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2	XCON                                                             O. Novo
3	Internet-Draft                                              G. Camarillo
4	Intended status: Standards Track                                Ericsson
5	Expires: November 20, 2010                                     D. Morgan
6	                                                    Fidelity Investments
7	                                                           J. Urpalainen
8	                                                                   Nokia
9	                                                            May 19, 2010

11	 Conference Information Data Model for Centralized Conferencing (XCON)
12	                draft-ietf-xcon-common-data-model-19.txt

14	Abstract

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

24	Status of this Memo

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

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

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

39	   This Internet-Draft will expire on November 20, 2010.

41	Copyright Notice

43	   Copyright (c) 2010 IETF Trust and the persons identified as the
44	   document authors.  All rights reserved.

46	   This document is subject to BCP 78 and the IETF Trust's Legal
47	   Provisions Relating to IETF Documents
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49	   publication of this document.  Please review these documents
50	   carefully, as they describe your rights and restrictions with respect
51	   to this document.  Code Components extracted from this document must
52	   include Simplified BSD License text as described in Section 4.e of
53	   the Trust Legal Provisions and are provided without warranty as
54	   described in the Simplified BSD License.

56	   This document may contain material from IETF Documents or IETF
57	   Contributions published or made publicly available before November
58	   10, 2008.  The person(s) controlling the copyright in some of this
59	   material may not have granted the IETF Trust the right to allow
60	   modifications of such material outside the IETF Standards Process.
61	   Without obtaining an adequate license from the person(s) controlling
62	   the copyright in such materials, this document may not be modified
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64	   not be created outside the IETF Standards Process, except to format
65	   it for publication as an RFC or to translate it into languages other
66	   than English.

68	Table of Contents

70	   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5
71	   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  7
72	   3.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
73	     3.1.  Data Model Format  . . . . . . . . . . . . . . . . . . . .  7
74	     3.2.  Data Model Namespace . . . . . . . . . . . . . . . . . . .  7
75	     3.3.  The Conference Object Identifier . . . . . . . . . . . . .  8
76	       3.3.1.  Conference Object URI Definition . . . . . . . . . . . 10
77	       3.3.2.  Normalization and Conference Object URI Comparison . . 10
78	     3.4.  Data Model Structure . . . . . . . . . . . . . . . . . . . 10
79	   4.  Data Model Definition  . . . . . . . . . . . . . . . . . . . . 11
80	     4.1.  <conference-info>  . . . . . . . . . . . . . . . . . . . . 15
81	     4.2.  <conference-description> . . . . . . . . . . . . . . . . . 15
82	       4.2.1.  <language> . . . . . . . . . . . . . . . . . . . . . . 15
83	       4.2.2.  <display-text> . . . . . . . . . . . . . . . . . . . . 15
84	       4.2.3.  <subject>  . . . . . . . . . . . . . . . . . . . . . . 16
85	       4.2.4.  <free-text>  . . . . . . . . . . . . . . . . . . . . . 16
86	       4.2.5.  <keywords> . . . . . . . . . . . . . . . . . . . . . . 16
87	       4.2.6.  <allow-sidebars> . . . . . . . . . . . . . . . . . . . 16
88	       4.2.7.  <cloning-parent> . . . . . . . . . . . . . . . . . . . 16
89	       4.2.8.  <sidebar-parent> . . . . . . . . . . . . . . . . . . . 16
90	       4.2.9.  <conference-time>  . . . . . . . . . . . . . . . . . . 16
91	       4.2.10. <conf-uris>  . . . . . . . . . . . . . . . . . . . . . 18
92	       4.2.11. <service-uris> . . . . . . . . . . . . . . . . . . . . 18
93	       4.2.12. <maximum-user-count> . . . . . . . . . . . . . . . . . 18
94	       4.2.13. <available-media>  . . . . . . . . . . . . . . . . . . 18
95	     4.3.  <host-info>  . . . . . . . . . . . . . . . . . . . . . . . 21
96	     4.4.  <conference-state> . . . . . . . . . . . . . . . . . . . . 21
97	       4.4.1.  <allow-conference-event-subscription>  . . . . . . . . 21
98	       4.4.2.  <user-count> . . . . . . . . . . . . . . . . . . . . . 21
99	       4.4.3.  <active> . . . . . . . . . . . . . . . . . . . . . . . 21
100	       4.4.4.  <locked> . . . . . . . . . . . . . . . . . . . . . . . 21
101	     4.5.  <floor-information>  . . . . . . . . . . . . . . . . . . . 21
102	       4.5.1.  <conference-ID>  . . . . . . . . . . . . . . . . . . . 22
103	       4.5.2.  <allow-floor-events> . . . . . . . . . . . . . . . . . 22
104	       4.5.3.  <floor-request-handling> . . . . . . . . . . . . . . . 22
105	       4.5.4.  <conference-floor-policy>  . . . . . . . . . . . . . . 23
106	     4.6.  <users>  . . . . . . . . . . . . . . . . . . . . . . . . . 23
107	       4.6.1.  <join-handling>  . . . . . . . . . . . . . . . . . . . 24
108	       4.6.2.  <user-admission-policy>  . . . . . . . . . . . . . . . 24
109	       4.6.3.  <allowed-users-list> . . . . . . . . . . . . . . . . . 25
110	       4.6.4.  <deny-users-list>  . . . . . . . . . . . . . . . . . . 26
111	       4.6.5.  <user> and Its <user> Sub-elements . . . . . . . . . . 26
112	         4.6.5.1.  <display-text> . . . . . . . . . . . . . . . . . . 27
113	         4.6.5.2.  <associated-aors>  . . . . . . . . . . . . . . . . 27
114	         4.6.5.3.  <provide-anonymity>  . . . . . . . . . . . . . . . 27
115	         4.6.5.4.  <roles>  . . . . . . . . . . . . . . . . . . . . . 28
116	         4.6.5.5.  <languages>  . . . . . . . . . . . . . . . . . . . 28
117	         4.6.5.6.  <cascaded-focus> . . . . . . . . . . . . . . . . . 28
118	         4.6.5.7.  <allow-refer-users-dynamically>  . . . . . . . . . 28
119	         4.6.5.8.  <allow-invite-users-dynamically> . . . . . . . . . 28
120	         4.6.5.9.  <allow-remove-users-dynamically> . . . . . . . . . 29
121	         4.6.5.10. <endpoint> . . . . . . . . . . . . . . . . . . . . 29
122	     4.7.  <sidebars-by-ref>  . . . . . . . . . . . . . . . . . . . . 30
123	     4.8.  <sidebars-by-val>  . . . . . . . . . . . . . . . . . . . . 30
124	   5.  RELAX NG Schema  . . . . . . . . . . . . . . . . . . . . . . . 30
125	   6.  XML Schema Extensibility . . . . . . . . . . . . . . . . . . . 41
126	   7.  XML Example  . . . . . . . . . . . . . . . . . . . . . . . . . 41
127	   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 51
128	     8.1.  Authentication, Access Control, and Integrity  . . . . . . 51
129	     8.2.  Confidentiality  . . . . . . . . . . . . . . . . . . . . . 52
130	   9.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 52
131	     9.1.  Relax NG Schema Registration . . . . . . . . . . . . . . . 52
132	     9.2.  XML Namespace Registration . . . . . . . . . . . . . . . . 52
133	     9.3.  Conference Object Identifier Registration  . . . . . . . . 53
134	     9.4.  Conference User Identifier Registration  . . . . . . . . . 54
135	   10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 54
136	   11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 55
137	     11.1. Normative References . . . . . . . . . . . . . . . . . . . 55
138	     11.2. Informative References . . . . . . . . . . . . . . . . . . 55
139	   Appendix A.  Non-Normative RELAX NG Schema in XML Syntax . . . . . 56
140	   Appendix B.  Non-Normative W3C XML Schema  . . . . . . . . . . . . 84
141	   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 93

143	1.  Introduction

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

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

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

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

183	      ...............................................................
184	      . Conferencing Server                                         .
185	      .       +---------------------------------------------------+ .
186	      .       |       C o n f e r e n c e   o b j e c t           | .
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	      .   | | Conference Information Data Model                |||| .
193	      .   | | +----------------------------------------------+ |||| .
194	      .   | | | Conference description  (times, duration)    | |||| .
195	      .   | | +----------------------------------------------+ |||| .
196	      .   | | +----------------------------------------------+ |||| .
197	      .   | | | Host information                             | |||| .
198	      .   | | +----------------------------------------------+ |||| .
199	      .   | | +----------------------------------------------+ |||| .
200	      .   | | | Conference state                             | |||| .
201	      .   | | +----------------------------------------------+ |||| .
202	      .   | | +----------------------------------------------+ |||| .
203	      .   | | | Floor information                            | |||| .
204	      .   | | +----------------------------------------------+ |||| .
205	      .   | | +----------------------------------------------+ |||| .
206	      .   | | | Membership (users, capacity)                 | |||| .
207	      .   | | +----------------------------------------------+ |||| .
208	      .   | | +----------------------------------------------+ |||| .
209	      .   | | | Sidebars, Etc.                               | |||| .
210	      .   | | +----------------------------------------------+ |||| .
211	      .   | | +----------------------------------------------+ |||| .
212	      .   | | | Etc.                                         | |||| .
213	      .   | | +----------------------------------------------+ |||+ .
214	      .   | +--------------------------------------------------+|+  .
215	      .   +----^------------------^-------------^--------|------+   .
216	      .        |                  |             |        |          .
217	      . +------v-------+ +--------v-----+ +-----v-+ +----v-------+  .
218	      . | Conference   | | Floor        | |       | |            |  .
219	      . | Control      | | Control      | |Foci   | |Notification|  .
220	      . | Server       | | Server       | |       | |Service     |  .
221	      . +-----^--------+ +---^----------+ +-^-----+ +------------+  .
222	      ........|..............|..............|..........|.............
223	              |Conference    |Floor         |Call      |Notification
224	              |Control       |Control       |Signaling |Protocol
225	              |Protocol      |Protocol      |Protocol  |
226	      ........v..............v..............v..........v.............
227	      .     C  o  n  f  e  r  e  n  c  i  n  g     C  l i  e  n  t  .
228	      ...............................................................

230	                 Figure 1: Conference Server Architecture

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

243	2.  Terminology

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

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

255	3.  Overview

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

267	3.1.  Data Model Format

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

274	3.2.  Data Model Namespace

276	   This specification defines a new namespace specification for
277	   identifying the elements defined in the data model.  This namespace
278	   is as follows:

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

282	3.3.  The Conference Object Identifier

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

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

303	                            +--------------------------+
304	                            |       Conference         |
305	                            |         Object           |
306	                            |       Identifier         |
307	                            +--------------------------+
308	                            |  xcon:Ji092i@example.com |
309	                            +------+-------------------+
310	                                        |
311	                                        |
312	                                        |
313	                      +-----------------+---------------+
314	                      |                                 |
315	          +-----------+-----------+          +----------+---------+
316	          |   CSP Conference IDs  |          |BFCP 'Conference ID'|
317	          +-----------------------+          +--------------------+
318	          | h323:i092@example.com |          |        i092        |
319	          | tel:+44(0)2920930033  |          +----------+---------+
320	          | sip:i092@example.com  |                     |
321	          +-----------------------+             +-------+--------+
322	                                                | BFCP 'Floor ID'|
323	                                                +----------------+
324	                                                |      543       |
325	                                                |      236       |
326	                                                +----------------+

328	                    Figure 2: Conference Object Mapping

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

350	   Further elements can be added to the tree representation in Figure 2
351	   to enable a complete representation of a conference instance within a
352	   conferencing system.

354	3.3.1.  Conference Object URI Definition

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

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

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

362	3.3.2.  Normalization and Conference Object URI Comparison

364	   In order to facilitate the comparison of the XCON-URI identifiers,
365	   all the components of the identifiers SHOULD be converted to
366	   lowercase.  After normalizing the URI strings, the URIs comparison
367	   SHOULD applied a character-by-character basis as prescribed by
368	   RFC3986, Section 6.2.1.

370	3.4.  Data Model Structure

372	   The information in this data model is structured in the following
373	   manner.  All the information related to a conference is contained in
374	   a <conference-info> element.  The <conference-info> element contains
375	   the following child elements:

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

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

402	4.  Data Model Definition

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

411	   !<conference-info>
412	        |
413	        |--!<conference-description>
414	        |     |--<language>*
415	        |     |--<display-text>
416	        |     |--<subject>
417	        |     |--<free-text>
418	        |     |--<keywords>
419	        |     |--<allow-sidebars>*
420	        |     |--<cloning-parent>*
421	        |     |--<sidebar-parent>*
422	        |     |--<conference-time>*
423	        |     |      |--<entry>*
424	        |     |      |    |--<base>*
425	        |     |      |    |--<mixing-start-offset>*
426	        |     |      |    |--<mixing-end-offset>*
427	        |     |      |    |--<can-join-after-offset>*
428	        |     |      |    |--<must-join-before-offset>*
429	        |     |      |    |--<request-user>*
430	        |     |      |    |--<notify-end-of-conference>*
431	        |     |      |    |--<allowed-extend-mixing-end-offset>*
432	        |     |           ...
433	        |     |--<conf-uris>
434	        |     |      |--<entry>
435	        |     |      |    |--<uri>
436	        |     |      |    |--<display-text>
437	        |     |      |    |--<purpose>
438	        |     |      |    |--<conference-password>*
439	        |     |      ...
440	        |     |--<service-uris>
441	        |     |      |--<entry>
442	        |     |      |    |--<uri>
443	        |     |      |    |--<display-text>
444	        |     |      |    |--<purpose>
445	        |     |      ...
446	        |     |--<maximum-user-count>
447	        |     |      ...
448	        |     |--<available-media>
449	        |     |      |--!<entry>
450	        |     |      |     |--<display-text>
451	        |     |      |     |--<type>
452	        |     |      |     |--<status>
453	        |     |      |     |--<mixing-mode>*
454	        |     |      |     |--<codecs>*
455	        |     |      |     |    |--<codec>*
456	        |     |      |     |    |    |--<subtype>*
457	        |     |      |     |    |--<codec>*
458	        |     |      |     |    |    |--<subtype>*
459	        |     |      |     |    ...
460	        |     |      |     |--<controls>*
461	        |     |      |     |    |--<mute>*
462	        |     |      |     |    |--<gain>*
463	        |     |      |     |   ...
464	        |     |      |--<entry>
465	        |     |      |     |--<display-text>
466	        |     |      |     |--<type>
467	        |     |      |     |--<status>
468	        |     |      |     |--<mixing-mode>*
469	        |     |      |     |--<codecs>*
470	        |     |      |     |    |--<codec>*
471	        |     |      |     |    |    |--<subtype>*
472	        |     |      |     |    |--<codec>*
473	        |     |      |     |    |    |--<subtype>*
474	        |     |      |     |    ...
475	        |     |      |     |--<controls>*
476	        |     |      |     |    |--<pause-video>*
477	        |     |      |     |    |--<video-layout>*
478	        |     |      |     |   ...
479	        |     |      ...
480	        |
481	        |--<host-info>
482	        |     |--<display-text>
483	        |     |--<web-page>
484	        |     |--<uris>
485	        |     |     |--<entry>
486	        |     |     |    |--<uri>
487	        |     |     |    |--<display-text>
488	        |           ...
489	        |--<conference-state>
490	        |     |--<allow-conference-event-subscription>*
491	        |     |--<user-count>
492	        |     |--<active>
493	        |     |--<locked>
494	        |
495	        |--<floor-information>*
496	        |     |--<conference-ID>*
497	        |     |--<allow-floor-events>*
498	        |     |--<floor-request-handling>*
499	        |     |--<conference-floor-policy>*
500	        |     |     |--<floor>*
501	        |     |     |    |--!<media-label>*
502	        |     |     |    |--!<algorithm>*
503	        |     |     |    |--<max-floor-users>*
504	        |     |     |    |--<moderator-id>*
505	        |     |     |   ...
506	        |     |     ...
507	        |
508	        |--!<users>
509	        |     |--<join-handling>*
510	        |     |--<user-admission-policy>*
511	        |     |--<allowed-users-list>*
512	        |     |     |--<target>*
513	        |     |     |
514	        |     |     |--<persistent-list>*
515	        |     |     |     |--<user>*
516	        |     |     |     |     |-- <email>*
517	        |     |
518	        |     |--<deny-users-list>*
519	        |     |
520	        |     |--<user>
521	        |     |    |--<display-text>
522	        |     |    |--<associated-aors>
523	        |     |    |--<provide-anonymity>*
524	        |     |    |--<roles>
525	        |     |    |    |
526	        |     |    |   ...
527	        |     |    |--<languages>
528	        |     |    |--<cascaded-focus>
529	        |     |    |--<allow-refer-users-dynamically>*
530	        |     |    |--<allow-invite-users-dynamically>*
531	        |     |    |--<allow-remove-users-dynamically>*
532	        |     |    |--!<endpoint>
533	        |     |    |      |--<display-text>
534	        |     |    |      |--<referred>
535	        |     |    |      |--<status>
536	        |     |    |      |--<joining-method>
537	        |     |    |      |--<joining-info>
538	        |     |    |      |--<disconnection-method>
539	        |     |    |      |--<disconnection-info>
540	        |     |    |      |--<media>
541	        |     |    |      |    |--<type>
542	        |     |    |      |    |--<display-text>
543	        |     |    |      |    |--<label>
544	        |     |    |      |    |--<src-id>
545	        |     |    |      |    |--<status>
546	        |     |    |      |    |--<to-mixer>*
547	        |     |    |      |    |      |--<floor>*
548	        |     |    |      |    |      |--<controls>*
549	        |     |    |      |    |      |      |--<mute>*
550	        |     |    |      |    |      |      |--<gain>*
551	        |     |    |      |    |      |     ...
552	        |     |    |      |    |--<from-mixer>*
553	        |     |    |      |    |      |--<floor>*
554	        |     |    |      |    |      |--<controls>*
555	        |     |    |      |    |      |      |--<pause-video>*
556	        |     |    |      |    |      |     ...
557	        |     |    |      |   ...
558	        |     |    |      |--<call-info>
559	        |     |    |      |    |--<sip>
560	        |     |    |      |    |   |--<display-text>
561	        |     |    |      |    |   |--<call-id>
562	        |     |    |      |    |   |--<from-tag>
563	        |     |    |      |    |   |--<to-tag>
564	        |          ...    ...
565	        |--<sidebars-by-ref>
566	        |     |--<entry>
567	        |     |     |-- <user>
568	        |     |     |-- <display-text>
569	        |     |--<entry>
570	        |     |     |-- <user>
571	        |     |     |-- <display-text>
572	        |     ...
573	        |--<sidebars-by-val>
574	        |     |--<entry>
575	        |     |     |
576	        |     |    ...
577	        |     |--<entry>
578	        |     |     |
579	        |     ...   ...

