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2	CLUE Working Group                                             R. Presta
3	Internet-Draft                                               S P. Romano
4	Intended status: Standards Track                    University of Napoli
5	Expires: December 31, 2015                                 June 29, 2015

7	                 An XML Schema for the CLUE data model
8	                  draft-ietf-clue-data-model-schema-10

10	Abstract

12	   This document provides an XML schema file for the definition of CLUE
13	   data model types.

15	Status of This Memo

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

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

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

30	   This Internet-Draft will expire on December 31, 2015.

32	Copyright Notice

34	   Copyright (c) 2015 IETF Trust and the persons identified as the
35	   document authors.  All rights reserved.

37	   This document is subject to BCP 78 and the IETF Trust's Legal
38	   Provisions Relating to IETF Documents
39	   (http://trustee.ietf.org/license-info) in effect on the date of
40	   publication of this document.  Please review these documents
41	   carefully, as they describe your rights and restrictions with respect
42	   to this document.  Code Components extracted from this document must
43	   include Simplified BSD License text as described in Section 4.e of
44	   the Trust Legal Provisions and are provided without warranty as
45	   described in the Simplified BSD License.

47	Table of Contents
48	   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
49	   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
50	   3.  XML Schema . . . . . . . . . . . . . . . . . . . . . . . . . .  6
51	   4.  <mediaCaptures>  . . . . . . . . . . . . . . . . . . . . . . . 17
52	   5.  <encodingGroups> . . . . . . . . . . . . . . . . . . . . . . . 17
53	   6.  <captureScenes>  . . . . . . . . . . . . . . . . . . . . . . . 17
54	   7.  <simultaneousSets> . . . . . . . . . . . . . . . . . . . . . . 17
55	   8.  <globalViews>  . . . . . . . . . . . . . . . . . . . . . . . . 18
56	   9.  <captureEncodings> . . . . . . . . . . . . . . . . . . . . . . 18
57	   10. <mediaCapture> . . . . . . . . . . . . . . . . . . . . . . . . 18
58	     10.1.  captureID attribute . . . . . . . . . . . . . . . . . . . 19
59	     10.2.  mediaType attribute . . . . . . . . . . . . . . . . . . . 20
60	     10.3.  <captureSceneIDREF> . . . . . . . . . . . . . . . . . . . 20
61	     10.4.  <encGroupIDREF> . . . . . . . . . . . . . . . . . . . . . 20
62	     10.5.  <spatialInformation>  . . . . . . . . . . . . . . . . . . 20
63	       10.5.1.  <captureOrigin> . . . . . . . . . . . . . . . . . . . 21
64	       10.5.2.  <captureArea> . . . . . . . . . . . . . . . . . . . . 22
65	     10.6.  <nonSpatiallyDefinable> . . . . . . . . . . . . . . . . . 23
66	     10.7.  <content> . . . . . . . . . . . . . . . . . . . . . . . . 23
67	     10.8.  <synchronizationID> . . . . . . . . . . . . . . . . . . . 24
68	     10.9.  <allowSubsetChoice> . . . . . . . . . . . . . . . . . . . 24
69	     10.10. <policy>  . . . . . . . . . . . . . . . . . . . . . . . . 24
70	     10.11. <maxCaptures> . . . . . . . . . . . . . . . . . . . . . . 25
71	     10.12. <individual>  . . . . . . . . . . . . . . . . . . . . . . 26
72	     10.13. <description> . . . . . . . . . . . . . . . . . . . . . . 26
73	     10.14. <priority>  . . . . . . . . . . . . . . . . . . . . . . . 27
74	     10.15. <lang>  . . . . . . . . . . . . . . . . . . . . . . . . . 27
75	     10.16. <mobility>  . . . . . . . . . . . . . . . . . . . . . . . 27
76	     10.17. <relatedTo> . . . . . . . . . . . . . . . . . . . . . . . 27
77	     10.18. <view>  . . . . . . . . . . . . . . . . . . . . . . . . . 28
78	     10.19. <presentation>  . . . . . . . . . . . . . . . . . . . . . 28
79	       10.19.1. <embeddedText>  . . . . . . . . . . . . . . . . . . . 28
80	       10.19.2. <capturedPeople>  . . . . . . . . . . . . . . . . . . 29
81	     10.20. Audio captures  . . . . . . . . . . . . . . . . . . . . . 29
82	       10.20.1. <sensitivityPattern>  . . . . . . . . . . . . . . . . 30
83	     10.21. Video captures  . . . . . . . . . . . . . . . . . . . . . 30
84	     10.22. Text captures . . . . . . . . . . . . . . . . . . . . . . 31
85	     10.23. Other capture types . . . . . . . . . . . . . . . . . . . 31
86	     10.24. <captureScene>  . . . . . . . . . . . . . . . . . . . . . 32
87	       10.24.1. <sceneInformation>  . . . . . . . . . . . . . . . . . 33
88	       10.24.2. <sceneViews>  . . . . . . . . . . . . . . . . . . . . 33
89	       10.24.3. sceneID attribute . . . . . . . . . . . . . . . . . . 33
90	       10.24.4. scale attribute . . . . . . . . . . . . . . . . . . . 33
91	     10.25. <sceneView> . . . . . . . . . . . . . . . . . . . . . . . 34
92	       10.25.1. <mediaCaptureIDs> . . . . . . . . . . . . . . . . . . 35
93	       10.25.2. sceneViewID attribute . . . . . . . . . . . . . . . . 35
94	     10.26. <encodingGroup> . . . . . . . . . . . . . . . . . . . . . 35
95	       10.26.1. <maxGroupBandwidth> . . . . . . . . . . . . . . . . . 36
96	       10.26.2. <encodingIDList>  . . . . . . . . . . . . . . . . . . 36
97	       10.26.3. encodingGroupID attribute . . . . . . . . . . . . . . 36
98	     10.27. <simultaneousSet> . . . . . . . . . . . . . . . . . . . . 36
99	       10.27.1. setID attribute . . . . . . . . . . . . . . . . . . . 37
100	       10.27.2. mediaType attribute . . . . . . . . . . . . . . . . . 37
101	       10.27.3. <mediaCaptureIDREF> . . . . . . . . . . . . . . . . . 38
102	       10.27.4. <sceneViewIDREF>  . . . . . . . . . . . . . . . . . . 38
103	       10.27.5. <captureSceneIDREF> . . . . . . . . . . . . . . . . . 38
104	     10.28. <globalView>  . . . . . . . . . . . . . . . . . . . . . . 38
105	     10.29. <people>  . . . . . . . . . . . . . . . . . . . . . . . . 38
106	       10.29.1. <person>  . . . . . . . . . . . . . . . . . . . . . . 39
107	   11. <captureEncoding>  . . . . . . . . . . . . . . . . . . . . . . 40
108	     11.1.  <captureID> . . . . . . . . . . . . . . . . . . . . . . . 41
109	     11.2.  <encodingID>  . . . . . . . . . . . . . . . . . . . . . . 41
110	     11.3.  <configuredContent> . . . . . . . . . . . . . . . . . . . 41
111	   12. <clueInfo> . . . . . . . . . . . . . . . . . . . . . . . . . . 41
112	   13. XML Schema extensibility . . . . . . . . . . . . . . . . . . . 42
113	     13.1.  Example of extension  . . . . . . . . . . . . . . . . . . 43
114	   14. Security considerations  . . . . . . . . . . . . . . . . . . . 44
115	   15. IANA considerations  . . . . . . . . . . . . . . . . . . . . . 45
116	     15.1.  XML namespace registration  . . . . . . . . . . . . . . . 45
117	     15.2.  XML Schema registration . . . . . . . . . . . . . . . . . 46
118	     15.3.  MIME Media Type Registration for
119	            'application/clue_info+xml' . . . . . . . . . . . . . . . 46
120	   16. Sample XML file  . . . . . . . . . . . . . . . . . . . . . . . 47
121	   17. MCC example  . . . . . . . . . . . . . . . . . . . . . . . . . 54
122	   18. Diff with draft-ietf-clue-data-model-schema-09 version . . . . 60
123	   19. Diff with draft-ietf-clue-data-model-schema-08 version . . . . 61
124	   20. Diff with draft-ietf-clue-data-model-schema-07 version . . . . 61
125	   21. Diff with draft-ietf-clue-data-model-schema-06 version . . . . 61
126	   22. Diff with draft-ietf-clue-data-model-schema-04 version . . . . 62
127	   23. Diff with draft-ietf-clue-data-model-schema-03 version . . . . 62
128	   24. Diff with  draft-ietf-clue-data-model-schema-02 version  . . . 63
129	   25. Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 63
130	   26. Informative References . . . . . . . . . . . . . . . . . . . . 63

132	1.  Introduction

134	   This document provides an XML schema file for the definition of CLUE
135	   data model types.

137	   The schema is based on information contained in
138	   [I-D.ietf-clue-framework].  It encodes information and constraints
139	   defined in the aforementioned document in order to provide a formal
140	   representation of the concepts therein presented.

142	   The document aims at the definition of a coherent structure for
143	   information associated with the description of a telepresence
144	   scenario.  Such information is used within the CLUE protocol messages
145	   ([I-D.ietf-clue-protocol]) enabling the dialogue between a Media
146	   Provider and a Media Consumer.  CLUE protocol messages, indeed, are
147	   XML messages allowing (i) a Media Provider to advertise its
148	   telepresence capabilities in terms of media captures, capture scenes,
149	   and other features envisioned in the CLUE framework, according to the
150	   format herein defined and (ii) a Media Consumer to request the
151	   desired telepresence options in the form of capture encodings,
152	   represented as described in this document.

154	2.  Terminology

156	   This document refers to the same terminology used in
157	   [I-D.ietf-clue-framework], except for the "CLUE Participant"
158	   definition.  We briefly recall herein some of the main terms used in
159	   the document.

161	   Audio Capture:  Media Capture for audio.  Denoted as ACn in the
162	      examples in this document.

164	   Capture:  Same as Media Capture.

166	   Capture Device:  A device that converts physical input, such as
167	      audio, video or text, into an electrical signal, in most cases to
168	      be fed into a media encoder.

170	   Capture Encoding:  A specific encoding of a Media Capture, to be sent
171	      by a Media Provider to a Media Consumer via RTP.

173	   Capture Scene:  A structure representing a spatial region captured by
174	      one or more Capture Devices, each capturing media representing a
175	      portion of the region.  The spatial region represented by a
176	      Capture Scene MAY correspond to a real region in physical space,
177	      such as a room.  A Capture Scene includes attributes and one or
178	      more Capture Scene Views, with each view including one or more
179	      Media Captures.

181	   Capture Scene View:  A list of Media Captures of the same media type
182	      that together form one way to represent the entire Capture Scene..

184	   CLUE Participant:  This term is not imported from the framework
185	      terminology.  A CLUE Participant identifies a generic entity
186	      (either an Endpoint or a MCU) making use of the CLUE protocol.

188	   Consumer:  Short for Media Consumer.

190	   Encoding or Individual Encoding:  A set of parameters representing a
191	      way to encode a Media Capture to become a Capture Encoding.

193	   Encoding Group:  A set of encoding parameters representing a total
194	      media encoding capability to be sub-divided across potentially
195	      multiple Individual Encodings.

197	   Endpoint  A CLUE-capable device which is the logical point of final
198	      termination through receiving, decoding and rendering, and/or
199	      initiation through capturing, encoding, and sending of media
200	      streams.  An endpoint consists of one or more physical devices
201	      which source and sink media streams, and exactly one [RFC4353]
202	      Participant (which, in turn, includes exactly one SIP User Agent).
203	      Endpoints can be anything from multiscreen/multicamera rooms to
204	      handheld devices.

206	   Media:  Any data that, after suitable encoding, can be conveyed over
207	      RTP, including audio, video or timed text.

209	   Media Capture:  A source of Media, such as from one or more Capture
210	      Devices or constructed from other Media streams.

212	   Media Consumer:  A CLUE-capable device that intends to receive
213	      Capture Encodings.

215	   Media Provider:  A CLUE-capable device that intends to send Capture
216	      Encodings.

218	   Multiple Content Capture:  A Capture that mixes and/or switches other
219	      Captures of a single type.  (E.g. all audio or all video.)
220	      Particular Media Captures may or may not be present in the
221	      resultant Capture Encoding depending on time or space.  Denoted as
222	      MCCn in the example cases in this document.

224	   Multipoint Control Unit (MCU):  A CLUE-capable device that connects
225	      two or more endpoints together into one single multimedia
226	      conference [RFC5117].  An MCU includes an [RFC4353] like Mixer,
227	      without the [RFC4353] requirement to send media to each
228	      participant.

