name>
3840	               <name>locked</name>
3841	               <name>entry</name>
3842	               <name>type</name>
3843	               <name>status</name>
3844	               <name>purpose</name>
3845	               <name>modified</name>
3846	               <name>user</name>
3847	               <name>associated-aors</name>
3848	               <name>roles</name>
3849	               <name>languages</name>
3850	               <name>cascaded-focus</name>
3851	               <name>endpoint</name>
3852	               <name>referred</name>
3853	               <name>joining-method</name>
3854	               <name>joining-info</name>
3855	               <name>disconnection-method</name>
3856	               <name>disconnection-info</name>
3857	               <name>media</name>
3858	               <name>call-info</name>
3859	               <name>when</name>
3860	               <name>reason</name>
3861	               <name>by</name>
3862	               <name>sip</name>
3863	               <name>call-id</name>
3864	               <name>from-tag</name>
3865	               <name>to-tag</name>
3866	               <name>label</name>
3867	               <name>src-id</name>
3868	               <name>xcon:conference-password</name>
3869	               <name>xcon:mixing-mode</name>
3870	               <name>xcon:codecs</name>
3871	               <name>xcon:controls</name>
3872	               <name>xcon:language</name>
3873	               <name>xcon:allow-sidebars</name>
3874	               <name>xcon:cloning-parent</name>
3875	               <name>xcon:sidebar-parent</name>
3876	               <name>xcon:allow-conference-event-subscription</name>
3877	               <name>xcon:to-mixer</name>
3878	               <name>xcon:provide-anonymity</name>
3879	               <name>xcon:allow-refer-users-dynamically</name>
3880	               <name>xcon:allow-invite-users-dynamically</name>
3881	               <name>xcon:allow-remove-users-dynamically</name>
3882	               <name>xcon:from-mixer</name>
3883	               <name>xcon:join-handling</name>
3884	               <name>xcon:user-admission-policy</name>
3885	               <name>xcon:allowed-users-list</name>
3886	               <name>xcon:deny-users-list</name>
3887	               <name>xcon:floor-information</name>
3888	               <name>xcon:conference-time</name>
3889	               <name>xcon:provide-anonymity</name>
3890	               <name>xcon:floor</name>
3891	               <name>xcon:entry</name>
3892	               <name>xcon:mixing-start-offset</name>
3893	               <name>xcon:mixing-end-offset</name>
3894	               <name>xcon:can-join-after-offset</name>
3895	               <name>xcon:must-join-before-offset</name>
3896	               <name>xcon:request-user</name>
3897	               <name>xcon:notify-end-of-conference</name>
3898	               <name>xcon:allowed-extend-mixing-end-offset</name>
3899	               <name>xcon:codec</name>
3900	               <name>xcon:subtype</name>
3901	               <name>xcon:mute</name>
3902	               <name>xcon:pause-video</name>
3903	               <name>xcon:gain</name>
3904	               <name>xcon:video-layout</name>
3905	               <name>xcon:conference-ID</name>
3906	               <name>xcon:allow-floor-events</name>
3907	               <name>xcon:floor-request-handling</name>
3908	               <name>xcon:conference-floor-policy</name>
3909	               <name>xcon:media-label</name>
3910	               <name>xcon:algorithm</name>
3911	               <name>xcon:max-floor-users</name>
3912	               <name>xcon:moderator-id</name>
3913	               <name>xcon:target</name>
3914	               <name>xcon:persistent-list</name>
3915	               <name>xcon:e-mail</name>
3916	               <name>xcon:user</name>
3917	              </except>
3918	             </anyName>
3919	             <ref name="anyExtension"/>
3920	            </element>
3921	           </define>

3923	           <define name="anyExtension">
3924	            <zeroOrMore>
3925	             <choice>
3926	              <attribute>
3927	               <anyName/>
3928	              </attribute>
3929	              <ref name="any"/>
3930	             </choice>
3931	            </zeroOrMore>
3932	           </define>

3934	           <define name="any">
3935	            <element>
3936	             <anyName/>
3937	             <zeroOrMore>
3938	              <choice>
3939	               <attribute>
3940	                <anyName/>
3941	               </attribute>
3942	               <text/>
3943	               <ref name="any"/>
3944	              </choice>
3945	             </zeroOrMore>
3946	           </element>
3947	           </define>

