idnits 2.17.1 

draft-ietf-xcon-common-data-model-28.txt:

  Checking boilerplate required by RFC 5378 and the IETF Trust (see
  https://trustee.ietf.org/license-info):
  ----------------------------------------------------------------------------

     No issues found here.

  Checking nits according to https://www.ietf.org/id-info/1id-guidelines.txt:
  ----------------------------------------------------------------------------

     No issues found here.

  Checking nits according to https://www.ietf.org/id-info/checklist :
  ----------------------------------------------------------------------------

     No issues found here.

  Miscellaneous warnings:
  ----------------------------------------------------------------------------

  == The copyright year in the IETF Trust and authors Copyright Line does not
     match the current year

  -- The document seems to contain a disclaimer for pre-RFC5378 work, and may
     have content which was first submitted before 10 November 2008.  The
     disclaimer is necessary when there are original authors that you have
     been unable to contact, or if some do not wish to grant the BCP78 rights
     to the IETF Trust.  If you are able to get all authors (current and
     original) to grant those rights, you can and should remove the
     disclaimer; otherwise, the disclaimer is needed and you can ignore this
     comment. (See the Legal Provisions document at
     https://trustee.ietf.org/license-info for more information.)

  -- The document date (May 27, 2011) is 4711 days in the past.  Is this
     intentional?

  -- Found something which looks like a code comment -- if you have code
     sections in the document, please surround them with '<CODE BEGINS>' and
     '<CODE ENDS>' lines.


  Checking references for intended status: Proposed Standard
  ----------------------------------------------------------------------------

     (See RFCs 3967 and 4897 for information about using normative references
     to lower-maturity documents in RFCs)

  ** Obsolete normative reference: RFC 4582 (Obsoleted by RFC 8855)

  ** Obsolete normative reference: RFC 4583 (Obsoleted by RFC 8856)

  -- Obsolete informational reference (is this intentional?): RFC 3265
     (Obsoleted by RFC 6665)


     Summary: 2 errors (**), 0 flaws (~~), 1 warning (==), 4 comments (--).

     Run idnits with the --verbose option for more detailed information about
     the items above.

--------------------------------------------------------------------------------


2	XCON                                                             O. Novo
3	Internet-Draft                                              G. Camarillo
4	Intended status: Standards Track                                Ericsson
5	Expires: November 28, 2011                                     D. Morgan
6	                                                    Fidelity Investments
7	                                                           J. Urpalainen
8	                                                                   Nokia
9	                                                            May 27, 2011

11	 Conference Information Data Model for Centralized Conferencing (XCON)
12	                draft-ietf-xcon-common-data-model-28.txt

14	Abstract

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

27	Status of this Memo

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

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

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

42	   This Internet-Draft will expire on November 28, 2011.

44	Copyright Notice

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

49	   This document is subject to BCP 78 and the IETF Trust's Legal
50	   Provisions Relating to IETF Documents
51	   (http://trustee.ietf.org/license-info) in effect on the date of
52	   publication of this document.  Please review these documents
53	   carefully, as they describe your rights and restrictions with respect
54	   to this document.  Code Components extracted from this document must
55	   include Simplified BSD License text as described in Section 4.e of
56	   the Trust Legal Provisions and are provided without warranty as
57	   described in the Simplified BSD License.

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

71	Table of Contents

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

144	1.  Introduction

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

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

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

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

184	      ...............................................................
185	      . Conferencing Server                                         .
186	      .       +---------------------------------------------------+ .
187	      .       |       C o n f e r e n c e   o b j e c t           | .
188	      .     +-+--------------------------------------------------+| .
189	      .     |       C o n f e r e n c e   o b j e c t            || .
190	      .   +-+---------------------------------------------------+|| .
191	      .   |       C o n f e r e n c e   o b j e c t             ||| .
192	      .   | +--------------------------------------------------+||| .
193	      .   | | Conference Information Data Model                |||| .
194	      .   | | +----------------------------------------------+ |||| .
195	      .   | | | Conference description  (times, duration)    | |||| .
196	      .   | | +----------------------------------------------+ |||| .
197	      .   | | +----------------------------------------------+ |||| .
198	      .   | | | Host information                             | |||| .
199	      .   | | +----------------------------------------------+ |||| .
200	      .   | | +----------------------------------------------+ |||| .
201	      .   | | | Conference state                             | |||| .
202	      .   | | +----------------------------------------------+ |||| .
203	      .   | | +----------------------------------------------+ |||| .
204	      .   | | | Floor information                            | |||| .
205	      .   | | +----------------------------------------------+ |||| .
206	      .   | | +----------------------------------------------+ |||| .
207	      .   | | | Membership (users, capacity)                 | |||| .
208	      .   | | +----------------------------------------------+ |||| .
209	      .   | | +----------------------------------------------+ |||| .
210	      .   | | | Sidebars, Etc.                               | |||| .
211	      .   | | +----------------------------------------------+ |||| .
212	      .   | | +----------------------------------------------+ |||| .
213	      .   | | | Etc.                                         | |||| .
214	      .   | | +----------------------------------------------+ |||+ .
215	      .   | +--------------------------------------------------+|+  .
216	      .   +----^------------------^-------------^--------|------+   .
217	      .        |                  |             |        |          .
218	      . +------v-------+ +--------v-----+ +-----v-+ +----v-------+  .
219	      . | Conference   | | Floor        | |       | |            |  .
220	      . | Control      | | Control      | |Foci   | |Notification|  .
221	      . | Server       | | Server       | |       | |Service     |  .
222	      . +-----^--------+ +---^----------+ +-^-----+ +------------+  .
223	      ........|..............|..............|..........|.............
224	              |Conference    |Floor         |Call      |Notification
225	              |Control       |Control       |Signaling |Protocol
226	              |Protocol      |Protocol      |Protocol  |
227	      ........v..............v..............v..........v.............
228	      .     C  o  n  f  e  r  e  n  c  i  n  g     C  l i  e  n  t  .
229	      ...............................................................

231	                 Figure 1: Conference Server Architecture

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

244	2.  Terminology

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

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

256	3.  Overview

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

268	3.1.  Data Model Format

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

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

279	3.2.  Data Model Namespace

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

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

287	3.3.  The Conference Object Identifier

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

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

308	                            +--------------------------+
309	                            |       Conference         |
310	                            |         Object           |
311	                            |       Identifier         |
312	                            +--------------------------+
313	                            |  xcon:Ji092i@example.com |
314	                            +------+-------------------+
315	                                        |
316	                                        |
317	                                        |
318	                      +-----------------+---------------+
319	                      |                                 |
320	          +-----------+-----------+          +----------+---------+
321	          |   CSP Conference IDs  |          |BFCP 'Conference ID'|
322	          +-----------------------+          +--------------------+
323	          | h323:i092@example.com |          |        i092        |
324	          | tel:+44(0)2920930033  |          +----------+---------+
325	          | sip:i092@example.com  |                     |
326	          +-----------------------+             +-------+--------+
327	                                                | BFCP 'Floor ID'|
328	                                                +----------------+
329	                                                |      543       |
330	                                                |      236       |
331	                                                +----------------+

333	                    Figure 2: Conference Object Mapping

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

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

359	3.3.1.  Conference Object URI Definition

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

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

365	   host and unreserved are defined in RFC3986[RFC3986]

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

371	3.3.2.  Normalization and Conference Object URI Comparison

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

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

384	3.4.  Data Model Structure

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

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

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

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

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

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

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

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

421	4.  Data Model Definition

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

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

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

603	4.1.  <conference-info>

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

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

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

623	4.2.  <conference-description>

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

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

637	4.2.1.  <language>

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

648	4.2.2.  <display-text>

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

652	4.2.3.  <subject>

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

656	4.2.4.  <free-text>

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

660	4.2.5.  <keywords>

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

664	4.2.6.  <allow-sidebars>

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

671	4.2.7.  <cloning-parent>

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

678	4.2.8.  <sidebar-parent>

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

685	4.2.9.  <conference-time>

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

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

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

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

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

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

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

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

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

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

759	4.2.10.  <conf-uris>

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

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

777	4.2.11.  <service-uris>

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

783	4.2.12.  <maximum-user-count>

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

790	4.2.13.  <available-media>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

918	4.3.  <host-info>

920	   The <host-info> element contains information about the entity hosting
921	   the conference.  This information is usually set before conference
922	   activation, and is rarely changed during the conference lifetime.
923	   The <host-info> element and its child elements are described in

925	   [RFC4575], section 5.4.  Future extensions to the <host-info> element
926	   may define new values.

928	4.4.  <conference-state>

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

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

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

944	4.4.2.  <user-count>

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

949	4.4.3.  <active>

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

953	4.4.4.  <locked>

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

957	4.5.  <floor-information>

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

964	4.5.1.  <conference-ID>

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

974	4.5.2.  <allow-floor-events>

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

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

990	4.5.3.  <floor-request-handling>

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

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

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

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

1011	4.5.4.  <conference-floor-policy>

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

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

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

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

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

1047	4.6.  <users>

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

1059	4.6.1.  <join-handling>

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

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

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

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

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

1085	4.6.2.  <user-admission-policy>

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

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

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

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

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

1137	4.6.3.  <allowed-users-list>

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

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

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

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

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

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

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

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

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

1189	4.6.4.  <deny-users-list>

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

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

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

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

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

1212	    conf-user-id = 1*unreserved

1214	   [unreserved is defined in RFC3986]

1216	   In order to facilitate the comparison of the XCON-USERID identifiers,
1217	   all the components of the identifiers MUST be converted to lowercase.
1218	   After normalizing the URI strings, the URIs comparison MUST applied a
1219	   codepoint-by-codepoint after conversion to a common character
1220	   encoding as prescribed by [RFC3986], Section 6.2.1.

1222	   Other user identifiers can be associated with this conference user
1223	   identifier and enable the conferencing system to correlate and map
1224	   these multiple authenticated user identities to a single global user
1225	   identifier.  Figure 3 illustrates an example using the conference
1226	   user identifier in association with the user identity defined for
1227	   BFCP, SIP, and H323 user identity.  It should be noted that a
1228	   conferencing system is free to structure such relationships as
1229	   required and this information is just included as a guideline.

1231	                         +----------------+
1232	                         |   Conference   |
1233	                         |      User      |
1234	                         |   Identifier   |
1235	                         +----------------+
1236	                         |xcon-userid:John|
1237	                         +-------+--------+
1238	                                 |
1239	                                 |
1240	                                 |
1241	          +----------------------+-------------------------+
1242	          |                      |                         |
1243	  +-------+--------+ +-----------+-----------+ +-----------+-----------+
1244	  |  BFCP User ID  | |      SIP User URI     | |     H323 User URI     |
1245	  +----------------+ +-----------------------+ +-----------------------+
1246	  |      543       | |sip:851221@example.com | |h323:taeduk@example.com|
1247	  +----------------+ +-----------------------+ +-----------------------+

1249	                     Figure 3: Conference User Mapping

1251	   The element <user> element contains the <display-text>, <associated-
1252	   aors>, <provide-anonymity>, <roles>, <languages>, <cascaded-focus>,
1253	   <allow-refer-users-dynamically>, <allow-invite-users-dynamically>,
1254	   <allow-remove-users-dynamically>, and <endpoint>.  The following
1255	   sections describe these elements in more detail.

1257	4.6.5.1.  <display-text>

1259	   The <display-text> child element is explained in [RFC4575], section
1260	   5.6.1.

1262	4.6.5.2.  <associated-aors>

1264	   The <associated-aors> child element is explained in [RFC4575],
1265	   section 5.6.2.

1267	4.6.5.3.  <provide-anonymity>

1269	   The <provide-anonymity> element specifies what level of anonymity the
1270	   server should provide to the user.  In this case, the focus provides
1271	   to the rest of the participants an anonymous identity for that user,
1272	   for example anonymousX, or it does not provide any information for
1273	   that user such that other users can not see he is a participant in
1274	   the conference.  This element only affects the way the user
1275	   information is provided to the other participants.  The real user
1276	   information is stored in the data model but SHOULD NOT be provided to
1277	   the other participants of the conference.  This can be achieved by
1278	   using the <provide-anonymity> element.  This element has three
1279	   values: 'private', 'semi-private' and 'hidden'.  The 'private' value
1280	   specifies that this user is completely anonymous in the conference.
1281	   'semi-private' value specifies that this user is anonymous to all
1282	   users who have not been granted permission to see him. 'hidden' value
1283	   specifies that other users can not see this participant in the
1284	   conference.

1286	4.6.5.4.  <roles>

1288	   A role provides the context for the set of conference operations that
1289	   a participant can perform.  This element can contain one or more of
1290	   the following values: "administrator", "moderator", "user",
1291	   "participant", "observer", and "none".  A role of "none" indicates
1292	   that any role is assigned; The roles semantic definition is out of
1293	   the scope of this document and is subject to future policy documents.
1294	   This element can be extended with new roles in future documents.