581	                      Figure 3: Non-normative diagram

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

586	4.1.  <conference-info>

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

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

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

606	4.2.  <conference-description>

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

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

620	4.2.1.  <language>

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

630	4.2.2.  <display-text>

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

634	4.2.3.  <subject>

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

638	4.2.4.  <free-text>

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

642	4.2.5.  <keywords>

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

646	4.2.6.  <allow-sidebars>

648	   The <allow-sidebars> element represents a boolean value.  If set to
649	   TRUE, the conference is allowed to create sidebar conferences.  If
650	   absent, or set to FALSE, the conference can not create sidebar
651	   conferences.

653	4.2.7.  <cloning-parent>

655	   When the <cloning-parent> is present, it indicates that the
656	   conference object is a child of a parent conference.  The <cloning-
657	   parent> element contains the conference object Identifier (XCON-URI)
658	   (different from the main XCON-URI) of the parent.

660	4.2.8.  <sidebar-parent>

662	   When the <sidebar-parent> is present, it indicates that the
663	   conference object represents a sidebar of another conference.  The
664	   <sidebar-parent> element contains the conference object Identifier
665	   (XCON-URI) (different from the main XCON-URI) of the parent.

667	4.2.9.  <conference-time>

669	   The <conference-time> element contains the information related to
670	   conference time, policy, and duration of a conference.  The
671	   <conference-time> element contains one or more <entry> elements each
672	   defining the time and policy information specifying a single
673	   conference occurrence.  The <conference-time> element differs from
674	   the iCalendar objects [RFC5545] in the possibility to defined
675	   different policies (<can-join-after-offset>, <must-join-before-
676	   offset>) for the same conference at different times.

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

680	   o  <base>: The <base> child element specifies the iCalendar object of
681	      the conference.  The iCalendar object components are defined in
682	      [RFC5545].
683	   o  <mixing-start-offset>: The <mixing-start-offset> child element
684	      specifies when the conference media mixing starts before the
685	      conference starts.  If the <mixing-start-offset> element is not
686	      present, it indicates that the conference media mixing starts
687	      immediately.  The <mixing-start-offset> has the mandatory
688	      'required-participant' attribute.  This attribute contains one of
689	      the following values: "none", "administrator", "moderator",
690	      "user", "observer", and "participant".  The roles semantic
691	      definition is out of the scope of this document and is subject to
692	      future policy documents.  More values can be specified in the
693	      future.  The 'required-participant' attribute allows a privileged
694	      user to define when media mixing starts based on the latter of the
695	      mixing start time, and the time the first participant arrives.  If
696	      the value is set to "none'", mixing starts according to the mixing
697	      start time.
698	   o  <mixing-end-offset>: The <mixing-end-offset> child element that
699	      specifies the time a conference media mixing stops after the
700	      conference stops.  If the <mixing-end-offset> element is not
701	      present, it indicates that the conference occurrence is not
702	      bounded.  The <mixing-end-offset> element has the mandatory
703	      'required-participant' attribute.  This attribute contains one of
704	      the following values: "none", "administrator", "moderator",
705	      "observer", "user", and "participant".  More values can be
706	      specified in the future.  The 'required-participant' attribute
707	      allows a privileged user to define when media mixing ends based on
708	      the earlier of the <mixing-end-offset>, and the time the last
709	      participant leaves.  If the value is set to "none", mixing stops
710	      according to the <mixing-end-offset>.  If the conference policy
711	      was modified so that last privileged user is now a normal
712	      conference participant, and the conference requires a privileged
713	      user to continue; that conference MUST terminate.
714	   o  <can-join-after-offset>: An administrator can indicate the time
715	      when users can join a conference by populating the <can-join-
716	      after-offset> element.
717	   o  <must-join-before-offset>: An administrator can define the time
718	      after which new users are not allowed to join the conference
719	      anymore.
720	   o  <request-user>: It is possible to define the time when users or
721	      resources on the <allowed-users-list> are requested to join the
722	      conference by using the <request-users> element.
723	   o  <notify-end-of-conference>: The <notify-end-of-conference> element
724	      defines in seconds when the system has to send a notification when
725	      the end of the conference is approaching.  If the <notify-end-of-
726	      conference> element is not present, it indicates that the system
727	      does not notify the users when the end of the conference is
728	      approaching.
729	   o  <allowed-extend-mixing-end-offset>: The <allowed-extend-mixing-
730	      end-offset> refers to the possibility to extend the conference.
731	      It has a boolean value.

733	4.2.10.  <conf-uris>

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

744	4.2.11.  <service-uris>

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

751	4.2.12.  <maximum-user-count>

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

758	4.2.13.  <available-media>

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

766	   o  The <type> element is described in section 5.3.4 of [RFC4575].
767	   o  The <display-text> element is described in section 5.3.4 of
768	      [RFC4575].
769	   o  The <status> element is described in section 5.3.4 of [RFC4575].
770	   o  The child element <mixing-mode> describes a default scheduling
771	      policy by which the mixer will build the outgoing stream from the
772	      incoming streams.  Note that this policy is different than the
773	      policy describing the floors for each media.  The <mixing-mode>
774	      child element MUST contain one and only one of the "Moderator-
775	      controlled", "FCFS", and "Automatic" values indicating the default
776	      algorithm to use with every media stream.  The "Moderator-
777	      controlled" value indicates that the moderator of the conference,
778	      controls the media stream policy.  The "FCFS" value indicates a
779	      'first-come-first-served' policy.  The "Automatic" value means the
780	      mixer choose the best scheduling policy for the conference.
781	   o  The <codecs> element specifies the allowed codecs in the
782	      conference.  It has an attribute 'decision' that specifies if the
783	      focus decides the common codec automatically or needs the approval
784	      of the moderator of the conference ("automatic", "moderator-
785	      controlled").  The <codecs> element contains <codec> elements.  A
786	      <codec> element can have the attribute 'name' and 'policy'.  The
787	      'name' attribute is a codec identifier assigned by the
788	      conferencing server.  The 'policy' attribute contains the policy
789	      for that codec (allowed, or disallowed).  The <codec> element has
790	      the child element <subtype> which stores the codec's name.  The
791	      possible values of this element are the values of the 'subtype'
792	      column of the RTP Payload Format media types per [RFC4855] defined
793	      in IANA [IANA].  It is expected that future conferencing
794	      specifications will define corresponding schema extensions, as
795	      appropriate.
796	   o  The <controls> element contains the basic audio and video global
797	      control elements for a conference.  It is expected that for the
798	      majority of the basic conferences, these controls are sufficient.
799	      If the conference server wants to support more advanced controls,
800	      then it is recommended that an extension to the data model be
801	      used.  In the <controls> element the schema is extensible, hence
802	      new control types can be added in the future.  So moderator
803	      controls that affect all media output would go under the
804	      <available-media> element.  The following controls elements are
805	      defined for <controls>:
806	      *  The <mute> element is used in conjunction with an audio stream
807	         to cease transmission of associated media.  That means that for
808	         the entire duration where mute is applicable, all current and
809	         future participants of the conference are muted and will not
810	         receive any audio.  It has a "boolean" value.  If this control
811	         is not specified, access to the control is not available to the
812	         client.
813	      *  The <pause-video> element is used in conjunction with a video
814	         stream to cease transmission of associated media.  It has a
815	         "boolean" value.  If this control is not specified, the access
816	         to the control is not available to the client.
817	      *  The <gain> element is used in conjunction with a media output
818	         stream to indicate the amount of amplification of an audio
819	         stream.  The value is an integer number that ranges from -127
820	         to 127.  If this control is not specified, access to the
821	         control is not available to the client.

823	      *  The <video-layout> element is used in conjunction with a video
824	         stream to specify how the video streams (of participants) are
825	         viewed by each participant.  Only one layout type can be
826	         specified for each output stream.  If there are fewer
827	         participants than panels in the specified layout, then blanking
828	         (black screen) MAY be mixed into the stream on the behalf of
829	         the missing input streams.  If unspecified, the <video-layout>
830	         default type SHOULD be "single-view".  The <video-layout> types
831	         are as follows, although any number of custom layouts may be
832	         specified in future extensions:
833	         +  single-view: Only one stream is presented by the focus to
834	            all participants in one panel.
835	         +  dual-view: This dual view option will present the video
836	            side-by-side in 2 panels and not alter the aspect ratio of
837	            the streams.  This will require the focus to introduce
838	            blanking on parts of the overall image as viewed by the
839	            participants.
840	         +  dual-view-crop: This side-by-side layout option instructs
841	            the focus to alter the aspect ratio of the streams (alter-
842	            aspect-ratio=TRUE) so that blanking is not necessary.  The
843	            focus handles the cropping of the streams.
844	         +  dual-view-2x1: This layout option instructs the focus to
845	            place one stream above the other, in essence with two rows
846	            and one column.  In this option the aspect ratio is not
847	            altered and blanking is introduced.
848	         +  dual-view-2x1-crop: This layout option also instructs the
849	            focus to place one stream above the other, in essence with
850	            two rows and one column.  In this option the aspect ratio is
851	            altered and the video streams are cropped.
852	         +  quad-view: Four equal-sized panels in a 2x2 layout is
853	            presented by the focus to all participants.  Typically the
854	            aspect ratio of the streams are maintained (alter-aspect-
855	            ratio= FALSE).
856	         +  multiple-3x3: Nine equal-sized panels in a 3x3 layout is
857	            presented by the focus to all participants.  Typically the
858	            aspect ratio of the streams are preserved.
859	         +  multiple-4x4: Sixteen equal-sized panels in a 4x4 layout is
860	            presented by the focus to all participants.  Typically the
861	            aspect ratio of the streams are preserved.
862	         +  multiple-5x1: This option refers to a 5x1 layout where one
863	            panel will occupy 4/9 of the mixed video stream while the
864	            others will each occupy 1/9 of the stream.  Typically the
865	            aspect ratio of the streams is preserved.
866	         +  automatic: This option allows the focus to add panels as
867	            streams are added.

869	4.3.  <host-info>

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

878	4.4.  <conference-state>

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

884	4.4.1.  <allow-conference-event-subscription>

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

894	4.4.2.  <user-count>

896	   The <user-count> child element is explained in [RFC4575], section
897	   5.5.1.

899	4.4.3.  <active>

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

903	4.4.4.  <locked>

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

907	4.5.  <floor-information>

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

916	4.5.1.  <conference-ID>

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

926	4.5.2.  <allow-floor-events>

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

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

943	4.5.3.  <floor-request-handling>

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

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

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

963	4.5.4.  <conference-floor-policy>

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

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

996	4.6.  <users>

998	   The <users> element is described in [RFC4575] and contains the <join-
999	   handling>, <user-admission-policy>, <allowed-users-list> and <deny-
1000	   users-list> defined in this document and <user> child elements
1001	   defined in [RFC4575].  Note that the <users> element does not have
1002	   the attribute 'state' defined in [RFC4575] for this element because
1003	   this attribute only applies to notifications mechanism.  The
1004	   following sections describe these elements in more detail.  Other
1005	   child elements and attributes can be used to extend <users> in the
1006	   future.

1008	4.6.1.  <join-handling>

1010	   The <join-handling> element defines the actions used by the
1011	   conference focus to control conference participation.  This element
1012	   defines the action that the focus is to take when processing a
1013	   particular request to join a conference.  This element defines values
1014	   of:
1015	   o  "block": This action instructs the focus to deny access to the
1016	      conference.  This action is the default action taken in the
1017	      absence of any other actions.
1018	   o  "confirm": This action instructs the focus to place the
1019	      participant on a pending list (e.g., by parking the call on a
1020	      music-on-hold server), awaiting moderator input for further
1021	      actions.
1022	   o  "allow": This action instructs the focus to accept the conference
1023	      join request and grant access to the conference within the
1024	      instructions specified in the transformations of this rule.
1025	   o  "authenticate": This action instructs the focus that the user has
1026	      to provide a combination of username/password.
1027	   o  "directed-operator": This action instructs the focus to direct the
1028	      user to an operator.

1030	4.6.2.  <user-admission-policy>

1032	   The <user-admission-policy> is an element that lets an organizer (or
1033	   a participant with appropriate rights) choose a policy for the
1034	   conference that controls how users are authenticated into the
1035	   conference, using a mechanism of the conference's choosing.  Since a
1036	   variety of signaling protocols are possible, a variety of
1037	   authentication mechanism - determined by every individual conference
1038	   servers - may need to be mapped from the different protocols.  The
1039	   specific types of authentication mechanism are beyond the scope of
1040	   this document.  The list of possible values are:

1042	   o  "closedAuthenticated": A 'closedAuthenticated' policy requires
1043	      each conference participant to be in the allowed users list
1044	      (listed under the <allowed-users-list> XML element) with each
1045	      participant being sufficiently (up to local policy) authenticated.
1046	      Conference join requests for users not in the allowed users list
1047	      or participants not authenticated should be rejected unless a
1048	      <join-handling> action of 'confirm' is selected in which case the
1049	      user is placed on a pending list as indicated earlier.
1050	   o  "openAuthenticated": An 'openAuthenticated' policy requires each
1051	      conferencing participant to be sufficiently authenticated (as
1052	      before) but does not restrict which participants can join the
1053	      conference.  Typically this implies that anyone capable of
1054	      authenticating with the conferencing system may join the
1055	      conference.

1057	   o  "anonymous": An 'anonymous' policy allows any join requests in and
1058	      is the least restrictive policy.

1060	4.6.3.  <allowed-users-list>

1062	   The <allowed-users-list> child element contains a list of user URIs
1063	   (e.g.  SIP URI, xcon-userid defined in Section 4.6.5), roles (defined
1064	   in Section 4.6.5.4), or domains (e.g.: *@example.com) that the focus
1065	   uses to determine who can join the conference, who can be invited to
1066	   join a conference, or who the focus needs to "refer to" the
1067	   conference.  The <allowed-users-list> element includes zero or more
1068	   <target> child elements.  This child element includes the mandatory
1069	   'uri' attribute and the mandatory 'method' attribute.  The same 'uri'
1070	   attribute with different method values can appear in the list more
1071	   than once.

1073	   The 'method' attribute is a list with the following values:

1075	   o  "dial-in": The value "dial-in" is used by the focus to determine
1076	      who can join the conference.
1077	   o  "dial-out": The value "dial-out" contains a list of resources that
1078	      the focus will initiate a session with.
1079	   o  "refer": The value "refer" is used by the focus to determine the
1080	      resources that the focus needs to "refer to" the conference.  In
1081	      SIP, this is achieved by the focus sending a REFER request to
1082	      those potential participants.  In a different paradigm, this could
1083	      also mean that the focus sends an SMS or an email to the referred
1084	      user.  This list can be updated during the conference lifetime so
1085	      it can be used for mid-conference refers as well.

1087	   The "refer" value differs from the "dial-out" in that the resources
1088	   on the "refer" value are expected to initiate the session
1089	   establishment toward the focus themselves.  It is also envisioned
1090	   that different users will have different access rights to those lists
1091	   and therefore a separation between the two is needed.

1093	   The <allowed-users-list> element has a <persistent-list> child
1094	   element as well.  Some chatroom systems allow -- and some require --
1095	   registration of detailed information about a user before they are
1096	   allowed to join a chatroom.  The <persistent-list> child element
1097	   stores persistent information about users who are not actively part
1098	   of an ongoing chatroom session.  The <persistent-list> element stores
1099	   the following information:

1101	   o  user: The <user> element stores the name, nickname, the conference
1102	      user identifier (XCON-USERID) and email address of a user.  It has
1103	      three attributes: 'name', 'nickname' and 'id' and an <email>
1104	      element.  Future extensions to this schema may define new elements
1105	      for the <user> element.

1107	   Future extensions to this schema may define new elements for the
1108	   <target> element.

1110	4.6.4.  <deny-users-list>

1112	   The <deny-users-list> child element contains a list of user URIs
1113	   (e.g.  SIP URI, xcon-userid defined in Section 4.6.5), roles (defined
1114	   in Section 4.6.5.4), or domains (e.g.: *@example.com) that the focus
1115	   uses to determine who has been 'banned' from the conference.  Such
1116	   banned users are prevented from re-joining the chatroom until they
1117	   have been un-banned.

1119	4.6.5.  <user> and Its <user> Sub-elements

1121	   The element <user> is described in [RFC4575] and describes a single
1122	   participant in the conference.  The <user> element has an attribute
1123	   'entity'.  Note that the <user> element does not have the attribute
1124	   'state' defined in [RFC4575] for this element because this attribute
1125	   only applies to notifications mechanism.

1127	   The attribute 'entity' contains a unique conference user identifier
1128	   (XCON-USERID) within the scope of the conference.  The URI format of
1129	   this identifier is as follow:

1131	    XCON-USERID = "xcon-userid" ":" conf-user-id

1133	    conf-user-id = 1*(unreserved)

1135	   [unreserved is defined in RFC3986]

1137	   In order to facilitate the comparison of the XCON-USERID identifiers,
1138	   all the components of the identifiers SHOULD be converted to
1139	   lowercase.  After normalizing the URI strings, the URIs comparison
1140	   SHOULD applied a character-by-character basis as prescribed by
1141	   RFC3986, Section 6.2.1.

1143	   Other user identifiers can be associated with this conference user
1144	   identifier and enable the conferencing system to correlate and map
1145	   these multiple authenticated user identities to a single global user
1146	   identifier.  Figure 4 illustrates an example using the conference
1147	   user identifier in association with the user identity defined for
1148	   BFCP, SIP, and H323 user identity.  It should be noted that a
1149	   conferencing system is free to structure such relationships as
1150	   required and this information is just included as a guideline that
1151	   can be used.

1153	                         +----------------+
1154	                         |   Conference   |
1155	                         |      User      |
1156	                         |   Identifier   |
1157	                         +----------------+
1158	                         |xcon-userid:John|
1159	                         +-------+--------+
1160	                                 |
1161	                                 |
1162	                                 |
1163	          +----------------------+-------------------------+
1164	          |                      |                         |
1165	  +-------+--------+ +-----------+-----------+ +-----------+-----------+
1166	  |  BFCP User ID  | |      SIP User URI     | |     H323 User URI     |
1167	  +----------------+ +-----------------------+ +-----------------------+
1168	  |      543       | |sip:851221@example.com | |h323:taeduk@example.com|
1169	  +----------------+ +-----------------------+ +-----------------------+

1171	                     Figure 4: Conference User Mapping

1173	   The element <user> element contains the <display-text>, <associated-
1174	   aors>, <provide-anonymity>, <roles>, <languages>, <cascaded-focus>,
1175	   <allow-refer-users-dynamically>, <allow-invite-users-dynamically>,
1176	   <allow-remove-users-dynamically>, and <endpoint>.  The following
1177	   sections describe these elements in more detail.