230	   Plane of Interest:  The spatial plane containing the most relevant
231	      Subject matter.

233	   Provider:  Same as Media Provider.

235	   Render:   The process of reproducing the received Streams like, for
236	      instance, displaying of the remote video on the Media Consumer's
237	      screens, or playing of the remote audio through loudspeakers.

239	   Scene:  Same as Capture Scene.

241	   Simultaneous Transmission Set:  A set of Media Captures that can be
242	      transmitted simultaneously from a Media Provider.

244	   Single Media Capture:  A capture which contains media from a single
245	      source capture device, e.g. an audio capture from a single
246	      microphone, a video capture from a single camera.

248	   Spatial Relation:  The arrangement in space of two objects, in
249	      contrast to relation in time or other relationships.

251	   Stream:  A Capture Encoding sent from a Media Provider to a Media
252	      Consumer via RTP [RFC3550].

254	   Stream Characteristics:  The union of the features used to describe a
255	      Stream in the CLUE environment and in the SIP-SDP environment.

257	   Video Capture:  A Media Capture for video.

259	3.  XML Schema

261	   This section contains the CLUE data model schema definition.

263	   The element and attribute definitions are formal representations of
264	   the concepts needed to describe the capabilities of a Media Provider
265	   and the streams that are requested by a Media Consumer given the
266	   Media Provider's ADVERTISEMENT ([I-D.ietf-clue-protocol]).

268	   The main groups of information are:

270	      <mediaCaptures>: the list of media captures available (Section 4)

272	      <encodingGroups>: the list of encoding groups (Section 5)

274	      <captureScenes>: the list of capture scenes (Section 6)

276	      <simultaneousSets>: the list of simultaneous transmission sets
277	      (Section 7)
278	      <globalViews>: the list of global views sets (Section 8)

280	      <people>: meta data about the participants represented in the
281	      telepresence session (Section 10.29).

283	      <captureEncodings>: the list of instantiated capture encodings
284	      (Section 9)

286	   All of the above refers to concepts that have been introduced in
287	   [I-D.ietf-clue-framework] and further detailed in this document.

289	<?xml version="1.0" encoding="UTF-8" ?>
290	<xs:schema
291	   targetNamespace="urn:ietf:params:xml:ns:clue-info"
292	   xmlns:tns="urn:ietf:params:xml:ns:clue-info"
293	   xmlns:xs="http://www.w3.org/2001/XMLSchema"
294	   xmlns="urn:ietf:params:xml:ns:clue-info"
295	   xmlns:xcard="urn:ietf:params:xml:ns:vcard-4.0"
296	   elementFormDefault="qualified"
297	   attributeFormDefault="unqualified"
298	   version="1.0">

300	<!-- Import xcard XML schema -->
301	<xs:import namespace="urn:ietf:params:xml:ns:vcard-4.0"
302	schemaLocation="xcard.xsd"/>

304	<!-- ELEMENT DEFINITIONS -->
305	<xs:element name="mediaCaptures" type="mediaCapturesType"/>
306	<xs:element name="encodingGroups" type="encodingGroupsType"/>
307	<xs:element name="captureScenes" type="captureScenesType"/>
308	<xs:element name="simultaneousSets" type="simultaneousSetsType"/>
309	<xs:element name="globalViews" type="globalViewsType"/>
310	<xs:element name="people" type="peopleType"/>

312	<xs:element name="captureEncodings" type="captureEncodingsType"/>

314	<!-- MEDIA CAPTURES TYPE -->
315	<!-- envelope of media captures -->
316	<xs:complexType name="mediaCapturesType">
317	 <xs:sequence>
318	   <xs:element name="mediaCapture" type="mediaCaptureType"
319	   maxOccurs="unbounded"/>
320	 </xs:sequence>
321	</xs:complexType>
322	<!-- DESCRIPTION element -->
323	<xs:element name="description">
324	 <xs:complexType>
325	  <xs:simpleContent>
326	   <xs:extension base="xs:string">
327	     <xs:attribute name="lang" type="xs:language"/>
328	   </xs:extension>
329	  </xs:simpleContent>
330	 </xs:complexType>
331	</xs:element>

333	<!-- MEDIA CAPTURE TYPE -->
334	<xs:complexType name="mediaCaptureType" abstract="true">
335	  <xs:sequence>
336	    <!-- mandatory fields -->
337	    <xs:element name="captureSceneIDREF" type="xs:IDREF"/>
338	    <xs:choice>
339	      <xs:sequence>
340	        <xs:element name="spatialInformation"
341	                    type="tns:spatialInformationType"/>
342	      </xs:sequence>
343	      <xs:element name="nonSpatiallyDefinable" type="xs:boolean" fixed="true"/>
344	    </xs:choice>
345	    <!-- for handling multi-content captures: -->
346	    <xs:choice>
347	      <xs:sequence>
348	        <xs:element name="synchronizationID" type="xs:ID" minOccurs="0"/>
349	        <xs:element name="content" type="contentType" minOccurs="0"/>
350	        <xs:element name="policy" type="policyType" minOccurs="0"/>
351	        <xs:element name="maxCaptures" type="maxCapturesType" minOccurs="0"/>
352	        <xs:element name="allowSubsetChoice" type="xs:boolean" minOccurs="0"/>
353	      </xs:sequence>
354	      <xs:element name="individual" type="xs:boolean" fixed="true"/>
355	    </xs:choice>
356	    <!-- optional fields -->
357	    <xs:element name="encGroupIDREF" type="xs:IDREF" minOccurs="0"/>
358	    <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
359	    <xs:element name="priority" type="xs:unsignedInt" minOccurs="0"/>
360	    <xs:element name="lang" type="xs:language" minOccurs="0"
361	     maxOccurs="unbounded"/>
362	    <xs:element name="mobility" type="mobilityType" minOccurs="0"/>
363	    <xs:element name="presentation" type="presentationType" minOccurs="0"/>
364	    <xs:element ref="embeddedText" minOccurs="0"/>
365	    <xs:element name="view" type="viewType" minOccurs="0"/>
366	    <xs:element name="capturedPeople" type="capturedPeopleType" minOccurs="0"/>
367	    <xs:element name="relatedTo" type="xs:IDREF" minOccurs="0"/>
368	  </xs:sequence>
369	  <xs:attribute name="captureID" type="xs:ID" use="required"/>
370	  <xs:attribute name="mediaType" type="xs:string" use="required"/>

372	</xs:complexType>

374	<!-- POLICY TYPE -->
375	<xs:simpleType name="policyType">
376	 <xs:restriction base="xs:string">
377	      <xs:pattern value="([a-zA-Z0-9])+[:]([0-9])+"/>
378	    </xs:restriction>
379	</xs:simpleType>

381	<!-- CONTENT TYPE -->
382	<xs:complexType name="contentType">
383	 <xs:sequence>
384	   <xs:element name="captureIDREF" type="xs:IDREF"
385	   minOccurs="0" maxOccurs="unbounded"/>
386	   <xs:element name="sceneViewIDREF" type="xs:IDREF"
387	   minOccurs="0" maxOccurs="unbounded"/>
388	   <xs:any namespace="##other" processContents="lax" minOccurs="0"
389	   maxOccurs="unbounded"/>
390	 </xs:sequence>
391	 <xs:anyAttribute namespace="##other" processContents="lax"/>
392	</xs:complexType>

394	<!-- MAX CAPTURES TYPE -->
395	<xs:complexType name="maxCapturesType">
396	  <xs:simpleContent>
397	    <xs:extension base="xs:positiveInteger">
398	      <xs:attribute name="exactNumber" type="xs:boolean"/>
399	    </xs:extension>
400	  </xs:simpleContent>
401	</xs:complexType>

403	<!-- CAPTURED PEOPLE TYPE -->
404	<xs:complexType name="capturedPeopleType">
405	<xs:sequence>
406	<xs:element name="personIDREF" type="xs:IDREF" maxOccurs="unbounded"/>
407	</xs:sequence>
408	</xs:complexType>

410	<!-- PEOPLE TYPE -->
411	<xs:complexType name="peopleType">
412	<xs:sequence>
413	<xs:element name="person" type="personType"
414	                    maxOccurs="unbounded"/>
415	</xs:sequence>
416	</xs:complexType>
417	<!-- PERSON TYPE -->
418	<xs:complexType name="personType">
419	  <xs:sequence>
420	     <xs:element name="personInfo" type="xcard:vcardType" maxOccurs="1"
421	                         minOccurs="0"/>
422	     <xs:element name="personType" type="personTypeType"
423	                         minOccurs="0"
424	                 maxOccurs="unbounded"/>
425	     <xs:any namespace="##other" processContents="lax" minOccurs="0"
426	                 maxOccurs="unbounded"/>
427	  </xs:sequence>
428	  <xs:attribute name="personID" type="xs:ID" use="required"/>
429	  <xs:anyAttribute namespace="##other" processContents="lax"/>
430	</xs:complexType>

432	<!-- PERSON TYPE TYPE -->
433	<xs:simpleType name="personTypeType">
434	        <xs:restriction base="xs:string">
435	        <xs:enumeration value="chairman"/>
436	        <xs:enumeration value="vice-chairman"/>
437	        <xs:enumeration value="minute taker"/>
438	        <xs:enumeration value="presenter"/>
439	        <xs:enumeration value="translator"/>
440	        <xs:enumeration value="timekeeper"/>
441	        <xs:enumeration value="attendee"/>
442	        <xs:enumeration value="observer"/>
443	        </xs:restriction>
444	</xs:simpleType>

446	<!-- VIEW TYPE -->
447	<xs:simpleType name="viewType">
448	 <xs:restriction base="xs:string">
449	  <xs:enumeration value="room"/>
450	  <xs:enumeration value="table"/>
451	  <xs:enumeration value="lectern"/>
452	  <xs:enumeration value="individual"/>
453	  <xs:enumeration value="audience"/>
454	 </xs:restriction>
455	</xs:simpleType>

457	<!-- PRESENTATION TYPE -->
458	<xs:simpleType name="presentationType">
459	 <xs:restriction base="xs:string">
460	  <xs:enumeration value="slides"/>
461	  <xs:enumeration value="image"/>
462	 </xs:restriction>
463	</xs:simpleType>
464	<!-- SPATIAL INFORMATION TYPE -->
465	<xs:complexType name="spatialInformationType">
466	 <xs:sequence>
467	  <xs:element name="captureOrigin" type="captureOriginType" minOccurs="0"/>
468	  <xs:element name="captureArea" type="captureAreaType" minOccurs="0"/>
469	  <xs:any namespace="##other" processContents="lax" minOccurs="0"
470	  maxOccurs="unbounded"/>
471	 </xs:sequence>
472	 <xs:anyAttribute namespace="##other" processContents="lax"/>
473	</xs:complexType>

475	<!-- POINT TYPE -->
476	<xs:complexType name="pointType">
477	 <xs:sequence>
478	  <xs:element name="x" type="xs:decimal"/>
479	  <xs:element name="y" type="xs:decimal"/>
480	  <xs:element name="z" type="xs:decimal"/>
481	 </xs:sequence>
482	</xs:complexType>

484	<!-- CAPTURE ORIGIN TYPE -->
485	<xs:complexType name="captureOriginType">
486	  <xs:sequence>
487	        <xs:element name="capturePoint" type="pointType"></xs:element>
488	        <xs:element name="lineOfCapturePoint" type="pointType" minOccurs="0"></xs:element>
489	  </xs:sequence>
490	  <xs:anyAttribute namespace="##any" processContents="lax"/>
491	</xs:complexType>

493	<!-- CAPTURE AREA TYPE -->
494	<xs:complexType name="captureAreaType">
495	 <xs:sequence>
496	  <xs:element name="bottomLeft" type="pointType"/>
497	  <xs:element name="bottomRight" type="pointType"/>
498	  <xs:element name="topLeft" type="pointType"/>
499	  <xs:element name="topRight" type="pointType"/>
500	 </xs:sequence>
501	</xs:complexType>

503	<!-- MOBILITY TYPE -->
504	<xs:simpleType name="mobilityType">
505	 <xs:restriction base="xs:string">
506	  <xs:enumeration value="static"/>
507	  <xs:enumeration value="dynamic"/>
508	  <xs:enumeration value="highly-dynamic"/>

510	 </xs:restriction>
511	</xs:simpleType>

513	<!-- TEXT CAPTURE TYPE -->
514	<xs:complexType name="textCaptureType">
515	 <xs:complexContent>
516	  <xs:extension base="tns:mediaCaptureType">
517	  <xs:sequence>
518	  <xs:any namespace="##other" processContents="lax" minOccurs="0"
519	    maxOccurs="unbounded"/>
520	  </xs:sequence>
521	  <xs:anyAttribute namespace="##other" processContents="lax"/>
522	  </xs:extension>
523	 </xs:complexContent>
524	</xs:complexType>