3949	           <!--
3950	               EXTENSIBILITY ATTRIBUTES
3951	           -->

3953	           <define name="anyAttribute">
3954	            <zeroOrMore>
3955	             <attribute>
3956	              <anyName>
3957	               <except>
3958	                <name ns="http://www.w3.org/XML/1998/namespace">lang
3959	                </name>
3960	                <name ns="">entity</name>
3961	                <name ns="">required-participant</name>
3962	                <name ns="">label</name>
3963	                <name ns="">decision</name>
3964	                <name ns="">name</name>
3965	                <name ns="">policy</name>
3966	                <name ns="">uri</name>
3967	                <name ns="">method</name>
3968	                <name ns="">id</name>
3969	                <name ns="">nickname</name>
3970	               </except>
3971	              </anyName>
3972	             </attribute>
3973	            </zeroOrMore>
3974	           </define>
3975	          </grammar>

3977	Appendix B.  Non-Normative W3C XML Schema

3979	   The non-normative W3C XML schema defines extension elements in the
3980	   "urn:ietf:params:xml:ns:xcon-conference-info" namespace.  Note that
3981	   <xs:any> extensions in this schema are stricter than in the normative
3982	   RELAX NG schema [RELAX], and the normative RELAX NG schema [RELAX]
3983	   allows unordered child elements unlike this schema (and the [RFC4575]
3984	   schema).  Also note that this schema allows also otherwise valid
3985	   extension elements to appear in the non-allowed positions.  Likewise
3986	   the cardinalities of these extension elements can not be constrained
3987	   with this schema.

3989	<?xml version="1.0" encoding="UTF-8"?>
3990	  <xs:schema
3991	     xmlns="urn:ietf:params:xml:ns:xcon-conference-info"
3992	     xmlns:info="urn:ietf:params:xml:ns:conference-info"
3993	     xmlns:xs="http://www.w3.org/2001/XMLSchema"
3994	     attributeFormDefault="unqualified" elementFormDefault="qualified"
3995	     targetNamespace="urn:ietf:params:xml:ns:xcon-conference-info">

3997	    <xs:import namespace="urn:ietf:params:xml:ns:conference-info"
3998	      schemaLocation="rfc4575.xsd"/>

4000	    <xs:import namespace="http://www.w3.org/XML/1998/namespace"
4001	      schemaLocation="http://www.w3.org/2001/03/xml.xsd"/>

4003	    <xs:element name="mixing-mode" type="mixing-mode-type"/>
4004	    <xs:element name="codecs" type="codecs-type"/>
4005	    <xs:element name="conference-password" type="xs:string"/>
4006	    <xs:element name="controls" type="controls-type"/>
4007	    <xs:element name="language" type="xs:language"/>
4008	    <xs:element name="allow-sidebars" type="xs:boolean"/>
4009	    <xs:element name="cloning-parent" type="xs:anyURI"/>
4010	    <xs:element name="sidebar-parent" type="xs:anyURI"/>
4011	    <xs:element name="conference-time" type="conference-time-type"/>
4012	    <xs:element name="allow-conference-event-subscription"
4013	      type="xs:boolean"/>
4014	    <xs:element name="to-mixer" type="mixer-type"/>
4015	    <xs:element name="provide-anonymity"
4016	      type="provide-anonymity-type"/>
4017	    <xs:element name="allow-refer-users-dynamically"
4018	      type="xs:boolean"/>
4019	    <xs:element name="allow-invite-users-dynamically"
4020	      type="xs:boolean"/>
4021	    <xs:element name="allow-remove-users-dynamically"
4022	      type="xs:boolean"/>
4023	    <xs:element name="from-mixer" type="mixer-type"/>
4024	    <xs:element name="join-handling" type="join-handling-type"/>
4025	    <xs:element name="user-admission-policy"
4026	      type="user-admission-policy-type"/>
4027	    <xs:element name="allowed-users-list"
4028	      type="allowed-users-list-type"/>
4029	    <xs:element name="deny-users-list" type="deny-users-list-type"/>
4030	    <xs:element name="floor-information" type="floor-information-type"/>