1296	4.6.5.5.  <languages>

1298	   The <languages> child element is explained in [RFC4575], section
1299	   5.6.4.

1301	4.6.5.6.  <cascaded-focus>

1303	   The <cascaded-focus> child element is explained in [RFC4575], section
1304	   5.6.5.

1306	4.6.5.7.  <allow-refer-users-dynamically>

1308	   The <allow-refer-users-dynamically> element represents a boolean
1309	   value.  If set to TRUE, a participant is allowed to instruct the
1310	   focus to refer a user to the conference without modifying the
1311	   <allowed-users-list> (in SIP terms, a participant is allowed to send
1312	   a REFER request [RFC3515] to the focus which results in the focus
1313	   sending a REFER request to the user the referrer wishes to join the
1314	   conference).  If set to FALSE, the refer request is rejected.  If
1315	   this element is undefined it has a value of FALSE, causing the refer
1316	   to be rejected.

1318	4.6.5.8.  <allow-invite-users-dynamically>

1320	   The <allow-invite-users-dynamically> element represents a boolean
1321	   action.  If set to TRUE, a participant is allowed to instruct the
1322	   focus to invite a user to the conference without modifying the
1323	   <allowed-users-list> list (in SIP terms, a participant is allowed to
1324	   send a REFER request [RFC3515] to the focus which results in the
1325	   focus sending an INVITE request to the user the referrer wishes to
1326	   join the conference).  If set to FALSE, the refer request is
1327	   rejected.  If this element is undefined it has a value of FALSE,
1328	   causing the refer to be rejected.

1330	4.6.5.9.  <allow-remove-users-dynamically>

1332	   The <allow-remove-users-dynamically> element represents a boolean
1333	   action.  If set to TRUE, a participant is allowed to instruct the
1334	   focus to remove a user from the conference without modifying the
1335	   ruleset (in SIP terms, a participant is allowed to send a REFER
1336	   request [RFC3515] to the focus which results in the focus sending an
1337	   BYE request to the user the referrer wishes to leave the conference).
1338	   If set to FALSE, the refer request is rejected.  If this element is
1339	   undefined it has a value of FALSE, causing the refer to be rejected.

1341	4.6.5.10.  <endpoint>

1343	   The <endpoint> child element is identical to the element with the
1344	   same name in [RFC4575] except that the 'state' attribute is not
1345	   included.  The 'state' attribute only applies to notification
1346	   mechanisms.  The <endpoint> element can provide the desired level of
1347	   detail about the user's devices and their signaling sessions taking
1348	   part in the conference.

1350	   The <endpoint> element has the following child elements: <display-
1351	   text>, <referred>, <status>, <joining-method>, <joining-info>,
1352	   <disconnection-method>, <disconnection-info>, <media>,and <call-
1353	   info>.  All the <endpoint> child elements are defined in [RFC4575]
1354	   with the exception of the <to-mixer> element, and the <from-mixer>
1355	   element.

1357	   The <endpoint>/<media> element has two other child elements defined
1358	   in this document, the <to-mixer>, and the <from-mixer>:

1360	   o  <from-mixer>, <to-mixer>: These are controls that apply to a
1361	      user's media stream being sent from the mixer to the participants
1362	      endpoint or to the mixer from the participants endpoint.  The <to-
1363	      mixer> element details properties associated with the incoming
1364	      streams to the mixer (streams sent to the mixer from the
1365	      participant).  The <from-mixer> element details properties
1366	      associated with the outgoing streams from the mixer (sent from the
1367	      mixer to the participant).  Both of these elements have the
1368	      attribute 'name'.  The 'name' attribute has the values "VideoIn",
1369	      "VideoOut", "AudioOut", and "AudioIn".  The "VideoOut" and
1370	      "AudioOut" media streams detail properties associated with the
1371	      outgoing video and audio from the mixer.  The "VideoIn" and
1372	      "AudioIn" media stream details properties associated with the
1373	      incoming video and audio to the mixer.  Both of these elements can
1374	      have the <floor> child element defined:

1376	      *  The <floor> element refers to the floor assigned to a certain
1377	         participant in the conference.  If a participant, for instance,
1378	         needs to talk in the conference, it first needs to get the
1379	         floor from the chair of the conference.  The <floor> element
1380	         has an attribute 'id' which uniquely identifies a floor within
1381	         a conference.  The 'id' attribute corresponds to the floor-id
1382	         identifier defined in [RFC4582] section 5.2.2.  The <floor>
1383	         element has a "Boolean" value.  A value of FALSE indicates that
1384	         this user does not hold the floor in this moment.  If this
1385	         control is not specified, this user SHOULD NOT specify the
1386	         floor option.

1388	      The <to-mixer> and <from-mixer> elements can have the <controls>
1389	      child element:

1391	      *  Controls that apply to a specific user would appear under the
1392	         <controls> element.

1394	   o  More values can be defined in the future.

1396	4.7.  <sidebars-by-ref>

1398	   The <sidebars-by-ref> element contains a set of <entry> child
1399	   elements.  This element is described in [RFC4575], 5.9.1.  Note that
1400	   the <sidebars-by-ref> element does not have the attribute 'state'
1401	   defined in [RFC4575] for this element because this attribute only
1402	   applies to notifications mechanism.

1404	4.8.  <sidebars-by-val>

1406	   The <sidebars-by-val> element contains a set of <entry> child
1407	   elements each containing information about a single sidebar.  This
1408	   element is described in [RFC4575], 5.9.2.  Note that the <sidebars-
1409	   by-val> element does not have the attribute 'state' defined in
1410	   [RFC4575] for this element because this attribute only applies to
1411	   notifications mechanism.

1413	5.  RELAX NG Schema

1415	   In accordance with the Centralized Conferencing Framework document
1416	   [RFC5239], the Conference Object is a logical representation of a
1417	   conference instance.  The conference information schema contains core
1418	   information that is utilized in any conference.  It also contains the
1419	   variable information part of the Conference Object.

1421	   The normative schema is backwards compatible with [RFC5239], in other
1422	   words, valid [RFC5239] instance documents are also valid according to
1423	   this RELAX NG schema [RELAX].  In addition to approximately similar
1424	   RELAX NG [RELAX] definitions of [RFC5239], this schema contains
1425	   extension elements in the
1426	   "urn:ietf:params:xml:ns:xcon-conference-info" namespace.

1428	default namespace = "urn:ietf:params:xml:ns:conference-info"
1429	namespace xcon = "urn:ietf:params:xml:ns:xcon-conference-info"

1431	start = element conference-info { conference-type }
1432	# CONFERENCE TYPE
1433	conference-type =
1434	  attribute entity { text }
1435	  & anyAttribute
1436	  & conference-description-type?
1437	  & element host-info { host-type }?
1438	  & element conference-state { conference-state-type }?
1439	  & element users { users-type }?
1440	  & element sidebars-by-ref { uris-type }?
1441	  & element sidebars-by-val { sidebars-by-val-type }?
1442	  & element xcon:floor-information { floor-information-type }?
1443	  & anyElement*
1444	# CONFERENCE DESCRIPTION TYPE
1445	conference-description-type =
1446	  element conference-description {
1447	    attribute lang { xsd:language }?
1448	    & anyAttribute
1449	    & element display-text { text }?
1450	    & element subject { text }?
1451	    & element free-text { text }?
1452	    & element keywords {
1453	        list { xsd:string* }
1454	      }?
1455	    & element conf-uris { uris-type }?
1456	    & element service-uris { uris-type }?
1457	    & element maximum-user-count { xsd:int }?
1458	    & element available-media { conference-media-type }?
1459	    & element xcon:language { xsd:language }?
1460	    & element xcon:allow-sidebars { xsd:boolean }?
1461	    & element xcon:cloning-parent { xsd:anyURI }?
1462	    & element xcon:sidebar-parent { xsd:anyURI }?
1463	    & element xcon:conference-time { conferencetime-type }?
1464	    & anyElement*
1465	  }
1466	# HOST TYPE
1467	host-type =
1468	  element display-text { text }?
1469	  & element web-page { xsd:anyURI }?
1470	  & element uris { uris-type }?
1471	  & anyElement*
1472	  & anyAttribute
1473	# CONFERENCE STATE TYPE
1474	conference-state-type =
1475	  anyAttribute
1476	  & element user-count { xsd:unsignedInt }?
1477	  & element active { xsd:boolean }?
1478	  & element locked { xsd:boolean }?
1479	  & element xcon:allow-conference-event-subscription { xsd:boolean }?
1480	  & anyElement*
1481	# CONFERENCE MEDIA TYPE
1482	conference-media-type =
1483	  anyAttribute
1484	  & element entry { conference-medium-type }*
1485	  & anyElement*
1486	# CONFERENCE MEDIUM TYPE
1487	conference-medium-type =
1488	  attribute label { text }
1489	  & anyAttribute
1490	  & element display-text { text }?
1491	  & element type { text }?
1492	  & element status { media-status-type }?
1493	  & element xcon:mixing-mode { mixing-mode-type }?
1494	  & element xcon:codecs { codecs-type }?
1495	  & element xcon:controls { control-type }?
1496	  & anyElement*
1497	# URIs TYPE
1498	uris-type =
1499	  anyAttribute
1500	  & element entry { uri-type }*
1501	  & anyElement*
1502	# URI TYPE
1503	uri-type =
1504	  element uri { xsd:anyURI }
1505	  & element display-text { text }?
1506	  & element purpose { text }?
1507	  & element modified { execution-type }?
1508	  & element xcon:conference-password { text }*
1509	  & anyElement*
1510	  & anyAttribute
1511	# USERS TYPE
1512	users-type =
1513	  anyAttribute
1514	  & element user { user-type }*
1515	  & element xcon:join-handling { join-handling-type }?
1516	  & element xcon:user-admission-policy { user-admission-policy-type }?
1517	  & element xcon:allowed-users-list { allowed-users-list-type }?
1518	  & element xcon:deny-users-list { deny-user-list-type }?
1519	  & anyElement*
1520	# USER TYPE
1521	user-type =
1522	  attribute entity { xsd:anyURI }
1523	  & anyAttribute
1524	  & element display-text { text }?
1525	  & element associated-aors { uris-type }?
1526	  & element roles {
1527	      element entry { single-role-type }+
1528	    }?
1529	  & element languages {
1530	      list { xsd:language }
1531	    }?
1532	  & element cascaded-focus { xsd:anyURI }?
1533	  & element endpoint { endpoint-type }*
1534	  & element xcon:provide-anonymity { provide-anonymity-type }?
1535	  & element xcon:allow-refer-users-dynamically { xsd:boolean }?
1536	  & element xcon:allow-invite-users-dynamically { xsd:boolean }?
1537	  & element xcon:allow-remove-users-dynamically { xsd:boolean }?
1538	  & anyElement*
1539	# ENDPOINT TYPE
1540	endpoint-type =
1541	  attribute entity { text }
1542	  & anyAttribute
1543	  & element display-text { text }?
1544	  & element referred { execution-type }?
1545	  & element status { endpoint-status-type }?
1546	  & element joining-method { joining-type }?
1547	  & element joining-info { execution-type }?
1548	  & element disconnection-method { disconnection-type }?
1549	  & element disconnection-info { execution-type }?
1550	  & element media { media-type }*
1551	  & element call-info { call-type }?
1552	  & anyElement*
1553	# ENDPOINT STATUS TYPE
1554	endpoint-status-type =
1555	  "pending"
1556	  | "dialing-out"
1557	  | "dialing-in"
1558	  | "alerting"
1559	  | "on-hold"
1560	  | "connected"
1561	  | "muted-via-focus"
1562	  | "disconnecting"
1563	  | "disconnected"
1564	  | free-text-extension
1565	# JOINING TYPE
1566	joining-type =
1567	  "dialed-in" | "dialed-out" | "focus-owner" | free-text-extension
1568	# DISCONNECTION TYPE
1569	disconnection-type =
1570	  "departed" | "booted" | "failed" | "busy" | free-text-extension
1571	# EXECUTION TYPE
1572	execution-type =
1573	  element when { xsd:dateTime }?
1574	  & element reason { text }?
1575	  & element by { xsd:anyURI }?
1576	  & anyAttribute
1577	# CALL TYPE
1578	call-type =
1579	  element sip { sip-dialog-id-type }
1580	  & anyElement*
1581	  & anyAttribute
1582	# SIP DIALOG ID TYPE
1583	sip-dialog-id-type =
1584	  element display-text { text }?
1585	  & element call-id { text }
1586	  & element from-tag { text }
1587	  & element to-tag { text }
1588	  & anyElement*
1589	  & anyAttribute
1590	# MEDIA TYPE
1591	media-type =
1592	  attribute id { xsd:int }
1593	  & anyAttribute
1594	  & element display-text { text }?
1595	  & element type { text }?
1596	  & element label { text }?
1597	  & element src-id { text }?
1598	  & element status { media-status-type }?
1599	  & element xcon:to-mixer { mixer-type }?
1600	  & element xcon:from-mixer { mixer-type }?
1601	  & anyElement*
1602	# MEDIA STATUS TYPE
1603	media-status-type =
1604	  "recvonly"
1605	  | "sendonly"
1606	  | "sendrecv"
1607	  | "inactive"
1608	  | free-text-extension
1609	# SIDEBARS-BY-VAL TYPE
1610	sidebars-by-val-type =
1611	  anyAttribute
1612	  & element entry { conference-type }*
1613	  & anyElement*
1614	# CONFERENCE TIME
1615	conferencetime-type =
1616	  anyAttribute
1617	  & element xcon:entry {
1618	      element xcon:base { text },
1619	      element xcon:mixing-start-offset {
1620	        time-type,
1621	        attribute required-participant { single-role-type },
1622	        anyAttribute
1623	      }?,
1624	      element xcon:mixing-end-offset {
1625	        time-type,
1626	        attribute required-participant { single-role-type },
1627	        anyAttribute
1628	      }?,
1629	      element xcon:can-join-after-offset { time-type }?,
1630	      element xcon:must-join-before-offset { time-type }?,
1631	      element xcon:request-user { time-type }?,
1632	      element xcon:notify-end-of-conference { xsd:nonNegativeInteger }?,
1633	      element xcon:allowed-extend-mixing-end-offset { xsd:boolean }?,
1634	      anyElement*
1635	    }*
1636	# TIME TYPE
1637	time-type = xsd:dateTime { pattern = ".+T.+Z.*" }
1638	# SINGLE ROLE TYPE
1639	single-role-type =
1640	  xsd:string "none"
1641	  | xsd:string "administrator"
1642	  | xsd:string "moderator"
1643	  | xsd:string "user"
1644	  | xsd:string "observer"
1645	  | xsd:string "participant"
1646	  | free-text-extension
1647	# MIXING MODE TYPE
1648	mixing-mode-type =
1649	  xsd:string "moderator-controlled"
1650	  | xsd:string "FCFS"
1651	  | xsd:string "automatic"
1652	  | free-text-extension
1653	# CODECS TYPE
1654	codecs-type =
1655	  attribute decision { decision-type }
1656	  & anyAttribute
1657	  & element xcon:codec { codec-type }*
1658	  & anyElement*
1659	# CODEC TYPE
1660	codec-type =
1661	  attribute name { text }
1662	  & attribute policy { policy-type }
1663	  & anyAttribute
1664	  & element xcon:subtype { text }?
1665	  & anyElement*
1666	# DECISION TYPE
1667	decision-type =
1668	  xsd:string "automatic"
1669	  | xsd:string "moderator-controlled"
1670	  | free-text-extension
1671	# POLICY TYPE
1672	policy-type =
1673	  xsd:string "allowed" | xsd:string "disallowed" | free-text-extension
1674	# CONTROL TYPE
1675	control-type =
1676	  anyAttribute
1677	  & element xcon:mute { xsd:boolean }?
1678	  & element xcon:pause-video { xsd:boolean }?
1679	  & element xcon:gain { gain-type }?
1680	  & element xcon:video-layout { video-layout-type }?
1681	  & anyElement*
1682	# GAIN TYPE
1683	gain-type = xsd:int { minInclusive = "-127" maxInclusive = "127" }
1684	# VIDEO LAYOUT TYPE
1685	video-layout-type =
1686	  xsd:string "single-view"
1687	  | xsd:string "dual-view"
1688	  | xsd:string "dual-view-crop"
1689	  | xsd:string "dual-view-2x1"
1690	  | xsd:string "dual-view-2x1-crop"
1691	  | xsd:string "quad-view"
1692	  | xsd:string "multiple-3x3"
1693	  | xsd:string "multiple-4x4"
1694	  | xsd:string "multiple-5x1"
1695	  | xsd:string "automatic"
1696	  | free-text-extension
1697	# FLOOR INFORMATION TYPE
1698	floor-information-type =
1699	  anyAttribute
1700	  & element xcon:conference-ID { xsd:unsignedLong }?
1701	  & element xcon:allow-floor-events { xsd:boolean }?
1702	  & element xcon:floor-request-handling { floor-request-type }?
1703	  & element xcon:conference-floor-policy { conference-floor-policy }?
1704	  & anyElement*
1705	# FLOOR REQUEST TYPE
1706	floor-request-type =
1707	  xsd:string "block" | xsd:string "confirm" | free-text-extension
1708	# CONFERENCE FLOOR POLICY
1709	conference-floor-policy =
1710	  anyAttribute
1711	  & element xcon:floor {
1712	      attribute id { text }
1713	      & anyAttribute
1714	      & element xcon:media-label { xsd:nonNegativeInteger }+
1715	      & element xcon:algorithm { algorithm-type }?
1716	      & element xcon:max-floor-users { xsd:nonNegativeInteger }?
1717	      & element xcon:moderator-id { xsd:nonNegativeInteger }?
1718	      & anyElement*
1719	    }+
1720	# ALGORITHM POLICY
1721	algorithm-type =
1722	  xsd:string "moderator-controlled"
1723	  | xsd:string "FCFS"
1724	  | xsd:string "random"
1725	  | free-text-extension
1726	# USERS ADMISSION POLICY
1727	user-admission-policy-type =
1728	  xsd:string "closedAuthenticated"
1729	  | xsd:string "openAuthenticated"
1730	  | xsd:string "anonymous"
1731	  | free-text-extension
1732	# JOIN HANDLING TYPE
1733	join-handling-type =
1734	  xsd:string "block"
1735	  | xsd:string "confirm"
1736	  | xsd:string "allow"
1737	  | xsd:string "authenticate"
1738	  | xsd:string "directed-operator"
1739	  | free-text-extension
1740	# DENY USERLIST
1741	deny-user-list-type =
1742	  anyAttribute
1743	  & element xcon:target {
1744	      attribute uri { xsd:anyURI },
1745	      anyAttribute
1746	    }*
1747	  & anyElement*
1748	# ALLOWED USERS LIST TYPE
1749	allowed-users-list-type =
1750	  anyAttribute
1751	  & element xcon:target { target-type }*
1752	  & element xcon:persistent-list { persistent-list-type }?
1753	  & anyElement*
1754	# PERSISTENT LIST TYPE
1755	persistent-list-type =
1756	  element xcon:user {
1757	    attribute name { text }
1758	    & attribute nickname { text }
1759	    & attribute id { text }
1760	    & anyAttribute
1761	    & element xcon:e-mail { text }*
1762	    & anyElement*
1763	  }*
1764	  & anyElement*
1765	# TARGET TYPE
1766	target-type =
1767	  attribute uri { xsd:anyURI },
1768	  attribute method { method-type },
1769	  anyAttribute
1770	# METHOD TYPE
1771	method-type =
1772	  xsd:string "dial-in"
1773	  | xsd:string "dial-out"
1774	  | xsd:string "refer"
1775	  | free-text-extension
1776	# ANONYMITY TYPE
1777	provide-anonymity-type =
1778	  "private" | "semi-private" | "hidden" | free-text-extension
1779	# MIXER TYPE
1780	mixer-type =
1781	  attribute name { mixer-name-type }
1782	  & anyAttribute
1783	  & element xcon:controls { control-type }*
1784	  & element xcon:floor {
1785	      attribute id { text },
1786	      anyAttribute,
1787	      xsd:boolean
1788	    }*
1789	  & anyElement*
1790	# MIXER NAME TYPE
1791	mixer-name-type =
1792	  "VideoIn" | "VideoOut" | "AudioOut" | "AudioIn" | free-text-extension