1179	4.6.5.1.  <display-text>

1181	   The <display-text> child element is explained in [RFC4575], section
1182	   5.6.1.

1184	4.6.5.2.  <associated-aors>

1186	   The <associated-aors> child element is explained in [RFC4575],
1187	   section 5.6.2.

1189	4.6.5.3.  <provide-anonymity>

1191	   The <provide-anonymity> element specifies what level of anonymity the
1192	   server should provide to the user.  In this case, the focus provides
1193	   to the rest of the participants an anonymous identity for that user,
1194	   for example anonymousX, or it does not provide any information for
1195	   that user such that other users can not see he is a participant in
1196	   the conference.  This element only affects the way the user
1197	   information is provided to the other participants.  The real
1198	   information about the user is still stored in the data model.  This
1199	   can be achieved by using the <provide-anonymity> element.  This
1200	   element has three values: 'private', 'semi-private' and 'hidden'.
1201	   The 'private' value specifies that this user is completely anonymous
1202	   in the conference. 'semi-private' value specifies that this user is
1203	   anonymous to all users with equal or lesser permissions in the
1204	   conference. 'hidden' value specifies that other users can not see
1205	   this participant in the conference.

1207	4.6.5.4.  <roles>

1209	   A role provides the context for the set of conference operations that
1210	   a participant can perform.  This element can contain one of the
1211	   following values: "administrator", "moderator", "user",
1212	   "participant", "observer", and "none".  The roles semantic definition
1213	   is out of the scope of this document and is subject to future policy
1214	   documents.  This element can be extended with new roles in future
1215	   documents.

1217	4.6.5.5.  <languages>

1219	   The <languages> child element is explained in [RFC4575], section
1220	   5.6.4.

1222	4.6.5.6.  <cascaded-focus>

1224	   The <cascaded-focus> child element is explained in [RFC4575], section
1225	   5.6.5.

1227	4.6.5.7.  <allow-refer-users-dynamically>

1229	   The <allow-refer-users-dynamically> element represents a boolean
1230	   value.  If set to TRUE, a participant is allowed to instruct the
1231	   focus to refer a user to the conference without modifying the
1232	   <allowed-users-list> (in SIP terms, a participant is allowed to send
1233	   a REFER request to the focus which results in the focus sending a
1234	   REFER request to the user the referrer wishes to join the
1235	   conference).  If set to FALSE, the refer request is rejected.  If
1236	   this element is undefined it has a value of FALSE, causing the refer
1237	   to be rejected.

1239	4.6.5.8.  <allow-invite-users-dynamically>

1241	   The <allow-invite-users-dynamically> element represents a boolean
1242	   action.  If set to TRUE, a participant is allowed to instruct the
1243	   focus to invite a user to the conference without modifying the
1244	   <allowed-users-list> list (in SIP terms, a participant is allowed to
1245	   send a REFER request to the focus which results in the focus sending
1246	   an INVITE request to the user the referrer wishes to join the
1247	   conference).  If set to FALSE, the refer request is rejected.  If
1248	   this element is undefined it has a value of FALSE, causing the refer
1249	   to be rejected.

1251	4.6.5.9.  <allow-remove-users-dynamically>

1253	   The <allow-remove-users-dynamically> element represents a boolean
1254	   action.  If set to TRUE, a participant is allowed to instruct the
1255	   focus to remove a user from the conference without modifying the
1256	   ruleset (in SIP terms, a participant is allowed to send a REFER
1257	   request to the focus which results in the focus sending an BYE
1258	   request to the user the referrer wishes to leave the conference).  If
1259	   set to FALSE, the refer request is rejected.  If this element is
1260	   undefined it has a value of FALSE, causing the refer to be rejected.

1262	4.6.5.10.  <endpoint>

1264	   The <endpoint> child element is defined in [RFC4575].  It can provide
1265	   the desired level of detail about the user's devices and their
1266	   signaling sessions taking part in the conference.  The <endpoint>
1267	   element in this document does not defined the 'state' attribute
1268	   defined in [RFC4575] for the same element since the 'state' attribute
1269	   only applies to notification mechanisms.

1271	   The <endpoint> element has the following child elements: <display-
1272	   text>, <referred>, <status>, <joining-method>, <joining-info>,
1273	   <disconnection-method>, <disconnection-info>, <media>, <floor>,and
1274	   <call-info>.  All the <endpoint> child elements are defined in
1275	   [RFC4575] with the exception of the <floor> element.

1277	   The <floor> element refers to the floor assigned to a certain
1278	   participant in the conference.  If a participant, for instance, needs
1279	   to talk in the conference, it first needs to get the floor from the
1280	   chair of the conference.  The <floor> element has an attribute 'id'
1281	   which uniquely identifies a floor or floors within a conference.  The
1282	   'id' attribute corresponds to the floor-id identifier defined in
1283	   [RFC4582] section 5.2.2.  The <floor> element has a "Boolean" value.
1284	   A value of FALSE indicates that this user does not hold the floor in
1285	   this moment.  If this control is not specified, this user SHOULD NOT
1286	   specify the floor option.

1288	   Besides the <floor> element, the <endpoint>/<media> element has two
1289	   other child elements defined in this document, the <to-mixer>, and
1290	   the <from-mixer>:

1292	   o  <from-mixer>, <to-mixer>: These are controls that apply to a
1293	      user's media stream being sent from the mixer to the participants
1294	      endpoint or to the mixer from the participants endpoint.  The <to-
1295	      mixer> element details properties associated with the incoming
1296	      streams to the mixer (streams sent to the mixer from the
1297	      participant).  The <from-mixer> element details properties
1298	      associated with the outgoing streams from the mixer (sent from the
1299	      mixer to the participant).  Both of these elements have the
1300	      attribute 'name'.  The 'name' attribute has the values "VideoIn",
1301	      "VideoOut", "AudioOut", and "AudioIn".  The "VideoOut" and
1302	      "AudioOut" media streams detail properties associated with the
1303	      outgoing video and audio from the mixer.  The "VideoIn" and
1304	      "AudioIn" media stream details properties associated with the
1305	      incoming video and audio to the mixer.  More values can be defined
1306	      in the future.  The <to-mixer> and <from-mixer> elements have the
1307	      <controls> child element:
1308	      *  Controls that apply to a specific user would appear under the
1309	         <controls> element.

1311	4.7.  <sidebars-by-ref>

1313	   The <sidebars-by-ref> element contains a set of <entry> child
1314	   elements.  This element is described in [RFC4575], 5.9.1.  Note that
1315	   the <sidebars-by-ref> element does not have the attribute 'state'
1316	   defined in [RFC4575] for this element because this attribute only
1317	   applies to notifications mechanism.

1319	4.8.  <sidebars-by-val>

1321	   The <sidebars-by-val> element contains a set of <entry> child
1322	   elements each containing information about a single sidebar.  This
1323	   element is described in [RFC4575], 5.9.2.  Note that the <sidebars-
1324	   by-val> element does not have the attribute 'state' defined in
1325	   [RFC4575] for this element because this attribute only applies to
1326	   notifications mechanism.

1328	5.  RELAX NG Schema

1330	   In accordance with the Centralized Conferencing Framework document
1331	   [RFC5239], the Conference Object is a logical representation of a
1332	   conference instance.  The conference information schema contains core
1333	   information that is utilized in any conference.  It also contains the
1334	   variable information part of the Conference Object.

1336	   The normative schema is backwards compatible with the [RFC5239], in
1337	   other words, valid [RFC5239] instance documents are also valid
1338	   according to this RELAX NG schema [RELAX].  In addition to
1339	   approximately similar RELAX NG [RELAX] definitions of the [RFC5239],
1340	   this schema contains extension elements in the
1341	   "urn:ietf:params:xml:ns:xcon-conference-info" namespace.

1343	 default namespace = "urn:ietf:params:xml:ns:conference-info"
1344	 namespace xcon = "urn:ietf:params:xml:ns:xcon-conference-info"

1346	 start = element conference-info { conference-type }
1347	 # CONFERENCE TYPE
1348	 conference-type =
1349	   attribute entity { text }
1350	   & anyAttribute
1351	   & conference-description-type?
1352	   & element host-info { host-type }?
1353	   & element conference-state { conference-state-type }?
1354	   & element users { users-type }?
1355	   & element sidebars-by-ref { uris-type }?
1356	   & element sidebars-by-val { sidebars-by-val-type }?
1357	   & element xcon:floor-information { floor-information-type }?
1358	   & anyElement*
1359	 # CONFERENCE DESCRIPTION TYPE
1360	 conference-description-type =
1361	   element conference-description {
1362	     attribute xml:lang { xsd:language }?
1363	     & anyAttribute
1364	     & element display-text { text }?
1365	     & element subject { text }?
1366	     & element free-text { text }?
1367	     & element keywords {
1368	         list { xsd:string* }
1369	       }?
1370	     & element conf-uris { uris-type }?
1371	     & element service-uris { uris-type }?
1372	     & element maximum-user-count { xsd:int }?
1373	     & element available-media { conference-media-type }?
1374	     & element xcon:language { xsd:language }?
1375	     & element xcon:allow-sidebars { xsd:boolean }?
1376	     & element xcon:cloning-parent { xsd:anyURI }?
1377	     & element xcon:sidebar-parent { xsd:anyURI }?
1378	     & element xcon:conference-time { conferencetime-type }?
1379	     & anyElement*
1380	   }
1381	 # HOST TYPE
1382	 host-type =
1383	   element display-text { text }?
1384	   & element web-page { xsd:anyURI }?
1385	   & element uris { uris-type }?
1386	   & anyElement*
1387	   & anyAttribute
1388	 # CONFERENCE STATE TYPE
1389	 conference-state-type =
1390	   anyAttribute
1391	   & element user-count { xsd:unsignedInt }?
1392	   & element active { xsd:boolean }?
1393	   & element locked { xsd:boolean }?
1394	   & element xcon:allow-conference-event-subscription { xsd:boolean }?
1395	   & anyElement*
1396	 # CONFERENCE MEDIA TYPE
1397	 conference-media-type =
1398	   anyAttribute
1399	   & element entry { conference-medium-type }*
1400	   & anyElement*
1401	 # CONFERENCE MEDIUM TYPE
1402	 conference-medium-type =
1403	   attribute label { text }
1404	   & anyAttribute
1405	   & element display-text { text }?
1406	   & element type { text }?
1407	   & element status { media-status-type }?
1408	   & element xcon:mixing-mode { mixing-mode-type }?
1409	   & element xcon:codecs { codecs-type }?
1410	   & element xcon:controls { control-type }?
1411	   & anyElement*
1412	 # URIs TYPE
1413	 uris-type =
1414	   anyAttribute
1415	   & element entry { uri-type }*
1416	   & anyElement*
1417	 # URI TYPE
1418	 uri-type =
1419	   element uri { xsd:anyURI }
1420	   & element display-text { text }?
1421	   & element purpose { text }?
1422	   & element modified { execution-type }?
1423	   & element xcon:conference-password { text }*
1424	   & anyElement*
1425	   & anyAttribute
1426	 # USERS TYPE
1427	 users-type =
1428	   anyAttribute
1429	   & element user { user-type }*
1430	   & element xcon:join-handling { join-handling-type }?
1431	   & element xcon:user-admission-policy { user-admission-policy-type }?
1432	   & element xcon:allowed-users-list { allowed-users-list-type }?
1433	   & element xcon:deny-users-list { deny-user-list-type }?
1434	   & anyElement*
1435	 # USER TYPE
1436	 user-type =
1437	   attribute entity { xsd:anyURI }
1438	   & anyAttribute
1439	   & element display-text { text }?
1440	   & element associated-aors { uris-type }?
1441	   & element roles {
1442	       element entry { single-role-type }+
1443	     }?
1444	   & element languages {
1445	       list { xsd:language }
1446	     }?
1447	   & element cascaded-focus { xsd:anyURI }?
1448	   & element endpoint { endpoint-type }*
1449	   & element xcon:provide-anonymity { provide-anonymity-type }?
1450	   & element xcon:allow-refer-users-dynamically { xsd:boolean }?
1451	   & element xcon:allow-invite-users-dynamically { xsd:boolean }?
1452	   & element xcon:allow-remove-users-dynamically { xsd:boolean }?
1453	   & anyElement*
1454	 # ENDPOINT TYPE
1455	 endpoint-type =
1456	   attribute entity { text }
1457	   & anyAttribute
1458	   & element display-text { text }?
1459	   & element referred { execution-type }?
1460	   & element status { endpoint-status-type }?
1461	   & element joining-method { joining-type }?
1462	   & element joining-info { execution-type }?
1463	   & element disconnection-method { disconnection-type }?
1464	   & element disconnection-info { execution-type }?
1465	   & element media { media-type }*
1466	   & element call-info { call-type }?
1467	   & element xcon:floor {
1468	       attribute id { text },
1469	       anyAttribute,
1470	       xsd:boolean
1471	     }*
1472	   & anyElement*
1473	 # ENDPOINT STATUS TYPE
1474	 endpoint-status-type =
1475	   "pending"
1476	   | "dialing-out"
1477	   | "dialing-in"
1478	   | "alerting"
1479	   | "on-hold"
1480	   | "connected"
1481	   | "muted-via-focus"
1482	   | "disconnecting"
1483	   | "disconnected"
1484	   | free-text-extension
1485	 # JOINING TYPE
1486	 joining-type =
1487	   "dialed-in" | "dialed-out" | "focus-owner" | free-text-extension
1488	 # DISCONNECTION TYPE
1489	 disconnection-type =
1490	   "departed" | "booted" | "failed" | "busy" | free-text-extension
1491	 # EXECUTION TYPE
1492	 execution-type =
1493	   element when { xsd:dateTime }?
1494	   & element reason { text }?
1495	   & element by { xsd:anyURI }?
1496	   & anyAttribute
1497	 # CALL TYPE
1498	 call-type =
1499	   element sip { sip-dialog-id-type }
1500	   & anyElement*
1501	   & anyAttribute
1502	 # SIP DIALOG ID TYPE
1503	 sip-dialog-id-type =
1504	   element display-text { text }?
1505	   & element call-id { text }
1506	   & element from-tag { text }
1507	   & element to-tag { text }
1508	   & anyElement*
1509	   & anyAttribute
1510	 # MEDIA TYPE
1511	 media-type =
1512	   attribute id { xsd:int }
1513	   & anyAttribute
1514	   & element display-text { text }?
1515	   & element type { text }?
1516	   & element label { text }?
1517	   & element src-id { text }?
1518	   & element status { media-status-type }?
1519	   & element xcon:to-mixer { mixer-type }?
1520	   & element xcon:from-mixer { mixer-type }?
1521	   & anyElement*
1522	 # MEDIA STATUS TYPE
1523	 media-status-type =
1524	   "recvonly"
1525	   | "sendonly"
1526	   | "sendrecv"
1527	   | "inactive"
1528	   | free-text-extension
1529	 # SIDEBARS-BY-VAL TYPE
1530	 sidebars-by-val-type =
1531	   anyAttribute
1532	   & element entry { conference-type }*
1533	   & anyElement*
1534	 # CONFERENCE TIME
1535	 conferencetime-type =
1536	   anyAttribute
1537	   & element xcon:entry {
1538	       element xcon:base { text },
1539	       element xcon:mixing-start-offset {
1540	         time-type,
1541	         attribute required-participant { single-role-type },
1542	         anyAttribute
1543	       }?,
1544	       element xcon:mixing-end-offset {
1545	         time-type,
1546	         attribute required-participant { single-role-type },
1547	         anyAttribute
1548	       }?,
1549	       element xcon:can-join-after-offset { time-type }?,
1550	       element xcon:must-join-before-offset { time-type }?,
1551	       element xcon:request-user { time-type }?,
1552	       element xcon:notify-end-of-conference { xsd:int }?,
1553	       element xcon:allowed-extend-mixing-end-offset { xsd:boolean }?,
1554	       anyElement*
1555	     }*
1556	 # TIME TYPE
1557	 time-type = xsd:dateTime { pattern = ".+T.+Z.*" }
1558	 # SINGLE ROLE TYPE
1559	 single-role-type =
1560	   xsd:string "none"
1561	   | xsd:string "administrator"
1562	   | xsd:string "moderator"
1563	   | xsd:string "user"
1564	   | xsd:string "observer"
1565	   | xsd:string "participant"
1566	   | free-text-extension
1567	 # MIXING MODE TYPE
1568	 mixing-mode-type =
1569	   xsd:string "moderator-controlled"
1570	   | xsd:string "FCFS"
1571	   | xsd:string "automatic"
1572	   | free-text-extension
1573	 # CODECS TYPE
1574	 codecs-type =
1575	   attribute decision { decision-type }
1576	   & anyAttribute
1577	   & element xcon:codec { codec-type }*
1578	   & anyElement*
1579	 # CODEC TYPE
1580	 codec-type =
1581	   attribute name { text }
1582	   & attribute policy { policy-type }
1583	   & anyAttribute
1584	   & element xcon:subtype { text }?
1585	   & anyElement*
1586	 # DECISION TYPE
1587	 decision-type =
1588	   xsd:string "automatic"
1589	   | xsd:string "moderator-controlled"
1590	   | free-text-extension
1591	 # POLICY TYPE
1592	 policy-type =
1593	   xsd:string "allowed" | xsd:string "disallowed" | free-text-extension
1594	 # CONTROL TYPE
1595	 control-type =
1596	   anyAttribute
1597	   & element xcon:mute { xsd:boolean }?
1598	   & element xcon:pause-video { xsd:boolean }?
1599	   & element xcon:gain { gain-type }?
1600	   & element xcon:video-layout { video-layout-type }?
1601	   & anyElement*
1602	 # GAIN TYPE
1603	 gain-type = xsd:int { minInclusive = "-127" maxInclusive = "127" }
1604	 # VIDEO LAYOUT TYPE
1605	 video-layout-type =
1606	   xsd:string "single-view"
1607	   | xsd:string "dual-view"
1608	   | xsd:string "dual-view-crop"
1609	   | xsd:string "dual-view-2x1"
1610	   | xsd:string "dual-view-2x1-crop"
1611	   | xsd:string "quad-view"
1612	   | xsd:string "multiple-3x3"
1613	   | xsd:string "multiple-4x4"
1614	   | xsd:string "multiple-5x1"
1615	   | xsd:string "automatic"
1616	   | free-text-extension
1617	 # FLOOR INFORMATION TYPE
1618	 floor-information-type =
1619	   anyAttribute
1620	   & element xcon:conference-ID { xsd:unsignedLong }?
1621	   & element xcon:allow-floor-events { xsd:boolean }?
1622	   & element xcon:floor-request-handling { floor-request-type }?
1623	   & element xcon:conference-floor-policy { conference-floor-policy }?
1624	   & anyElement*
1625	 # FLOOR REQUEST TYPE
1626	 floor-request-type =
1627	   xsd:string "block" | xsd:string "confirm" | free-text-extension
1628	 # CONFERENCE FLOOR POLICY
1629	 conference-floor-policy =
1630	   anyAttribute
1631	   & element xcon:floor {
1632	       attribute id { text }
1633	       & anyAttribute
1634	       & element xcon:media-label { xsd:nonNegativeInteger }+
1635	       & element xcon:algorithm { algorithm-type }?
1636	       & element xcon:max-floor-users { xsd:nonNegativeInteger }?
1637	       & element xcon:moderator-id { xsd:nonNegativeInteger }?
1638	       & anyElement*
1639	     }+
1640	 # ALGORITHM POLICY
1641	 algorithm-type =
1642	   xsd:string "moderator-controlled"
1643	   | xsd:string "FCFS"
1644	   | xsd:string "random"
1645	   | free-text-extension
1646	 # USERS ADMISSION POLICY
1647	 user-admission-policy-type =
1648	   xsd:string "closedAuthenticated"
1649	   | xsd:string "openAuthenticated"
1650	   | xsd:string "anonymous"
1651	   | free-text-extension
1652	 # JOIN HANDLING TYPE
1653	 join-handling-type =
1654	   xsd:string "block"
1655	   | xsd:string "confirm"
1656	   | xsd:string "allow"
1657	   | xsd:string "authenticate"
1658	   | xsd:string "directed-operator"
1659	   | free-text-extension
1660	 # DENY USERLIST
1661	 deny-user-list-type =
1662	   anyAttribute
1663	   & element xcon:target {
1664	       attribute uri { xsd:anyURI },
1665	       anyAttribute
1666	     }*
1667	   & anyElement*
1668	 # ALLOWED USERS LIST TYPE
1669	 allowed-users-list-type =
1670	   anyAttribute
1671	   & element xcon:target { target-type }*
1672	   & element xcon:persistent-list { persistent-list-type }?
1673	   & anyElement*
1674	 # PERSISTENT LIST TYPE
1675	 persistent-list-type =
1676	   element xcon:user {
1677	     attribute name { text }
1678	     & attribute nickname { text }
1679	     & attribute id { text }
1680	     & anyAttribute
1681	     & element xcon:e-mail { text }*
1682	     & anyElement*
1683	   }*
1684	   & anyElement*
1685	 # TARGET TYPE
1686	 target-type =
1687	   attribute uri { xsd:anyURI },
1688	   attribute method { method-type },
1689	   anyAttribute
1690	 # METHOD TYPE
1691	 method-type =
1692	   xsd:string "dial-in"
1693	   | xsd:string "dial-out"
1694	   | xsd:string "refer"
1695	   | free-text-extension
1696	 # ANONYMITY TYPE
1697	 provide-anonymity-type =
1698	   "private" | "semi-private" | "hidden" | free-text-extension
1699	 # MIXER TYPE
1700	 mixer-type =
1701	   attribute name { mixer-name-type }
1702	   & anyAttribute
1703	   & element xcon:controls { control-type }*
1704	   & anyElement*
1705	 # MIXER NAME TYPE
1706	 mixer-name-type =
1707	   "VideoIn" | "VideoOut" | "AudioOut" | "AudioIn" | free-text-extension