4032	    <!-- CONFERENCE TIME -->

4034	    <xs:complexType name="conference-time-type">
4035	      <xs:sequence>
4036	        <xs:element name="entry"
4037	          minOccurs="0" maxOccurs="unbounded">
4038	          <xs:complexType>
4039	            <xs:sequence>
4040	              <xs:element name="base"
4041	                type="xs:string" minOccurs="1"/>
4042	              <xs:element name="mixing-start-offset" minOccurs="0">
4043	                <xs:complexType>
4044	                  <xs:simpleContent>
4045	                    <xs:extension base="time-type">
4046	                     <xs:attribute name="required-participant"
4047	                       type="role-type" use="required"/>
4048	                      <xs:anyAttribute namespace="##any"
4049	                        processContents="lax"/>
4050	                    </xs:extension>
4051	                  </xs:simpleContent>
4052	                </xs:complexType>
4053	              </xs:element>
4054	              <xs:element name="mixing-end-offset" minOccurs="0">
4055	                <xs:complexType>
4056	                  <xs:simpleContent>
4057	                    <xs:extension base="time-type">
4058	                      <xs:attribute name="required-participant"
4059	                        type="role-type" use="required"/>
4060	                      <xs:anyAttribute namespace="##any"
4061	                        processContents="lax"/>
4062	                    </xs:extension>
4063	                  </xs:simpleContent>
4064	                </xs:complexType>
4065	              </xs:element>
4066	              <xs:element name="can-join-after-offset" type="time-type"
4067	                minOccurs="0"/>
4068	              <xs:element name="must-join-before-offset"
4069	                type="time-type" minOccurs="0"/>
4070	              <xs:element name="request-user" type="time-type"
4071	                minOccurs="0"/>
4072	              <xs:element name="notify-end-of-conference"
4073	                type="xs:integer" minOccurs="0"/>
4074	              <xs:element name="allowed-extend-mixing-end-offset"
4075	                type="xs:boolean" minOccurs="0"/>
4076	              <xs:any namespace="##other" processContents="lax"
4077	                minOccurs="0" maxOccurs="unbounded"/>
4078	            </xs:sequence>
4079	          </xs:complexType>
4080	        </xs:element>
4081	        <xs:any namespace="##other" processContents="lax"
4082	          minOccurs="0" maxOccurs="unbounded"/>
4083	      </xs:sequence>
4084	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4085	    </xs:complexType>

4087	    <!-- TIME TYPE -->

4089	     <xs:simpleType name="time-type">
4090	      <xs:restriction base="xs:dateTime">
4091	        <xs:pattern value=".+T.+Z.*"/>
4092	       </xs:restriction>
4093	     </xs:simpleType>

4095	    <!-- ROLE-TYPE -->

4097	    <xs:simpleType name="role-type">
4098	     <xs:restriction base="xs:string">
4099	      <xs:pattern value="none"/>
4100	      <xs:pattern value="administrator"/>
4101	      <xs:pattern value="moderator"/>
4102	      <xs:pattern value="user"/>
4103	      <xs:pattern value="observer"/>
4104	      <xs:pattern value="participant"/>
4105	      <xs:pattern value=".+"/>
4106	     </xs:restriction>
4107	    </xs:simpleType>

4109	    <!-- MIXING MODE TYPE -->

4111	    <xs:simpleType name="mixing-mode-type">
4112	      <xs:restriction base="xs:string">
4113	        <xs:pattern value="moderator-controlled"/>
4114	        <xs:pattern value="FCFS"/>
4115	        <xs:pattern value="automatic"/>
4116	        <xs:pattern value=".+"/>
4117	      </xs:restriction>
4118	    </xs:simpleType>

4120	    <!-- CODECS TYPE -->

4122	    <xs:complexType name="codecs-type">
4123	      <xs:sequence>
4124	        <xs:element name="codec" type="codec-type"/>
4125	        <xs:any namespace="##other" processContents="lax"
4126	          minOccurs="0" maxOccurs="unbounded"/>
4127	      </xs:sequence>
4128	      <xs:attribute name="decision"
4129	        type="decision-type" use="required"/>
4130	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4131	    </xs:complexType>