1794	# FREE TEXT EXTENSION
1795	#

1797	free-text-extension = text

1799	# *********************************
1800	# EXTENSIBILITY OF THE SCHEMA
1801	# *********************************

1803	# EXTENSIBILITY ELEMENTS
1804	#

1806	anyElement =
1807	  element * - (conference-description
1808	               | host-info
1809	               | conference-state
1810	               | users
1811	               | sidebars-by-ref
1812	               | sidebars-by-val
1813	               | display-text
1814	               | subject
1815	               | free-text
1816	               | keywords
1817	               | conf-uris
1818	               | service-uris
1819	               | maximum-user-count
1820	               | available-media
1821	               | web-page
1822	               | uris
1823	               | uri
1824	               | user-count
1825	               | active
1826	               | locked
1827	               | entry
1828	               | type
1829	               | status
1830	               | purpose
1831	               | modified
1832	               | user
1833	               | associated-aors
1834	               | roles
1835	               | languages
1836	               | cascaded-focus
1837	               | endpoint
1838	               | referred
1839	               | joining-method
1840	               | joining-info
1841	               | disconnection-method
1842	               | disconnection-info
1843	               | media
1844	               | call-info
1845	               | when
1846	               | reason
1847	               | by
1848	               | sip
1849	               | call-id
1850	               | from-tag
1851	               | to-tag
1852	               | label
1853	               | src-id
1854	               | xcon:conference-password
1855	               | xcon:mixing-mode
1856	               | xcon:codecs
1857	               | xcon:controls
1858	               | xcon:language
1859	               | xcon:allow-sidebars
1860	               | xcon:cloning-parent
1861	               | xcon:sidebar-parent
1862	               | xcon:allow-conference-event-subscription
1863	               | xcon:to-mixer
1864	               | xcon:provide-anonymity
1865	               | xcon:allow-refer-users-dynamically
1866	               | xcon:allow-invite-users-dynamically
1867	               | xcon:allow-remove-users-dynamically
1868	               | xcon:from-mixer
1869	               | xcon:join-handling
1870	               | xcon:user-admission-policy
1871	               | xcon:allowed-users-list
1872	               | xcon:deny-users-list
1873	               | xcon:floor-information
1874	               | xcon:conference-time
1875	               | xcon:provide-anonymity
1876	               | xcon:floor
1877	               | xcon:entry
1878	               | xcon:mixing-start-offset
1879	               | xcon:mixing-end-offset
1880	               | xcon:can-join-after-offset
1881	               | xcon:must-join-before-offset
1882	               | xcon:request-user
1883	               | xcon:notify-end-of-conference
1884	               | xcon:allowed-extend-mixing-end-offset
1885	               | xcon:codec
1886	               | xcon:subtype
1887	               | xcon:mute
1888	               | xcon:pause-video
1889	               | xcon:gain
1890	               | xcon:video-layout
1891	               | xcon:conference-ID
1892	               | xcon:allow-floor-events
1893	               | xcon:floor-request-handling
1894	               | xcon:conference-floor-policy
1895	               | xcon:media-label
1896	               | xcon:algorithm
1897	               | xcon:max-floor-users
1898	               | xcon:moderator-id
1899	               | xcon:target
1900	               | xcon:persistent-list
1901	               | xcon:e-mail
1902	               | xcon:user) { anyExtension }
1903	anyExtension =
1904	  (attribute * { text }
1905	   | any)*
1906	any =
1907	  element * {
1908	    (attribute * { text }
1909	     | text
1910	     | any)*
1911	  }

1913	# EXTENSIBILITY ATTRIBUTES
1914	#

1916	anyAttribute =
1917	  attribute * - (lang
1918	                 | entity
1919	                 | required-participant
1920	                 | label
1921	                 | decision
1922	                 | name
1923	                 | policy
1924	                 | uri
1925	                 | method
1926	                 | id
1927	                 | nickname) { text }*

1929	6.  XML Schema Extensibility

1931	   The Conference Information Data Model defined in this document is
1932	   meant to be extensible.  Extensions are accomplished by defining
1933	   elements or attributes qualified by namespaces other than
1934	   "urn:ietf:params:xml:ns:conference-info" and
1935	   "urn:ietf:params:xml:ns:xcon-conference-info" for use wherever the
1936	   schema allows such extensions (i.e., where the RelaxNG definition
1937	   specifies "anyAttribute" or "anyElement").

1939	   Elements or attributes from unknown namespaces MUST be ignored.

1941	7.  XML Example

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

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

1968	                CONFERENCE UNIQUE IDENTIFIERS
1969	            -->
1970	            <conf-uris>
1971	                <entry>
1972	                    <uri>tel:+3585671234</uri>
1973	                    <display-text>Conference Bridge</display-text>
1974	                    <purpose>participation</purpose>
1975	                    <xcon:conference-password
1976	                     >5678</xcon:conference-password>
1977	                </entry>
1978	                <entry>
1979	                    <uri>http://www.example.com/live.ram</uri>
1980	                    <purpose>streaming</purpose>
1981	                </entry>
1982	            </conf-uris>
1983	            <!--
1984	                SERVICE URIS
1985	            -->
1986	            <service-uris>
1987	                <entry>
1988	                    <uri>mailto:bob@example.com</uri>
1989	                    <display-text>email</display-text>
1990	                </entry>
1991	            </service-uris>
1992	            <!--
1993	                MAXIMUM USER COUNT
1994	            -->
1995	            <maximum-user-count>50</maximum-user-count>
1996	            <!--
1997	                AVAILABLE MEDIA
1998	            -->
1999	            <available-media>
2000	                <entry label="10234">
2001	                    <display-text>main audio</display-text>
2002	                    <type>audio</type>
2003	                    <status>sendrecv</status>
2004	                    <xcon:mixing-mode>automatic</xcon:mixing-mode>
2005	                    <xcon:codecs decision="automatic">
2006	                        <xcon:codec name="122" policy="allowed">
2007	                           <xcon:subtype>PCMU</xcon:subtype>
2008	                        </xcon:codec>
2009	                    </xcon:codecs>
2010	                    <xcon:controls>
2011	                        <xcon:mute>true</xcon:mute>
2012	                        <xcon:gain>50</xcon:gain>
2013	                    </xcon:controls>
2014	                </entry>
2015	                <entry label="10235">
2016	                    <display-text>main video</display-text>
2017	                    <type>video</type>
2018	                    <status>sendrecv</status>
2019	                    <xcon:mixing-mode>automatic</xcon:mixing-mode>
2020	                    <xcon:codecs decision="automatic">
2021	                        <xcon:codec name="123" policy="allowed">
2022	                           <xcon:subtype>H.263</xcon:subtype>
2023	                        </xcon:codec>

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

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

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

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

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

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

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

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

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

2168	            </user>

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

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

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

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

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

2332	            </user>

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

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

2398	    </conference-info>

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

2403	8.  Security Considerations

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

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

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

2428	   Furthermore, users may use different identifiers to access to a
2429	   conference as explained in Section 4.6.5.  These different namespaces
2430	   can be associated with a unique conference user identifier (XCON-
2431	   USERID).  A mapping database is used to map all these authenticated
2432	   user namespaces to the XCON-USERID.  There are several threats
2433	   against this database.  In order to minimize these threats, the
2434	   administrator of the conferencing system MUST ensure that only
2435	   authorized users can connect to this database (e.g., by using access
2436	   control rules).  In particular, the integrity of the database MUST be
2437	   protected against unauthorized modifications.  In addition to that,
2438	   the XCON-USERID or XCON-URI SHOULD be hard to guess.  It is critical
2439	   that the URI remain difficult to "guess" via brute force methods.
2440	   Generic security considerations for usage of URIs are discussed in
2441	   [RFC3986].