526	<!-- OTHER CAPTURE TYPE -->
527	<xs:complexType name="otherCaptureType">
528	 <xs:complexContent>
529	  <xs:extension base="tns:mediaCaptureType">
530	  <xs:sequence>
531	  <xs:any namespace="##other" processContents="lax" minOccurs="0"
532	    maxOccurs="unbounded"/>
533	  </xs:sequence>
534	  <xs:anyAttribute namespace="##other" processContents="lax"/>
535	  </xs:extension>
536	 </xs:complexContent>
537	</xs:complexType>

539	<!-- AUDIO CAPTURE TYPE -->
540	<xs:complexType name="audioCaptureType">
541	 <xs:complexContent>
542	  <xs:extension base="tns:mediaCaptureType">
543	   <xs:sequence>
544	    <xs:element name="sensitivyPattern" type="sensitivyPatternType"
545	    minOccurs="0"/>
546	    <xs:any namespace="##other" processContents="lax" minOccurs="0"
547	    maxOccurs="unbounded"/>
548	   </xs:sequence>
549	   <xs:anyAttribute namespace="##other" processContents="lax"/>
550	  </xs:extension>
551	 </xs:complexContent>
552	</xs:complexType>

554	<!-- SENSITIVITY PATTERN TYPE -->
555	<xs:simpleType name="sensitivyPatternType">
556	 <xs:restriction base="xs:string">
557	  <xs:enumeration value="uni"/>
558	  <xs:enumeration value="shotgun"/>
559	  <xs:enumeration value="omni"/>
560	  <xs:enumeration value="figure8"/>
561	  <xs:enumeration value="cardioid"/>
562	  <xs:enumeration value="hyper-cardioid"/>
563	 </xs:restriction>
564	</xs:simpleType>

566	<!-- VIDEO CAPTURE TYPE -->
567	<xs:complexType name="videoCaptureType">
568	 <xs:complexContent>
569	  <xs:extension base="tns:mediaCaptureType">
570	   <xs:sequence>
571	    <xs:any namespace="##other" processContents="lax" minOccurs="0"
572	    maxOccurs="unbounded"/>
573	   </xs:sequence>
574	   <xs:anyAttribute namespace="##other" processContents="lax"/>
575	  </xs:extension>
576	 </xs:complexContent>
577	</xs:complexType>

579	<!-- EMBEDDED TEXT ELEMENT -->
580	<xs:element name="embeddedText">
581	 <xs:complexType>
582	  <xs:simpleContent>
583	   <xs:extension base="xs:boolean">
584	    <xs:attribute name="lang" type="xs:language"/>
585	   </xs:extension>
586	  </xs:simpleContent>
587	 </xs:complexType>
588	</xs:element>

590	<!-- CAPTURE SCENES TYPE -->
591	<!-- envelope of capture scenes -->
592	<xs:complexType name="captureScenesType">
593	 <xs:sequence>
594	  <xs:element name="captureScene" type="captureSceneType"
595	  maxOccurs="unbounded"/>
596	 </xs:sequence>
597	</xs:complexType>

599	<!-- CAPTURE SCENE TYPE -->
600	<xs:complexType name="captureSceneType">
601	 <xs:sequence>
602	  <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
603	  <xs:element name="sceneInformation" type="xcard:vcardType" minOccurs="0"/>
604	  <xs:element name="sceneViews" type="sceneViewsType" minOccurs="0"/>
605	  <xs:any namespace="##other" processContents="lax" minOccurs="0"
606	  maxOccurs="unbounded"/>
607	 </xs:sequence>
608	 <xs:attribute name="sceneID" type="xs:ID" use="required"/>
609	 <xs:attribute name="scale" type="scaleType" use="required"/>
610	 <xs:anyAttribute namespace="##other" processContents="lax"/>
611	</xs:complexType>

613	<!-- SCALE TYPE -->
614	<xs:simpleType name="scaleType">
615	 <xs:restriction base="xs:string">
616	  <xs:enumeration value="mm"/>
617	  <xs:enumeration value="unknown"/>
618	  <xs:enumeration value="noscale"/>
619	 </xs:restriction>
620	</xs:simpleType>

622	<!-- SCENE VIEWS TYPE -->
623	<!-- envelope of scene views of a capture scene -->
624	<xs:complexType name="sceneViewsType">
625	 <xs:sequence>
626	  <xs:element name="sceneView" type="sceneViewType"
627	  maxOccurs="unbounded"/>
628	 </xs:sequence>
629	</xs:complexType>

631	<!-- SCENE VIEW TYPE -->
632	<xs:complexType name="sceneViewType">
633	 <xs:sequence>
634	  <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
635	  <xs:element name="mediaCaptureIDs" type="captureIDListType"/>
636	 </xs:sequence>
637	 <xs:attribute name="sceneViewID" type="xs:ID" use="required"/>
638	</xs:complexType>

640	<!-- CAPTURE ID LIST TYPE -->
641	<xs:complexType name="captureIDListType">
642	 <xs:sequence>
643	  <xs:element name="captureIDREF" type="xs:IDREF"
644	  maxOccurs="unbounded"/>
645	 </xs:sequence>
646	</xs:complexType>
647	<!-- ENCODING GROUPS TYPE -->
648	<xs:complexType name="encodingGroupsType">
649	 <xs:sequence>
650	  <xs:element name="encodingGroup" type="tns:encodingGroupType"
651	  maxOccurs="unbounded"/>
652	 </xs:sequence>
653	</xs:complexType>

655	<!-- ENCODING GROUP TYPE -->
656	<xs:complexType name="encodingGroupType">
657	 <xs:sequence>
658	  <xs:element name="maxGroupBandwidth" type="xs:unsignedLong"/>
659	  <xs:element name="encodingIDList" type="encodingIDListType"/>
660	  <xs:any namespace="##other" processContents="lax" minOccurs="0"
661	  maxOccurs="unbounded"/>
662	 </xs:sequence>
663	 <xs:attribute name="encodingGroupID" type="xs:ID" use="required"/>
664	 <xs:anyAttribute namespace="##any" processContents="lax"/>
665	</xs:complexType>

667	<!-- ENCODING ID LIST TYPE -->
668	<xs:complexType name="encodingIDListType">
669	 <xs:sequence>
670	  <xs:element name="encID" type="xs:string" maxOccurs="unbounded"/>
671	 </xs:sequence>
672	</xs:complexType>

674	<!-- SIMULTANEOUS SETS TYPE -->
675	<xs:complexType name="simultaneousSetsType">
676	 <xs:sequence>
677	  <xs:element name="simultaneousSet" type="simultaneousSetType"
678	  maxOccurs="unbounded"/>
679	 </xs:sequence>
680	</xs:complexType>

682	<!-- SIMULTANEOUS SET TYPE -->
683	<xs:complexType name="simultaneousSetType">
684	 <xs:sequence>
685	   <xs:element name="mediaCaptureIDREF" type="xs:IDREF"
686	   minOccurs="0" maxOccurs="unbounded"/>
687	   <xs:element name="sceneViewIDREF" type="xs:IDREF"
688	   minOccurs="0" maxOccurs="unbounded"/>
689	   <xs:element name="captureSceneIDREF" type="xs:IDREF"
690	   minOccurs="0" maxOccurs="unbounded"/>
691	   <xs:any namespace="##other" processContents="lax" minOccurs="0"
692	   maxOccurs="unbounded"/>
693	 </xs:sequence>
694	 <xs:attribute name="setID" type="xs:ID" use="required"/>
695	 <xs:attribute name="mediaType" type="xs:string"/>
696	 <xs:anyAttribute namespace="##any" processContents="lax"/>
697	</xs:complexType>

699	<!-- GLOBAL VIEWS TYPE -->
700	<xs:complexType name="globalViewsType">
701	 <xs:sequence>
702	  <xs:element name="globalView" type="globalViewType"
703	  maxOccurs="unbounded"/>
704	 </xs:sequence>
705	</xs:complexType>

707	<!-- GLOBAL VIEW TYPE -->
708	<xs:complexType name="globalViewType">
709	 <xs:sequence>
710	   <xs:element name="sceneViewIDREF" type="xs:IDREF"
711	    maxOccurs="unbounded"/>
712	   <xs:any namespace="##other" processContents="lax" minOccurs="0"
713	   maxOccurs="unbounded"/>
714	 </xs:sequence>
715	 <xs:attribute name="globalViewID" type="xs:ID"/>
716	 <xs:anyAttribute namespace="##any" processContents="lax"/>
717	</xs:complexType>

719	<!-- CAPTURE ENCODINGS TYPE -->
720	<xs:complexType name="captureEncodingsType">
721	 <xs:sequence>
722	  <xs:element name="captureEncoding" type="captureEncodingType"
723	  maxOccurs="unbounded"/>
724	 </xs:sequence>
725	</xs:complexType>

727	<!-- CAPTURE ENCODING TYPE -->
728	<xs:complexType name="captureEncodingType">
729	 <xs:sequence>
730	  <xs:element name="captureID" type="xs:string"/>
731	  <xs:element name="encodingID" type="xs:string"/>
732	  <xs:element name="configuredContent" type="contentType" minOccurs="0"/>
733	  <xs:any namespace="##other" processContents="lax" minOccurs="0"
734	   maxOccurs="unbounded"/>
735	 </xs:sequence>
736	 <xs:attribute name="ID" type="xs:ID" use="required"/>
737	 <xs:anyAttribute namespace="##any" processContents="lax"/>
738	</xs:complexType>

740	<!-- CLUE INFO ELEMENT -->
741	<xs:element name="clueInfo" type="clueInfoType"/>
742	<!-- CLUE INFO TYPE -->
743	<xs:complexType name="clueInfoType">
744	  <xs:sequence>
745	   <xs:element ref="mediaCaptures"/>
746	   <xs:element ref="encodingGroups"/>
747	   <xs:element ref="captureScenes"/>
748	   <xs:element ref="simultaneousSets" minOccurs="0"/>
749	   <xs:element ref="globalViews" minOccurs="0"/>
750	   <xs:element ref="people" minOccurs="0"/>
751	   <xs:any namespace="##other" processContents="lax" minOccurs="0"
752	   maxOccurs="unbounded"/>
753	  </xs:sequence>
754	  <xs:attribute name="clueInfoID" type="xs:ID" use="required"/>
755	  <xs:anyAttribute namespace="##other" processContents="lax"/>
756	</xs:complexType>
757	</xs:schema>

759	   Following sections describe the XML schema in more detail.  As a
760	   general remark, please notice that optional elements that don't
761	   define what their absence means are intended to be associated with
762	   undefined properties.

764	4.  <mediaCaptures>

766	   <mediaCaptures> represents the list of one or more media captures
767	   available at the Media Provider's side.  Each media capture is
768	   represented by a <mediaCapture> element (Section 10).

770	5.  <encodingGroups>

772	   <encodingGroups> represents the list of the encoding groups organized
773	   on the Media Provider's side.  Each encoding group is represented by
774	   an <encodingGroup> element (Section 10.26).

776	6.  <captureScenes>

778	   <captureScenes> represents the list of the capture scenes organized
779	   on the Media Provider's side.  Each capture scene is represented by a
780	   <captureScene> element.  (Section 10.24).

782	7.  <simultaneousSets>

784	   <simultaneousSets> contains the simultaneous sets indicated by the
785	   Media Provider.  Each simultaneous set is represented by a
786	   <simultaneousSet> element.  (Section 10.27).

788	8.  <globalViews>

790	   <globalViews> contains a set of alternative representations of all
791	   the scenes that are offered by a Media Provider to a Media Consumer.
792	   Each alternative is named "global view" and it is represented by a
793	   <globalView> element.  (Section 10.28).

795	9.  <captureEncodings>

797	   <captureEncodings> is a list of capture encodings.  It can represent
798	   the list of the desired capture encodings indicated by the Media
799	   Consumer or the list of instantiated captures on the provider's side.
800	   Each capture encoding is represented by a <captureEncoding> element.
801	   (Section 11).

803	10.  <mediaCapture>

805	   A Media Capture is the fundamental representation of a media flow
806	   that is available on the provider's side.  Media captures are
807	   characterized (i) by a set of features that are independent from the
808	   specific type of medium, and (ii) by a set of features that are
809	   media-specific.  The features that are common to all media types
810	   appear within the media capture type, that has been designed as an
811	   abstract complex type.  Media-specific captures, such as video
812	   captures, audio captures and others, are specializations of that
813	   abstract media capture type, as in a typical generalization-
814	   specialization hierarchy.