1709	 # FREE TEXT EXTENSION
1710	 # (re-define this as <notAllowed>,
1711	 #  if extensions beyond this spec are not used)

1713	 free-text-extension = text

1715	 # *********************************
1716	 # EXTENSIBILITY OF THE SCHEMA
1717	 # *********************************

1719	 # EXTENSIBILITY ELEMENTS
1720	 # (re-define this as <empty/>,
1721	 #  if extensions beyond this spec are not used)

1723	 anyElement =
1724	   element * - (conference-description
1725	                | host-info
1726	                | conference-state
1727	                | users
1728	                | sidebars-by-ref
1729	                | sidebars-by-val
1730	                | display-text
1731	                | subject
1732	                | free-text
1733	                | keywords
1734	                | conf-uris
1735	                | service-uris
1736	                | maximum-user-count
1737	                | available-media
1738	                | web-page
1739	                | uris
1740	                | uri
1741	                | user-count
1742	                | active
1743	                | locked
1744	                | entry
1745	                | type
1746	                | status
1747	                | purpose
1748	                | modified
1749	                | user
1750	                | associated-aors
1751	                | roles
1752	                | languages
1753	                | cascaded-focus
1754	                | endpoint
1755	                | referred
1756	                | joining-method
1757	                | joining-info
1758	                | disconnection-method
1759	                | disconnection-info
1760	                | media
1761	                | call-info
1762	                | when
1763	                | reason
1764	                | by
1765	                | sip
1766	                | call-id
1767	                | from-tag
1768	                | to-tag
1769	                | label
1770	                | src-id
1771	                | xcon:conference-password
1772	                | xcon:mixing-mode
1773	                | xcon:codecs
1774	                | xcon:controls
1775	                | xcon:language
1776	                | xcon:allow-sidebars
1777	                | xcon:cloning-parent
1778	                | xcon:sidebar-parent
1779	                | xcon:allow-conference-event-subscription
1780	                | xcon:to-mixer
1781	                | xcon:provide-anonymity
1782	                | xcon:allow-refer-users-dynamically
1783	                | xcon:allow-invite-users-dynamically
1784	                | xcon:allow-remove-users-dynamically
1785	                | xcon:from-mixer
1786	                | xcon:join-handling
1787	                | xcon:user-admission-policy
1788	                | xcon:allowed-users-list
1789	                | xcon:deny-users-list
1790	                | xcon:floor-information
1791	                | xcon:conference-time
1792	                | xcon:provide-anonymity
1793	                | xcon:floor
1794	                | xcon:entry
1795	                | xcon:mixing-start-offset
1796	                | xcon:mixing-end-offset
1797	                | xcon:can-join-after-offset
1798	                | xcon:must-join-before-offset
1799	                | xcon:request-user
1800	                | xcon:notify-end-of-conference
1801	                | xcon:allowed-extend-mixing-end-offset
1802	                | xcon:codec
1803	                | xcon:subtype
1804	                | xcon:mute
1805	                | xcon:pause-video
1806	                | xcon:gain
1807	                | xcon:video-layout
1808	                | xcon:conference-ID
1809	                | xcon:allow-floor-events
1810	                | xcon:floor-request-handling
1811	                | xcon:conference-floor-policy
1812	                | xcon:media-label
1813	                | xcon:algorithm
1814	                | xcon:max-floor-users
1815	                | xcon:moderator-id
1816	                | xcon:target
1817	                | xcon:persistent-list
1818	                | xcon:e-mail
1819	                | xcon:user) { anyExtension }
1820	 anyExtension =
1821	   (attribute * { text }
1822	    | any)*

1824	 any =
1825	   element * {
1826	     (attribute * { text }
1827	      | text
1828	      | any)*
1829	   }

1831	 # EXTENSIBILITY ATTRIBUTES
1832	 # (re-define this as <empty/>,
1833	 #  if extensions beyond this spec are not used)

1835	 anyAttribute =
1836	   attribute * - (xml:lang
1837	                  | entity
1838	                  | required-participant
1839	                  | label
1840	                  | decision
1841	                  | name
1842	                  | policy
1843	                  | uri
1844	                  | method
1845	                  | id
1846	                  | nickname) { text }*

1848	6.  XML Schema Extensibility

1850	   The Conference Information Data Model defined in this document is
1851	   meant to be extensible toward specific application domains.  Such
1852	   extensions are accomplished by defining elements, child elements and
1853	   attributes that are specific to the desired application domain.  The
1854	   IETF MAY extend the data model schema with unqualified attributes or
1855	   extension elements from the "urn:ietf:params:xml:ns:" "sub-namespace"
1856	   in the future.  Other instances are free to define extension elements
1857	   or attributes under other namespaces.

1859	   Elements or attributes from unknown namespaces MUST be ignored.

1861	7.  XML Example

1863	   The following is an example of a conference information document.
1864	   The conference starts on October 17, 2007, at 10:30 AM in New York
1865	   City and finishes the same day at 12:30 PM every week.  In this
1866	   example, there are currently 3 participants in a conference, one
1867	   administrator, one moderator, and one participant.  Sidebars are
1868	   allowed in this conference and ,consequently, there is one sidebar in
1869	   the conference.  In addition, Alice and Carol are using a floor in
1870	   the main conference to manage the audio and video resources.  At the
1871	   moment, Alice is assigned to use the floor.

1873	<?xml version="1.0" encoding="UTF-8"?>
1874	<conference-info
1875	        xmlns="urn:ietf:params:xml:ns:conference-info"
1876	        xmlns:xcon="urn:ietf:params:xml:ns:xcon-conference-info"
1877	        entity="conference123@example.com">
1878	        <!--
1879	            CONFERENCE DESCRIPTION
1880	        -->
1881	        <conference-description xml:lang="en-us">
1882	            <display-text>Discussion of Formula-1 racing</display-text>
1883	            <subject>Sports:Formula-1</subject>
1884	            <free-text>This is a conference example</free-text>
1885	            <keywords>Formula-1 cars</keywords>
1886	            <!--
1887	                CONFERENCE UNIQUE IDENTIFIERS
1888	            -->
1889	            <conf-uris>
1890	                <entry>
1891	                    <uri>tel:+3585671234</uri>
1892	                    <display-text>Conference Bridge</display-text>
1893	                    <purpose>participation</purpose>
1894	                    <xcon:conference-password
1895	                     >5678</xcon:conference-password>
1896	                </entry>
1897	                <entry>
1898	                    <uri>http://www.example.com/live.ram</uri>
1899	                    <purpose>streaming</purpose>
1900	                </entry>
1901	            </conf-uris>
1902	            <!--
1903	                SERVICE URIS
1904	            -->
1905	            <service-uris>
1906	                <entry>
1907	                    <uri>mailto:bob@example.com</uri>
1908	                    <display-text>email</display-text>
1909	                </entry>
1910	            </service-uris>
1911	            <!--
1912	                MAXIMUM USER COUNT
1913	            -->
1914	            <maximum-user-count>50</maximum-user-count>
1915	            <!--
1916	                AVAILABLE MEDIA
1917	            -->
1918	            <available-media>
1919	                <entry label="10234">
1920	                    <display-text>main audio</display-text>
1921	                    <type>audio</type>
1922	                    <status>sendrecv</status>
1923	                    <xcon:mixing-mode>automatic</xcon:mixing-mode>
1924	                    <xcon:codecs decision="automatic">
1925	                        <xcon:codec name="122" policy="allowed">
1926	                           <xcon:subtype>PCMU</xcon:subtype>
1927	                        </xcon:codec>
1928	                    </xcon:codecs>
1929	                    <xcon:controls>
1930	                        <xcon:mute>true</xcon:mute>
1931	                        <xcon:gain>50</xcon:gain>
1932	                    </xcon:controls>
1933	                </entry>
1934	                <entry label="10235">
1935	                    <display-text>main video</display-text>
1936	                    <type>video</type>
1937	                    <status>sendrecv</status>
1938	                    <xcon:mixing-mode>automatic</xcon:mixing-mode>
1939	                    <xcon:codecs decision="automatic">
1940	                        <xcon:codec name="123" policy="allowed">
1941	                           <xcon:subtype>H.263</xcon:subtype>
1942	                        </xcon:codec>
1943	                    </xcon:codecs>
1944	                    <xcon:controls>
1945	                        <xcon:video-layout
1946	                          >single-view</xcon:video-layout>
1947	                    </xcon:controls>
1948	                </entry>
1949	            </available-media>

1951	            <xcon:language>En-us</xcon:language>

1953	            <xcon:allow-sidebars>true</xcon:allow-sidebars>
1954	            <!--
1955	                CONFERENCE TIME
1956	            -->

1958	            <xcon:conference-time>
1959	                <xcon:entry>
1960	                    <xcon:base>BEGIN:VCALENDAR
1961	  PRODID:-//LlamaSpinner Inc.//NONSGML CamelCall//EN
1962	  VERSION:2.0
1963	  BEGIN:VEVENT
1964	  DTSTAMP:20071003T140728Z
1965	  UID:20071003T140728Z-345FDA-carol@example.com
1966	  ORGANIZER:MAILTO:carol@example.com
1967	  DTSTART:20071017T143000Z
1968	  RRULE:FREQ=WEEKLY
1969	  DTEND:20071217T163000Z
1970	  END:VEVENT
1971	  END:VCALENDAR</xcon:base>
1972	                    <xcon:mixing-start-offset
1973	                        required-participant="moderator"
1974	                       >2007-10-17T14:29:00Z</xcon:mixing-start-offset>
1975	                    <xcon:mixing-end-offset
1976	                        required-participant="participant"
1977	                       >2007-10-17T16:31:00Z</xcon:mixing-end-offset>
1978	                    <xcon:must-join-before-offset
1979	                       >2007-10-17T15:30:00Z
1980	                       </xcon:must-join-before-offset>
1981	                </xcon:entry>
1982	            </xcon:conference-time>

1984	        </conference-description>
1985	        <!--
1986	            HOST INFO
1987	        -->
1988	        <host-info>
1989	            <display-text>Formula1</display-text>
1990	            <web-page>http://www.example.com/formula1/</web-page>
1991	            <uris>
1992	                <entry>
1993	                    <uri>sip:alice@example.com</uri>
1994	                </entry>
1995	                <entry>
1996	                    <uri>sip:carol@example.com</uri>
1997	                </entry>
1998	            </uris>
1999	        </host-info>
2000	        <!--
2001	            CONFERENCE STATE
2002	        -->
2003	        <conference-state>
2004	            <user-count>3</user-count>
2005	            <active>true</active>
2006	            <locked>false</locked>
2007	            <xcon:allow-conference-event-subscription
2008	              >true</xcon:allow-conference-event-subscription>

2010	       </conference-state>
2011	        <!--
2012	            USERS
2013	        -->
2014	        <users>
2015	            <!--
2016	                USER BOB
2017	            -->
2018	            <user entity="bob534">
2019	                <display-text>Bob Hoskins</display-text>
2020	                <associated-aors>
2021	                    <entry>
2022	                        <uri>mailto:bob@example.com</uri>
2023	                        <display-text>email</display-text>
2024	                    </entry>
2025	                </associated-aors>
2026	                <roles>
2027	                    <entry>participant</entry>
2028	                </roles>
2029	                <languages>en-us</languages>

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

2063	                    </media>
2064	                    <!--
2065	                        CALL INFO
2066	                    -->
2067	                    <call-info>
2068	                        <sip>
2069	                            <display-text>full info</display-text>
2070	                            <call-id>hsjh8980vhsb78</call-id>
2071	                            <from-tag>vav738dvbs</from-tag>
2072	                            <to-tag>8954jgjg8432</to-tag>
2073	                        </sip>
2074	                    </call-info>
2075	                </endpoint>
2076	                <xcon:provide-anonymity
2077	                 >semi-private</xcon:provide-anonymity>
2078	                 <xcon:allow-refer-users-dynamically
2079	                    >false</xcon:allow-refer-users-dynamically>
2080	                <xcon:allow-invite-users-dynamically
2081	                    >false</xcon:allow-invite-users-dynamically>
2082	                <xcon:allow-remove-users-dynamically
2083	                    >false</xcon:allow-remove-users-dynamically>
2084	            </user>

2086	            <!--
2087	                USER ALICE
2088	            -->
2089	            <user entity="alice334">
2090	                <display-text>Alice Kay</display-text>
2091	                <associated-aors>
2092	                    <entry>
2093	                        <uri>mailto:alice@example.com</uri>
2094	                        <display-text>email</display-text>
2095	                    </entry>
2096	                </associated-aors>
2097	                <roles>
2098	                    <entry>moderator</entry>
2099	                </roles>
2100	                <languages>en-us</languages>
2101	                <!--
2102	                    ENDPOINTS
2103	                -->
2104	                <endpoint entity="sip:alice@example.com">
2105	                    <display-text>Alice's Desktop</display-text>
2106	                    <status>connected</status>
2107	                    <joining-method>dialed-in</joining-method>
2108	                    <joining-info>
2109	                        <when>2007-10-17T13:35:08Z</when>
2110	                        <reason>invitation</reason>
2111	                        <by>sip:conference@example.com</by>
2112	                    </joining-info>
2113	                    <!--
2114	                        MEDIA
2115	                    -->
2116	                    <media id="1">
2117	                        <type>video</type>
2118	                        <label>10235</label>
2119	                        <src-id>432424</src-id>
2120	                        <status>sendrecv</status>
2121	                        <xcon:to-mixer name="VideoIn">
2122	                         <xcon:controls>
2123	                            <xcon:video-layout
2124	                              >single-view</xcon:video-layout>
2125	                         </xcon:controls>
2126	                        </xcon:to-mixer>
2127	                    </media>
2128	                    <media id="2">
2129	                        <type>audio</type>
2130	                        <label>10234</label>
2131	                        <src-id>532535</src-id>
2132	                        <status>sendrecv</status>
2133	                        <xcon:to-mixer name="AudioIn">
2134	                          <xcon:controls>
2135	                            <xcon:gain>50</xcon:gain>
2136	                          </xcon:controls>
2137	                        </xcon:to-mixer>
2138	                        <xcon:from-mixer name="AudioOut">
2139	                          <xcon:controls>
2140	                              <xcon:gain>50</xcon:gain>
2141	                          </xcon:controls>
2142	                        </xcon:from-mixer>
2143	                    </media>
2144	                    <!--
2145	                        CALL INFO
2146	                    -->
2147	                    <call-info>
2148	                        <sip>
2149	                            <display-text>full info</display-text>
2150	                            <call-id>truy45469123478</call-id>
2151	                            <from-tag>asd456cbgt</from-tag>
2152	                            <to-tag>3456jgjg1234</to-tag>
2153	                        </sip>
2154	                    </call-info>
2155	                    <xcon:floor id="345">true</xcon:floor>
2156	                </endpoint>
2157	                <xcon:provide-anonymity>private</xcon:provide-anonymity>
2158	                <xcon:allow-refer-users-dynamically
2159	                    >true</xcon:allow-refer-users-dynamically>
2160	                <xcon:allow-invite-users-dynamically
2161	                    >true</xcon:allow-invite-users-dynamically>
2162	                <xcon:allow-remove-users-dynamically
2163	                    >true</xcon:allow-remove-users-dynamically>
2164	            </user>