2443	   The confidentiality of the database SHOULD be protected from
2444	   unauthorized users, given that the data model contains a set of
2445	   sensitive elements (e.g., passwords), and it is RECOMMENDED the
2446	   database uses encryption mechanisms if the information is stored in
2447	   long term storage (e.g., disk).  In addition to implementing access
2448	   control, as discussed above, it is RECOMMENDED that administrators of
2449	   conferencing systems only provide access to the database over
2450	   encrypted channels (e.g., using TLS encryption) in order to avoid
2451	   eavesdroppers.  Administrators of conferencing systems SHOULD also
2452	   avoid disclosing information to unauthorized parties when a
2453	   conference is being cloned or when a sidebar is being created.  For
2454	   example, an external sidebar as defined in [RFC5239], section 9.4.2,
2455	   may include participants who were not authorized for the parent
2456	   conference.

2458	   The security considerations for authentication (Section 11.1)
2459	   described in the centralized conferencing framework [RFC5239] also
2460	   apply to this document.  Similarly, the security considerations for
2461	   authorization (Section 5.2) described in the Session Initiation
2462	   Protocol (SIP) REFER Method [RFC3515] apply to this document as well.

2464	9.  IANA Considerations

2466	9.1.  Relax NG Schema Registration

2468	  This specification registers a schema. The schema can be found
2469	  as the sole content of Section 5.

2471	     URI:  urn:ietf:params:xml:schema:xcon-conference-info

2473	     Registrant Contact: IETF XCON working group,
2474	        <xcon@ietf.org>, Oscar Novo
2475	        <Oscar.Novo@ericsson.com>

2477	     Relax NG Schema:  The Relax NG schema to be registered is contained
2478	        in Section 5.  Its first line is

2480	     default namespace = "urn:ietf:params:xml:ns:conference-info"

2482	        and its last line is

2484	     anyAttribute = attribute * - (lang | entity
2485	                    | required-participant | label | decision | name
2486	                    | policy | uri | method | id | nickname) { text }*

2488	9.2.  XML Namespace Registration
2489	   This section registers a new XML namespace.

2491	      URI:  urn:ietf:params:xml:ns:xcon-conference-info

2493	      Registrant Contact: IETF XCON working group,
2494	         <xcon@ietf.org>, Oscar Novo
2495	         <Oscar.Novo@ericsson.com>

2497	       XML:

2499	         BEGIN
2500	         <?xml version="1.0"?>
2501	         <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
2502	           "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
2503	         <html xmlns="http://www.w3.org/1999/xhtml">
2504	         <head>
2505	           <meta http-equiv="content-type"
2506	                 content="text/html;charset=iso-8859-1"/>
2507	           <title> Centralized Conferencing Namespace</title>
2508	         </head>
2509	         <body>
2510	           <h1>Namespace for Centralized Conferencing</h1>
2511	           <h2>urn:ietf:params:xml:ns:xcon-conference-info</h2>
2512	         <p>See <a href="[URL of published RFC]">RFCXXXX
2513	             [NOTE TO IANA/RFC-EDITOR:
2514	              Please replace XXXX with the RFC number of this
2515	             specification.]</a>.</p>
2516	         </body>
2517	         </html>
2518	         END

2520	9.3.  Conference Object Identifier Registration

2522	   The IANA is requested to register the following URI scheme
2523	   under the Permanent URI Schemes registry.

2525	   XCON-URI = "xcon" ":" [conf-object-id "@"] host

2527	    conf-object-id = 1*( unreserved / "+" / "=" / "/" )

2529	   host and unreserved are defined in [RFC3986]
2530	    URI scheme name: xcon
2531	    Status: permanent
2532	    URI scheme syntax: see Section 3.3.1.
2533	    URI schema semantics: see Section 3.3
2534	    Encoding considerations: see Section 8
2535	    Intended usage: see Section 3.3
2536	    Applications and/or protocols that use this URI scheme name:
2537	           Centralized Conferencing systems
2538	    Interoperability considerations: none
2539	    Security considerations: see Section 8
2540	    Relevant publications: Conference Information Data Model for
2541	           Centralized Conferencing (XCON)
2542	    Contact:  Oscar Novo<oscar novo_at_ericsson.com>
2543	    Author/Change controller:  Oscar Novo<oscar novo_at_ericsson.com>

2545	9.4.  Conference User Identifier Registration

2547	   The IANA is requested to register the following URI scheme
2548	    under the Permanent URI Schemes registry.

2550	    XCON-USERID = "xcon-userid" ":" conf-user-id

2552	    conf-user-id = 1*unreserved

2554	   unreserved is defined in [RFC3986]

2556	    URI scheme name: xcon-userid
2557	    Status: permanent
2558	    URI scheme syntax: see Section 4.6.5
2559	    URI schema semantics: see Section 4.6.5
2560	    Encoding considerations: see Section 8
2561	    Intended usage: see Section 4.6.3 and 4.6.5
2562	    Applications and/or protocols that use this URI scheme name:
2563	           Centralized Conferencing systems.
2564	    Interoperability considerations: none
2565	    Security considerations: see Section 8
2566	    Relevant publications: Conference Information Data Model for
2567	           Centralized Conferencing (XCON)
2568	    Contact:  Oscar Novo<oscar novo_at_ericsson.com>
2569	    Author/Change controller:  Oscar Novo<oscar novo_at_ericsson.com>

2571	10.  Acknowledgements

2573	   This document is really a distillation of many ideas discussed over a
2574	   long period of time.  These ideas were contributed by many different
2575	   drafts in the XCON working group and the SIPPING working group.  We
2576	   would like to thank Orit Levin, Roni Even, Adam Roach, Mary Barnes,
2577	   Chris Boulton, Umesh Chandra, Hisham Khartabil, Petri Koskelainen,
2578	   Aki Niemi, Rohan Mahy, Jonathan Lennox, Sean Duddy, Richard Barnes,
2579	   and Henning Schulzrinne for their comments.  Also, we would like to
2580	   thank Mary Barnes, and Chris Boulton for letting us use the
2581	   conference and user identifier information of their xcon drafts.
2582	   Last but not least, we would like to express our gratitude to all
2583	   those reviewers for their invaluable contribution: Simon Pietro
2584	   Romano, Lorenzo Miniero, Tobia Castaldi, Miguel Garcia, Mary Barnes,
2585	   Srivatsa Srinivasan, Avshalom Houri, Pierre Tane, and Ben Campbell.

2587	11.  References

2589	11.1.  Normative References

2591	   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
2592	              Requirement Levels", BCP 14, RFC 2119, March 1997.

2594	   [RFC3986]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
2595	              Resource Identifier (URI): Generic Syntax", STD 66,
2596	              RFC 3986, January 2005.

2598	   [RFC4575]  Rosenberg, J., Schulzrinne, H., and O. Levin, "A Session
2599	              Initiation Protocol (SIP) Event Package for Conference
2600	              State", RFC 4575, August 2006.

2602	   [RFC4582]  Camarillo, G., Ott, J., and K. Drage, "The Binary Floor
2603	              Control Protocol (BFCP)", RFC 4582, November 2006.

2605	   [RFC4583]  Camarillo, G., "Session Description Protocol (SDP) Format
2606	              for Binary Floor Control Protocol (BFCP) Streams",
2607	              RFC 4583, November 2006.

2609	   [RFC5239]  Barnes, M., Boulton, C., and O. Levin, "A Framework for
2610	              Centralized Conferencing", RFC 5239, June 2008.

2612	   [RFC5545]  Desruisseaux, B., "Internet Calendaring and Scheduling
2613	              Core Object Specification (iCalendar)", RFC 5545,
2614	              September 2009.

2616	11.2.  Informative References

2618	   [IANA]     "IANA registry for RTP Payload Types"
2619	              "http://www.iana.org/assignments/rtp-parameters".

2621	   [IANA-Lan]
2622	              "IANA Language Subtag Registry"
2623	              "http://www.iana.org/assignments/
2624	              language-subtag-registry".

2626	   [RELAX]    "RELAX NG Home Page" "ISO/IEC 19757-2:2008".

2628	   [RFC3264]  Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model
2629	              with Session Description Protocol (SDP)", RFC 3264,
2630	              June 2002.

2632	   [RFC3265]  Roach, A., "Session Initiation Protocol (SIP)-Specific
2633	              Event Notification", RFC 3265, June 2002.

2635	   [RFC3515]  Sparks, R., "The Session Initiation Protocol (SIP) Refer
2636	              Method", RFC 3515, April 2003.

2638	   [RFC4353]  Rosenberg, J., "A Framework for Conferencing with the
2639	              Session Initiation Protocol (SIP)", RFC 4353,
2640	              February 2006.

2642	   [RFC4855]  Casner, S., "Media Type Registration of RTP Payload
2643	              Formats", RFC 4855, February 2007.

2645	   [RFC5018]  Camarillo, G., "Connection Establishment in the Binary
2646	              Floor Control Protocol (BFCP)", RFC 5018, September 2007.

2648	   [RFC5646]  Phillips, A. and M. Davis, "Tags for Identifying
2649	              Languages", BCP 47, RFC 5646, September 2009.

2651	   [W3C.REC-xml-20081126]
2652	              Paoli, J., Yergeau, F., Bray, T., Maler, E., and C.
2653	              Sperberg-McQueen, "Extensible Markup Language (XML) 1.0
2654	              (Fifth Edition)", World Wide Web Consortium
2655	              Recommendation REC-xml-20081126, November 2008,
2656	              <http://www.w3.org/TR/2008/REC-xml-20081126>.

2658	Appendix A.  Non-Normative RELAX NG Schema in XML Syntax

2660	 <?xml version="1.0" encoding="UTF-8" ?>
2661	    <grammar
2662	           ns="urn:ietf:params:xml:ns:conference-info"
2663	           xmlns="http://relaxng.org/ns/structure/1.0"
2664	           xmlns:xcon="urn:ietf:params:xml:ns:xcon-conference-info"
2665	           datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
2666	           <start>
2667	            <element name="conference-info">
2668	             <ref name="conference-type"/>
2669	            </element>
2670	           </start>
2671	           <!--
2672	               CONFERENCE TYPE
2673	           -->
2674	           <define name="conference-type">
2675	            <interleave>
2676	            <attribute name="entity">
2677	             <text/>
2678	            </attribute>
2679	            <ref name="anyAttribute"/>
2680	            <optional>
2681	             <ref name="conference-description-type"/>
2682	            </optional>
2683	            <optional>
2684	             <element name="host-info">
2685	              <ref name="host-type"/>
2686	             </element>
2687	            </optional>
2688	            <optional>
2689	             <element name="conference-state">
2690	              <ref name="conference-state-type"/>
2691	             </element>
2692	            </optional>
2693	            <optional>
2694	             <element name="users">
2695	              <ref name="users-type"/>
2696	             </element>
2697	            </optional>
2698	            <optional>
2699	             <element name="sidebars-by-ref">
2700	              <ref name="uris-type"/>
2701	             </element>
2702	            </optional>
2703	            <optional>
2704	             <element name="sidebars-by-val">
2705	              <ref name="sidebars-by-val-type"/>
2706	             </element>
2707	            </optional>
2708	            <optional>
2709	             <element name="xcon:floor-information">
2710	              <ref name="floor-information-type"/>