816	   The following is the XML Schema definition of the media capture type:

818	<!-- MEDIA CAPTURE TYPE -->
819	<xs:complexType name="mediaCaptureType" abstract="true">
820	  <xs:sequence>
821	    <!-- mandatory fields -->
822	    <xs:element name="captureSceneIDREF" type="xs:IDREF"/>
823	    <xs:choice>
824	      <xs:sequence>
825	        <xs:element name="spatialInformation"
826	                    type="tns:spatialInformationType"/>
827	      </xs:sequence>
828	      <xs:element name="nonSpatiallyDefinable" type="xs:boolean" fixed="true"/>
829	    </xs:choice>
830	    <!-- for handling multi-content captures: -->
831	    <xs:choice>
832	      <xs:sequence>
833	        <xs:element name="synchronizationID" type="xs:ID" minOccurs="0"/>
834	        <xs:element name="content" type="contentType" minOccurs="0"/>
835	        <xs:element name="policy" type="policyType" minOccurs="0"/>
836	        <xs:element name="maxCaptures" type="maxCapturesType" minOccurs="0"/>
837	        <xs:element name="allowSubsetChoice" type="xs:boolean" minOccurs="0"/>
838	      </xs:sequence>
839	      <xs:element name="individual" type="xs:boolean" fixed="true"/>
840	    </xs:choice>
841	    <!-- optional fields -->
842	    <xs:element name="encGroupIDREF" type="xs:IDREF" minOccurs="0"/>
843	    <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
844	    <xs:element name="priority" type="xs:unsignedInt" minOccurs="0"/>
845	    <xs:element name="lang" type="xs:language" minOccurs="0"
846	     maxOccurs="unbounded"/>
847	    <xs:element name="mobility" type="mobilityType" minOccurs="0"/>
848	    <xs:element name="presentation" type="presentationType" minOccurs="0"/>
849	    <xs:element ref="embeddedText" minOccurs="0"/>
850	    <xs:element name="view" type="viewType" minOccurs="0"/>
851	    <xs:element name="capturedPeople" type="capturedPeopleType" minOccurs="0"/>
852	    <xs:element name="relatedTo" type="xs:IDREF" minOccurs="0"/>
853	  </xs:sequence>
854	  <xs:attribute name="captureID" type="xs:ID" use="required"/>
855	  <xs:attribute name="mediaType" type="xs:string" use="required"/>
856	</xs:complexType>

858	10.1.  captureID attribute

860	   The "captureID" attribute is a mandatory field containing the
861	   identifier of the media capture.  Such an identifier serves as the
862	   way the capture is referenced from other data model elements (e.g.,
863	   simultaneous sets, capture encodings, and others).

865	10.2.  mediaType attribute

867	   The "mediaType" attribute is a mandatory attribute specifying the
868	   media type of the capture.  Common values are "audio", "video",
869	   "text".  Other values can be provided.  It is assumed that
870	   implementations agree on the interpretation of those other values.

872	10.3.  <captureSceneIDREF>

874	   <captureSceneIDREF> is a mandatory field containing the value of the
875	   identifier of the capture scene the media capture is defined in,
876	   i.e., the value of the sceneID (Section 10.24.3) attribute of that
877	   capture scene.  Indeed, each media capture must be defined within one
878	   and only one capture scene.  When a media capture is spatially
879	   definable, some spatial information is provided along with it in the
880	   form of point coordinates (see Section 10.5).  Such coordinates refer
881	   to the space of coordinates defined for the capture scene containing
882	   the capture.

884	10.4.  <encGroupIDREF>

886	   <encGroupIDREF> is an optional field containing the identifier of the
887	   encoding group the media capture is associated with, i.e., the value
888	   of the encodingGroupID (Section 10.26.3) attribute of that encoding
889	   group.  Media captures that are not associated with any encoding
890	   group can not be instantiated as media streams.

892	10.5.  <spatialInformation>

894	   Media captures are divided into two categories: (i) non spatially
895	   definable captures and (ii) spatially definable captures.

897	   Captures are spatially definable when at least (i) it is possible to
898	   provide the coordinates of the device position within the
899	   telepresence room of origin (capture point) together with its
900	   capturing direction specified by a second point (point on line of
901	   capture), or (ii) it is possible to provide the represented area
902	   within the telepresence room, by listing the coordinates of the four
903	   co-planar points identifying the plane of interest (area of capture).
904	   The coordinates of the abovementioned points must be expressed
905	   according to the coordinate space of the capture scene the media
906	   captures belongs to.

908	   Non spatially definable captures cannot be characterized within the
909	   physical space of the telepresence room of origin.  Captures of this
910	   kind are for example those related to recordings, text captures,
911	   DVDs, registered presentations, or external streams that are played
912	   in the telepresence room and transmitted to remote sites.

914	   Spatially definable captures represent a part of the telepresence
915	   room.  The captured part of the telepresence room is described by
916	   means of the <spatialInformation> element.  By comparing the
917	   <spatialInformation> element of different media captures within the
918	   same capture scene, a consumer can better determine the spatial
919	   relationships between them and render them correctly.  Non spatially
920	   definable captures do not embed such element in their XML
921	   description: they are instead characterized by having the
922	   <nonSpatiallyDefinable> tag set to "true" (see Section 10.6).

924	   The definition of the spatial information type is the following:

926	<!-- SPATIAL INFORMATION TYPE -->
927	<xs:complexType name="spatialInformationType">
928	 <xs:sequence>
929	  <xs:element name="captureOrigin" type="captureOriginType" minOccurs="0"/>
930	  <xs:element name="captureArea" type="captureAreaType" minOccurs="0"/>
931	  <xs:any namespace="##other" processContents="lax" minOccurs="0"
932	  maxOccurs="unbounded"/>
933	 </xs:sequence>
934	 <xs:anyAttribute namespace="##other" processContents="lax"/>
935	</xs:complexType>

937	   The <captureOrigin> contains the coordinates of the capture device
938	   that is taking the capture (i.e., the capture point) , as well as,
939	   optionally, the pointing direction (i.e., the point on line of
940	   capture) (see Section 10.5.1).

942	   The <captureArea> is an optional field containing four points
943	   defining the captured area covered by the capture (see
944	   Section 10.5.2).

946	   The scale of the points coordinates is specified in the scale
947	   (Section 10.24.4) attribute of the capture scene the media capture
948	   belongs to.  Indeed, all the spatially definable media captures
949	   referring to the same capture scene share the same coordinate system
950	   and express their spatial information according to the same scale.

952	10.5.1.  <captureOrigin>

954	   The <captureOrigin> element is used to represent the position and
955	   optionally the line of capture of a capture device. <captureOrigin>
956	   MUST be included in spatially definable audio captures, while it is
957	   optional for spatially definable video captures.

959	   The XML Schema definition of the <captureOrigin> element type is the
960	   following:

962	<!-- CAPTURE ORIGIN TYPE -->
963	<xs:complexType name="captureOriginType">
964	  <xs:sequence>
965	        <xs:element name="capturePoint" type="pointType"/>
966	        <xs:element name="lineOfCapturePoint" type="pointType" minOccurs="0"/>
967	  </xs:sequence>
968	  <xs:anyAttribute namespace="##any" processContents="lax"/>
969	</xs:complexType>

971	<!-- POINT TYPE -->
972	<xs:complexType name="pointType">
973	 <xs:sequence>
974	  <xs:element name="x" type="xs:decimal"/>
975	  <xs:element name="y" type="xs:decimal"/>
976	  <xs:element name="z" type="xs:decimal"/>
977	 </xs:sequence>
978	</xs:complexType>

980	   The point type contains three spatial coordinates (x,y,z)
981	   representing a point in the space associated with a certain capture
982	   scene.

984	   The <captureOrigin> element includes a mandatory <capturePoint>
985	   element and an optional <lineOfCapturePoint> element, both of the
986	   type "pointType". <capturePoint> specifies the three coordinates
987	   identifying the position of the capture device. <lineOfCapturePoint>
988	   is another pointType element representing the "point on line of
989	   capture", that gives the pointing direction of the capture device.

991	   The coordinates of the point on line of capture MUST NOT be identical
992	   to the capture point coordinates.  For a spatially definable video
993	   capture, if the point on line of capture is provided, it MUST belong
994	   to the region between the point of capture and the capture area.  For
995	   a spatially definable audio capture, if the point on line of capture
996	   is not provided, the sensitivity pattern should be considered
997	   omnidirectional.

999	10.5.2.  <captureArea>

1001	   <captureArea> is an optional element that can be contained within the
1002	   spatial information associated with a media capture.  It represents
1003	   the spatial area captured by the media capture. <captureArea> MUST be
1004	   included in the spatial information of spatially definable video
1005	   captures, while it MUST NOT be associated with audio captures.

1007	   The XML representation of that area is provided through a set of four
1008	   point-type elements, <bottomLeft>, <bottomRight>, <topLeft>, and
1009	   <topRight> that MUST be co-planar.  The four coplanar points are
1010	   identified from the perspective of the capture device.  The XML
1011	   schema definition is the following:

1013	   <!-- CAPTURE AREA TYPE -->
1014	   <xs:complexType name="captureAreaType">
1015	    <xs:sequence>
1016	     <xs:element name="bottomLeft" type="pointType"/>
1017	     <xs:element name="bottomRight" type="pointType"/>
1018	     <xs:element name="topLeft" type="pointType"/>
1019	     <xs:element name="topRight" type="pointType"/>
1020	    </xs:sequence>
1021	   </xs:complexType>

1023	10.6.  <nonSpatiallyDefinable>

1025	   When media captures are non spatially definable, they MUST be marked
1026	   with the boolean <nonSpatiallyDefinable> element set to "true" and no
1027	   <spatialInformation> MUST be provided.  Indeed,
1028	   <nonSpatiallyDefinable> and <spatialInformation> are mutually
1029	   exclusive tags, according to the <choice> section within the XML
1030	   Schema definition of the media capture type.

1032	10.7.  <content>

1034	   A media capture can be (i) an individual media capture or (ii) a
1035	   multiple content capture (MCC).  A multiple content capture is made
1036	   by different captures that can be arranged spatially (by a
1037	   composition operation), or temporally (by a switching operation), or
1038	   that can result from the orchestration of both the techniques.  If a
1039	   media capture is an MCC, then it MAY show in its XML data model
1040	   representation the <content> element.  It is composed by a list of
1041	   media capture identifiers ("captureIDREF") and capture scene view
1042	   identifiers ("sceneViewIDREF"), where the last ones are used as
1043	   shortcuts to refer to multiple capture identifiers.  The referenced
1044	   captures are used to create the MCC according to a certain strategy.
1045	   If the <content> element does not appear in a MCC, or it has no child
1046	   elements, then the MCC is assumed to be made of multiple sources but
1047	   no information regarding those sources is provided.

1049	   <!-- CONTENT TYPE -->
1050	   <xs:complexType name="contentType">
1051	    <xs:sequence>
1052	      <xs:element name="captureIDREF" type="xs:IDREF"
1053	      minOccurs="0" maxOccurs="unbounded"/>
1054	      <xs:element name="sceneViewIDREF" type="xs:IDREF"
1055	      minOccurs="0" maxOccurs="unbounded"/>
1056	      <xs:any namespace="##other" processContents="lax" minOccurs="0"
1057	      maxOccurs="unbounded"/>
1058	    </xs:sequence>
1059	    <xs:anyAttribute namespace="##other" processContents="lax"/>
1060	   </xs:complexType>

1062	10.8.  <synchronizationID>

1064	   <synchronizationID> is an optional element for multiple content
1065	   captures that contains a numeric identifier.  Multiple content
1066	   captures marked with the same identifier in the <synchronizationID>
1067	   contain at all times captures coming from the same sources.  It is
1068	   the Media Provider that determines what the source for the captures
1069	   is.  In this way, the Media Provider can choose how to group together
1070	   single captures for the purpose of keeping them synchronized
1071	   according to the <synchronizationID> element.

1073	10.9.  <allowSubsetChoice>

1075	   <allowSubsetChoice> is an optional boolean element for multiple
1076	   content captures.  It indicates whether or not the Provider allows
1077	   the Consumer to choose a specific subset of the captures referenced
1078	   by the MCC.  If this attribute is true, and the MCC references other
1079	   captures, then the Consumer MAY specify in a CONFIGURE message a
1080	   specific subset of those captures to be included in the MCC, and the
1081	   Provider MUST then include only that subset.  If this attribute is
1082	   false, or the MCC does not reference other captures, then the
1083	   Consumer MUST NOT select a subset.  If <allowSubsetChoice> is not
1084	   shown in the XML description of the MCC, its value is to be
1085	   considered "false".