2166	            <!--
2167	                USER CAROL
2168	            -->
2169	            <user entity="carol233">
2170	                <display-text>Carol More</display-text>
2171	                <associated-aors>
2172	                    <entry>
2173	                        <uri>mailto:carol@example.com</uri>
2174	                        <display-text>email</display-text>
2175	                    </entry>
2176	                </associated-aors>
2177	                <roles>
2178	                    <entry>administrator</entry>
2179	                </roles>
2180	                <languages>en-us</languages>
2181	                <!--
2182	                    ENDPOINTS
2183	                -->
2184	                <endpoint entity="sip:carol@example.com">
2185	                    <display-text>Carol's Computer</display-text>
2186	                    <status>connected</status>
2187	                    <joining-method>dialed-in</joining-method>
2188	                    <joining-info>
2189	                        <when>2007-10-17T13:30:05Z</when>
2190	                        <reason>invitation</reason>
2191	                        <by>sip:conference@example.com</by>
2192	                    </joining-info>
2193	                    <!--
2194	                        MEDIA
2195	                    -->
2196	                    <media id="1">
2197	                        <type>video</type>
2198	                        <label>10235</label>
2199	                        <src-id>432424</src-id>
2200	                        <status>sendrecv</status>
2201	                        <xcon:to-mixer name="VideoIn">
2202	                            <xcon:controls>
2203	                                <xcon:video-layout
2204	                              >single-view</xcon:video-layout>
2205	                         </xcon:controls>
2206	                        </xcon:to-mixer>

2208	                    </media>
2209	                    <media id="2">
2210	                        <type>audio</type>
2211	                        <label>10234</label>
2212	                        <src-id>532535</src-id>
2213	                        <status>sendrecv</status>
2214	                        <xcon:to-mixer name="AudioIn">
2215	                            <xcon:controls>
2216	                                <xcon:gain>50</xcon:gain>
2217	                            </xcon:controls>
2218	                        </xcon:to-mixer>
2219	                        <xcon:from-mixer name="AudioOut">
2220	                            <xcon:controls>
2221	                                <xcon:gain>50</xcon:gain>
2222	                          </xcon:controls>
2223	                        </xcon:from-mixer>
2224	                    </media>
2225	                    <!--
2226	                        CALL INFO
2227	                    -->
2228	                    <call-info>
2229	                        <sip>
2230	                            <display-text>full info</display-text>
2231	                            <call-id>wevb12562321894</call-id>
2232	                            <from-tag>asw456wedf</from-tag>
2233	                            <to-tag>2365dfrt3497</to-tag>
2234	                        </sip>
2235	                    </call-info>

2237	                    <xcon:floor id="345">false</xcon:floor>
2238	                </endpoint>

2240	                <xcon:provide-anonymity>private</xcon:provide-anonymity>
2241	                <xcon:allow-refer-users-dynamically
2242	                    >true</xcon:allow-refer-users-dynamically>
2243	                <xcon:allow-invite-users-dynamically
2244	                    >true</xcon:allow-invite-users-dynamically>
2245	                <xcon:allow-remove-users-dynamically
2246	                    >true</xcon:allow-remove-users-dynamically>

2248	            </user>

2250	            <xcon:join-handling>allow</xcon:join-handling>
2251	            <xcon:user-admission-policy
2252	               >openAuthenticated</xcon:user-admission-policy>
2253	            <!--
2254	                ALLOWED USERS LIST
2255	            -->
2256	            <xcon:allowed-users-list>
2257	                <xcon:target uri="sip:bob@example.com"
2258	                    method="dial-out"/>
2259	                <xcon:target uri="sip:alice@example.com"
2260	                    method="dial-out"/>
2261	                <xcon:target uri="sip:carol@example.com"
2262	                    method="dial-out"/>
2263	                <xcon:target uri="sip:john@example.com"
2264	                    method="refer"/>
2265	            </xcon:allowed-users-list>
2266	            <!--
2267	                DENY USERS LIST
2268	            -->
2269	            <xcon:deny-users-list>
2270	                <xcon:target uri="sip:charlie@example.com"/>
2271	            </xcon:deny-users-list>
2272	        </users>
2273	        <!--
2274	            SIDEBARS BY REFERENCE
2275	        -->
2276	        <sidebars-by-ref>
2277	            <entry>
2278	                <uri>conf223</uri>
2279	                <display-text>private with Bob</display-text>
2280	            </entry>
2281	        </sidebars-by-ref>
2282	        <!--
2283	            SIDEBARS BY VALUE
2284	        -->
2285	        <sidebars-by-val>
2286	            <entry entity="conf223">
2287	                <users>
2288	                    <user entity="bob534"/>
2289	                    <user entity="carol233"/>
2290	                </users>
2291	            </entry>
2292	        </sidebars-by-val>
2293	        <!--
2294	            FLOOR INFORMATION
2295	        -->
2296	        <xcon:floor-information>
2297	            <xcon:conference-ID>567</xcon:conference-ID>
2298	            <xcon:allow-floor-events>true</xcon:allow-floor-events>
2299	            <xcon:floor-request-handling
2300	             >confirm</xcon:floor-request-handling>

2302	            <xcon:conference-floor-policy>
2303	                <xcon:floor id="345">
2304	                    <xcon:media-label>10234</xcon:media-label>
2305	                    <xcon:media-label>10235</xcon:media-label>
2306	                    <xcon:algorithm
2307	                     >moderator-controlled</xcon:algorithm>
2308	                    <xcon:max-floor-users>1</xcon:max-floor-users>
2309	                    <xcon:moderator-id>234</xcon:moderator-id>
2310	                </xcon:floor>
2311	            </xcon:conference-floor-policy>
2312	        </xcon:floor-information>

2314	    </conference-info>

2316	   Note that due to RFC formatting conventions, this documents splits
2317	   lines whose content would exceed 72 characters.  Two backslash
2318	   characters mark where line folding has taken place.  These
2319	   backslashes would not appear in the actual XML data model.

2321	8.  Security Considerations

2323	   There are numerous security considerations for this document.  This
2324	   section considers them.

2326	8.1.  Authentication, Access Control, and Integrity

2328	   Different conferencing protocols will support different types of
2329	   authentication mechanisms.  Since a variety of signaling protocols
2330	   are possible, a variety of authentication mechanism - determined by
2331	   every individual conference servers - may need to be mapped from the
2332	   different protocols.  The specific types of authentication mechanism
2333	   are beyond the scope of this document.

2335	   Futhermore, users may use different namespaces to access to a
2336	   conference.  So a mapping database has to specify the acceptable
2337	   range of namespace for a user.  It is RECOMMENDED that the mapping
2338	   database has integrity when it is established, the integrity has to
2339	   be protected, and the database has to be maintained to ensure changes
2340	   in namespaces are accurately reflected.  Doing so, users will not
2341	   access the same conference twice using a different namespace.

2343	   The security considerations for authentication (section 10.1)
2344	   described in the centralized conferencing framework [RFC4575] applies
2345	   to this document.  The focus must ensure that only authorized
2346	   entities are able to manipulate the data to access the information.

2348	8.2.  Confidentiality

2350	   Participants of a conference may not want to reveal some private
2351	   information to other users.  The Conference Information Data Model
2352	   contains sensitive data which should not be analyzed or given to
2353	   anyone.  Examples of potential attacks include eavesdropping or
2354	   illegal copying of sensitive information.  The protocols used for
2355	   manipulation and retrieval of sensitive conference information MUST
2356	   be able to provide confidentiality and integrity mechanism.
2357	   Confidentiality is provided through encryption.  Strong end-to-end
2358	   authentication and encryption can be done using public keys, and end-
2359	   to-end encryption can be done using private keys.  It is RECOMMENDED
2360	   that all the protocols that manipulated the conference information
2361	   data model implement TLS.

2363	9.  IANA Considerations

2365	9.1.  Relax NG Schema Registration

2367	  This specification registers a schema. The schema can be found
2368	  as the sole content of Section 5.

2370	     URI:  urn:ietf:params:xml:ns:xcon-conference-info

2372	     Registrant Contact: IETF XCON working group,
2373	        <xcon@ietf.org>, Oscar Novo
2374	        <Oscar.Novo@ericsson.com>

2376	     Relax NG Schema:  The Relax NG schema to be registered is contained
2377	        in Section 5.  Its first line is

2379	     namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"

2381	        and its last line is

2383	     disconnection-type = "departed" | "booted" | "failed" | "busy"

2385	9.2.  XML Namespace Registration
2386	   This section registers a new XML namespace.

2388	      URI:  urn:ietf:params:xml:ns:xcon-conference-info

2390	      Registrant Contact: IETF XCON working group,
2391	         <xcon@ietf.org>, Oscar Novo
2392	         <Oscar.Novo@ericsson.com>

2394	       XML:

2396	         BEGIN
2397	         <?xml version="1.0"?>
2398	         <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
2399	           "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
2400	         <html xmlns="http://www.w3.org/1999/xhtml">
2401	         <head>
2402	           <meta http-equiv="content-type"
2403	                 content="text/html;charset=iso-8859-1"/>
2404	           <title> Centralized Conferencing Namespace</title>
2405	         </head>
2406	         <body>
2407	           <h1>Namespace for Centralized Conferencing</h1>
2408	           <h2>urn:ietf:params:xml:ns:xcon-conference-info</h2>
2409	         <p>See <a href="[URL of published RFC]">RFCXXXX
2410	             [NOTE TO IANA/RFC-EDITOR:
2411	              Please replace XXXX with the RFC number of this
2412	             specification.]</a>.</p>
2413	         </body>
2414	         </html>
2415	         END

2417	9.3.  Conference Object Identifier Registration

2419	 The IANA is requested to register the following URI scheme
2420	 under the Permanent URI Schemes register.

2422	 XCON-URI = "xcon" ":" [conf-object-id "@"] host [ ":" port ] [RFC xxxx]

2424	  conf-object-id = 1*( unreserved / "+" / "=" / "/" )

2426	   host, port, and unreserved are defined in RFC3986[RFC3986]

2428	   [Note to the RFC Editor: replace xxxx with the number this RFC gets
2429	   assigned.]
2430	    Subject: Request for XCON-URI Registration
2431	    Person & email address to contact for further information:
2432	         Oscar Novo <oscar novo_at_ericsson.com>
2433	    Specification: RFC XXXX
2434	    Author/Change Controller: IESG
2435	    Comments:
2436	        Identifies the Conference

2438	9.4.  Conference User Identifier Registration

2440	   The IANA is requested to register the following URI scheme
2441	    under the Permanent URI Schemes register.

2443	    XCON-USERID = "xcon-userid" ":" conf-user-id  [ RFC xxxx ]

2445	    conf-user-id = 1*(unreserved)

2447	   unreserved is defined in RFC3986[RFC3986]

2449	   [Note to the RFC Editor: replace xxxx with the number this RFC gets
2450	   assigned.]

2452	    Subject: Request for XCON-USERID Registration
2453	    Person & email address to contact for further information:
2454	         Oscar Novo <oscar novo_at_ericsson.com>
2455	    Specification: RFC XXXX
2456	    Author/Change Controller: IESG
2457	    Comments:
2458	        Identifies the User in the conference

2460	10.  Acknowledgements

2462	   This document is really a distillation of many ideas discussed over a
2463	   long period of time.  These ideas were contributed by many different
2464	   drafts in the XCON working group and the SIPPING working group.  We
2465	   would like to thank Orit Levin, Roni Even, Adam Roach, Mary Barnes,
2466	   Chris Boulton, Umesh Chandra, Hisham Khartabil, Petri Koskelainen,
2467	   Aki Niemi, Rohan Mahy, Jonathan Lennox, Sean Duddy, Richard Barnes,
2468	   and Henning Schulzrinne for their comments.  Also, we would like to
2469	   thank Mary Barnes, and Chris Boulton for letting us use the
2470	   conference and user identifier information of their xcon drafts.
2471	   Last but not least, we would like to express our gratitude to all
2472	   those reviewers for their invaluable contribution: Simon Pietro
2473	   Romano, Lorenzo Miniero, Tobia Castaldi, Miguel Garcia, Mary Barnes,
2474	   Srivatsa Srinivasan, Avshalom Houri, Pierre Tane, and Ben Campbell.

2476	11.  References

2478	11.1.  Normative References

2480	   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
2481	              Requirement Levels", BCP 14, RFC 2119, March 1997.

2483	   [RFC4575]  Rosenberg, J., Schulzrinne, H., and O. Levin, "A Session
2484	              Initiation Protocol (SIP) Event Package for Conference
2485	              State", RFC 4575, August 2006.

2487	   [RFC4582]  Camarillo, G., Ott, J., and K. Drage, "The Binary Floor
2488	              Control Protocol (BFCP)", RFC 4582, November 2006.

2490	   [RFC4583]  Camarillo, G., "Session Description Protocol (SDP) Format
2491	              for Binary Floor Control Protocol (BFCP) Streams",
2492	              RFC 4583, November 2006.

2494	   [RFC5239]  Barnes, M., Boulton, C., and O. Levin, "A Framework for
2495	              Centralized Conferencing", RFC 5239, June 2008.

2497	   [RFC5545]  Desruisseaux, B., "Internet Calendaring and Scheduling
2498	              Core Object Specification (iCalendar)", RFC 5545,
2499	              September 2009.

2501	11.2.  Informative References

2503	   [IANA]     "IANA registry for RTP Payload Types"
2504	              "http://www.iana.org/assignments/rtp-parameters".

2506	   [IANA-Lan]
2507	              "IANA Language Subtag Registry"
2508	              "http://www.iana.org/assignments/
2509	              language-subtag-registry".

2511	   [RELAX]    "RELAX NG Home Page" "http://relaxng.org/".

2513	   [RFC3264]  Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model
2514	              with Session Description Protocol (SDP)", RFC 3264,
2515	              June 2002.

2517	   [RFC3265]  Roach, A., "Session Initiation Protocol (SIP)-Specific
2518	              Event Notification", RFC 3265, June 2002.

2520	   [RFC3986]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
2521	              Resource Identifier (URI): Generic Syntax", STD 66,
2522	              RFC 3986, January 2005.

2524	   [RFC4353]  Rosenberg, J., "A Framework for Conferencing with the
2525	              Session Initiation Protocol (SIP)", RFC 4353,
2526	              February 2006.

2528	   [RFC4855]  Casner, S., "Media Type Registration of RTP Payload
2529	              Formats", RFC 4855, February 2007.

2531	   [RFC5018]  Camarillo, G., "Connection Establishment in the Binary
2532	              Floor Control Protocol (BFCP)", RFC 5018, September 2007.

2534	   [RFC5646]  Phillips, A. and M. Davis, "Tags for Identifying
2535	              Languages", BCP 47, RFC 5646, September 2009.

2537	   [W3C.REC-xml-20001006]
2538	              Sperberg-McQueen, C., Maler, E., Paoli, J., and T. Bray,
2539	              "Extensible Markup Language (XML) 1.0 (Second Edition)",
2540	              World Wide Web Consortium FirstEdition REC-xml-20001006,
2541	              October 2000,
2542	              <http://www.w3.org/TR/2000/REC-xml-20001006>.

2544	Appendix A.  Non-Normative RELAX NG Schema in XML Syntax

2546	 <?xml version="1.0" encoding="UTF-8" ?>
2547	    <grammar
2548	           ns="urn:ietf:params:xml:ns:conference-info"
2549	           xmlns="http://relaxng.org/ns/structure/1.0"
2550	           xmlns:xcon="urn:ietf:params:xml:ns:xcon-conference-info"
2551	           datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
2552	           <start>
2553	            <element name="conference-info">
2554	             <ref name="conference-type"/>
2555	            </element>
2556	           </start>
2557	           <!--
2558	               CONFERENCE TYPE
2559	           -->
2560	           <define name="conference-type">
2561	            <interleave>
2562	            <attribute name="entity">
2563	             <text/>
2564	            </attribute>
2565	            <ref name="anyAttribute"/>
2566	            <optional>
2567	             <ref name="conference-description-type"/>
2568	            </optional>
2569	            <optional>
2570	             <element name="host-info">
2571	              <ref name="host-type"/>
2572	             </element>
2573	            </optional>
2574	            <optional>
2575	             <element name="conference-state">
2576	              <ref name="conference-state-type"/>
2577	             </element>
2578	            </optional>
2579	            <optional>
2580	             <element name="users">
2581	              <ref name="users-type"/>
2582	             </element>
2583	            </optional>
2584	            <optional>
2585	             <element name="sidebars-by-ref">
2586	              <ref name="uris-type"/>
2587	             </element>
2588	            </optional>
2589	            <optional>
2590	             <element name="sidebars-by-val">
2591	              <ref name="sidebars-by-val-type"/>
2592	             </element>
2593	            </optional>
2594	            <optional>
2595	             <element name="xcon:floor-information">
2596	              <ref name="floor-information-type"/>
2597	             </element>
2598	            </optional>
2599	            <zeroOrMore>
2600	             <ref name="anyElement"/>
2601	            </zeroOrMore>
2602	            </interleave>
2603	           </define>
2604	           <!--
2605	               CONFERENCE DESCRIPTION TYPE
2606	           -->
2607	           <define name="conference-description-type">
2608	            <element name="conference-description">
2609	             <interleave>
2610	             <optional>
2611	              <attribute name="xml:lang">
2612	               <data type="language"/>
2613	              </attribute>
2614	             </optional>
2615	             <ref name="anyAttribute"/>
2616	             <optional>
2617	              <element name="display-text">
2618	               <text/>
2619	              </element>
2620	             </optional>
2621	             <optional>
2622	              <element name="subject">
2623	               <text/>
2624	              </element>
2625	             </optional>
2626	             <optional>
2627	              <element name="free-text">
2628	               <text/>
2629	              </element>
2630	             </optional>
2631	             <optional>
2632	              <element name="keywords">
2633	               <list>
2634	                <zeroOrMore>
2635	                 <data type="string"/>
2636	                </zeroOrMore>
2637	               </list>
2638	              </element>
2639	             </optional>
2640	             <optional>
2641	              <element name="conf-uris">
2642	               <ref name="uris-type"/>
2643	              </element>
2644	             </optional>
2645	             <optional>
2646	              <element name="service-uris">
2647	                 <ref name="uris-type"/>
2648	              </element>
2649	             </optional>
2650	             <optional>
2651	              <element name="maximum-user-count">
2652	               <data type="int"/>
2653	              </element>
2654	             </optional>
2655	             <optional>
2656	              <element name="available-media">
2657	               <ref name="conference-media-type"/>
2658	              </element>
2659	             </optional>
2660	             <optional>
2661	              <element name="xcon:language">
2662	               <data type="language"/>