4133	    <!-- CODEC TYPE -->

4135	    <xs:complexType name="codec-type">
4136	      <xs:sequence>
4137	        <xs:element name="subtype" type="xs:string" minOccurs="0"/>
4138	        <xs:any namespace="##other" processContents="lax"
4139	          minOccurs="0" maxOccurs="unbounded"/>
4140	      </xs:sequence>
4141	      <xs:attribute name="name"
4142	        type="xs:string" use="required"/>
4143	      <xs:attribute name="policy"
4144	        type="policy-type" use="required"/>
4145	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4146	    </xs:complexType>

4148	    <!-- DECISION TYPE -->

4150	    <xs:simpleType name="decision-type">
4151	      <xs:restriction base="xs:string">
4152	        <xs:pattern value="automatic"/>
4153	        <xs:pattern value="moderator-controlled"/>
4154	        <xs:pattern value=".+"/>
4155	      </xs:restriction>
4156	    </xs:simpleType>

4158	    <!-- POLICY TYPE -->

4160	     <xs:simpleType name="policy-type">
4161	      <xs:restriction base="xs:string">
4162	        <xs:pattern value="allowed"/>
4163	        <xs:pattern value="disallowed"/>
4164	        <xs:pattern value=".+"/>
4165	      </xs:restriction>
4166	     </xs:simpleType>

4168	    <!-- CONTROL TYPE -->

4170	    <xs:complexType name="controls-type">
4171	      <xs:sequence>
4172	        <xs:element name="mute"
4173	          type="xs:boolean" minOccurs="0"/>
4174	        <xs:element name="pause-video"
4175	          type="xs:boolean" minOccurs="0"/>
4176	        <xs:element name="gain"
4177	          type="gain-type" minOccurs="0"/>
4178	        <xs:element name="video-layout"
4179	          type="video-layout-type" default="single-view" minOccurs="0"/>
4180	        <xs:any namespace="##other" processContents="lax"
4181	          minOccurs="0" maxOccurs="unbounded"/>
4182	      </xs:sequence>
4183	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4184	    </xs:complexType>

4186	    <!-- GAIN TYPE -->

4188	    <xs:simpleType name="gain-type">
4189	      <xs:restriction base="xs:integer">
4190	        <xs:minInclusive value="-127"/>
4191	        <xs:maxInclusive value="127"/>
4192	      </xs:restriction>
4193	    </xs:simpleType>

4195	    <!-- VIDEO LAYOUT TYPE -->

4197	    <xs:simpleType name="video-layout-type">
4198	      <xs:restriction base="xs:string">
4199	        <xs:pattern value="single-view"/>
4200	        <xs:pattern value="dual-view"/>
4201	        <xs:pattern value="dual-view-crop"/>
4202	        <xs:pattern value="dual-view-2x1"/>
4203	        <xs:pattern value="dual-view-2x1-crop"/>
4204	        <xs:pattern value="quad-view"/>
4205	        <xs:pattern value="multiple-3x3"/>
4206	        <xs:pattern value="multiple-4x4"/>

4208	        <xs:pattern value="multiple-5x1"/>
4209	        <xs:pattern value="automatic"/>
4210	        <xs:pattern value=".+"/>
4211	      </xs:restriction>
4212	    </xs:simpleType>

4214	    <!-- FLOOR INFORMATION TYPE -->

4216	    <xs:complexType name="floor-information-type">
4217	      <xs:sequence>
4218	        <xs:element name="conference-ID"
4219	          type="xs:unsignedLong" minOccurs="0"/>
4220	        <xs:element name="allow-floor-events"
4221	          type="xs:boolean" default="false" minOccurs="0"/>
4222	        <xs:element name="floor-request-handling"
4223	          type="floor-request-handling-type" minOccurs="0"/>
4224	        <xs:element name="conference-floor-policy"
4225	          type="conference-floor-policy" minOccurs="0"/>
4226	        <xs:any namespace="##other" processContents="lax"
4227	          minOccurs="0" maxOccurs="unbounded"/>
4228	      </xs:sequence>
4229	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4230	    </xs:complexType>

4232	    <!-- FLOOR REQUEST TYPE -->

4234	    <xs:simpleType name="floor-request-handling-type">
4235	      <xs:restriction base="xs:string">
4236	        <xs:pattern value="block"/>
4237	        <xs:pattern value="confirm"/>
4238	        <xs:pattern value=".+"/>
4239	      </xs:restriction>
4240	    </xs:simpleType>