2712	             </element>
2713	            </optional>
2714	            <zeroOrMore>
2715	             <ref name="anyElement"/>
2716	            </zeroOrMore>
2717	            </interleave>
2718	           </define>
2719	           <!--
2720	               CONFERENCE DESCRIPTION TYPE
2721	           -->
2722	           <define name="conference-description-type">
2723	            <element name="conference-description">
2724	             <interleave>
2725	             <optional>
2726	              <attribute name="lang">
2727	               <data type="language"/>
2728	              </attribute>
2729	             </optional>
2730	             <ref name="anyAttribute"/>
2731	             <optional>
2732	              <element name="display-text">
2733	               <text/>
2734	              </element>
2735	             </optional>
2736	             <optional>
2737	              <element name="subject">
2738	               <text/>
2739	              </element>
2740	             </optional>
2741	             <optional>
2742	              <element name="free-text">
2743	               <text/>
2744	              </element>
2745	             </optional>
2746	             <optional>
2747	              <element name="keywords">
2748	               <list>
2749	                <zeroOrMore>
2750	                 <data type="string"/>
2751	                </zeroOrMore>
2752	               </list>
2753	              </element>
2754	             </optional>
2755	             <optional>
2756	              <element name="conf-uris">
2757	               <ref name="uris-type"/>
2758	              </element>
2759	             </optional>
2760	             <optional>
2761	              <element name="service-uris">
2762	                 <ref name="uris-type"/>
2763	              </element>
2764	             </optional>
2765	             <optional>
2766	              <element name="maximum-user-count">
2767	               <data type="int"/>
2768	              </element>
2769	             </optional>
2770	             <optional>
2771	              <element name="available-media">
2772	               <ref name="conference-media-type"/>
2773	              </element>
2774	             </optional>
2775	             <optional>
2776	              <element name="xcon:language">
2777	               <data type="language"/>
2778	              </element>
2779	             </optional>
2780	             <optional>
2781	              <element name="xcon:allow-sidebars">
2782	               <data type="boolean"/>
2783	              </element>
2784	             </optional>
2785	             <optional>
2786	             <element name="xcon:cloning-parent">
2787	              <data type="anyURI"/>
2788	             </element>
2789	             </optional>
2790	             <optional>
2791	             <element name="xcon:sidebar-parent">
2792	              <data type="anyURI"/>
2793	             </element>
2794	             </optional>
2795	             <optional>
2796	              <element name="xcon:conference-time">
2797	               <ref name="conferencetime-type"/>
2798	              </element>
2799	             </optional>
2800	             <zeroOrMore>
2801	              <ref name="anyElement"/>
2802	             </zeroOrMore>
2803	             </interleave>
2804	            </element>
2805	           </define>
2806	           <!--
2807	               HOST TYPE

2809	           -->
2810	           <define name="host-type">
2811	            <interleave>
2812	            <optional>
2813	             <element name="display-text">
2814	              <text/>
2815	             </element>
2816	            </optional>
2817	            <optional>
2818	             <element name="web-page">
2819	              <data type="anyURI"/>
2820	             </element>
2821	            </optional>
2822	            <optional>
2823	             <element name="uris">
2824	              <ref name="uris-type"/>
2825	             </element>
2826	            </optional>
2827	            <zeroOrMore>
2828	             <ref name="anyElement"/>
2829	            </zeroOrMore>
2830	            <ref name="anyAttribute"/>
2831	            </interleave>
2832	           </define>
2833	           <!--
2834	               CONFERENCE STATE TYPE
2835	           -->
2836	           <define name="conference-state-type">
2837	            <interleave>
2838	            <ref name="anyAttribute"/>
2839	            <optional>
2840	             <element name="user-count">
2841	              <data type="unsignedInt"/>
2842	             </element>
2843	            </optional>
2844	            <optional>
2845	             <element name="active">
2846	              <data type="boolean"/>
2847	             </element>
2848	            </optional>
2849	            <optional>
2850	             <element name="locked">
2851	              <data type="boolean"/>
2852	             </element>
2853	            </optional>
2854	            <optional>
2855	             <element name="xcon:allow-conference-event-subscription">
2856	              <data type="boolean"/>

2858	             </element>
2859	            </optional>
2860	            <zeroOrMore>
2861	             <ref name="anyElement"/>
2862	            </zeroOrMore>
2863	            </interleave>
2864	           </define>
2865	           <!--
2866	               CONFERENCE MEDIA TYPE
2867	           -->
2868	           <define name="conference-media-type">
2869	            <interleave>
2870	            <ref name="anyAttribute"/>
2871	            <zeroOrMore>
2872	             <element name="entry">
2873	              <ref name="conference-medium-type"/>
2874	             </element>
2875	            </zeroOrMore>
2876	            <zeroOrMore>
2877	             <ref name="anyElement"/>
2878	            </zeroOrMore>
2879	            </interleave>
2880	           </define>
2881	           <!--
2882	               CONFERENCE MEDIUM TYPE
2883	           -->
2884	           <define name="conference-medium-type">
2885	            <interleave>
2886	            <attribute name="label">
2887	             <text/>
2888	            </attribute>
2889	            <ref name="anyAttribute"/>
2890	            <optional>
2891	             <element name="display-text">
2892	              <text/>
2893	             </element>
2894	            </optional>
2895	            <optional>
2896	             <element name="type">
2897	              <text/>
2898	             </element>
2899	            </optional>
2900	            <optional>
2901	             <element name="status">
2902	              <ref name="media-status-type"/>
2903	             </element>
2904	            </optional>
2905	            <optional>
2906	             <element name="xcon:mixing-mode">
2907	              <ref name="mixing-mode-type"/>
2908	             </element>
2909	            </optional>
2910	            <optional>
2911	             <element name="xcon:codecs">
2912	              <ref name="codecs-type"/>
2913	             </element>
2914	            </optional>
2915	            <optional>
2916	             <element name="xcon:controls">
2917	              <ref name="control-type"/>
2918	             </element>
2919	            </optional>
2920	            <zeroOrMore>
2921	             <ref name="anyElement"/>
2922	            </zeroOrMore>
2923	            </interleave>
2924	           </define>
2925	           <!--
2926	               URIs TYPE
2927	           -->
2928	           <define name="uris-type">
2929	            <interleave>
2930	            <ref name="anyAttribute"/>
2931	            <zeroOrMore>
2932	             <element name="entry">
2933	              <ref name="uri-type"/>
2934	             </element>
2935	            </zeroOrMore>
2936	            <zeroOrMore>
2937	             <ref name="anyElement"/>
2938	            </zeroOrMore>
2939	            </interleave>
2940	           </define>
2941	           <!--
2942	               URI TYPE
2943	           -->
2944	           <define name="uri-type">
2945	            <interleave>
2946	            <element name="uri">
2947	             <data type="anyURI"/>
2948	            </element>
2949	            <optional>
2950	             <element name="display-text">
2951	              <text/>
2952	             </element>
2953	            </optional>
2954	            <optional>
2955	             <element name="purpose">
2956	              <text/>
2957	             </element>
2958	            </optional>
2959	            <optional>
2960	             <element name="modified">
2961	              <ref name="execution-type"/>
2962	             </element>
2963	            </optional>
2964	            <zeroOrMore>
2965	             <element name="xcon:conference-password">
2966	              <text/>
2967	             </element>
2968	            </zeroOrMore>
2969	            <zeroOrMore>
2970	             <ref name="anyElement"/>
2971	            </zeroOrMore>
2972	            <ref name="anyAttribute"/>
2973	           </interleave>

2975	           </define>
2976	           <!--
2977	               USERS TYPE
2978	           -->
2979	           <define name="users-type">
2980	            <interleave>
2981	            <ref name="anyAttribute"/>
2982	            <zeroOrMore>
2983	             <element name="user">
2984	              <ref name="user-type"/>
2985	             </element>
2986	            </zeroOrMore>
2987	            <optional>
2988	             <element name="xcon:join-handling">
2989	              <ref name="join-handling-type"/>
2990	             </element>
2991	            </optional>
2992	            <optional>
2993	             <element name="xcon:user-admission-policy">
2994	              <ref name="user-admission-policy-type"/>
2995	             </element>
2996	            </optional>
2997	            <optional>
2998	             <element name="xcon:allowed-users-list">
2999	              <ref name="allowed-users-list-type"/>
3000	             </element>
3001	            </optional>
3002	            <optional>
3003	             <element name="xcon:deny-users-list">
3004	              <ref name="deny-user-list-type"/>
3005	             </element>
3006	            </optional>
3007	            <zeroOrMore>
3008	             <ref name="anyElement"/>
3009	            </zeroOrMore>
3010	            </interleave>
3011	           </define>
3012	           <!--
3013	               USER TYPE
3014	           -->
3015	           <define name="user-type">
3016	            <interleave>
3017	            <attribute name="entity">
3018	             <data type="anyURI"/>
3019	            </attribute>
3020	            <ref name="anyAttribute"/>
3021	            <optional>
3022	             <element name="display-text">
3023	              <text/>
3024	             </element>
3025	            </optional>
3026	            <optional>
3027	             <element name="associated-aors">
3028	               <ref name="uris-type"/>
3029	             </element>
3030	            </optional>
3031	            <optional>
3032	             <element name="roles">
3033	              <oneOrMore>
3034	               <element name="entry">
3035	                <ref name="single-role-type"/>
3036	               </element>
3037	              </oneOrMore>
3038	             </element>
3039	            </optional>
3040	            <optional>
3041	             <element name="languages">
3042	              <list>
3043	               <data type="language"/>
3044	              </list>
3045	             </element>
3046	            </optional>
3047	            <optional>
3048	             <element name="cascaded-focus">
3049	              <data type="anyURI"/>

3051	             </element>
3052	            </optional>
3053	            <zeroOrMore>
3054	             <element name="endpoint">
3055	              <ref name="endpoint-type"/>
3056	             </element>
3057	            </zeroOrMore>
3058	            <optional>
3059	             <element name="xcon:provide-anonymity">
3060	              <ref name="provide-anonymity-type"/>
3061	             </element>
3062	            </optional>
3063	           <optional>
3064	             <element name="xcon:allow-refer-users-dynamically">
3065	              <data type="boolean"/>
3066	             </element>
3067	            </optional>
3068	            <optional>
3069	             <element name="xcon:allow-invite-users-dynamically">
3070	              <data type="boolean"/>
3071	             </element>
3072	            </optional>
3073	            <optional>
3074	             <element name="xcon:allow-remove-users-dynamically">
3075	              <data type="boolean"/>
3076	             </element>
3077	            </optional>
3078	             <zeroOrMore>
3079	             <ref name="anyElement"/>
3080	            </zeroOrMore>
3081	            </interleave>
3082	           </define>
3083	           <!--
3084	               ENDPOINT TYPE
3085	           -->
3086	           <define name="endpoint-type">
3087	            <interleave>
3088	            <attribute name="entity">
3089	             <text/>
3090	            </attribute>
3091	            <ref name="anyAttribute"/>
3092	            <optional>
3093	             <element name="display-text">
3094	              <text/>
3095	             </element>
3096	            </optional>
3097	            <optional>
3098	             <element name="referred">
3099	               <ref name="execution-type"/>
3100	             </element>
3101	            </optional>
3102	            <optional>
3103	             <element name="status">
3104	              <ref name="endpoint-status-type"/>
3105	             </element>
3106	            </optional>
3107	            <optional>
3108	             <element name="joining-method">
3109	              <ref name="joining-type"/>
3110	             </element>
3111	            </optional>
3112	            <optional>
3113	             <element name="joining-info">
3114	               <ref name="execution-type"/>
3115	             </element>
3116	            </optional>
3117	            <optional>
3118	             <element name="disconnection-method">
3119	              <ref name="disconnection-type"/>
3120	             </element>
3121	            </optional>
3122	            <optional>
3123	             <element name="disconnection-info">
3124	              <ref name="execution-type"/>
3125	             </element>
3126	            </optional>
3127	            <zeroOrMore>
3128	             <element name="media">
3129	              <ref name="media-type"/>
3130	             </element>
3131	            </zeroOrMore>
3132	            <optional>
3133	             <element name="call-info">
3134	              <ref name="call-type"/>
3135	             </element>
3136	            </optional>
3137	            <zeroOrMore>
3138	             <ref name="anyElement"/>
3139	            </zeroOrMore>
3140	            </interleave>
3141	           </define>
3142	           <!--
3143	               ENDPOINT STATUS TYPE
3144	           -->
3145	           <define name="endpoint-status-type">
3146	            <choice>
3147	             <value>pending</value>
3148	             <value>dialing-out</value>
3149	             <value>dialing-in</value>
3150	             <value>alerting</value>
3151	             <value>on-hold</value>
3152	             <value>connected</value>
3153	             <value>muted-via-focus</value>
3154	             <value>disconnecting</value>
3155	             <value>disconnected</value>
3156	             <ref name="free-text-extension"/>
3157	            </choice>
3158	           </define>
3159	           <!--
3160	               JOINING TYPE
3161	           -->
3162	           <define name="joining-type">
3163	            <choice>
3164	             <value>dialed-in</value>
3165	             <value>dialed-out</value>
3166	             <value>focus-owner</value>
3167	             <ref name="free-text-extension"/>
3168	            </choice>
3169	           </define>
3170	           <!--
3171	               DISCONNECTION TYPE
3172	           -->
3173	           <define name="disconnection-type">
3174	            <choice>
3175	             <value>departed</value>
3176	             <value>booted</value>
3177	             <value>failed</value>
3178	             <value>busy</value>
3179	             <ref name="free-text-extension"/>
3180	            </choice>
3181	           </define>
3182	           <!--
3183	               EXECUTION TYPE
3184	           -->
3185	           <define name="execution-type">
3186	            <interleave>
3187	            <optional>
3188	             <element name="when">
3189	              <data type="dateTime"/>
3190	             </element>
3191	            </optional>
3192	            <optional>
3193	             <element name="reason">
3194	              <text/>