2664	              </element>
2665	             </optional>
2666	             <optional>
2667	              <element name="xcon:allow-sidebars">
2668	               <data type="boolean"/>
2669	              </element>
2670	             </optional>
2671	             <optional>
2672	             <element name="xcon:cloning-parent">
2673	              <data type="anyURI"/>
2674	             </element>
2675	             </optional>
2676	             <optional>
2677	             <element name="xcon:sidebar-parent">
2678	              <data type="anyURI"/>
2679	             </element>
2680	             </optional>
2681	             <optional>
2682	              <element name="xcon:conference-time">
2683	               <ref name="conferencetime-type"/>
2684	              </element>
2685	             </optional>
2686	             <zeroOrMore>
2687	              <ref name="anyElement"/>
2688	             </zeroOrMore>
2689	             </interleave>
2690	            </element>
2691	           </define>
2692	           <!--
2693	               HOST TYPE
2694	           -->
2695	           <define name="host-type">
2696	            <interleave>
2697	            <optional>
2698	             <element name="display-text">
2699	              <text/>
2700	             </element>
2701	            </optional>
2702	            <optional>
2703	             <element name="web-page">
2704	              <data type="anyURI"/>
2705	             </element>
2706	            </optional>
2707	            <optional>
2708	             <element name="uris">
2709	              <ref name="uris-type"/>
2710	             </element>
2711	            </optional>
2712	            <zeroOrMore>
2713	             <ref name="anyElement"/>
2714	            </zeroOrMore>
2715	            <ref name="anyAttribute"/>
2716	            </interleave>
2717	           </define>
2718	           <!--
2719	               CONFERENCE STATE TYPE
2720	           -->
2721	           <define name="conference-state-type">
2722	            <interleave>
2723	            <ref name="anyAttribute"/>
2724	            <optional>
2725	             <element name="user-count">
2726	              <data type="unsignedInt"/>
2727	             </element>
2728	            </optional>
2729	            <optional>
2730	             <element name="active">
2731	              <data type="boolean"/>
2732	             </element>
2733	            </optional>
2734	            <optional>
2735	             <element name="locked">
2736	              <data type="boolean"/>
2737	             </element>
2738	            </optional>
2739	            <optional>
2740	             <element name="xcon:allow-conference-event-subscription">
2741	              <data type="boolean"/>
2742	             </element>
2743	            </optional>
2744	            <zeroOrMore>
2745	             <ref name="anyElement"/>
2746	            </zeroOrMore>
2747	            </interleave>
2748	           </define>
2749	           <!--
2750	               CONFERENCE MEDIA TYPE
2751	           -->
2752	           <define name="conference-media-type">
2753	            <interleave>
2754	            <ref name="anyAttribute"/>
2755	            <zeroOrMore>
2756	             <element name="entry">
2757	              <ref name="conference-medium-type"/>
2758	             </element>
2759	            </zeroOrMore>
2760	            <zeroOrMore>
2761	             <ref name="anyElement"/>
2762	            </zeroOrMore>
2763	            </interleave>
2764	           </define>
2765	           <!--
2766	               CONFERENCE MEDIUM TYPE
2767	           -->
2768	           <define name="conference-medium-type">
2769	            <interleave>
2770	            <attribute name="label">
2771	             <text/>
2772	            </attribute>
2773	            <ref name="anyAttribute"/>
2774	            <optional>
2775	             <element name="display-text">
2776	              <text/>
2777	             </element>
2778	            </optional>
2779	            <optional>
2780	             <element name="type">
2781	              <text/>
2782	             </element>
2783	            </optional>
2784	            <optional>
2785	             <element name="status">
2786	              <ref name="media-status-type"/>
2787	             </element>
2788	            </optional>
2789	            <optional>
2790	             <element name="xcon:mixing-mode">
2791	              <ref name="mixing-mode-type"/>
2792	             </element>
2793	            </optional>
2794	            <optional>
2795	             <element name="xcon:codecs">
2796	              <ref name="codecs-type"/>
2797	             </element>
2798	            </optional>
2799	            <optional>
2800	             <element name="xcon:controls">
2801	              <ref name="control-type"/>
2802	             </element>
2803	            </optional>
2804	            <zeroOrMore>
2805	             <ref name="anyElement"/>
2806	            </zeroOrMore>
2807	            </interleave>

2809	           </define>
2810	           <!--
2811	               URIs TYPE
2812	           -->
2813	           <define name="uris-type">
2814	            <interleave>
2815	            <ref name="anyAttribute"/>
2816	            <zeroOrMore>
2817	             <element name="entry">
2818	              <ref name="uri-type"/>
2819	             </element>
2820	            </zeroOrMore>
2821	            <zeroOrMore>
2822	             <ref name="anyElement"/>
2823	            </zeroOrMore>
2824	            </interleave>
2825	           </define>
2826	           <!--
2827	               URI TYPE
2828	           -->
2829	           <define name="uri-type">
2830	            <interleave>
2831	            <element name="uri">
2832	             <data type="anyURI"/>
2833	            </element>
2834	            <optional>
2835	             <element name="display-text">
2836	              <text/>
2837	             </element>
2838	            </optional>
2839	            <optional>
2840	             <element name="purpose">
2841	              <text/>
2842	             </element>
2843	            </optional>
2844	            <optional>
2845	             <element name="modified">
2846	              <ref name="execution-type"/>
2847	             </element>
2848	            </optional>
2849	            <zeroOrMore>
2850	             <element name="xcon:conference-password">
2851	              <text/>
2852	             </element>
2853	            </zeroOrMore>
2854	            <zeroOrMore>
2855	             <ref name="anyElement"/>
2856	            </zeroOrMore>
2857	            <ref name="anyAttribute"/>
2858	           </interleave>

2860	           </define>
2861	           <!--
2862	               USERS TYPE
2863	           -->
2864	           <define name="users-type">
2865	            <interleave>
2866	            <ref name="anyAttribute"/>
2867	            <zeroOrMore>
2868	             <element name="user">
2869	              <ref name="user-type"/>
2870	             </element>
2871	            </zeroOrMore>
2872	            <optional>
2873	             <element name="xcon:join-handling">
2874	              <ref name="join-handling-type"/>
2875	             </element>
2876	            </optional>
2877	            <optional>
2878	             <element name="xcon:user-admission-policy">
2879	              <ref name="user-admission-policy-type"/>
2880	             </element>
2881	            </optional>
2882	            <optional>
2883	             <element name="xcon:allowed-users-list">
2884	              <ref name="allowed-users-list-type"/>
2885	             </element>
2886	            </optional>
2887	            <optional>
2888	             <element name="xcon:deny-users-list">
2889	              <ref name="deny-user-list-type"/>
2890	             </element>
2891	            </optional>
2892	            <zeroOrMore>
2893	             <ref name="anyElement"/>
2894	            </zeroOrMore>
2895	            </interleave>
2896	           </define>
2897	           <!--
2898	               USER TYPE
2899	           -->
2900	           <define name="user-type">
2901	            <interleave>
2902	            <attribute name="entity">
2903	             <data type="anyURI"/>
2904	            </attribute>
2905	            <ref name="anyAttribute"/>
2906	            <optional>
2907	             <element name="display-text">
2908	              <text/>
2909	             </element>
2910	            </optional>
2911	            <optional>
2912	             <element name="associated-aors">
2913	               <ref name="uris-type"/>
2914	             </element>
2915	            </optional>
2916	            <optional>
2917	             <element name="roles">
2918	              <oneOrMore>
2919	               <element name="entry">
2920	                <ref name="single-role-type"/>
2921	               </element>
2922	              </oneOrMore>
2923	             </element>
2924	            </optional>
2925	            <optional>
2926	             <element name="languages">
2927	              <list>
2928	               <data type="language"/>
2929	              </list>
2930	             </element>
2931	            </optional>
2932	            <optional>
2933	             <element name="cascaded-focus">
2934	              <data type="anyURI"/>
2935	             </element>
2936	            </optional>
2937	            <zeroOrMore>
2938	             <element name="endpoint">
2939	              <ref name="endpoint-type"/>
2940	             </element>
2941	            </zeroOrMore>
2942	            <optional>
2943	             <element name="xcon:provide-anonymity">
2944	              <ref name="provide-anonymity-type"/>
2945	             </element>
2946	            </optional>
2947	           <optional>
2948	             <element name="xcon:allow-refer-users-dynamically">
2949	              <data type="boolean"/>
2950	             </element>
2951	            </optional>
2952	            <optional>
2953	             <element name="xcon:allow-invite-users-dynamically">
2954	              <data type="boolean"/>
2955	             </element>
2956	            </optional>
2957	            <optional>
2958	             <element name="xcon:allow-remove-users-dynamically">
2959	              <data type="boolean"/>
2960	             </element>
2961	            </optional>
2962	             <zeroOrMore>
2963	             <ref name="anyElement"/>
2964	            </zeroOrMore>
2965	            </interleave>
2966	           </define>
2967	           <!--
2968	               ENDPOINT TYPE
2969	           -->
2970	           <define name="endpoint-type">
2971	            <interleave>
2972	            <attribute name="entity">
2973	             <text/>
2974	            </attribute>
2975	            <ref name="anyAttribute"/>
2976	            <optional>
2977	             <element name="display-text">
2978	              <text/>
2979	             </element>
2980	            </optional>
2981	            <optional>
2982	             <element name="referred">
2983	               <ref name="execution-type"/>
2984	             </element>
2985	            </optional>
2986	            <optional>
2987	             <element name="status">
2988	              <ref name="endpoint-status-type"/>
2989	             </element>
2990	            </optional>
2991	            <optional>
2992	             <element name="joining-method">
2993	              <ref name="joining-type"/>
2994	             </element>
2995	            </optional>
2996	            <optional>
2997	             <element name="joining-info">
2998	               <ref name="execution-type"/>
2999	             </element>
3000	            </optional>
3001	            <optional>
3002	             <element name="disconnection-method">
3003	              <ref name="disconnection-type"/>
3004	             </element>
3005	            </optional>
3006	            <optional>
3007	             <element name="disconnection-info">
3008	              <ref name="execution-type"/>
3009	             </element>
3010	            </optional>
3011	            <zeroOrMore>
3012	             <element name="media">
3013	              <ref name="media-type"/>
3014	             </element>
3015	            </zeroOrMore>
3016	            <optional>
3017	             <element name="call-info">
3018	              <ref name="call-type"/>
3019	             </element>
3020	            </optional>
3021	            <zeroOrMore>
3022	             <element name="xcon:floor">
3023	              <attribute name="id">
3024	               <text/>
3025	              </attribute>
3026	              <ref name="anyAttribute"/>
3027	              <data type="boolean"/>
3028	             </element>
3029	            </zeroOrMore>
3030	            <zeroOrMore>
3031	             <ref name="anyElement"/>
3032	            </zeroOrMore>
3033	            </interleave>
3034	           </define>
3035	           <!--
3036	               ENDPOINT STATUS TYPE
3037	           -->
3038	           <define name="endpoint-status-type">
3039	            <choice>
3040	             <value>pending</value>
3041	             <value>dialing-out</value>
3042	             <value>dialing-in</value>
3043	             <value>alerting</value>
3044	             <value>on-hold</value>
3045	             <value>connected</value>
3046	             <value>muted-via-focus</value>
3047	             <value>disconnecting</value>
3048	             <value>disconnected</value>
3049	             <ref name="free-text-extension"/>
3050	            </choice>
3051	           </define>
3052	           <!--
3053	               JOINING TYPE
3054	           -->
3055	           <define name="joining-type">
3056	            <choice>
3057	             <value>dialed-in</value>
3058	             <value>dialed-out</value>
3059	             <value>focus-owner</value>
3060	             <ref name="free-text-extension"/>
3061	            </choice>
3062	           </define>
3063	           <!--
3064	               DISCONNECTION TYPE
3065	           -->
3066	           <define name="disconnection-type">
3067	            <choice>
3068	             <value>departed</value>
3069	             <value>booted</value>
3070	             <value>failed</value>
3071	             <value>busy</value>
3072	             <ref name="free-text-extension"/>
3073	            </choice>
3074	           </define>
3075	           <!--
3076	               EXECUTION TYPE
3077	           -->
3078	           <define name="execution-type">
3079	            <interleave>
3080	            <optional>
3081	             <element name="when">
3082	              <data type="dateTime"/>
3083	             </element>
3084	            </optional>
3085	            <optional>
3086	             <element name="reason">
3087	              <text/>
3088	             </element>
3089	            </optional>
3090	            <optional>
3091	             <element name="by">
3092	              <data type="anyURI"/>
3093	             </element>
3094	            </optional>
3095	            <ref name="anyAttribute"/>
3096	            </interleave>

3098	           </define>
3099	           <!--
3100	               CALL TYPE
3101	           -->
3102	           <define name="call-type">
3103	            <interleave>
3104	             <element name="sip">
3105	              <ref name="sip-dialog-id-type"/>
3106	             </element>
3107	             <zeroOrMore>
3108	              <ref name="anyElement"/>
3109	             </zeroOrMore>
3110	             <ref name="anyAttribute"/>
3111	            </interleave>
3112	           </define>
3113	           <!--
3114	               SIP DIALOG ID TYPE
3115	           -->
3116	           <define name="sip-dialog-id-type">
3117	            <interleave>
3118	            <optional>
3119	            <element name="display-text">
3120	             <text/>
3121	            </element>
3122	            </optional>
3123	            <element name="call-id">
3124	             <text/>
3125	            </element>
3126	            <element name="from-tag">
3127	             <text/>
3128	            </element>
3129	            <element name="to-tag">
3130	             <text/>
3131	            </element>
3132	            <zeroOrMore>
3133	             <ref name="anyElement"/>
3134	            </zeroOrMore>
3135	            <ref name="anyAttribute"/>
3136	            </interleave>
3137	           </define>
3138	           <!--
3139	               MEDIA TYPE
3140	           -->
3141	           <define name="media-type">
3142	            <interleave>
3143	            <attribute name="id">
3144	             <data type="int"/>
3145	            </attribute>
3146	            <ref name="anyAttribute"/>
3147	            <optional>
3148	             <element name="display-text">
3149	              <text/>
3150	             </element>
3151	            </optional>
3152	            <optional>
3153	             <element name="type">
3154	              <text/>
3155	             </element>
3156	            </optional>
3157	            <optional>
3158	             <element name="label">
3159	              <text/>
3160	             </element>
3161	            </optional>
3162	            <optional>
3163	             <element name="src-id">
3164	              <text/>
3165	             </element>
3166	            </optional>
3167	            <optional>
3168	             <element name="status">
3169	              <ref name="media-status-type"/>
3170	             </element>
3171	            </optional>
3172	            <optional>
3173	             <element name="xcon:to-mixer">
3174	              <ref name="mixer-type"/>
3175	             </element>
3176	            </optional>
3177	            <optional>
3178	             <element name="xcon:from-mixer">
3179	              <ref name="mixer-type"/>
3180	             </element>
3181	            </optional>
3182	            <zeroOrMore>
3183	             <ref name="anyElement"/>
3184	            </zeroOrMore>
3185	            </interleave>
3186	           </define>
3187	           <!--
3188	               MEDIA STATUS TYPE
3189	           -->
3190	           <define name="media-status-type">
3191	            <choice>
3192	             <value>recvonly</value>
3193	             <value>sendonly</value>
3194	             <value>sendrecv</value>
3195	             <value>inactive</value>
3196	             <ref name="free-text-extension"/>
3197	            </choice>
3198	           </define>
3199	           <!--
3200	               SIDEBARS-BY-VAL TYPE
3201	           -->
3202	           <define name="sidebars-by-val-type">
3203	            <interleave>
3204	            <ref name="anyAttribute"/>
3205	            <zeroOrMore>
3206	             <element name="entry">
3207	              <ref name="conference-type"/>
3208	             </element>
3209	            </zeroOrMore>
3210	            <zeroOrMore>
3211	             <ref name="anyElement"/>
3212	            </zeroOrMore>
3213	            </interleave>
3214	           </define>
3215	           <!--
3216	               CONFERENCE TIME
3217	           -->
3218	           <define name="conferencetime-type">
3219	            <interleave>
3220	            <ref name="anyAttribute"/>
3221	            <zeroOrMore>
3222	             <element name="xcon:entry">
3223	              <element name="xcon:base">
3224	               <text/>
3225	              </element>
3226	              <optional>
3227	               <element name="xcon:mixing-start-offset">
3228	                 <ref name="time-type"/>
3229	                 <attribute name="required-participant">
3230	                  <ref name="single-role-type"/>
3231	                 </attribute>
3232	                <ref name="anyAttribute"/>
3233	               </element>
3234	              </optional>
3235	              <optional>
3236	               <element name="xcon:mixing-end-offset">
3237	                <ref name="time-type"/>
3238	                <attribute name="required-participant">
3239	                 <ref name="single-role-type"/>
3240	                </attribute>
3241	                <ref name="anyAttribute"/>

3243	               </element>
3244	              </optional>
3245	              <optional>
3246	               <element name="xcon:can-join-after-offset">
3247	                <ref name="time-type"/>
3248	               </element>
3249	              </optional>
3250	              <optional>
3251	               <element name="xcon:must-join-before-offset">
3252	                <ref name="time-type"/>
3253	               </element>
3254	              </optional>
3255	              <optional>
3256	               <element name="xcon:request-user">
3257	                <ref name="time-type"/>
3258	               </element>
3259	              </optional>
3260	              <optional>
3261	               <element name="xcon:notify-end-of-conference">
3262	                <data type="int"/>
3263	               </element>
3264	              </optional>
3265	              <optional>
3266	               <element name="xcon:allowed-extend-mixing-end-offset">
3267	                <data type="boolean"/>
3268	               </element>
3269	              </optional>
3270	              <zeroOrMore>
3271	               <ref name="anyElement"/>
3272	              </zeroOrMore>
3273	             </element>
3274	            </zeroOrMore>
3275	            </interleave>
3276	           </define>
3277	           <!--
3278	               TIME TYPE
3279	           -->
3280	           <define name="time-type">
3281	             <data type="dateTime">
3282	               <param name="pattern">.+T.+Z.*</param>
3283	             </data>
3284	           </define>
3285	           <!--
3286	               SINGLE ROLE TYPE
3287	           -->
3288	           <define name="single-role-type">
3289	            <choice>
3290	             <value type="string">none</value>
3291	             <value type="string">administrator</value>
3292	             <value type="string">moderator</value>
3293	             <value type="string">user</value>
3294	             <value type="string">observer</value>
3295	             <value type="string">participant</value>
3296	             <ref name="free-text-extension"/>
3297	            </choice>
3298	           </define>
3299	           <!--
3300	               MIXING MODE TYPE
3301	           -->
3302	           <define name="mixing-mode-type">
3303	            <choice>
3304	             <value type="string">moderator-controlled</value>
3305	             <value type="string">FCFS</value>
3306	             <value type="string">automatic</value>
3307	             <ref name="free-text-extension"/>
3308	            </choice>
3309	           </define>
3310	           <!--
3311	               CODECS TYPE
3312	           -->
3313	           <define name="codecs-type">
3314	            <interleave>
3315	            <attribute name="decision">
3316	             <ref name="decision-type"/>
3317	            </attribute>
3318	            <ref name="anyAttribute"/>
3319	            <zeroOrMore>
3320	             <element name="xcon:codec">
3321	              <ref name="codec-type"/>
3322	             </element>
3323	            </zeroOrMore>
3324	            <zeroOrMore>
3325	             <ref name="anyElement"/>
3326	            </zeroOrMore>
3327	            </interleave>
3328	           </define>
3329	           <!--
3330	               CODEC TYPE
3331	           -->
3332	           <define name="codec-type">
3333	            <interleave>
3334	            <attribute name="name">
3335	             <text/>
3336	            </attribute>
3337	            <attribute name="policy">
3338	             <ref name="policy-type"/>