4242	    <!-- CONFERENCE FLOOR POLICY -->

4244	    <xs:complexType name="conference-floor-policy">
4245	      <xs:sequence>
4246	        <xs:element name="floor" maxOccurs="unbounded">
4247	          <xs:complexType>
4248	            <xs:sequence>
4249	              <xs:element name="media-label"
4250	                type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
4251	              <xs:element name="algorithm"
4252	                type="algorithm-type" minOccurs="0"/>
4253	              <xs:element name="max-floor-users"
4254	                type="xs:nonNegativeInteger" minOccurs="0"/>
4255	              <xs:element name="moderator-id"
4256	                type="xs:nonNegativeInteger" minOccurs="0"/>
4257	                <xs:any namespace="##other" processContents="lax"
4258	                  minOccurs="0" maxOccurs="unbounded"/>
4259	            </xs:sequence>
4260	            <xs:attribute name="id" type="xs:string" use="required"/>
4261	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4262	          </xs:complexType>
4263	        </xs:element>
4264	      </xs:sequence>
4265	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4266	    </xs:complexType>

4268	    <!-- ALGORITHM TYPE -->

4270	    <xs:simpleType name="algorithm-type">
4271	      <xs:restriction base="xs:string">
4272	        <xs:pattern value="moderator-controlled"/>
4273	        <xs:pattern value="FCFS"/>
4274	        <xs:pattern value="random"/>
4275	        <xs:pattern value=".+"/>
4276	      </xs:restriction>
4277	    </xs:simpleType>

4279	    <!-- USER ADMISSION POLICY TYPE -->

4281	    <xs:simpleType name="user-admission-policy-type">
4282	      <xs:restriction base="xs:string">
4283	        <xs:pattern value="closedAuthenticated"/>
4284	        <xs:pattern value="openAuthenticated"/>
4285	        <xs:pattern value="anonymous"/>
4286	        <xs:pattern value=".+"/>
4287	      </xs:restriction>
4288	    </xs:simpleType>

4290	    <!-- JOIN HANDLING TYPE -->

4292	    <xs:simpleType name="join-handling-type">
4293	      <xs:restriction base="xs:string">
4294	        <xs:pattern value="block"/>
4295	        <xs:pattern value="confirm"/>
4296	        <xs:pattern value="allow"/>
4297	        <xs:pattern value="authenticate"/>
4298	        <xs:pattern value="directed-operator"/>
4299	        <xs:pattern value=".+"/>
4300	       </xs:restriction>
4301	    </xs:simpleType>

4303	   <!-- DENY USER LIST TYPE -->

4305	    <xs:complexType name="deny-users-list-type">
4306	      <xs:sequence>
4307	        <xs:element name="target" minOccurs="0" maxOccurs="unbounded">
4308	          <xs:complexType>
4309	            <xs:attribute name="uri" use="required" type="xs:anyURI"/>
4310	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4311	          </xs:complexType>
4312	        </xs:element>
4313	        <xs:any namespace="##other" processContents="lax"
4314	          minOccurs="0" maxOccurs="unbounded"/>
4315	      </xs:sequence>
4316	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4317	    </xs:complexType>

4319	     <!-- ALLOWED USERS LIST TYPE -->

4321	    <xs:complexType name="allowed-users-list-type">
4322	      <xs:sequence>
4323	        <xs:element name="target" type="target-type"
4324	          minOccurs="0" maxOccurs="unbounded">
4325	        </xs:element>
4326	        <xs:element name="persistent-list"
4327	          type="persistent-list-type"
4328	          minOccurs="0"/>
4329	        <xs:any namespace="##other" processContents="lax"
4330	          minOccurs="0" maxOccurs="unbounded"/>
4331	      </xs:sequence>
4332	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4333	    </xs:complexType>