3196	             </element>
3197	            </optional>
3198	            <optional>
3199	             <element name="by">
3200	              <data type="anyURI"/>
3201	             </element>
3202	            </optional>
3203	            <ref name="anyAttribute"/>
3204	            </interleave>
3205	           </define>
3206	           <!--
3207	               CALL TYPE
3208	           -->
3209	           <define name="call-type">
3210	            <interleave>
3211	             <element name="sip">
3212	              <ref name="sip-dialog-id-type"/>
3213	             </element>
3214	             <zeroOrMore>
3215	              <ref name="anyElement"/>
3216	             </zeroOrMore>
3217	             <ref name="anyAttribute"/>
3218	            </interleave>
3219	           </define>
3220	           <!--
3221	               SIP DIALOG ID TYPE
3222	           -->
3223	           <define name="sip-dialog-id-type">
3224	            <interleave>
3225	            <optional>
3226	            <element name="display-text">
3227	             <text/>
3228	            </element>
3229	            </optional>
3230	            <element name="call-id">
3231	             <text/>
3232	            </element>
3233	            <element name="from-tag">
3234	             <text/>
3235	            </element>
3236	            <element name="to-tag">
3237	             <text/>
3238	            </element>
3239	            <zeroOrMore>
3240	             <ref name="anyElement"/>
3241	            </zeroOrMore>
3242	            <ref name="anyAttribute"/>
3243	            </interleave>

3245	           </define>
3246	           <!--
3247	               MEDIA TYPE
3248	           -->
3249	           <define name="media-type">
3250	            <interleave>
3251	            <attribute name="id">
3252	             <data type="int"/>
3253	            </attribute>
3254	            <ref name="anyAttribute"/>
3255	            <optional>
3256	             <element name="display-text">
3257	              <text/>
3258	             </element>
3259	            </optional>
3260	            <optional>
3261	             <element name="type">
3262	              <text/>
3263	             </element>
3264	            </optional>
3265	            <optional>
3266	             <element name="label">
3267	              <text/>
3268	             </element>
3269	            </optional>
3270	            <optional>
3271	             <element name="src-id">
3272	              <text/>
3273	             </element>
3274	            </optional>
3275	            <optional>
3276	             <element name="status">
3277	              <ref name="media-status-type"/>
3278	             </element>
3279	            </optional>
3280	            <optional>
3281	             <element name="xcon:to-mixer">
3282	              <ref name="mixer-type"/>
3283	             </element>
3284	            </optional>
3285	            <optional>
3286	             <element name="xcon:from-mixer">
3287	              <ref name="mixer-type"/>
3288	             </element>
3289	            </optional>
3290	            <zeroOrMore>
3291	             <ref name="anyElement"/>
3292	            </zeroOrMore>
3293	            </interleave>
3294	           </define>
3295	           <!--
3296	               MEDIA STATUS TYPE
3297	           -->
3298	           <define name="media-status-type">
3299	            <choice>
3300	             <value>recvonly</value>
3301	             <value>sendonly</value>
3302	             <value>sendrecv</value>
3303	             <value>inactive</value>
3304	             <ref name="free-text-extension"/>
3305	            </choice>
3306	           </define>
3307	           <!--
3308	               SIDEBARS-BY-VAL TYPE
3309	           -->
3310	           <define name="sidebars-by-val-type">
3311	            <interleave>
3312	            <ref name="anyAttribute"/>
3313	            <zeroOrMore>
3314	             <element name="entry">
3315	              <ref name="conference-type"/>
3316	             </element>
3317	            </zeroOrMore>
3318	            <zeroOrMore>
3319	             <ref name="anyElement"/>
3320	            </zeroOrMore>
3321	            </interleave>
3322	           </define>
3323	           <!--
3324	               CONFERENCE TIME
3325	           -->
3326	           <define name="conferencetime-type">
3327	            <interleave>
3328	            <ref name="anyAttribute"/>
3329	            <zeroOrMore>
3330	             <element name="xcon:entry">
3331	              <element name="xcon:base">
3332	               <text/>
3333	              </element>
3334	              <optional>
3335	               <element name="xcon:mixing-start-offset">
3336	                 <ref name="time-type"/>
3337	                 <attribute name="required-participant">
3338	                  <ref name="single-role-type"/>
3339	                 </attribute>
3340	                <ref name="anyAttribute"/>

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

3506	            <zeroOrMore>
3507	             <ref name="anyElement"/>
3508	            </zeroOrMore>
3509	            </interleave>
3510	           </define>
3511	           <!--
3512	               GAIN TYPE
3513	           -->
3514	           <define name="gain-type">
3515	             <data type="int">
3516	               <param name="minInclusive">-127</param>
3517	               <param name="maxInclusive">127</param>
3518	             </data>
3519	           </define>
3520	           <!--
3521	               VIDEO LAYOUT TYPE
3522	           -->

3524	           <define name="video-layout-type">
3525	              <choice>
3526	               <value type="string">single-view</value>
3527	               <value type="string">dual-view</value>
3528	               <value type="string">dual-view-crop</value>
3529	               <value type="string">dual-view-2x1</value>
3530	               <value type="string">dual-view-2x1-crop</value>
3531	               <value type="string">quad-view</value>
3532	               <value type="string">multiple-3x3</value>
3533	               <value type="string">multiple-4x4</value>
3534	               <value type="string">multiple-5x1</value>
3535	               <value type="string">automatic</value>
3536	               <ref name="free-text-extension"/>
3537	              </choice>
3538	           </define>
3539	           <!--
3540	               FLOOR INFORMATION TYPE
3541	           -->
3542	           <define name="floor-information-type">
3543	            <interleave>
3544	            <ref name="anyAttribute"/>
3545	            <optional>
3546	             <element name="xcon:conference-ID">
3547	              <data type="unsignedLong"/>
3548	             </element>
3549	            </optional>
3550	            <optional>
3551	             <element name="xcon:allow-floor-events">
3552	              <data type="boolean"/>
3553	             </element>
3554	            </optional>
3555	            <optional>
3556	             <element name="xcon:floor-request-handling">
3557	              <ref name="floor-request-type"/>
3558	             </element>
3559	            </optional>
3560	            <optional>
3561	             <element name="xcon:conference-floor-policy">
3562	              <ref name="conference-floor-policy"/>
3563	             </element>
3564	            </optional>
3565	            <zeroOrMore>
3566	             <ref name="anyElement"/>
3567	            </zeroOrMore>
3568	            </interleave>
3569	           </define>
3570	           <!--
3571	               FLOOR REQUEST TYPE
3572	           -->
3573	           <define name="floor-request-type">
3574	            <choice>
3575	             <value type="string">block</value>
3576	             <value type="string">confirm</value>
3577	             <ref name="free-text-extension"/>
3578	            </choice>
3579	           </define>
3580	           <!--
3581	               CONFERENCE FLOOR POLICY
3582	           -->
3583	           <define name="conference-floor-policy">
3584	            <interleave>
3585	            <ref name="anyAttribute"/>
3586	            <oneOrMore>
3587	             <element name="xcon:floor">
3588	              <interleave>
3589	              <attribute name="id">
3590	               <text/>
3591	              </attribute>
3592	              <ref name="anyAttribute"/>
3593	              <oneOrMore>
3594	               <element name="xcon:media-label">
3595	                <data type="nonNegativeInteger"/>
3596	               </element>
3597	              </oneOrMore>
3598	              <optional>
3599	               <element name="xcon:algorithm">
3600	                <ref name="algorithm-type"/>
3601	               </element>
3602	              </optional>
3603	              <optional>
3604	               <element name="xcon:max-floor-users">
3605	                <data type="nonNegativeInteger"/>
3606	               </element>
3607	              </optional>
3608	              <optional>
3609	               <element name="xcon:moderator-id">
3610	                <data type="nonNegativeInteger"/>
3611	               </element>
3612	              </optional>
3613	              <zeroOrMore>
3614	               <ref name="anyElement"/>
3615	              </zeroOrMore>
3616	              </interleave>
3617	             </element>
3618	            </oneOrMore>
3619	            </interleave>
3620	           </define>
3621	           <!--
3622	               ALGORITHM POLICY
3623	           -->
3624	           <define name="algorithm-type">
3625	            <choice>
3626	             <value type="string">moderator-controlled</value>
3627	             <value type="string">FCFS</value>
3628	             <value type="string">random</value>
3629	             <ref name="free-text-extension"/>
3630	            </choice>
3631	           </define>
3632	           <!--
3633	               USERS ADMISSION POLICY
3634	           -->
3635	           <define name="user-admission-policy-type">
3636	            <choice>
3637	             <value type="string">closedAuthenticated</value>
3638	             <value type="string">openAuthenticated</value>
3639	             <value type="string">anonymous</value>
3640	             <ref name="free-text-extension"/>
3641	            </choice>

3643	           </define>
3644	           <!--
3645	               JOIN HANDLING TYPE
3646	           -->
3647	           <define name="join-handling-type">
3648	            <choice>
3649	             <value type="string">block</value>
3650	             <value type="string">confirm</value>
3651	             <value type="string">allow</value>
3652	             <value type="string">authenticate</value>
3653	             <value type="string">directed-operator</value>
3654	             <ref name="free-text-extension"/>
3655	            </choice>
3656	           </define>
3657	           <!--
3658	               DENY USERLIST
3659	           -->
3660	           <define name="deny-user-list-type">
3661	            <interleave>
3662	            <ref name="anyAttribute"/>
3663	            <zeroOrMore>
3664	             <element name="xcon:target">
3665	              <attribute name="uri">
3666	               <data type="anyURI"/>
3667	              </attribute>
3668	              <ref name="anyAttribute"/>
3669	             </element>
3670	            </zeroOrMore>
3671	            <zeroOrMore>
3672	             <ref name="anyElement"/>
3673	            </zeroOrMore>
3674	            </interleave>
3675	           </define>
3676	           <!--
3677	               ALLOWED USERS LIST TYPE
3678	           -->
3679	           <define name="allowed-users-list-type">
3680	            <interleave>
3681	            <ref name="anyAttribute"/>
3682	            <zeroOrMore>
3683	             <element name="xcon:target">
3684	              <ref name="target-type"/>
3685	             </element>
3686	            </zeroOrMore>
3687	            <optional>
3688	             <element name="xcon:persistent-list">
3689	              <ref name="persistent-list-type"/>
3690	             </element>
3691	            </optional>
3692	            <zeroOrMore>
3693	             <ref name="anyElement"/>
3694	            </zeroOrMore>
3695	            </interleave>
3696	           </define>
3697	           <!--
3698	               PERSISTENT LIST TYPE
3699	           -->
3700	           <define name="persistent-list-type">
3701	            <interleave>
3702	              <zeroOrMore>
3703	               <element name="xcon:user">
3704	                <interleave>
3705	                <attribute name="name">
3706	                 <text/>
3707	                </attribute>
3708	                <attribute name="nickname">
3709	                 <text/>
3710	                </attribute>
3711	                <attribute name="id">
3712	                 <text/>
3713	                </attribute>
3714	                <ref name="anyAttribute"/>
3715	                <zeroOrMore>
3716	                 <element name="xcon:e-mail">
3717	                  <text/>
3718	                 </element>
3719	                </zeroOrMore>
3720	                <zeroOrMore>
3721	                 <ref name="anyElement"/>
3722	                </zeroOrMore>
3723	                </interleave>

3725	               </element>
3726	             </zeroOrMore>
3727	             <zeroOrMore>
3728	              <ref name="anyElement"/>
3729	             </zeroOrMore>
3730	            </interleave>
3731	           </define>
3732	           <!--
3733	               TARGET TYPE
3734	           -->
3735	           <define name="target-type">
3736	            <attribute name="uri">
3737	             <data type="anyURI"/>
3738	            </attribute>
3739	            <attribute name="method">
3740	             <ref name="method-type"/>
3741	            </attribute>
3742	            <ref name="anyAttribute"/>
3743	           </define>
3744	           <!--
3745	               METHOD TYPE
3746	           -->
3747	           <define name="method-type">
3748	            <choice>
3749	             <value type="string">dial-in</value>
3750	             <value type="string">dial-out</value>
3751	             <value type="string">refer</value>
3752	             <ref name="free-text-extension"/>
3753	            </choice>
3754	           </define>
3755	           <!--
3756	               ANONYMITY TYPE
3757	           -->
3758	           <define name="provide-anonymity-type">
3759	              <choice>
3760	               <value>private</value>
3761	               <value>semi-private</value>
3762	               <value>hidden</value>
3763	               <ref name="free-text-extension"/>
3764	              </choice>
3765	           </define>
3766	           <!--
3767	               MIXER TYPE
3768	           -->
3769	           <define name="mixer-type">
3770	            <interleave>
3771	            <attribute name="name">
3772	             <ref name="mixer-name-type"/>

3774	            </attribute>

3776	            <ref name="anyAttribute"/>
3777	            <zeroOrMore>
3778	             <element name="xcon:floor">
3779	              <attribute name="id">
3780	               <text/>
3781	              </attribute>
3782	              <ref name="anyAttribute"/>
3783	              <data type="boolean"/>
3784	             </element>
3785	            </zeroOrMore>
3786	            <zeroOrMore>
3787	             <element name="xcon:controls">
3788	              <ref name="control-type"/>
3789	             </element>
3790	            </zeroOrMore>
3791	            <zeroOrMore>
3792	             <ref name="anyElement"/>
3793	            </zeroOrMore>
3794	            </interleave>
3795	           </define>
3796	           <!--
3797	               MIXER NAME TYPE
3798	           -->
3799	           <define name="mixer-name-type">
3800	             <choice>
3801	              <value>VideoIn</value>
3802	              <value>VideoOut</value>
3803	              <value>AudioOut</value>
3804	              <value>AudioIn</value>
3805	              <ref name="free-text-extension"/>
3806	             </choice>
3807	           </define>
3808	           <!--
3809	               FREE TEXT EXTENSION
3810	           -->
3811	           <define name="free-text-extension">
3812	            <text/>
3813	           </define>