1087	10.10.  <policy>

1089	   <policy> is an optional element that can be used only for multiple
1090	   content captures.  It indicates the criteria applied to build the
1091	   multiple content capture using the media captures referenced in
1092	   <contentCaptureIDs>.  The <policy> value is in the form of a token
1093	   that indicates the policy and an index representing an instance of
1094	   the policy, separated by a ":" (e.g., SoundLevel:2, RoundRobin:0,
1095	   etc.).  The XML schema defining the type of the <policy> element is
1096	   the following:

1098	   <!-- POLICY TYPE -->
1099	   <xs:simpleType name="policyType">
1100	    <xs:restriction base="xs:string">
1101	         <xs:pattern value="([a-zA-Z0-9])+[:]([0-9])+"/>
1102	       </xs:restriction>
1103	   </xs:simpleType>

1105	   At the time of writing, only two switching policies are defined in
1106	   [I-D.ietf-clue-framework]:

1108	      SoundLevel: the content of the MCC is determined by a sound level
1109	      detection algorithm.  The loudest (active) speaker (or a previous
1110	      speaker, depending on the index value) is contained in the MCC.
1111	      Index 0 represents the most current instance of the policy, i.e.,
1112	      the currently active speaker, 1 represents the previous instance,
1113	      i.e., the previous active speaker, and so on.

1115	      RoundRobin: the content of the MCC is determined by a time based
1116	      algorithm.

1118	   Other values for the <policy> element can be used.  In this case, it
1119	   is assumed that implementations agree on the meaning of those other
1120	   values and/or those new switching policies are defined in later
1121	   documents.

1123	10.11.  <maxCaptures>

1125	   <maxCaptures> is an optional element that can be used only for
1126	   multiple content captures (MCC).  It provides information about the
1127	   number of media captures that can be represented in the multiple
1128	   content capture at a time.  If <maxCaptures> is not provided, all the
1129	   media captures listed in the <content> element can appear at a time
1130	   in the capture encoding.  The type definition is provided below.

1132	   <!-- MAX CAPTURES TYPE -->
1133	   <xs:complexType name="maxCapturesType">
1134	     <xs:simpleContent>
1135	       <xs:extension base="xs:positiveInteger">
1136	         <xs:attribute name="exactNumber" type="xs:boolean"/>
1137	       </xs:extension>
1138	     </xs:simpleContent>

1140	   </xs:complexType>

1142	   When the "exactNumber" attribute is set to "true", it means the
1143	   <maxCaptures> element carries the exact number of the media captures
1144	   appearing at a time.  Otherwise, the number of the represented media
1145	   captures MUST be considered "<=" the <maxCaptures> value.

1147	   For instance, an audio MCC having the <maxCaptures> value set to 1
1148	   means that a media stream from the MCC will only contain audio from a
1149	   single one of its constituent captures at a time.  On the other hand,
1150	   if the <maxCaptures> value is set to 4 and the exactNumber attribute
1151	   is set to "true", it would mean that the media stream received from
1152	   the MCC will always contain a mix of audio from exactly four of its
1153	   constituent captures.

1155	10.12.  <individual>

1157	   <individual> is a boolean element that MUST be used for single-
1158	   content captures.  Its value is fixed and set to "true".  Such
1159	   element indicates the capture that is being described is not a
1160	   multiple content capture.  Indeed, <individual> and the
1161	   aforementioned tags related to MCC attributes (from Section 10.7 to
1162	   Section 10.11) are mutually exclusive, according to the <choice>
1163	   section within the XML Schema definition of the media capture type.

1165	10.13.  <description>

1167	   <description> is used to provide human-readable textual information.
1168	   This element is included in the XML definition of media captures,
1169	   capture scenes and capture scene views to the aim of providing human-
1170	   readable description of, respectively, media captures, capture scenes
1171	   and capture scene views.  According to the data model definition of a
1172	   media capture (Section 10)), zero or more <description> elements can
1173	   be used, each providing information in a different language.  The
1174	   <description> element definition is the following:

1176	   <!-- DESCRIPTION element -->
1177	   <xs:element name="description">
1178	    <xs:complexType>
1179	     <xs:simpleContent>
1180	      <xs:extension base="xs:string">
1181	        <xs:attribute name="lang" type="xs:language"/>
1182	      </xs:extension>
1183	     </xs:simpleContent>
1184	    </xs:complexType>

1186	   </xs:element>

1188	   As can be seen, <description> is a string element with an attribute
1189	   ("lang") indicating the language used in the textual description.

1191	10.14.  <priority>

1193	   <priority> is an optional unsigned integer field indicating the
1194	   importance of a media capture according to the Media Provider's
1195	   perspective.  It can be used on the receiver's side to automatically
1196	   identify the most relevant contribution from the Media Provider.  The
1197	   higher the importance, the lower the contained value.  If no priority
1198	   is assigned, no assumptions regarding relative importance of the
1199	   media capture can be assumed.

1201	10.15.  <lang>

1203	   <lang> is an optional element containing the language used in the
1204	   capture.  Zero or more <lang> elements can appear in the XML
1205	   description of a media capture.

1207	10.16.  <mobility>

1209	   <mobility> is an optional element indicating whether or not the
1210	   capture device originating the capture may move during the
1211	   telepresence session.  That optional element can assume one of the
1212	   three following values:

1214	   static  SHOULD not change for the duration of the CLUE session,
1215	      across multiple ADVERTISEMENT messages.

1217	   dynamic  MAY change in each new ADVERTISEMENT message.  Can be
1218	      assumed to remain unchanged until there is a new ADVERTISEMENT
1219	      message.

1221	   highly-dinamic  MAY change dynamically, even between consecutive
1222	      ADVERTISEMENT messages.  The spatial information provided in an
1223	      ADVERTISEMENT message is simply a snapshot of the current values
1224	      at the time when the message is sent.

1226	10.17.  <relatedTo>

1228	   The optional <relatedTo> element contains the value of the captureID
1229	   attribute (Section 10.1) of the media capture to which the considered
1230	   media capture refers.  The media capture marked with a <relatedTo>
1231	   element can be for example the translation of the referred media
1232	   capture in a different language.

1234	10.18.  <view>

1236	   The <view> element is an optional tag describing what is represented
1237	   in the spatial area covered by a media capture.  The current possible
1238	   values are: "table", "lectern", "individual", and "audience", as
1239	   listed in the enumerative view type in the following.

1241	   <!-- VIEW TYPE -->
1242	   <xs:simpleType name="viewType">
1243	    <xs:restriction base="xs:string">
1244	     <xs:enumeration value="room"/>
1245	     <xs:enumeration value="table"/>
1246	     <xs:enumeration value="lectern"/>
1247	     <xs:enumeration value="individual"/>
1248	     <xs:enumeration value="audience"/>
1249	    </xs:restriction>
1250	   </xs:simpleType>

1252	10.19.  <presentation>

1254	   The <presentation> element is an optional tag used for media captures
1255	   conveying information about presentations within the telepresence
1256	   session.  The current possible values are "slides" and "images", as
1257	   listed in the enumerative presentation type in the following.

1259	   <!-- PRESENTATION TYPE -->
1260	   <xs:simpleType name="presentationType">
1261	    <xs:restriction base="xs:string">
1262	     <xs:enumeration value="slides"/>
1263	     <xs:enumeration value="image"/>
1264	    </xs:restriction>
1265	   </xs:simpleType>
1266	   </section>

1268	10.19.1.  <embeddedText>

1270	   The <embeddedText> element is a boolean element indicating that there
1271	   is text embedded in the media capture (e.g., in a video capture).
1272	   The language used in such embedded textual description is reported in
1273	   <embeddedText> "lang" attribute.

1275	   The XML Schema definition of the <embeddedText> element is:

1277	   <!-- EMBEDDED TEXT ELEMENT -->
1278	   <xs:element name="embeddedText">
1279	    <xs:complexType>
1280	     <xs:simpleContent>
1281	      <xs:extension base="xs:boolean">
1282	       <xs:attribute name="lang" type="xs:language"/>
1283	      </xs:extension>
1284	     </xs:simpleContent>
1285	    </xs:complexType>
1286	   </xs:element>

1288	10.19.2.  <capturedPeople>

1290	   This optional element is used to indicate which telepresence session
1291	   participants are represented within the media captures.  For each
1292	   participant, a <personIDREF> element is provided.

1294	10.19.2.1.  <personIDREF>

1296	   <personIDREF> contains the identifier of the represented person,
1297	   i.e., the value of the related personID attribute
1298	   (Section 10.29.1.1).  Metadata about the represented participant can
1299	   be retrieved by accessing the <people> list (Section 10.29).

1301	10.20.  Audio captures

1303	   Audio captures inherit all the features of a generic media capture
1304	   and present further audio-specific characteristics.  The XML Schema
1305	   definition of the audio capture type is reported below:

1307	   <!-- AUDIO CAPTURE TYPE -->
1308	   <xs:complexType name="audioCaptureType">
1309	    <xs:complexContent>
1310	     <xs:extension base="tns:mediaCaptureType">
1311	      <xs:sequence>
1312	       <xs:element name="sensitivyPattern" type="sensitivyPatternType"
1313	       minOccurs="0"/>
1314	       <xs:any namespace="##other" processContents="lax" minOccurs="0"
1315	       maxOccurs="unbounded"/>
1316	      </xs:sequence>
1317	      <xs:anyAttribute namespace="##other" processContents="lax"/>
1318	     </xs:extension>
1319	    </xs:complexContent>
1320	   </xs:complexType>
1321	   An example of audio-specific information that can be included is
1322	   represented by the <sensitivyPattern> element.  (Section 10.20.1).

1324	10.20.1.  <sensitivityPattern>

1326	   The <sensitivityPattern> element is an optional field describing the
1327	   characteristics of the nominal sensitivity pattern of the microphone
1328	   capturing the audio signal.

1330	   The XML Schema definition is provided below:

1332	   <xs:simpleType name="sensitivyPatternType">
1333	    <xs:restriction base="xs:string">
1334	     <xs:enumeration value="uni"/>
1335	     <xs:enumeration value="shotgun"/>
1336	     <xs:enumeration value="omni"/>
1337	     <xs:enumeration value="figure8"/>
1338	     <xs:enumeration value="cardioid"/>
1339	     <xs:enumeration value="hyper-cardioid"/>
1340	    </xs:restriction>
1341	   </xs:simpleType>

1343	10.21.  Video captures

1345	   Video captures, similarly to audio captures, extend the information
1346	   of a generic media capture with video-specific features.

1348	   The XML Schema representation of the video capture type is provided
1349	   in the following:

1351	   <!-- VIDEO CAPTURE TYPE -->
1352	   <xs:complexType name="videoCaptureType">
1353	    <xs:complexContent>
1354	     <xs:extension base="tns:mediaCaptureType">
1355	      <xs:sequence>
1356	       <xs:any namespace="##other" processContents="lax" minOccurs="0"
1357	       maxOccurs="unbounded"/>
1358	      </xs:sequence>
1359	      <xs:anyAttribute namespace="##other" processContents="lax"/>
1360	     </xs:extension>
1361	    </xs:complexContent>
1362	   </xs:complexType>

1364	10.22.  Text captures

1366	   Also text captures can be described by extending the generic media
1367	   capture information, similarly to audio captures and video captures.

1369	   The XML Schema representation of the text capture type is currently
1370	   lacking text-specific information, as it can be seen by looking at
1371	   the definition below:

1373	   <!-- TEXT CAPTURE TYPE -->
1374	   <xs:complexType name="textCaptureType">
1375	    <xs:complexContent>
1376	     <xs:extension base="tns:mediaCaptureType">
1377	     <xs:sequence>
1378	     <xs:any namespace="##other" processContents="lax" minOccurs="0"
1379	       maxOccurs="unbounded"/>
1380	     </xs:sequence>
1381	     <xs:anyAttribute namespace="##other" processContents="lax"/>
1382	     </xs:extension>
1383	    </xs:complexContent>
1384	   </xs:complexType>

1386	   Text captures SHOULD be marked as non spatially definable (i.e., they
1387	   should present in their XML description the <nonSpatiallyDefinable>
1388	   (Section 10.6) element set to "true").

1390	10.23.  Other capture types

1392	   Other media capture types can be described by using the CLUE data
1393	   model.  They can be represented by exploiting the "otherCaptureType"
1394	   type.  This media capture type is conceived to be filled in with
1395	   elements defined within extensions of the current schema, i.e., with
1396	   elements defined in other XML schemas (see Section 13 for an
1397	   example).  The otherCaptureType inherits all the features envisioned
1398	   for the abstract mediaCaptureType.