4335	    <!-- PERSISTENT LIST TYPE -->

4337	    <xs:complexType name="persistent-list-type">
4338	      <xs:sequence>
4339	        <xs:element name="user" minOccurs="0" maxOccurs="unbounded">
4340	          <xs:complexType>
4341	            <xs:sequence>
4342	              <xs:element name="email" type="xs:string"
4343	                minOccurs="0" maxOccurs="unbounded"/>
4344	              <xs:any namespace="##other" processContents="lax"
4345	                minOccurs="0" maxOccurs="unbounded"/>
4346	            </xs:sequence>
4347	            <xs:attribute name="name"
4348	              use="required" type="xs:anyURI"/>
4349	            <xs:attribute name="nickname"
4350	              use="required" type="xs:string"/>
4351	            <xs:attribute name="id"
4352	              use="required" type="xs:string"/>
4353	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4354	          </xs:complexType>
4355	        </xs:element>
4356	        <xs:any namespace="##other" processContents="lax"
4357	          minOccurs="0" maxOccurs="unbounded"/>
4358	      </xs:sequence>
4359	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4360	    </xs:complexType>

4362	    <!-- TARGET TYPE -->

4364	    <xs:complexType name="target-type">
4365	      <xs:attribute name="uri" use="required"
4366	        type="xs:anyURI"/>
4367	      <xs:attribute name="method" use="required"
4368	        type="method-type"/>
4369	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4370	    </xs:complexType>

4372	    <!-- METHOD TYPE -->

4374	    <xs:simpleType name="method-type">
4375	      <xs:restriction base="xs:string">
4376	        <xs:pattern value="dial-in"/>
4377	        <xs:pattern value="dial-out"/>
4378	        <xs:pattern value="refer"/>
4379	        <xs:pattern value=".+"/>
4380	      </xs:restriction>
4381	    </xs:simpleType>

4383	    <!-- ANONYMITY TYPE -->

4385	    <xs:simpleType name="provide-anonymity-type">
4386	      <xs:restriction base="xs:string">
4387	        <xs:pattern value="private"/>
4388	        <xs:pattern value="semi-private"/>
4389	        <xs:pattern value="hidden"/>
4390	        <xs:pattern value=".+"/>
4391	      </xs:restriction>
4392	    </xs:simpleType>
4393	    <!-- MIXER TYPE -->

4395	    <xs:complexType name="mixer-type">
4396	      <xs:sequence>
4397	        <xs:element name="floor">
4398	          <xs:complexType>
4399	            <xs:simpleContent>
4400	              <xs:extension base="xs:boolean">
4401	                <xs:attribute name="id" type="xs:string"
4402	                  use="required"/>
4403	                <xs:anyAttribute namespace="##any"
4404	                  processContents="lax"/>
4405	              </xs:extension>
4406	            </xs:simpleContent>
4407	          </xs:complexType>
4408	        </xs:element>
4409	        <xs:element name="controls" type="controls-type"
4410	          minOccurs="0" maxOccurs="unbounded"/>
4411	        <xs:any namespace="##other" processContents="lax"
4412	          minOccurs="0" maxOccurs="unbounded"/>
4413	      </xs:sequence>
4414	      <xs:attribute name="name" type="mixer-name-type"
4415	        use="required"/>
4416	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4417	    </xs:complexType>

4419	    <!-- MIXER NAME TYPE -->

4421	    <xs:simpleType name="mixer-name-type">
4422	      <xs:restriction base="xs:string">
4423	        <xs:pattern value="VideoIn"/>
4424	        <xs:pattern value="VideoOut"/>
4425	        <xs:pattern value="AudioOut"/>

4427	        <xs:pattern value="AudioIn"/>
4428	        <xs:pattern value=".+"/>
4429	      </xs:restriction>
4430	    </xs:simpleType>

4432	  </xs:schema>

4434	Authors' Addresses

4436	   Oscar Novo
4437	   Ericsson
4438	   Hirsalantie 11
4439	   Jorvas  02420
4440	   Finland

4442	   Email: Oscar.Novo@ericsson.com

4444	   Gonzalo Camarillo
4445	   Ericsson
4446	   Hirsalantie 11
4447	   Jorvas  02420
4448	   Finland

4450	   Email: Gonzalo.Camarillo@ericsson.com

4452	   David P. Morgan
4453	   Fidelity Investments
4454	   82 Devonshire St, MZ V3C
4455	   Boston, MA  02109-3614
4456	   USA

4458	   Email: Dave.Morgan@fmr.com

4460	   Jari Urpalainen
4461	   Nokia
4462	   Itamerenkatu 11-13
4463	   Helsinki  00180
4464	   Finland

4466	   Phone: +358 7180 37686
4467	   Email: jari.urpalainen@nokia.com