3340	            </attribute>
3341	            <ref name="anyAttribute"/>
3342	            <optional>
3343	             <element name="xcon:subtype">
3344	              <text/>
3345	             </element>
3346	            </optional>
3347	            <zeroOrMore>
3348	             <ref name="anyElement"/>
3349	            </zeroOrMore>
3350	            </interleave>
3351	           </define>
3352	           <!--
3353	               DECISION TYPE
3354	           -->
3355	           <define name="decision-type">
3356	            <choice>
3357	             <value type="string">automatic</value>
3358	             <value type="string">moderator-controlled</value>
3359	             <ref name="free-text-extension"/>
3360	            </choice>
3361	           </define>
3362	           <!--
3363	               POLICY TYPE
3364	           -->
3365	           <define name="policy-type">
3366	            <choice>
3367	             <value type="string">allowed</value>
3368	             <value type="string">disallowed</value>
3369	             <ref name="free-text-extension"/>
3370	            </choice>
3371	           </define>
3372	           <!--
3373	               CONTROL TYPE
3374	           -->
3375	           <define name="control-type">
3376	            <interleave>
3377	            <ref name="anyAttribute"/>
3378	            <optional>
3379	             <element name="xcon:mute">
3380	              <data type="boolean"/>
3381	             </element>
3382	            </optional>
3383	            <optional>
3384	             <element name="xcon:pause-video">
3385	              <data type="boolean"/>
3386	             </element>
3387	            </optional>
3388	            <optional>
3389	             <element name="xcon:gain">
3390	              <ref name="gain-type"/>
3391	             </element>
3392	            </optional>
3393	            <optional>
3394	             <element name="xcon:video-layout">
3395	              <ref name="video-layout-type"/>
3396	             </element>
3397	            </optional>
3398	            <zeroOrMore>
3399	             <ref name="anyElement"/>
3400	            </zeroOrMore>
3401	            </interleave>
3402	           </define>
3403	           <!--
3404	               GAIN TYPE
3405	           -->
3406	           <define name="gain-type">
3407	             <data type="int">
3408	               <param name="minInclusive">-127</param>
3409	               <param name="maxInclusive">127</param>
3410	             </data>
3411	           </define>
3412	           <!--
3413	               VIDEO LAYOUT TYPE
3414	           -->
3415	           <define name="video-layout-type">
3416	              <choice>
3417	               <value type="string">single-view</value>
3418	               <value type="string">dual-view</value>
3419	               <value type="string">dual-view-crop</value>
3420	               <value type="string">dual-view-2x1</value>
3421	               <value type="string">dual-view-2x1-crop</value>
3422	               <value type="string">quad-view</value>
3423	               <value type="string">multiple-3x3</value>
3424	               <value type="string">multiple-4x4</value>
3425	               <value type="string">multiple-5x1</value>
3426	               <value type="string">automatic</value>
3427	               <ref name="free-text-extension"/>
3428	              </choice>
3429	           </define>
3430	           <!--
3431	               FLOOR INFORMATION TYPE
3432	           -->
3433	           <define name="floor-information-type">
3434	            <interleave>
3435	            <ref name="anyAttribute"/>
3436	            <optional>
3437	             <element name="xcon:conference-ID">
3438	              <data type="unsignedLong"/>
3439	             </element>
3440	            </optional>
3441	            <optional>
3442	             <element name="xcon:allow-floor-events">
3443	              <data type="boolean"/>
3444	             </element>
3445	            </optional>
3446	            <optional>
3447	             <element name="xcon:floor-request-handling">
3448	              <ref name="floor-request-type"/>
3449	             </element>
3450	            </optional>
3451	            <optional>
3452	             <element name="xcon:conference-floor-policy">
3453	              <ref name="conference-floor-policy"/>
3454	             </element>
3455	            </optional>
3456	            <zeroOrMore>
3457	             <ref name="anyElement"/>
3458	            </zeroOrMore>
3459	            </interleave>
3460	           </define>
3461	           <!--
3462	               FLOOR REQUEST TYPE
3463	           -->
3464	           <define name="floor-request-type">
3465	            <choice>
3466	             <value type="string">block</value>
3467	             <value type="string">confirm</value>
3468	             <ref name="free-text-extension"/>
3469	            </choice>
3470	           </define>
3471	           <!--
3472	               CONFERENCE FLOOR POLICY
3473	           -->
3474	           <define name="conference-floor-policy">
3475	            <interleave>
3476	            <ref name="anyAttribute"/>
3477	            <oneOrMore>
3478	             <element name="xcon:floor">
3479	              <interleave>
3480	              <attribute name="id">
3481	               <text/>
3482	              </attribute>
3483	              <ref name="anyAttribute"/>
3484	              <oneOrMore>
3485	               <element name="xcon:media-label">
3486	                <data type="nonNegativeInteger"/>
3487	               </element>
3488	              </oneOrMore>
3489	              <optional>
3490	               <element name="xcon:algorithm">
3491	                <ref name="algorithm-type"/>
3492	               </element>
3493	              </optional>
3494	              <optional>
3495	               <element name="xcon:max-floor-users">
3496	                <data type="nonNegativeInteger"/>
3497	               </element>
3498	              </optional>
3499	              <optional>
3500	               <element name="xcon:moderator-id">
3501	                <data type="nonNegativeInteger"/>
3502	               </element>
3503	              </optional>
3504	              <zeroOrMore>
3505	               <ref name="anyElement"/>
3506	              </zeroOrMore>
3507	              </interleave>
3508	             </element>
3509	            </oneOrMore>
3510	            </interleave>
3511	           </define>
3512	           <!--
3513	               ALGORITHM POLICY
3514	           -->
3515	           <define name="algorithm-type">
3516	            <choice>
3517	             <value type="string">moderator-controlled</value>
3518	             <value type="string">FCFS</value>
3519	             <value type="string">random</value>
3520	             <ref name="free-text-extension"/>
3521	            </choice>
3522	           </define>
3523	           <!--
3524	               USERS ADMISSION POLICY
3525	           -->
3526	           <define name="user-admission-policy-type">
3527	            <choice>
3528	             <value type="string">closedAuthenticated</value>
3529	             <value type="string">openAuthenticated</value>
3530	             <value type="string">anonymous</value>
3531	             <ref name="free-text-extension"/>

3533	            </choice>
3534	           </define>
3535	           <!--
3536	               JOIN HANDLING TYPE
3537	           -->
3538	           <define name="join-handling-type">
3539	            <choice>
3540	             <value type="string">block</value>
3541	             <value type="string">confirm</value>
3542	             <value type="string">allow</value>
3543	             <value type="string">authenticate</value>
3544	             <value type="string">directed-operator</value>
3545	             <ref name="free-text-extension"/>
3546	            </choice>
3547	           </define>
3548	           <!--
3549	               DENY USERLIST
3550	           -->
3551	           <define name="deny-user-list-type">
3552	            <interleave>
3553	            <ref name="anyAttribute"/>
3554	            <zeroOrMore>
3555	             <element name="xcon:target">
3556	              <attribute name="uri">
3557	               <data type="anyURI"/>
3558	              </attribute>
3559	              <ref name="anyAttribute"/>
3560	             </element>
3561	            </zeroOrMore>
3562	            <zeroOrMore>
3563	             <ref name="anyElement"/>
3564	            </zeroOrMore>
3565	            </interleave>
3566	           </define>
3567	           <!--
3568	               ALLOWED USERS LIST TYPE
3569	           -->
3570	           <define name="allowed-users-list-type">
3571	            <interleave>
3572	            <ref name="anyAttribute"/>
3573	            <zeroOrMore>
3574	             <element name="xcon:target">
3575	              <ref name="target-type"/>
3576	             </element>
3577	            </zeroOrMore>
3578	            <optional>
3579	             <element name="xcon:persistent-list">
3580	              <ref name="persistent-list-type"/>

3582	             </element>
3583	            </optional>
3584	            <zeroOrMore>
3585	             <ref name="anyElement"/>
3586	            </zeroOrMore>
3587	            </interleave>
3588	           </define>
3589	           <!--
3590	               PERSISTENT LIST TYPE
3591	           -->
3592	           <define name="persistent-list-type">
3593	            <interleave>
3594	              <zeroOrMore>
3595	               <element name="xcon:user">
3596	                <interleave>
3597	                <attribute name="name">
3598	                 <text/>
3599	                </attribute>
3600	                <attribute name="nickname">
3601	                 <text/>
3602	                </attribute>
3603	                <attribute name="id">
3604	                 <text/>
3605	                </attribute>
3606	                <ref name="anyAttribute"/>
3607	                <zeroOrMore>
3608	                 <element name="xcon:e-mail">
3609	                  <text/>
3610	                 </element>
3611	                </zeroOrMore>
3612	                <zeroOrMore>
3613	                 <ref name="anyElement"/>
3614	                </zeroOrMore>
3615	                </interleave>
3616	               </element>
3617	             </zeroOrMore>
3618	             <zeroOrMore>
3619	              <ref name="anyElement"/>
3620	             </zeroOrMore>
3621	            </interleave>
3622	           </define>
3623	           <!--
3624	               TARGET TYPE
3625	           -->
3626	           <define name="target-type">
3627	            <attribute name="uri">
3628	             <data type="anyURI"/>
3629	            </attribute>
3630	            <attribute name="method">
3631	             <ref name="method-type"/>
3632	            </attribute>
3633	            <ref name="anyAttribute"/>
3634	           </define>
3635	           <!--
3636	               METHOD TYPE
3637	           -->
3638	           <define name="method-type">
3639	            <choice>
3640	             <value type="string">dial-in</value>
3641	             <value type="string">dial-out</value>
3642	             <value type="string">refer</value>
3643	             <ref name="free-text-extension"/>
3644	            </choice>
3645	           </define>
3646	           <!--
3647	               ANONYMITY TYPE
3648	           -->
3649	           <define name="provide-anonymity-type">
3650	              <choice>
3651	               <value>private</value>
3652	               <value>semi-private</value>
3653	               <value>hidden</value>
3654	               <ref name="free-text-extension"/>
3655	              </choice>
3656	           </define>
3657	           <!--
3658	               MIXER TYPE
3659	           -->
3660	           <define name="mixer-type">
3661	            <interleave>
3662	            <attribute name="name">
3663	             <ref name="mixer-name-type"/>
3664	            </attribute>
3665	            <ref name="anyAttribute"/>
3666	            <zeroOrMore>
3667	             <element name="xcon:controls">
3668	              <ref name="control-type"/>
3669	             </element>
3670	            </zeroOrMore>
3671	            <zeroOrMore>
3672	             <ref name="anyElement"/>
3673	            </zeroOrMore>
3674	            </interleave>
3675	           </define>
3676	           <!--
3677	               MIXER NAME TYPE

3679	           -->
3680	           <define name="mixer-name-type">
3681	             <choice>
3682	              <value>VideoIn</value>
3683	              <value>VideoOut</value>
3684	              <value>AudioOut</value>
3685	              <value>AudioIn</value>
3686	              <ref name="free-text-extension"/>
3687	             </choice>
3688	           </define>
3689	           <!--
3690	               FREE TEXT EXTENSION
3691	               (re-define this as <notAllowed>,
3692	                if extensions beyond this spec are not used)
3693	           -->
3694	           <define name="free-text-extension">
3695	            <text/>
3696	           </define>

3698	           <!--
3699	            *********************************
3700	            EXTENSIBILITY OF THE SCHEMA
3701	            *********************************
3702	           -->
3703	           <!--
3704	               EXTENSIBILITY ELEMENTS
3705	               (re-define this as <empty/>,
3706	                if extensions beyond this spec are not used)
3707	           -->
3708	           <define name="anyElement">
3709	            <element>
3710	             <anyName>
3711	              <except>
3712	               <name>conference-description</name>
3713	               <name>host-info</name>
3714	               <name>conference-state</name>
3715	               <name>users</name>
3716	               <name>sidebars-by-ref</name>
3717	               <name>sidebars-by-val</name>
3718	               <name>display-text</name>
3719	               <name>subject</name>
3720	               <name>free-text</name>
3721	               <name>keywords</name>
3722	               <name>conf-uris</name>
3723	               <name>service-uris</name>
3724	               <name>maximum-user-count</name>
3725	               <name>available-media</name>
3726	               <name>web-page</name>
3727	               <name>uris</name>
3728	               <name>uri</name>
3729	               <name>user-count</name>
3730	               <name>active</name>
3731	               <name>locked</name>
3732	               <name>entry</name>
3733	               <name>type</name>
3734	               <name>status</name>
3735	               <name>purpose</name>
3736	               <name>modified</name>
3737	               <name>user</name>
3738	               <name>associated-aors</name>
3739	               <name>roles</name>
3740	               <name>languages</name>
3741	               <name>cascaded-focus</name>
3742	               <name>endpoint</name>
3743	               <name>referred</name>
3744	               <name>joining-method</name>
3745	               <name>joining-info</name>
3746	               <name>disconnection-method</name>
3747	               <name>disconnection-info</name>
3748	               <name>media</name>
3749	               <name>call-info</name>
3750	               <name>when</name>
3751	               <name>reason</name>
3752	               <name>by</name>
3753	               <name>sip</name>
3754	               <name>call-id</name>
3755	               <name>from-tag</name>
3756	               <name>to-tag</name>
3757	               <name>label</name>
3758	               <name>src-id</name>
3759	               <name>xcon:conference-password</name>
3760	               <name>xcon:mixing-mode</name>
3761	               <name>xcon:codecs</name>
3762	               <name>xcon:controls</name>
3763	               <name>xcon:language</name>
3764	               <name>xcon:allow-sidebars</name>
3765	               <name>xcon:cloning-parent</name>
3766	               <name>xcon:sidebar-parent</name>
3767	               <name>xcon:allow-conference-event-subscription</name>
3768	               <name>xcon:to-mixer</name>
3769	               <name>xcon:provide-anonymity</name>
3770	               <name>xcon:allow-refer-users-dynamically</name>
3771	               <name>xcon:allow-invite-users-dynamically</name>
3772	               <name>xcon:allow-remove-users-dynamically</name>
3773	               <name>xcon:from-mixer</name>
3774	               <name>xcon:join-handling</name>
3775	               <name>xcon:user-admission-policy</name>
3776	               <name>xcon:allowed-users-list</name>
3777	               <name>xcon:deny-users-list</name>
3778	               <name>xcon:floor-information</name>
3779	               <name>xcon:conference-time</name>
3780	               <name>xcon:provide-anonymity</name>
3781	               <name>xcon:floor</name>
3782	               <name>xcon:entry</name>
3783	               <name>xcon:mixing-start-offset</name>
3784	               <name>xcon:mixing-end-offset</name>
3785	               <name>xcon:can-join-after-offset</name>
3786	               <name>xcon:must-join-before-offset</name>
3787	               <name>xcon:request-user</name>
3788	               <name>xcon:notify-end-of-conference</name>
3789	               <name>xcon:allowed-extend-mixing-end-offset</name>
3790	               <name>xcon:codec</name>
3791	               <name>xcon:subtype</name>
3792	               <name>xcon:mute</name>
3793	               <name>xcon:pause-video</name>
3794	               <name>xcon:gain</name>
3795	               <name>xcon:video-layout</name>
3796	               <name>xcon:conference-ID</name>
3797	               <name>xcon:allow-floor-events</name>
3798	               <name>xcon:floor-request-handling</name>
3799	               <name>xcon:conference-floor-policy</name>
3800	               <name>xcon:media-label</name>
3801	               <name>xcon:algorithm</name>
3802	               <name>xcon:max-floor-users</name>
3803	               <name>xcon:moderator-id</name>
3804	               <name>xcon:target</name>
3805	               <name>xcon:persistent-list</name>
3806	               <name>xcon:e-mail</name>
3807	               <name>xcon:user</name>
3808	              </except>
3809	             </anyName>
3810	             <ref name="anyExtension"/>
3811	            </element>
3812	           </define>

3814	           <define name="anyExtension">
3815	            <zeroOrMore>
3816	             <choice>
3817	              <attribute>
3818	               <anyName/>
3819	              </attribute>
3820	              <ref name="any"/>
3821	             </choice>
3822	            </zeroOrMore>

3824	           </define>

3826	           <define name="any">
3827	            <element>
3828	             <anyName/>
3829	             <zeroOrMore>
3830	              <choice>
3831	               <attribute>
3832	                <anyName/>
3833	               </attribute>
3834	               <text/>
3835	               <ref name="any"/>
3836	              </choice>
3837	             </zeroOrMore>
3838	           </element>
3839	           </define>

3841	           <!--
3842	               EXTENSIBILITY ATTRIBUTES
3843	               (re-define this as <empty/>,
3844	                if extensions beyond this spec are not used)
3845	           -->

3847	           <define name="anyAttribute">
3848	            <zeroOrMore>
3849	             <attribute>
3850	              <anyName>
3851	               <except>
3852	                <name ns="http://www.w3.org/XML/1998/namespace">lang
3853	                </name>
3854	                <name ns="">entity</name>
3855	                <name ns="">required-participant</name>
3856	                <name ns="">label</name>
3857	                <name ns="">decision</name>
3858	                <name ns="">name</name>
3859	                <name ns="">policy</name>
3860	                <name ns="">uri</name>
3861	                <name ns="">method</name>
3862	                <name ns="">id</name>
3863	                <name ns="">nickname</name>
3864	               </except>
3865	              </anyName>
3866	             </attribute>
3867	            </zeroOrMore>
3868	           </define>
3869	          </grammar>

3871	Appendix B.  Non-Normative W3C XML Schema

3873	   The non-normative W3C XML schema defines extension elements in the
3874	   "urn:ietf:params:xml:ns:xcon-conference-info" namespace.  Note that
3875	   <xs:any> extensions in this schema are stricter than in the normative
3876	   RELAX NG schema [RELAX], and the normative RELAX NG schema [RELAX]
3877	   allows unordered child elements unlike this schema (and the [RFC4575]
3878	   schema).  Also note that this schema allows also otherwise valid
3879	   extension elements to appear in the non-allowed positions.  Likewise
3880	   the cardinalities of these extension elements can not be constrained
3881	   with this schema.