1400	   The XML Schema representation of the otherCaptureType is the
1401	   following:

1403	   <!-- OTHER CAPTURE TYPE -->
1404	   <xs:complexType name="otherCaptureType">
1405	    <xs:complexContent>
1406	     <xs:extension base="tns:mediaCaptureType">
1407	     <xs:sequence>
1408	     <xs:any namespace="##other" processContents="lax" minOccurs="0"
1409	       maxOccurs="unbounded"/>
1410	     </xs:sequence>
1411	     <xs:anyAttribute namespace="##other" processContents="lax"/>
1412	     </xs:extension>
1413	    </xs:complexContent>
1414	   </xs:complexType>

1416	   When defining new media capture types that are going to be described
1417	   by means of the <otherMediaCapture> element, spatial properties of
1418	   such new media capture types SHOULD be defined (e.g., whether or not
1419	   they are spatially definable, whether or not they should be
1420	   associated with an area of capture, etc.).

1422	10.24.  <captureScene>

1424	   A Media Provider organizes the available captures in capture scenes
1425	   in order to help the receiver both in the rendering and in the
1426	   selection of the group of captures.  Capture scenes are made of media
1427	   captures and capture scene views, that are sets of media captures of
1428	   the same media type.  Each capture scene view is an alternative to
1429	   represent completely a capture scene for a fixed media type.

1431	   The XML Schema representation of a <captureScene> element is the
1432	   following:

1434	<!-- CAPTURE SCENE TYPE -->
1435	<xs:complexType name="captureSceneType">
1436	 <xs:sequence>
1437	  <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
1438	  <xs:element name="sceneInformation" type="xcard:vcardType" minOccurs="0"/>
1439	  <xs:element name="sceneViews" type="sceneViewsType" minOccurs="0"/>
1440	  <xs:any namespace="##other" processContents="lax" minOccurs="0"
1441	  maxOccurs="unbounded"/>
1442	 </xs:sequence>
1443	 <xs:attribute name="sceneID" type="xs:ID" use="required"/>
1444	 <xs:attribute name="scale" type="scaleType" use="required"/>
1445	 <xs:anyAttribute namespace="##other" processContents="lax"/>
1446	</xs:complexType>
1447	   Each capture scene is identified by a "sceneID" attribute.  The
1448	   <captureScene> element can contain zero or more textual <description>
1449	   elements, defined as in Section 10.13.  Besides <description>, there
1450	   is the optional <sceneInformation> element (Section 10.24.1), which
1451	   contains structured information about the scene in the vcard format,
1452	   and the optional <sceneViews> element (Section 10.24.2), which is the
1453	   list of the capture scene views.  When no <sceneViews> is provided,
1454	   the capture scene is assumed to be made of all the media captures
1455	   which contain the value of its sceneID attribute in their mandatory
1456	   captureSceneIDREF attribute.

1458	10.24.1.  <sceneInformation>

1460	   The <sceneInformation> element contains optional information about
1461	   the capture scene according to the vcard format.

1463	10.24.2.  <sceneViews>

1465	   The <sceneViews> element is a mandatory field of a capture scene
1466	   containing the list of scene views.  Each scene view is represented
1467	   by a <sceneView> element (Section 10.25).

1469	   <!-- SCENE VIEWS TYPE -->
1470	   <!-- envelope of scene views of a capture scene -->
1471	   <xs:complexType name="sceneViewsType">
1472	    <xs:sequence>
1473	     <xs:element name="sceneView" type="sceneViewType"
1474	     maxOccurs="unbounded"/>
1475	    </xs:sequence>
1476	   </xs:complexType>

1478	10.24.3.  sceneID attribute

1480	   The sceneID attribute is a mandatory attribute containing the
1481	   identifier of the capture scene.

1483	10.24.4.  scale attribute

1485	   The scale attribute is a mandatory attribute that specifies the scale
1486	   of the coordinates provided in the spatial information of the media
1487	   capture belonging to the considered capture scene.  The scale
1488	   attribute can assume three different values:

1490	      "mm" - the scale is in millimeters.  Systems which know their
1491	      physical dimensions (for example professionally installed
1492	      telepresence room systems) should always provide such real-world
1493	      measurements.

1495	      "unknown" - the scale is the same for every media capture in the
1496	      capture scene but the unity of measure is undefined.  Systems
1497	      which are not aware of specific physical dimensions yet still know
1498	      relative distances should select "unknown" in the scale attribute
1499	      of the capture scene to be described.

1501	      "noscale" - there is no common physical scale among the media
1502	      captures of the capture scene.  That means the scale could be
1503	      different for each media capture.

1505	   <!-- SCALE TYPE -->
1506	   <xs:simpleType name="scaleType">
1507	    <xs:restriction base="xs:string">
1508	     <xs:enumeration value="mm"/>
1509	     <xs:enumeration value="unknown"/>
1510	     <xs:enumeration value="noscale"/>
1511	    </xs:restriction>
1512	   </xs:simpleType>

1514	10.25.  <sceneView>

1516	   A <sceneView> element represents a capture scene view, which contains
1517	   a set of media captures of the same media type describing a capture
1518	   scene.

1520	   A <sceneView> element is characterized as follows.

1522	   <!-- SCENE VIEW TYPE -->
1523	   <xs:complexType name="sceneViewType">
1524	    <xs:sequence>
1525	     <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
1526	     <xs:element name="mediaCaptureIDs" type="captureIDListType"/>
1527	    </xs:sequence>
1528	    <xs:attribute name="sceneViewID" type="xs:ID" use="required"/>
1529	   </xs:complexType>
1530	   One or more optional <description> elements provide human-readable
1531	   information about what the scene view contains. <description> is
1532	   defined as already seen in Section 10.13.

1534	   The remaining child elements are described in the following
1535	   subsections.

1537	10.25.1.  <mediaCaptureIDs>

1539	   The <mediaCaptureIDs> is the list of the identifiers of the media
1540	   captures included in the scene view.  It is an element of the
1541	   captureIDListType type, which is defined as a sequence of
1542	   <captureIDREF>, each containing the identifier of a media capture
1543	   listed within the <mediaCaptures> element:

1545	   <!-- CAPTURE ID LIST TYPE -->
1546	   <xs:complexType name="captureIDListType">
1547	    <xs:sequence>
1548	     <xs:element name="captureIDREF" type="xs:IDREF"
1549	     maxOccurs="unbounded"/>
1550	    </xs:sequence>
1551	   </xs:complexType>

1553	10.25.2.  sceneViewID attribute

1555	   The sceneViewID attribute is a mandatory attribute containing the
1556	   identifier of the capture scene view represented by the <sceneView>
1557	   element.

1559	10.26.  <encodingGroup>

1561	   The <encodingGroup> element represents an encoding group, which is
1562	   made by a set of one or more individual encodings and some parameters
1563	   that apply to the group as a whole.  Encoding groups contain
1564	   references to individual encodings that can be applied to media
1565	   captures.  The definition of the <encodingGroup> element is the
1566	   following:

1568	   <!-- ENCODING GROUP TYPE -->
1569	   <xs:complexType name="encodingGroupType">
1570	    <xs:sequence>
1571	     <xs:element name="maxGroupBandwidth" type="xs:unsignedLong"/>
1572	     <xs:element name="encodingIDList" type="encodingIDListType"/>
1573	     <xs:any namespace="##other" processContents="lax" minOccurs="0"
1574	     maxOccurs="unbounded"/>
1575	    </xs:sequence>
1576	    <xs:attribute name="encodingGroupID" type="xs:ID" use="required"/>
1577	    <xs:anyAttribute namespace="##any" processContents="lax"/>
1578	   </xs:complexType>

1580	   In the following, the contained elements are further described.

1582	10.26.1.  <maxGroupBandwidth>

1584	   <maxGroupBandwidth> is an optional field containing the maximum
1585	   bitrate expressed in bits per second that can be shared by the
1586	   individual encodings included in the encoding group.

1588	10.26.2.  <encodingIDList>

1590	   <encodingIDList> is the list of the individual encodings grouped
1591	   together in the encoding group.  Each individual encoding is
1592	   represented through its identifier contained within an <encID>
1593	   element.

1595	   <!-- ENCODING ID LIST TYPE -->
1596	   <xs:complexType name="encodingIDListType">
1597	    <xs:sequence>
1598	     <xs:element name="encID" type="xs:string" maxOccurs="unbounded"/>
1599	    </xs:sequence>
1600	   </xs:complexType>

1602	10.26.3.  encodingGroupID attribute

1604	   The encodingGroupID attribute contains the identifier of the encoding
1605	   group.

1607	10.27.  <simultaneousSet>

1609	   <simultaneousSet> represents a simultaneous transmission set, i.e., a
1610	   list of captures of the same media type that can be transmitted at
1611	   the same time by a Media Provider.  There are different simultaneous
1612	   transmission sets for each media type.

1614	   <!-- SIMULTANEOUS SET TYPE -->
1615	   <xs:complexType name="simultaneousSetType">
1616	    <xs:sequence>
1617	      <xs:element name="mediaCaptureIDREF" type="xs:IDREF"
1618	      minOccurs="0" maxOccurs="unbounded"/>
1619	      <xs:element name="sceneViewIDREF" type="xs:IDREF"
1620	      minOccurs="0" maxOccurs="unbounded"/>
1621	      <xs:element name="captureSceneIDREF" type="xs:IDREF"
1622	      minOccurs="0" maxOccurs="unbounded"/>
1623	      <xs:any namespace="##other" processContents="lax" minOccurs="0"
1624	      maxOccurs="unbounded"/>
1625	    </xs:sequence>
1626	    <xs:attribute name="setID" type="xs:ID" use="required"/>
1627	    <xs:attribute name="mediaType" type="xs:string"/>
1628	    <xs:anyAttribute namespace="##any" processContents="lax"/>
1629	   </xs:complexType>

1631	   Besides the identifiers of the captures (<mediaCaptureIDREF>
1632	   elements), also the identifiers of capture scene views and of capture
1633	   scene can be exploited as shortcuts (<sceneViewIDREF> and
1634	   <captureSceneIDREF> elements).  As an example, let's consider the
1635	   situation where there are two capture scene views (S1 and S7).  S1
1636	   contains captures AC11, AC12, AC13.  S7 contains captures AC71, AC72.
1637	   Provided that AC11, AC12, AC13, AC71, AC72 can be simultaneously sent
1638	   to the media consumer, instead of having 5 <mediaCaptureIDREF>
1639	   elements listed in the simultaneous set (i.e., one
1640	   <mediaCaptureIDREF> for AC11, one for AC12, and so on), there can be
1641	   just two <sceneViewIDREF> elements (one for S1 and one for S7).

1643	10.27.1.  setID attribute

1645	   The "setID" attribute is a mandatory field containing the identifier
1646	   of the simultaneous set.

1648	10.27.2.  mediaType attribute

1650	   The "mediaType" attribute is an optional attribute containing the
1651	   media type of the captures referenced by the simultaneous set.

1653	   When only capture scene identifiers are listed within a simultaneous
1654	   set, the media type attribute MUST appear in the XML description in
1655	   order to determine which media captures can be simultaneously sent
1656	   together.

1658	10.27.3.  <mediaCaptureIDREF>

1660	   <mediaCaptureIDREF> contains the identifier of the media capture that
1661	   belongs to the simultanous set.

1663	10.27.4.  <sceneViewIDREF>

1665	   <sceneViewIDREF> contains the identifier of the scene view containing
1666	   a group of captures that are able to be sent simultaneously with the
1667	   other captures of the simultaneous set.

1669	10.27.5.  <captureSceneIDREF>

1671	   <captureSceneIDREF> contains the identifier of the capture scene
1672	   where all the included captures of a certain media type are able to
1673	   be sent together with the other captures of the simultaneous set.

1675	10.28.  <globalView>

1677	   <globalView> is a set of captures of the same media type representing
1678	   a summary of the complete Media Provider's offer.  The content of a
1679	   global view is expressed by leveraging only scene view identifiers,
1680	   put within <sceneViewIDREF> elements.  Each global view is identified
1681	   by a unique identifier within the "globalViewID" attribute.

1683	   <!-- GLOBAL VIEW TYPE -->
1684	   <xs:complexType name="globalViewType">
1685	    <xs:sequence>
1686	      <xs:element name="sceneViewIDREF" type="xs:IDREF"
1687	       maxOccurs="unbounded"/>
1688	      <xs:any namespace="##other" processContents="lax" minOccurs="0"
1689	      maxOccurs="unbounded"/>
1690	    </xs:sequence>
1691	    <xs:attribute name="globalViewID" type="xs:ID"/>
1692	    <xs:anyAttribute namespace="##any" processContents="lax"/>
1693	   </xs:complexType>

1695	10.29.  <people>

1697	   Information about the participants that are represented in the media
1698	   captures is conveyed via the <people> element.  As it can be seen
1699	   from the XML Schema depicted below, for each participant, a <person>
1700	   element is provided.