3815	           <!--
3816	            *********************************
3817	            EXTENSIBILITY OF THE SCHEMA
3818	            *********************************
3819	           -->
3820	           <!--
3821	               EXTENSIBILITY ELEMENTS

3823	           -->
3824	           <define name="anyElement">
3825	            <element>
3826	             <anyName>
3827	              <except>
3828	               <name>conference-description</name>
3829	               <name>host-info</name>
3830	               <name>conference-state</name>
3831	               <name>users</name>
3832	               <name>sidebars-by-ref</name>
3833	               <name>sidebars-by-val</name>
3834	               <name>display-text</name>
3835	               <name>subject</name>
3836	               <name>free-text</name>
3837	               <name>keywords</name>
3838	               <name>conf-uris</name>
3839	               <name>service-uris</name>
3840	               <name>maximum-user-count</name>
3841	               <name>available-media</name>
3842	               <name>web-page</name>
3843	               <name>uris</name>
3844	               <name>uri</name>
3845	               <name>user-count</name>
3846	               <name>active</name>
3847	               <name>locked</name>
3848	               <name>entry</name>
3849	               <name>type</name>
3850	               <name>status</name>
3851	               <name>purpose</name>
3852	               <name>modified</name>
3853	               <name>user</name>
3854	               <name>associated-aors</name>
3855	               <name>roles</name>
3856	               <name>languages</name>
3857	               <name>cascaded-focus</name>
3858	               <name>endpoint</name>
3859	               <name>referred</name>
3860	               <name>joining-method</name>
3861	               <name>joining-info</name>
3862	               <name>disconnection-method</name>
3863	               <name>disconnection-info</name>
3864	               <name>media</name>
3865	               <name>call-info</name>
3866	               <name>when</name>
3867	               <name>reason</name>
3868	               <name>by</name>
3869	               <name>sip</name>
3870	               <name>call-id</name>
3871	               <name>from-tag</name>
3872	               <name>to-tag</name>
3873	               <name>label</name>
3874	               <name>src-id</name>
3875	               <name>xcon:conference-password</name>
3876	               <name>xcon:mixing-mode</name>
3877	               <name>xcon:codecs</name>
3878	               <name>xcon:controls</name>
3879	               <name>xcon:language</name>
3880	               <name>xcon:allow-sidebars</name>
3881	               <name>xcon:cloning-parent</name>
3882	               <name>xcon:sidebar-parent</name>
3883	               <name>xcon:allow-conference-event-subscription</name>
3884	               <name>xcon:to-mixer</name>
3885	               <name>xcon:provide-anonymity</name>
3886	               <name>xcon:allow-refer-users-dynamically</name>
3887	               <name>xcon:allow-invite-users-dynamically</name>
3888	               <name>xcon:allow-remove-users-dynamically</name>
3889	               <name>xcon:from-mixer</name>
3890	               <name>xcon:join-handling</name>
3891	               <name>xcon:user-admission-policy</name>
3892	               <name>xcon:allowed-users-list</name>
3893	               <name>xcon:deny-users-list</name>
3894	               <name>xcon:floor-information</name>
3895	               <name>xcon:conference-time</name>
3896	               <name>xcon:provide-anonymity</name>
3897	               <name>xcon:floor</name>
3898	               <name>xcon:entry</name>
3899	               <name>xcon:mixing-start-offset</name>
3900	               <name>xcon:mixing-end-offset</name>
3901	               <name>xcon:can-join-after-offset</name>
3902	               <name>xcon:must-join-before-offset</name>
3903	               <name>xcon:request-user</name>
3904	               <name>xcon:notify-end-of-conference</name>
3905	               <name>xcon:allowed-extend-mixing-end-offset</name>
3906	               <name>xcon:codec</name>
3907	               <name>xcon:subtype</name>
3908	               <name>xcon:mute</name>
3909	               <name>xcon:pause-video</name>
3910	               <name>xcon:gain</name>
3911	               <name>xcon:video-layout</name>
3912	               <name>xcon:conference-ID</name>
3913	               <name>xcon:allow-floor-events</name>
3914	               <name>xcon:floor-request-handling</name>
3915	               <name>xcon:conference-floor-policy</name>
3916	               <name>xcon:media-label</name>
3917	               <name>xcon:algorithm</name>
3918	               <name>xcon:max-floor-users</name>
3919	               <name>xcon:moderator-id</name>
3920	               <name>xcon:target</name>
3921	               <name>xcon:persistent-list</name>
3922	               <name>xcon:e-mail</name>
3923	               <name>xcon:user</name>
3924	              </except>
3925	             </anyName>
3926	             <ref name="anyExtension"/>
3927	            </element>
3928	           </define>

3930	           <define name="anyExtension">
3931	            <zeroOrMore>
3932	             <choice>
3933	              <attribute>
3934	               <anyName/>
3935	              </attribute>
3936	              <ref name="any"/>
3937	             </choice>
3938	            </zeroOrMore>
3939	           </define>

3941	           <define name="any">
3942	            <element>
3943	             <anyName/>
3944	             <zeroOrMore>
3945	              <choice>
3946	               <attribute>
3947	                <anyName/>
3948	               </attribute>
3949	               <text/>
3950	               <ref name="any"/>
3951	              </choice>
3952	             </zeroOrMore>
3953	           </element>
3954	           </define>

3956	           <!--
3957	               EXTENSIBILITY ATTRIBUTES
3958	           -->

3960	           <define name="anyAttribute">
3961	            <zeroOrMore>
3962	             <attribute>
3963	              <anyName>
3964	               <except>
3965	                <name ns="http://www.w3.org/XML/1998/namespace">lang
3966	                </name>
3967	                <name ns="">entity</name>
3968	                <name ns="">required-participant</name>
3969	                <name ns="">label</name>
3970	                <name ns="">decision</name>
3971	                <name ns="">name</name>
3972	                <name ns="">policy</name>
3973	                <name ns="">uri</name>
3974	                <name ns="">method</name>
3975	                <name ns="">id</name>
3976	                <name ns="">nickname</name>
3977	               </except>
3978	              </anyName>
3979	             </attribute>
3980	            </zeroOrMore>
3981	           </define>
3982	          </grammar>

3984	Appendix B.  Non-Normative W3C XML Schema

3986	   The non-normative W3C XML schema defines extension elements in the
3987	   "urn:ietf:params:xml:ns:xcon-conference-info" namespace.  Note that
3988	   <xs:any> extensions in this schema are stricter than in the normative
3989	   RELAX NG schema [RELAX], and the normative RELAX NG schema [RELAX]
3990	   allows unordered child elements unlike this schema (and the [RFC4575]
3991	   schema).  Also note that this schema allows also otherwise valid
3992	   extension elements to appear in the non-allowed positions.  Likewise
3993	   the cardinalities of these extension elements can not be constrained
3994	   with this schema.

3996	<?xml version="1.0" encoding="UTF-8"?>
3997	  <xs:schema
3998	     xmlns="urn:ietf:params:xml:ns:xcon-conference-info"
3999	     xmlns:info="urn:ietf:params:xml:ns:conference-info"
4000	     xmlns:xs="http://www.w3.org/2001/XMLSchema"
4001	     attributeFormDefault="unqualified" elementFormDefault="qualified"
4002	     targetNamespace="urn:ietf:params:xml:ns:xcon-conference-info">

4004	    <xs:import namespace="urn:ietf:params:xml:ns:conference-info"
4005	      schemaLocation="rfc4575.xsd"/>

4007	    <xs:import namespace="http://www.w3.org/XML/1998/namespace"
4008	      schemaLocation="http://www.w3.org/2001/03/xml.xsd"/>

4010	    <xs:element name="mixing-mode" type="mixing-mode-type"/>
4011	    <xs:element name="codecs" type="codecs-type"/>
4012	    <xs:element name="conference-password" type="xs:string"/>
4013	    <xs:element name="controls" type="controls-type"/>
4014	    <xs:element name="language" type="xs:language"/>
4015	    <xs:element name="allow-sidebars" type="xs:boolean"/>
4016	    <xs:element name="cloning-parent" type="xs:anyURI"/>
4017	    <xs:element name="sidebar-parent" type="xs:anyURI"/>
4018	    <xs:element name="conference-time" type="conference-time-type"/>
4019	    <xs:element name="allow-conference-event-subscription"
4020	      type="xs:boolean"/>
4021	    <xs:element name="to-mixer" type="mixer-type"/>
4022	    <xs:element name="provide-anonymity"
4023	      type="provide-anonymity-type"/>
4024	    <xs:element name="allow-refer-users-dynamically"
4025	      type="xs:boolean"/>
4026	    <xs:element name="allow-invite-users-dynamically"
4027	      type="xs:boolean"/>
4028	    <xs:element name="allow-remove-users-dynamically"
4029	      type="xs:boolean"/>
4030	    <xs:element name="from-mixer" type="mixer-type"/>
4031	    <xs:element name="join-handling" type="join-handling-type"/>
4032	    <xs:element name="user-admission-policy"
4033	      type="user-admission-policy-type"/>
4034	    <xs:element name="allowed-users-list"
4035	      type="allowed-users-list-type"/>
4036	    <xs:element name="deny-users-list" type="deny-users-list-type"/>
4037	    <xs:element name="floor-information" type="floor-information-type"/>

4039	    <!-- CONFERENCE TIME -->

4041	    <xs:complexType name="conference-time-type">
4042	      <xs:sequence>
4043	        <xs:element name="entry"
4044	          minOccurs="0" maxOccurs="unbounded">
4045	          <xs:complexType>
4046	            <xs:sequence>
4047	              <xs:element name="base"
4048	                type="xs:string" minOccurs="1"/>
4049	              <xs:element name="mixing-start-offset" minOccurs="0">
4050	                <xs:complexType>
4051	                  <xs:simpleContent>
4052	                    <xs:extension base="time-type">
4053	                     <xs:attribute name="required-participant"
4054	                       type="role-type" use="required"/>
4055	                      <xs:anyAttribute namespace="##any"
4056	                        processContents="lax"/>
4057	                    </xs:extension>
4058	                  </xs:simpleContent>
4059	                </xs:complexType>
4060	              </xs:element>
4061	              <xs:element name="mixing-end-offset" minOccurs="0">
4062	                <xs:complexType>
4063	                  <xs:simpleContent>
4064	                    <xs:extension base="time-type">
4065	                      <xs:attribute name="required-participant"
4066	                        type="role-type" use="required"/>
4067	                      <xs:anyAttribute namespace="##any"
4068	                        processContents="lax"/>
4069	                    </xs:extension>
4070	                  </xs:simpleContent>
4071	                </xs:complexType>
4072	              </xs:element>
4073	              <xs:element name="can-join-after-offset" type="time-type"
4074	                minOccurs="0"/>
4075	              <xs:element name="must-join-before-offset"
4076	                type="time-type" minOccurs="0"/>
4077	              <xs:element name="request-user" type="time-type"
4078	                minOccurs="0"/>
4079	              <xs:element name="notify-end-of-conference"
4080	                type="xs:nonNegativeInteger" minOccurs="0"/>
4081	              <xs:element name="allowed-extend-mixing-end-offset"
4082	                type="xs:boolean" minOccurs="0"/>
4083	              <xs:any namespace="##other" processContents="lax"
4084	                minOccurs="0" maxOccurs="unbounded"/>
4085	            </xs:sequence>
4086	          </xs:complexType>
4087	        </xs:element>
4088	        <xs:any namespace="##other" processContents="lax"
4089	          minOccurs="0" maxOccurs="unbounded"/>
4090	      </xs:sequence>
4091	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4092	    </xs:complexType>

4094	    <!-- TIME TYPE -->

4096	     <xs:simpleType name="time-type">
4097	      <xs:restriction base="xs:dateTime">
4098	        <xs:pattern value=".+T.+Z.*"/>
4099	       </xs:restriction>
4100	     </xs:simpleType>

4102	    <!-- ROLE-TYPE -->

4104	    <xs:simpleType name="role-type">
4105	     <xs:restriction base="xs:string">
4106	      <xs:pattern value="none"/>
4107	      <xs:pattern value="administrator"/>
4108	      <xs:pattern value="moderator"/>
4109	      <xs:pattern value="user"/>
4110	      <xs:pattern value="observer"/>
4111	      <xs:pattern value="participant"/>
4112	      <xs:pattern value=".+"/>
4113	     </xs:restriction>
4114	    </xs:simpleType>

4116	    <!-- MIXING MODE TYPE -->

4118	    <xs:simpleType name="mixing-mode-type">
4119	      <xs:restriction base="xs:string">
4120	        <xs:pattern value="moderator-controlled"/>
4121	        <xs:pattern value="FCFS"/>
4122	        <xs:pattern value="automatic"/>
4123	        <xs:pattern value=".+"/>
4124	      </xs:restriction>
4125	    </xs:simpleType>