3883	<?xml version="1.0" encoding="UTF-8"?>
3884	  <xs:schema
3885	     xmlns="urn:ietf:params:xml:ns:xcon-conference-info"
3886	     xmlns:info="urn:ietf:params:xml:ns:conference-info"
3887	     xmlns:xs="http://www.w3.org/2001/XMLSchema"
3888	     attributeFormDefault="unqualified" elementFormDefault="qualified"
3889	     targetNamespace="urn:ietf:params:xml:ns:xcon-conference-info">

3891	    <xs:import namespace="urn:ietf:params:xml:ns:conference-info"
3892	      schemaLocation="rfc4575.xsd"/>

3894	    <xs:import namespace="http://www.w3.org/XML/1998/namespace"
3895	      schemaLocation="http://www.w3.org/2001/03/xml.xsd"/>

3897	    <xs:element name="mixing-mode" type="mixing-mode-type"/>
3898	    <xs:element name="codecs" type="codecs-type"/>
3899	    <xs:element name="conference-password" type="xs:string"/>
3900	    <xs:element name="controls" type="controls-type"/>
3901	    <xs:element name="language" type="xs:language"/>
3902	    <xs:element name="allow-sidebars" type="xs:boolean"/>
3903	    <xs:element name="cloning-parent" type="xs:anyURI"/>
3904	    <xs:element name="sidebar-parent" type="xs:anyURI"/>
3905	    <xs:element name="conference-time" type="conference-time-type"/>
3906	    <xs:element name="allow-conference-event-subscription"
3907	      type="xs:boolean"/>
3908	    <xs:element name="to-mixer" type="mixer-type"/>
3909	    <xs:element name="provide-anonymity"
3910	      type="provide-anonymity-type"/>
3911	    <xs:element name="allow-refer-users-dynamically"
3912	      type="xs:boolean"/>
3913	    <xs:element name="allow-invite-users-dynamically"
3914	      type="xs:boolean"/>
3915	    <xs:element name="allow-remove-users-dynamically"
3916	      type="xs:boolean"/>
3917	    <xs:element name="from-mixer" type="mixer-type"/>
3918	    <xs:element name="join-handling" type="join-handling-type"/>
3919	    <xs:element name="user-admission-policy"
3920	      type="user-admission-policy-type"/>
3921	    <xs:element name="allowed-users-list"
3922	      type="allowed-users-list-type"/>
3923	    <xs:element name="deny-users-list" type="deny-users-list-type"/>
3924	    <xs:element name="floor-information" type="floor-information-type"/>

3926	    <!-- CONFERENCE TIME -->

3928	    <xs:complexType name="conference-time-type">
3929	      <xs:sequence>
3930	        <xs:element name="entry"
3931	          minOccurs="0" maxOccurs="unbounded">
3932	          <xs:complexType>
3933	            <xs:sequence>
3934	              <xs:element name="base"
3935	                type="xs:string" minOccurs="1"/>
3936	              <xs:element name="mixing-start-offset" minOccurs="0">
3937	                <xs:complexType>
3938	                  <xs:simpleContent>
3939	                    <xs:extension base="time-type">
3940	                     <xs:attribute name="required-participant"
3941	                       type="role-type" use="required"/>
3942	                      <xs:anyAttribute namespace="##any"
3943	                        processContents="lax"/>
3944	                    </xs:extension>
3945	                  </xs:simpleContent>
3946	                </xs:complexType>
3947	              </xs:element>
3948	              <xs:element name="mixing-end-offset" minOccurs="0">
3949	                <xs:complexType>
3950	                  <xs:simpleContent>
3951	                    <xs:extension base="time-type">
3952	                      <xs:attribute name="required-participant"
3953	                        type="role-type" use="required"/>
3954	                      <xs:anyAttribute namespace="##any"
3955	                        processContents="lax"/>
3956	                    </xs:extension>
3957	                  </xs:simpleContent>
3958	                </xs:complexType>
3959	              </xs:element>
3960	              <xs:element name="can-join-after-offset" type="time-type"
3961	                minOccurs="0"/>
3962	              <xs:element name="must-join-before-offset"
3963	                type="time-type" minOccurs="0"/>
3964	              <xs:element name="request-user" type="time-type"
3965	                minOccurs="0"/>
3966	              <xs:element name="notify-end-of-conference"
3967	                type="xs:integer" minOccurs="0"/>
3968	              <xs:element name="allowed-extend-mixing-end-offset"
3969	                type="xs:boolean" minOccurs="0"/>
3970	              <xs:any namespace="##other" processContents="lax"
3971	                minOccurs="0" maxOccurs="unbounded"/>
3972	            </xs:sequence>
3973	          </xs:complexType>
3974	        </xs:element>
3975	        <xs:any namespace="##other" processContents="lax"
3976	          minOccurs="0" maxOccurs="unbounded"/>
3977	      </xs:sequence>
3978	      <xs:anyAttribute namespace="##any" processContents="lax"/>
3979	    </xs:complexType>

3981	    <!-- TIME TYPE -->

3983	     <xs:simpleType name="time-type">
3984	      <xs:restriction base="xs:dateTime">
3985	        <xs:pattern value=".+T.+Z.*"/>
3986	       </xs:restriction>
3987	     </xs:simpleType>

3989	    <!-- ROLE-TYPE -->

3991	    <xs:simpleType name="role-type">
3992	     <xs:restriction base="xs:string">
3993	      <xs:pattern value="none"/>
3994	      <xs:pattern value="administrator"/>
3995	      <xs:pattern value="moderator"/>
3996	      <xs:pattern value="user"/>
3997	      <xs:pattern value="observer"/>
3998	      <xs:pattern value="participant"/>
3999	      <xs:pattern value=".+"/>
4000	     </xs:restriction>
4001	    </xs:simpleType>

4003	    <!-- MIXING MODE TYPE -->

4005	    <xs:simpleType name="mixing-mode-type">
4006	      <xs:restriction base="xs:string">
4007	        <xs:pattern value="moderator-controlled"/>
4008	        <xs:pattern value="FCFS"/>
4009	        <xs:pattern value="automatic"/>
4010	        <xs:pattern value=".+"/>
4011	      </xs:restriction>
4012	    </xs:simpleType>

4014	    <!-- CODECS TYPE -->
4015	    <xs:complexType name="codecs-type">
4016	      <xs:sequence>
4017	        <xs:element name="codec" type="codec-type"/>
4018	        <xs:any namespace="##other" processContents="lax"
4019	          minOccurs="0" maxOccurs="unbounded"/>
4020	      </xs:sequence>
4021	      <xs:attribute name="decision"
4022	        type="decision-type" use="required"/>
4023	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4024	    </xs:complexType>

4026	    <!-- CODEC TYPE -->

4028	    <xs:complexType name="codec-type">
4029	      <xs:sequence>
4030	        <xs:element name="subtype" type="xs:string" minOccurs="0"/>
4031	        <xs:any namespace="##other" processContents="lax"
4032	          minOccurs="0" maxOccurs="unbounded"/>
4033	      </xs:sequence>
4034	      <xs:attribute name="name"
4035	        type="xs:string" use="required"/>
4036	      <xs:attribute name="policy"
4037	        type="policy-type" use="required"/>
4038	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4039	    </xs:complexType>

4041	    <!-- DECISION TYPE -->

4043	    <xs:simpleType name="decision-type">
4044	      <xs:restriction base="xs:string">
4045	        <xs:pattern value="automatic"/>
4046	        <xs:pattern value="moderator-controlled"/>
4047	        <xs:pattern value=".+"/>
4048	      </xs:restriction>
4049	    </xs:simpleType>

4051	    <!-- POLICY TYPE -->

4053	     <xs:simpleType name="policy-type">
4054	      <xs:restriction base="xs:string">
4055	        <xs:pattern value="allowed"/>
4056	        <xs:pattern value="disallowed"/>
4057	        <xs:pattern value=".+"/>
4058	      </xs:restriction>
4059	     </xs:simpleType>

4061	    <!-- CONTROL TYPE -->
4062	    <xs:complexType name="controls-type">
4063	      <xs:sequence>
4064	        <xs:element name="mute"
4065	          type="xs:boolean" minOccurs="0"/>
4066	        <xs:element name="pause-video"
4067	          type="xs:boolean" minOccurs="0"/>
4068	        <xs:element name="gain"
4069	          type="gain-type" minOccurs="0"/>
4070	        <xs:element name="video-layout"
4071	          type="video-layout-type" default="single-view" minOccurs="0"/>
4072	        <xs:any namespace="##other" processContents="lax"
4073	          minOccurs="0" maxOccurs="unbounded"/>
4074	      </xs:sequence>
4075	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4076	    </xs:complexType>

4078	    <!-- GAIN TYPE -->

4080	    <xs:simpleType name="gain-type">
4081	      <xs:restriction base="xs:integer">
4082	        <xs:minInclusive value="-127"/>
4083	        <xs:maxInclusive value="127"/>
4084	      </xs:restriction>
4085	    </xs:simpleType>

4087	    <!-- VIDEO LAYOUT TYPE -->

4089	    <xs:simpleType name="video-layout-type">
4090	      <xs:restriction base="xs:string">
4091	        <xs:pattern value="single-view"/>
4092	        <xs:pattern value="dual-view"/>
4093	        <xs:pattern value="dual-view-crop"/>
4094	        <xs:pattern value="dual-view-2x1"/>
4095	        <xs:pattern value="dual-view-2x1-crop"/>
4096	        <xs:pattern value="quad-view"/>
4097	        <xs:pattern value="multiple-3x3"/>
4098	        <xs:pattern value="multiple-4x4"/>
4099	        <xs:pattern value="multiple-5x1"/>
4100	        <xs:pattern value="automatic"/>
4101	        <xs:pattern value=".+"/>
4102	      </xs:restriction>
4103	    </xs:simpleType>

4105	    <!-- FLOOR INFORMATION TYPE -->

4107	    <xs:complexType name="floor-information-type">
4108	      <xs:sequence>
4109	        <xs:element name="conference-ID"
4110	          type="xs:unsignedLong" minOccurs="0"/>
4111	        <xs:element name="allow-floor-events"
4112	          type="xs:boolean" default="false" minOccurs="0"/>
4113	        <xs:element name="floor-request-handling"
4114	          type="floor-request-handling-type" minOccurs="0"/>
4115	        <xs:element name="conference-floor-policy"
4116	          type="conference-floor-policy" minOccurs="0"/>
4117	        <xs:any namespace="##other" processContents="lax"
4118	          minOccurs="0" maxOccurs="unbounded"/>
4119	      </xs:sequence>
4120	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4121	    </xs:complexType>

4123	    <!-- FLOOR REQUEST TYPE -->

4125	    <xs:simpleType name="floor-request-handling-type">
4126	      <xs:restriction base="xs:string">
4127	        <xs:pattern value="block"/>
4128	        <xs:pattern value="confirm"/>
4129	        <xs:pattern value=".+"/>
4130	      </xs:restriction>
4131	    </xs:simpleType>

4133	    <!-- CONFERENCE FLOOR POLICY -->

4135	    <xs:complexType name="conference-floor-policy">
4136	      <xs:sequence>
4137	        <xs:element name="floor" maxOccurs="unbounded">
4138	          <xs:complexType>
4139	            <xs:sequence>
4140	              <xs:element name="media-label"
4141	                type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
4142	              <xs:element name="algorithm"
4143	                type="algorithm-type" minOccurs="0"/>
4144	              <xs:element name="max-floor-users"
4145	                type="xs:nonNegativeInteger" minOccurs="0"/>
4146	              <xs:element name="moderator-id"
4147	                type="xs:nonNegativeInteger" minOccurs="0"/>
4148	                <xs:any namespace="##other" processContents="lax"
4149	                  minOccurs="0" maxOccurs="unbounded"/>
4150	            </xs:sequence>
4151	            <xs:attribute name="id" type="xs:string" use="required"/>
4152	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4153	          </xs:complexType>
4154	        </xs:element>
4155	      </xs:sequence>
4156	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4157	    </xs:complexType>
4158	    <!-- ALGORITHM TYPE -->

4160	    <xs:simpleType name="algorithm-type">
4161	      <xs:restriction base="xs:string">
4162	        <xs:pattern value="moderator-controlled"/>
4163	        <xs:pattern value="FCFS"/>
4164	        <xs:pattern value="random"/>
4165	        <xs:pattern value=".+"/>
4166	      </xs:restriction>
4167	    </xs:simpleType>

4169	    <!-- USER ADMISSION POLICY TYPE -->

4171	    <xs:simpleType name="user-admission-policy-type">
4172	      <xs:restriction base="xs:string">
4173	        <xs:pattern value="closedAuthenticated"/>
4174	        <xs:pattern value="openAuthenticated"/>
4175	        <xs:pattern value="anonymous"/>
4176	        <xs:pattern value=".+"/>
4177	      </xs:restriction>
4178	    </xs:simpleType>

4180	    <!-- JOIN HANDLING TYPE -->

4182	    <xs:simpleType name="join-handling-type">
4183	      <xs:restriction base="xs:string">
4184	        <xs:pattern value="block"/>
4185	        <xs:pattern value="confirm"/>
4186	        <xs:pattern value="allow"/>
4187	        <xs:pattern value="authenticate"/>
4188	        <xs:pattern value="directed-operator"/>
4189	        <xs:pattern value=".+"/>
4190	       </xs:restriction>
4191	    </xs:simpleType>

4193	   <!-- DENY USER LIST TYPE -->

4195	    <xs:complexType name="deny-users-list-type">
4196	      <xs:sequence>
4197	        <xs:element name="target" minOccurs="0" maxOccurs="unbounded">
4198	          <xs:complexType>
4199	            <xs:attribute name="uri" use="required" type="xs:anyURI"/>
4200	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4201	          </xs:complexType>
4202	        </xs:element>
4203	        <xs:any namespace="##other" processContents="lax"
4204	          minOccurs="0" maxOccurs="unbounded"/>
4205	      </xs:sequence>
4206	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4207	    </xs:complexType>

4209	     <!-- ALLOWED USERS LIST TYPE -->

4211	    <xs:complexType name="allowed-users-list-type">
4212	      <xs:sequence>
4213	        <xs:element name="target" type="target-type"
4214	          minOccurs="0" maxOccurs="unbounded">
4215	        </xs:element>
4216	        <xs:element name="persistent-list"
4217	          type="persistent-list-type"
4218	          minOccurs="0"/>
4219	        <xs:any namespace="##other" processContents="lax"
4220	          minOccurs="0" maxOccurs="unbounded"/>
4221	      </xs:sequence>
4222	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4223	    </xs:complexType>

4225	    <!-- PERSISTENT LIST TYPE -->

4227	    <xs:complexType name="persistent-list-type">
4228	      <xs:sequence>
4229	        <xs:element name="user" minOccurs="0" maxOccurs="unbounded">
4230	          <xs:complexType>
4231	            <xs:sequence>
4232	              <xs:element name="email" type="xs:string"
4233	                minOccurs="0" maxOccurs="unbounded"/>
4234	              <xs:any namespace="##other" processContents="lax"
4235	                minOccurs="0" maxOccurs="unbounded"/>
4236	            </xs:sequence>
4237	            <xs:attribute name="name"
4238	              use="required" type="xs:anyURI"/>
4239	            <xs:attribute name="nickname"
4240	              use="required" type="xs:string"/>
4241	            <xs:attribute name="id"
4242	              use="required" type="xs:string"/>
4243	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4244	          </xs:complexType>
4245	        </xs:element>
4246	        <xs:any namespace="##other" processContents="lax"
4247	          minOccurs="0" maxOccurs="unbounded"/>
4248	      </xs:sequence>
4249	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4250	    </xs:complexType>

4252	    <!-- TARGET TYPE -->
4253	    <xs:complexType name="target-type">
4254	      <xs:attribute name="uri" use="required"
4255	        type="xs:anyURI"/>
4256	      <xs:attribute name="method" use="required"
4257	        type="method-type"/>
4258	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4259	    </xs:complexType>

4261	    <!-- METHOD TYPE -->

4263	    <xs:simpleType name="method-type">
4264	      <xs:restriction base="xs:string">
4265	        <xs:pattern value="dial-in"/>
4266	        <xs:pattern value="dial-out"/>
4267	        <xs:pattern value="refer"/>
4268	        <xs:pattern value=".+"/>
4269	      </xs:restriction>
4270	    </xs:simpleType>

4272	    <!-- ANONYMITY TYPE -->

4274	    <xs:simpleType name="provide-anonymity-type">
4275	      <xs:restriction base="xs:string">
4276	        <xs:pattern value="private"/>
4277	        <xs:pattern value="semi-private"/>
4278	        <xs:pattern value="hidden"/>
4279	        <xs:pattern value=".+"/>
4280	      </xs:restriction>
4281	    </xs:simpleType>

4283	    <!-- MIXER TYPE -->

4285	    <xs:complexType name="mixer-type">
4286	      <xs:sequence>
4287	        <xs:element name="controls" type="controls-type"
4288	          minOccurs="0" maxOccurs="unbounded"/>
4289	        <xs:any namespace="##other" processContents="lax"
4290	          minOccurs="0" maxOccurs="unbounded"/>
4291	      </xs:sequence>
4292	      <xs:attribute name="name" type="mixer-name-type"
4293	        use="required"/>
4294	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4295	    </xs:complexType>

4297	    <!-- MIXER NAME TYPE -->

4299	    <xs:simpleType name="mixer-name-type">
4300	      <xs:restriction base="xs:string">
4301	        <xs:pattern value="VideoIn"/>
4302	        <xs:pattern value="VideoOut"/>
4303	        <xs:pattern value="AudioOut"/>
4304	        <xs:pattern value="AudioIn"/>
4305	        <xs:pattern value=".+"/>
4306	      </xs:restriction>
4307	    </xs:simpleType>

4309	  </xs:schema>

4311	Authors' Addresses

4313	   Oscar Novo
4314	   Ericsson
4315	   Hirsalantie 11
4316	   Jorvas  02420
4317	   Finland

4319	   Email: Oscar.Novo@ericsson.com

4321	   Gonzalo Camarillo
4322	   Ericsson
4323	   Hirsalantie 11
4324	   Jorvas  02420
4325	   Finland

4327	   Email: Gonzalo.Camarillo@ericsson.com

4329	   David P. Morgan
4330	   Fidelity Investments
4331	   82 Devonshire St, MZ V3C
4332	   Boston, MA  02109-3614
4333	   USA

4335	   Email: Dave.Morgan@fmr.com
4336	   Jari Urpalainen
4337	   Nokia
4338	   Itamerenkatu 11-13
4339	   Helsinki  00180
4340	   Finland

4342	   Phone: +358 7180 37686
4343	   Email: jari.urpalainen@nokia.com