1702	   <!-- PEOPLE TYPE -->
1703	   <xs:complexType name="peopleType">
1704	   <xs:sequence>
1705	   <xs:element name="person" type="personType"
1706	                       maxOccurs="unbounded"/>
1707	   </xs:sequence>
1708	   </xs:complexType>

1710	10.29.1.  <person>

1712	   <person> includes all the metadata related to a person represented
1713	   within one or more media captures.  Such element provides the vcard
1714	   of the subject (via the <personInfo> element, see Section 10.29.1.2)
1715	   and his conference role(s) (via one or more <personType> elements,
1716	   see Section 10.29.1.3).  Furthermore, it has a mandatory "personID"
1717	   attribute (Section 10.29.1.1).

1719	 <!-- PERSON TYPE -->
1720	 <xs:complexType name="personType">
1721	   <xs:sequence>
1722	      <xs:element name="personInfo" type="xcard:vcardType" maxOccurs="1"
1723	                          minOccurs="0"/>
1724	      <xs:element name="personType" type="personTypeType"
1725	                          minOccurs="0"
1726	                  maxOccurs="unbounded"/>
1727	      <xs:any namespace="##other" processContents="lax" minOccurs="0"
1728	                  maxOccurs="unbounded"/>
1729	   </xs:sequence>
1730	   <xs:attribute name="personID" type="xs:ID" use="required"/>
1731	   <xs:anyAttribute namespace="##other" processContents="lax"/>
1732	 </xs:complexType>

1734	10.29.1.1.  personID attribute

1736	   The "personID" attribute carries the identifier of a represented
1737	   person.  Such an identifier can be used to refer to the participant,
1738	   as in the <capturedPeople> element in the media captures
1739	   representation (Section 10.19.2).

1741	10.29.1.2.  <personInfo>

1743	   The <personInfo> element is the XML representation of all the fields
1744	   composing a vcard as specified in the Xcard RFC [RFC6351].  The
1745	   vcardType is imported by the Xcard XML Schema provided by

1747	   [I-D.ietf-ecrit-additional-data].  As such schema specifies, the <fn>
1748	   element within <vcard> is mandatory.

1750	10.29.1.3.  <personType>

1752	   The value of the <personType> element determines the role of the
1753	   represented participant within the telepresence session organization.
1754	   It can be one of the following terms, that are defined in the
1755	   framework document: "presenter", "timekeeper", "attendee", "minute
1756	   taker", "translator", "chairman", "vice-chairman".

1758	   A participant can play more than one conference role.  In that case,
1759	   more than one <personType> element will appear in his description.

1761	   <!-- PERSON TYPE TYPE -->
1762	   <xs:simpleType name="personTypeType">
1763	           <xs:restriction base="xs:string">
1764	           <xs:enumeration value="chairman"/>
1765	           <xs:enumeration value="vice-chairman"/>
1766	           <xs:enumeration value="minute taker"/>
1767	           <xs:enumeration value="presenter"/>
1768	           <xs:enumeration value="translator"/>
1769	           <xs:enumeration value="timekeeper"/>
1770	           <xs:enumeration value="attendee"/>
1771	           <xs:enumeration value="observer"/>
1772	           </xs:restriction>
1773	   </xs:simpleType>

1775	11.  <captureEncoding>

1777	   A capture encoding is given from the association of a media capture
1778	   with an individual encoding, to form a capture stream as defined in
1779	   [I-D.ietf-clue-framework].  Capture encodings are used within
1780	   CONFIGURE messages from a Media Consumer to a Media Provider for
1781	   representing the streams desired by the Media Consumer.  For each
1782	   desired stream, the Media Consumer needs to be allowed to specify:
1783	   (i) the capture identifier of the desired capture that has been
1784	   advertised by the Media Provider; (ii) the encoding identifier of the
1785	   encoding to use, among those advertised by the Media Provider; (iii)
1786	   optionally, in case of multi-content captures, the list of the
1787	   capture identifiers of the desired captures.  All the mentioned
1788	   identifiers are intended to be included in the ADVERTISEMENT message
1789	   that the CONFIGURE message refers to.  The XML model of
1790	   <captureEncoding> is provided in the following.

1792	<!-- CAPTURE ENCODING TYPE -->
1793	<xs:complexType name="captureEncodingType">
1794	 <xs:sequence>
1795	  <xs:element name="captureID" type="xs:string"/>
1796	  <xs:element name="encodingID" type="xs:string"/>
1797	  <xs:element name="configuredContent" type="contentType" minOccurs="0"/>
1798	  <xs:any namespace="##other" processContents="lax" minOccurs="0"
1799	   maxOccurs="unbounded"/>
1800	 </xs:sequence>
1801	 <xs:attribute name="ID" type="xs:ID" use="required"/>
1802	 <xs:anyAttribute namespace="##any" processContents="lax"/>
1803	</xs:complexType>

1805	11.1.  <captureID>

1807	   <captureID> is the mandatory element containing the identifier of the
1808	   media capture that has been encoded to form the capture encoding.

1810	11.2.  <encodingID>

1812	   <encodingID> is the mandatory element containing the identifier of
1813	   the applied individual encoding.

1815	11.3.  <configuredContent>

1817	   <configuredContent> is an optional element to be used in case of
1818	   configuration of MCC.  It contains the list of capture identifiers
1819	   and capture scene view identifiers the Media Consumer wants within
1820	   the MCC.  That element is structured as the <content> element used to
1821	   describe the content of an MCC.  The total number of media captures
1822	   listed in the <configuredContent> must be lower than or equal to the
1823	   value carried within the <maxCaptures> attribute of the MCC.

1825	12.  <clueInfo>

1827	   The <clueInfo> element includes all the information needed to
1828	   represent the Media Provider's description of its telepresence
1829	   capabilities according to the CLUE framework.  Indeed, it is made by:

1831	      the list of the available media captures (<mediaCaptures>
1832	      (Section 4))
1833	      the list of encoding groups (<encodingGroups> (Section 5))

1835	      the list of capture scenes (<captureScenes> (Section 6))

1837	      the list of simultaneous transmission sets (<simultaneousSets>
1838	      (Section 7))

1840	      the list of global views sets (<globalViews> (Section 8))

1842	      meta data about the participants represented in the telepresence
1843	      session (<people> (Section 10.29)).

1845	   It has been conceived only for data model testing purposes and,
1846	   though it resembles the body of an ADVERTISEMENT message, it is not
1847	   actually used in the CLUE protocol message definitions.  The
1848	   telepresence capabilities descriptions compliant to this data model
1849	   specification that can be found in Section 16 and Section 17 are
1850	   provided by using the <clueInfo> element.

1852	   <!-- CLUE INFO TYPE -->
1853	   <xs:complexType name="clueInfoType">
1854	     <xs:sequence>
1855	      <xs:element ref="mediaCaptures"/>
1856	      <xs:element ref="encodingGroups"/>
1857	      <xs:element ref="captureScenes"/>
1858	      <xs:element ref="simultaneousSets" minOccurs="0"/>
1859	      <xs:element ref="globalViews" minOccurs="0"/>
1860	      <xs:element ref="people" minOccurs="0"/>
1861	      <xs:any namespace="##other" processContents="lax" minOccurs="0"
1862	      maxOccurs="unbounded"/>
1863	     </xs:sequence>
1864	     <xs:attribute name="clueInfoID" type="xs:ID" use="required"/>
1865	     <xs:anyAttribute namespace="##other" processContents="lax"/>
1866	   </xs:complexType>

1868	13.  XML Schema extensibility

1870	   The telepresence data model defined in this document is meant to be
1871	   extensible.  Extensions are accomplished by defining elements or
1872	   attributes qualified by namespaces other than
1873	   "urn:ietf:params:xml:ns:clue-info" and
1874	   "urn:ietf:params:xml:ns:vcard-4.0" for use wherever the schema allows
1875	   such extensions (i.e., where the XML Schema definition specifies
1876	   "anyAttribute" or "anyElement").  Elements or attributes from unknown
1877	   namespaces MUST be ignored.

1879	13.1.  Example of extension

1881	   When extending the CLUE data model, a new schema with a new namespace
1882	   associated with it needs to be specified.

1884	   In the following, an example of extension is provided.  The extension
1885	   defines a new audio capture attribute ("newAudioFeature") and an
1886	   attribute for characterizing the captures belonging to an
1887	   "otherCaptureType" defined by the user.  An XML document compliant
1888	   with the extension is also included.  The XML file results validated
1889	   against the current CLUE data model schema.

1891	   <?xml version="1.0" encoding="UTF-8" ?>
1892	   <xs:schema
1893	      targetNamespace="urn:ietf:params:xml:ns:clue-info-ext"
1894	      xmlns:tns="urn:ietf:params:xml:ns:clue-info-ext"
1895	      xmlns:clue-ext="urn:ietf:params:xml:ns:clue-info-ext"
1896	      xmlns:xs="http://www.w3.org/2001/XMLSchema"
1897	      xmlns="urn:ietf:params:xml:ns:clue-info-ext"
1898	      xmlns:xcard="urn:ietf:params:xml:ns:vcard-4.0"
1899	      xmlns:info="urn:ietf:params:xml:ns:clue-info"
1900	      elementFormDefault="qualified"
1901	      attributeFormDefault="unqualified">

1903	   <!-- Import xcard XML schema -->
1904	   <xs:import namespace="urn:ietf:params:xml:ns:vcard-4.0"
1905	   schemaLocation="xcard.xsd"/>

1907	   <!-- Import CLUE XML schema -->
1908	   <xs:import namespace="urn:ietf:params:xml:ns:clue-info"
1909	   schemaLocation="clue-data-model-schema.xsd"/>

1911	   <!-- ELEMENT DEFINITIONS -->
1912	   <xs:element name="newAudioFeature" type="xs:string"/>
1913	   <xs:element name="otherMediaCaptureTypeFeature" type="xs:string"/>

1915	   </xs:schema>

1917	<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
1918	<clueInfo xmlns="urn:ietf:params:xml:ns:clue-info"
1919	xmlns:ns2="urn:ietf:params:xml:ns:vcard-4.0"
1920	xmlns:ns3="urn:ietf:params:xml:ns:clue-info-ext"
1921	clueInfoID="NapoliRoom">
1922	    <mediaCaptures>
1923	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
1924	        xsi:type="audioCaptureType"
1925	        captureID="AC0"
1926	        mediaType="audio">
1927	            <captureSceneIDREF>CS1</captureSceneIDREF>
1928	            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
1929	            <individual>true</individual>
1930	            <encGroupIDREF>EG1</encGroupIDREF>
1931	            <ns3:newAudioFeature>newAudioFeatureValue</ns3:newAudioFeature>
1932	        </mediaCapture>
1933	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
1934	        xsi:type="otherCaptureType"
1935	        captureID="OMC0"
1936	        mediaType="other media type">
1937	            <captureSceneIDREF>CS1</captureSceneIDREF>
1938	            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
1939	            <encGroupIDREF>EG1</encGroupIDREF>
1940	            <ns3:otherMediaCaptureTypeFeature>OtherValue
1941	            </ns3:otherMediaCaptureTypeFeature>
1942	        </mediaCapture>
1943	    </mediaCaptures>
1944	    <encodingGroups>
1945	        <encodingGroup encodingGroupID="EG1">
1946	            <maxGroupBandwidth>300000</maxGroupBandwidth>
1947	            <encodingIDList>
1948	                <encID>ENC4</encID>
1949	                <encID>ENC5</encID>
1950	            </encodingIDList>
1951	        </encodingGroup>
1952	    </encodingGroups>
1953	    <captureScenes>
1954	        <captureScene scale="unknown" sceneID="CS1"/>
1955	    </captureScenes>
1956	</clueInfo>

1958	14.  Security considerations

1960	   This document defines an XML Schema data model for telepresence
1961	   scenarios.  The modeled information is identified in the CLUE
1962	   framework as necessary in order to enable a full-optional media
1963	   stream negotiation and rendering.  Indeed, the XML elements herein
1964	   defined are used within CLUE protocol messages to describe both the
1965	   media streams representing the Media Provider's telepresence offer
1966	   and the desired selection requested by the Media Consumer.  Security
1967	   concerns described in [I-D.ietf-clue-framework], Section 15, apply to
1968	   this document.

1970	   Data model information carried within CLUE messages SHOULD be
1971	   accessed only by authenticated endpoints.  Indeed, some information
1972	   published by the Media Provider might reveal sensitive data about who
1973	   and what is represented in the transmitted streams.  The vCard
1974	   included in the <personInfo> elements (Section 10.29.1) mandatorily
1975	   contains the identity of the represented person.  Optionally vCards
1976	   can also carry the person's contact addresses, together with his/her
1977	   photo and other personal data.  Similar privacy-critical information
1978	   can be conveyed by means of <sceneInformation> elements
1979	   (Section 10.24.1) describing the capture scenes.  The <description>
1980	   elements (Section 10.13) also can specify details about the content
1981	   of media captures , capture scenes and scene views that should be
1982	   protected.