4127	    <!-- CODECS TYPE -->

4129	    <xs:complexType name="codecs-type">
4130	      <xs:sequence>
4131	        <xs:element name="codec" type="codec-type"/>
4132	        <xs:any namespace="##other" processContents="lax"
4133	          minOccurs="0" maxOccurs="unbounded"/>
4134	      </xs:sequence>
4135	      <xs:attribute name="decision"
4136	        type="decision-type" use="required"/>
4137	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4138	    </xs:complexType>

4140	    <!-- CODEC TYPE -->

4142	    <xs:complexType name="codec-type">
4143	      <xs:sequence>
4144	        <xs:element name="subtype" type="xs:string" minOccurs="0"/>
4145	        <xs:any namespace="##other" processContents="lax"
4146	          minOccurs="0" maxOccurs="unbounded"/>
4147	      </xs:sequence>
4148	      <xs:attribute name="name"
4149	        type="xs:string" use="required"/>
4150	      <xs:attribute name="policy"
4151	        type="policy-type" use="required"/>
4152	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4153	    </xs:complexType>

4155	    <!-- DECISION TYPE -->

4157	    <xs:simpleType name="decision-type">
4158	      <xs:restriction base="xs:string">
4159	        <xs:pattern value="automatic"/>
4160	        <xs:pattern value="moderator-controlled"/>
4161	        <xs:pattern value=".+"/>
4162	      </xs:restriction>
4163	    </xs:simpleType>

4165	    <!-- POLICY TYPE -->

4167	     <xs:simpleType name="policy-type">
4168	      <xs:restriction base="xs:string">
4169	        <xs:pattern value="allowed"/>
4170	        <xs:pattern value="disallowed"/>
4171	        <xs:pattern value=".+"/>
4172	      </xs:restriction>
4173	     </xs:simpleType>

4175	    <!-- CONTROL TYPE -->

4177	    <xs:complexType name="controls-type">
4178	      <xs:sequence>
4179	        <xs:element name="mute"
4180	          type="xs:boolean" minOccurs="0"/>
4181	        <xs:element name="pause-video"
4182	          type="xs:boolean" minOccurs="0"/>
4183	        <xs:element name="gain"
4184	          type="gain-type" minOccurs="0"/>
4185	        <xs:element name="video-layout"
4186	          type="video-layout-type" default="single-view" minOccurs="0"/>
4187	        <xs:any namespace="##other" processContents="lax"
4188	          minOccurs="0" maxOccurs="unbounded"/>
4189	      </xs:sequence>
4190	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4191	    </xs:complexType>

4193	    <!-- GAIN TYPE -->

4195	    <xs:simpleType name="gain-type">
4196	      <xs:restriction base="xs:integer">
4197	        <xs:minInclusive value="-127"/>
4198	        <xs:maxInclusive value="127"/>
4199	      </xs:restriction>
4200	    </xs:simpleType>

4202	    <!-- VIDEO LAYOUT TYPE -->

4204	    <xs:simpleType name="video-layout-type">
4205	      <xs:restriction base="xs:string">
4206	        <xs:pattern value="single-view"/>
4207	        <xs:pattern value="dual-view"/>
4208	        <xs:pattern value="dual-view-crop"/>
4209	        <xs:pattern value="dual-view-2x1"/>
4210	        <xs:pattern value="dual-view-2x1-crop"/>
4211	        <xs:pattern value="quad-view"/>
4212	        <xs:pattern value="multiple-3x3"/>
4213	        <xs:pattern value="multiple-4x4"/>

4215	        <xs:pattern value="multiple-5x1"/>
4216	        <xs:pattern value="automatic"/>
4217	        <xs:pattern value=".+"/>
4218	      </xs:restriction>
4219	    </xs:simpleType>

4221	    <!-- FLOOR INFORMATION TYPE -->

4223	    <xs:complexType name="floor-information-type">
4224	      <xs:sequence>
4225	        <xs:element name="conference-ID"
4226	          type="xs:unsignedLong" minOccurs="0"/>
4227	        <xs:element name="allow-floor-events"
4228	          type="xs:boolean" default="false" minOccurs="0"/>
4229	        <xs:element name="floor-request-handling"
4230	          type="floor-request-handling-type" minOccurs="0"/>
4231	        <xs:element name="conference-floor-policy"
4232	          type="conference-floor-policy" minOccurs="0"/>
4233	        <xs:any namespace="##other" processContents="lax"
4234	          minOccurs="0" maxOccurs="unbounded"/>
4235	      </xs:sequence>
4236	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4237	    </xs:complexType>

4239	    <!-- FLOOR REQUEST TYPE -->

4241	    <xs:simpleType name="floor-request-handling-type">
4242	      <xs:restriction base="xs:string">
4243	        <xs:pattern value="block"/>
4244	        <xs:pattern value="confirm"/>
4245	        <xs:pattern value=".+"/>
4246	      </xs:restriction>
4247	    </xs:simpleType>

4249	    <!-- CONFERENCE FLOOR POLICY -->

4251	    <xs:complexType name="conference-floor-policy">
4252	      <xs:sequence>
4253	        <xs:element name="floor" maxOccurs="unbounded">
4254	          <xs:complexType>
4255	            <xs:sequence>
4256	              <xs:element name="media-label"
4257	                type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
4258	              <xs:element name="algorithm"
4259	                type="algorithm-type" minOccurs="0"/>
4260	              <xs:element name="max-floor-users"
4261	                type="xs:nonNegativeInteger" minOccurs="0"/>
4262	              <xs:element name="moderator-id"
4263	                type="xs:nonNegativeInteger" minOccurs="0"/>
4264	                <xs:any namespace="##other" processContents="lax"
4265	                  minOccurs="0" maxOccurs="unbounded"/>
4266	            </xs:sequence>
4267	            <xs:attribute name="id" type="xs:string" use="required"/>
4268	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4269	          </xs:complexType>
4270	        </xs:element>
4271	      </xs:sequence>
4272	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4273	    </xs:complexType>

4275	    <!-- ALGORITHM TYPE -->

4277	    <xs:simpleType name="algorithm-type">
4278	      <xs:restriction base="xs:string">
4279	        <xs:pattern value="moderator-controlled"/>
4280	        <xs:pattern value="FCFS"/>
4281	        <xs:pattern value="random"/>
4282	        <xs:pattern value=".+"/>
4283	      </xs:restriction>
4284	    </xs:simpleType>

4286	    <!-- USER ADMISSION POLICY TYPE -->

4288	    <xs:simpleType name="user-admission-policy-type">
4289	      <xs:restriction base="xs:string">
4290	        <xs:pattern value="closedAuthenticated"/>
4291	        <xs:pattern value="openAuthenticated"/>
4292	        <xs:pattern value="anonymous"/>
4293	        <xs:pattern value=".+"/>
4294	      </xs:restriction>
4295	    </xs:simpleType>

4297	    <!-- JOIN HANDLING TYPE -->

4299	    <xs:simpleType name="join-handling-type">
4300	      <xs:restriction base="xs:string">
4301	        <xs:pattern value="block"/>
4302	        <xs:pattern value="confirm"/>
4303	        <xs:pattern value="allow"/>
4304	        <xs:pattern value="authenticate"/>
4305	        <xs:pattern value="directed-operator"/>
4306	        <xs:pattern value=".+"/>
4307	       </xs:restriction>
4308	    </xs:simpleType>

4310	   <!-- DENY USER LIST TYPE -->

4312	    <xs:complexType name="deny-users-list-type">
4313	      <xs:sequence>
4314	        <xs:element name="target" minOccurs="0" maxOccurs="unbounded">
4315	          <xs:complexType>
4316	            <xs:attribute name="uri" use="required" type="xs:anyURI"/>
4317	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4318	          </xs:complexType>
4319	        </xs:element>
4320	        <xs:any namespace="##other" processContents="lax"
4321	          minOccurs="0" maxOccurs="unbounded"/>
4322	      </xs:sequence>
4323	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4324	    </xs:complexType>

4326	     <!-- ALLOWED USERS LIST TYPE -->

4328	    <xs:complexType name="allowed-users-list-type">
4329	      <xs:sequence>
4330	        <xs:element name="target" type="target-type"
4331	          minOccurs="0" maxOccurs="unbounded">
4332	        </xs:element>
4333	        <xs:element name="persistent-list"
4334	          type="persistent-list-type"
4335	          minOccurs="0"/>
4336	        <xs:any namespace="##other" processContents="lax"
4337	          minOccurs="0" maxOccurs="unbounded"/>
4338	      </xs:sequence>
4339	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4340	    </xs:complexType>

4342	    <!-- PERSISTENT LIST TYPE -->

4344	    <xs:complexType name="persistent-list-type">
4345	      <xs:sequence>
4346	        <xs:element name="user" minOccurs="0" maxOccurs="unbounded">
4347	          <xs:complexType>
4348	            <xs:sequence>
4349	              <xs:element name="email" type="xs:string"
4350	                minOccurs="0" maxOccurs="unbounded"/>
4351	              <xs:any namespace="##other" processContents="lax"
4352	                minOccurs="0" maxOccurs="unbounded"/>
4353	            </xs:sequence>
4354	            <xs:attribute name="name"
4355	              use="required" type="xs:anyURI"/>
4356	            <xs:attribute name="nickname"
4357	              use="required" type="xs:string"/>
4358	            <xs:attribute name="id"
4359	              use="required" type="xs:string"/>
4360	            <xs:anyAttribute namespace="##any" processContents="lax"/>
4361	          </xs:complexType>
4362	        </xs:element>
4363	        <xs:any namespace="##other" processContents="lax"
4364	          minOccurs="0" maxOccurs="unbounded"/>
4365	      </xs:sequence>
4366	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4367	    </xs:complexType>

4369	    <!-- TARGET TYPE -->

4371	    <xs:complexType name="target-type">
4372	      <xs:attribute name="uri" use="required"
4373	        type="xs:anyURI"/>
4374	      <xs:attribute name="method" use="required"
4375	        type="method-type"/>
4376	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4377	    </xs:complexType>

4379	    <!-- METHOD TYPE -->

4381	    <xs:simpleType name="method-type">
4382	      <xs:restriction base="xs:string">
4383	        <xs:pattern value="dial-in"/>
4384	        <xs:pattern value="dial-out"/>
4385	        <xs:pattern value="refer"/>
4386	        <xs:pattern value=".+"/>
4387	      </xs:restriction>
4388	    </xs:simpleType>

4390	    <!-- ANONYMITY TYPE -->

4392	    <xs:simpleType name="provide-anonymity-type">
4393	      <xs:restriction base="xs:string">
4394	        <xs:pattern value="private"/>
4395	        <xs:pattern value="semi-private"/>
4396	        <xs:pattern value="hidden"/>
4397	        <xs:pattern value=".+"/>
4398	      </xs:restriction>
4399	    </xs:simpleType>

4401	    <!-- MIXER TYPE -->

4403	    <xs:complexType name="mixer-type">
4404	      <xs:sequence>
4405	        <xs:element name="floor">
4406	          <xs:complexType>
4407	            <xs:simpleContent>
4408	              <xs:extension base="xs:boolean">
4409	                <xs:attribute name="id" type="xs:string"
4410	                  use="required"/>
4411	                <xs:anyAttribute namespace="##any"
4412	                  processContents="lax"/>
4413	              </xs:extension>
4414	            </xs:simpleContent>
4415	          </xs:complexType>
4416	        </xs:element>
4417	        <xs:element name="controls" type="controls-type"
4418	          minOccurs="0" maxOccurs="unbounded"/>
4419	        <xs:any namespace="##other" processContents="lax"
4420	          minOccurs="0" maxOccurs="unbounded"/>
4421	      </xs:sequence>
4422	      <xs:attribute name="name" type="mixer-name-type"
4423	        use="required"/>
4424	      <xs:anyAttribute namespace="##any" processContents="lax"/>
4425	    </xs:complexType>

4427	    <!-- MIXER NAME TYPE -->

4429	    <xs:simpleType name="mixer-name-type">
4430	      <xs:restriction base="xs:string">
4431	        <xs:pattern value="VideoIn"/>
4432	        <xs:pattern value="VideoOut"/>
4433	        <xs:pattern value="AudioOut"/>
4434	        <xs:pattern value="AudioIn"/>
4435	        <xs:pattern value=".+"/>
4436	      </xs:restriction>
4437	    </xs:simpleType>

4439	  </xs:schema>

4441	Authors' Addresses

4443	   Oscar Novo
4444	   Ericsson
4445	   Hirsalantie 11
4446	   Jorvas  02420
4447	   Finland

4449	   Email: Oscar.Novo@ericsson.com

4451	   Gonzalo Camarillo
4452	   Ericsson
4453	   Hirsalantie 11
4454	   Jorvas  02420
4455	   Finland

4457	   Email: Gonzalo.Camarillo@ericsson.com

4459	   David P. Morgan
4460	   Fidelity Investments
4461	   82 Devonshire St, MZ V3C
4462	   Boston, MA  02109-3614
4463	   USA

4465	   Email: Dave.Morgan@fmr.com

4467	   Jari Urpalainen
4468	   Nokia
4469	   Itamerenkatu 11-13
4470	   Helsinki  00180
4471	   Finland

4473	   Phone: +358 7180 37686
4474	   Email: jari.urpalainen@nokia.com