1984	   Integrity attacks to the data model information encapsulated in CLUE
1985	   messages can invalidate the success of the telepresence session's
1986	   setup by misleading the Media Consumer's and Media Provider's
1987	   interpretation of the offered and desired media streams.

1989	   The assurance of the authenticated access and of the integrity of the
1990	   data model information is up to the involved transport mechanisms,
1991	   namely the CLUE protocol [I-D.ietf-clue-protocol] and the CLUE data
1992	   channel [I-D.ietf-clue-datachannel].

1994	15.  IANA considerations

1996	   This document registers a new XML namespace, a new XML schema and the
1997	   MIME type for the schema.

1999	15.1.  XML namespace registration

2001	   URI: urn:ietf:params:xml:ns:clue-info

2003	   Registrant Contact: IETF CLUE Working Group <clue@ietf.org>, Roberta
2004	   Presta <roberta.presta@unina.it>

2006	   XML:

2008	BEGIN

2010	<?xml version="1.0"?>
2011	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
2012	 "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
2013	<html xmlns="http://www.w3.org/1999/xhtml">
2014	 <head>
2015	  <meta http-equiv="content-type"
2016	        content="text/html;charset=iso-8859-1"/>
2017	  <title> CLUE Data Model Namespace</title>
2018	 </head>
2019	 <body>
2020	  <h1>Namespace for CLUE Data Model</h1>
2021	  <h2>urn:ietf:params:xml:ns:clue-info</h2>
2022	  <p>See <a href="http://www.rfc-editor.org/rfc/rfcXXXX.txt"> RFC XXXX</a>.
2023	  <!--[[NOTE TO IANA/RFC-EDITOR: Please update RFC URL and replace XXXX
2024	    with the RFC number for this specification.]]-->
2025	    </p>
2026	 </body>
2027	</html>

2029	END

2031	15.2.  XML Schema registration

2033	   This section registers an XML schema per the guidelines in [RFC3688].

2035	   URI: urn:ietf:params:xml:schema:clue-info

2037	   Registrant Contact: CLUE working group (clue@ietf.org), Roberta
2038	   Presta (roberta.presta@unina.it).

2040	   Schema: The XML for this schema can be found as the entirety of
2041	   Section 3 of this document.

2043	15.3.  MIME Media Type Registration for 'application/clue_info+xml'

2045	   This section registers the "application/clue_info+xml" MIME type.

2047	   To: ietf-types@iana.org

2049	   Subject: Registration of MIME media type application/clue+xml

2051	   MIME media type name: application

2053	   MIME subtype name: clue_info+xml
2054	   Required parameters: (none)

2056	   Optional parameters: charset
2057	   Same as the charset parameter of "application/xml" as specified in
2058	   [RFC3023], Section 3.2.

2060	   Encoding considerations: Same as the encoding considerations of
2061	   "application/xml" as specified in [RFC3023], Section 3.2.

2063	   Security considerations: This content type is designed to carry data
2064	   related to telepresence information.  Some of the data could be
2065	   considered private.  This media type does not provide any protection
2066	   and thus other mechanisms such as those described in Section 14 are
2067	   required to protect the data.  This media type does not contain
2068	   executable content.

2070	   Interoperability considerations: None.

2072	   Published specification: RFC XXXX [[NOTE TO IANA/RFC-EDITOR: Please
2073	   replace XXXX with the RFC number for this specification.]]

2075	   Applications that use this media type: None.

2077	   Additional Information: Magic Number(s): (none),
2078	   File extension(s): .clue,
2079	   Macintosh File Type Code(s): TEXT.

2081	   Person & email address to contact for further information: Roberta
2082	   Presta (roberta.presta@unina.it).

2084	   Intended usage: LIMITED USE

2086	   Author/Change controller: The IETF

2088	   Other information: This media type is a specialization of
2089	   application/xml [RFC3023], and many of the considerations described
2090	   there also apply to application/clue_info+xml.

2092	16.  Sample XML file

2094	   The following XML document represents a schema compliant example of a
2095	   CLUE telepresence scenario.  Taking inspiration from the examples
2096	   described in the framework draft ([I-D.ietf-clue-framework]), it is
2097	   provided the XML representation of an endpoint-style Media Provider's
2098	   offer.

2100	   There are three cameras, where the central one is also capable of
2101	   capturing a zoomed-out view of the overall telepresence room.

2103	   Besides the three video captures coming from the cameras, the Media
2104	   Provider makes available a further multi-content capture of the
2105	   loudest segment of the room, obtained by switching the video source
2106	   across the three cameras.  For the sake of simplicity, only one audio
2107	   capture is advertised for the audio of the whole room.

2109	   The three cameras are placed in front of three participants (Alice,
2110	   Bob and Ciccio), whose vcard and conference role details are also
2111	   provided.

2113	   Media captures are arranged into four capture scene views:

2115	   1.  (VC0, VC1, VC2) - left, center and right camera video captures

2117	   2.  (VC3) - video capture associated with loudest room segment

2119	   3.  (VC4) - video capture zoomed out view of all people in the room

2121	   4.  (AC0) - main audio

2123	   There are two encoding groups: (i) EG0, for video encodings, and (ii)
2124	   EG1, for audio encodings.

2126	   As to the simultaneous sets, only VC1 and VC4 cannot be transmitted
2127	   simultaneously since they are captured by the same device, i.e., the
2128	   central camera (VC4 is a zoomed-out view while VC1 is a focused view
2129	   of the front participant).  The simultaneous sets would then be the
2130	   following:

2132	   SS1  made by VC3 and all the captures in the first capture scene view
2133	      (VC0,VC1,VC2);

2135	   SS2  made by VC3, VC0, VC2, VC4

2137	<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
2138	<clueInfo xmlns="urn:ietf:params:xml:ns:clue-info"
2139	          xmlns:ns2="urn:ietf:params:xml:ns:vcard-4.0" clueInfoID="NapoliRoom">
2140	    <mediaCaptures>
2141	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2142	         xsi:type="audioCaptureType" captureID="AC0" mediaType="audio">
2143	            <captureSceneIDREF>CS1</captureSceneIDREF>
2144	            <encGroupIDREF>EG1</encGroupIDREF>
2145	            <spatialInformation>
2146	                <captureOrigin>
2147	                        <capturePoint>
2148	                        <x>0.5</x>
2149	                        <y>1.0</y>
2150	                        <z>0.5</z>
2151	                    </capturePoint>
2152	                    <lineOfCapturePoint>
2153	                        <x>0.5</x>
2154	                        <y>0.0</y>
2155	                        <z>0.5</z>
2156	                    </lineOfCapturePoint>
2157	                </captureOrigin>
2158	            </spatialInformation>
2159	            <individual>true</individual>
2160	            <description lang="en">main audio from the room</description>
2161	            <priority>1</priority>
2162	            <lang>it</lang>
2163	            <mobility>static</mobility>
2164	            <view>room</view>
2165	            <capturedPeople>
2166	                <personIDREF>alice</personIDREF>
2167	                <personIDREF>bob</personIDREF>
2168	                <personIDREF>ciccio</personIDREF>
2169	            </capturedPeople>
2170	        </mediaCapture>
2171	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2172	         xsi:type="videoCaptureType" captureID="VC0" mediaType="video">
2173	            <captureSceneIDREF>CS1</captureSceneIDREF>
2174	            <encGroupIDREF>EG0</encGroupIDREF>
2175	            <spatialInformation>
2176	                <captureOrigin>
2177	                        <capturePoint>
2178	                        <x>0.5</x>
2179	                        <y>1.0</y>
2180	                        <z>0.5</z>
2181	                    </capturePoint>
2182	                    <lineOfCapturePoint>
2183	                        <x>0.5</x>
2184	                        <y>0.0</y>
2185	                        <z>0.5</z>
2186	                    </lineOfCapturePoint>
2187	                </captureOrigin>
2188	            </spatialInformation>
2189	            <individual>true</individual>
2190	            <description lang="en">left camera video capture</description>
2191	            <priority>1</priority>
2192	            <lang>it</lang>
2193	            <mobility>static</mobility>
2194	            <view>individual</view>
2195	            <capturedPeople>
2196	                <personIDREF>ciccio</personIDREF>
2197	            </capturedPeople>
2198	        </mediaCapture>
2199	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2200	        xsi:type="videoCaptureType" captureID="VC1" mediaType="video">
2201	            <captureSceneIDREF>CS1</captureSceneIDREF>
2202	            <encGroupIDREF>EG0</encGroupIDREF>
2203	            <spatialInformation>
2204	                <captureOrigin>
2205	                        <capturePoint>
2206	                        <x>0.5</x>
2207	                        <y>1.0</y>
2208	                        <z>0.5</z>
2209	                    </capturePoint>
2210	                    <lineOfCapturePoint>
2211	                        <x>0.5</x>
2212	                        <y>0.0</y>
2213	                        <z>0.5</z>
2214	                    </lineOfCapturePoint>
2215	                </captureOrigin>
2216	            </spatialInformation>
2217	            <individual>true</individual>
2218	            <description lang="en">central camera video capture</description>
2219	            <priority>1</priority>
2220	            <lang>it</lang>
2221	            <mobility>static</mobility>
2222	            <view>individual</view>
2223	            <capturedPeople>
2224	                <personIDREF>alice</personIDREF>
2225	            </capturedPeople>
2226	        </mediaCapture>
2227	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2228	        xsi:type="videoCaptureType" captureID="VC2" mediaType="video">
2229	            <captureSceneIDREF>CS1</captureSceneIDREF>
2230	            <encGroupIDREF>EG0</encGroupIDREF>
2231	            <spatialInformation>
2232	                <captureOrigin>
2233	                        <capturePoint>
2234	                        <x>0.5</x>
2235	                        <y>1.0</y>
2236	                        <z>0.5</z>
2237	                    </capturePoint>
2238	                    <lineOfCapturePoint>
2239	                        <x>0.5</x>
2240	                        <y>0.0</y>
2241	                        <z>0.5</z>
2242	                    </lineOfCapturePoint>
2243	                </captureOrigin>

2245	            </spatialInformation>
2246	            <individual>true</individual>
2247	            <description lang="en">right camera video capture</description>
2248	            <priority>1</priority>
2249	            <lang>it</lang>
2250	            <mobility>static</mobility>
2251	            <view>individual</view>
2252	            <capturedPeople>
2253	                <personIDREF>bob</personIDREF>
2254	            </capturedPeople>
2255	        </mediaCapture>
2256	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2257	        xsi:type="videoCaptureType" captureID="VC3" mediaType="video">
2258	            <captureSceneIDREF>CS1</captureSceneIDREF>
2259	            <encGroupIDREF>EG0</encGroupIDREF>
2260	            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
2261	            <policy>Soundlevel:0</policy>
2262	            <description lang="en">loudest room segment</description>
2263	            <priority>1</priority>
2264	            <lang>it</lang>
2265	            <mobility>static</mobility>
2266	            <view>individual</view>
2267	        </mediaCapture>
2268	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2269	        xsi:type="videoCaptureType" captureID="VC4" mediaType="video">
2270	            <captureSceneIDREF>CS1</captureSceneIDREF>
2271	            <encGroupIDREF>EG0</encGroupIDREF>
2272	            <spatialInformation>
2273	                <captureOrigin>
2274	                        <capturePoint>
2275	                        <x>0.5</x>
2276	                        <y>1.0</y>
2277	                        <z>0.5</z>
2278	                    </capturePoint>
2279	                    <lineOfCapturePoint>
2280	                        <x>0.5</x>
2281	                        <y>0.0</y>
2282	                        <z>0.5</z>
2283	                    </lineOfCapturePoint>
2284	                </captureOrigin>
2285	            </spatialInformation>
2286	            <individual>true</individual>
2287	            <description lang="en">zoomed out view of all people in the
2288	            room</description>
2289	            <priority>1</priority>
2290	            <lang>it</lang>
2291	            <mobility>static</mobility>
2292	            <view>room</view>
2293	            <capturedPeople>
2294	                <personIDREF>alice</personIDREF>
2295	                <personIDREF>bob</personIDREF>
2296	                <personIDREF>ciccio</personIDREF>
2297	            </capturedPeople>
2298	        </mediaCapture>
2299	    </mediaCaptures>
2300	    <encodingGroups>
2301	        <encodingGroup encodingGroupID="EG0">
2302	            <maxGroupBandwidth>600000</maxGroupBandwidth>
2303	            <encodingIDList>
2304	                <encID>ENC1</encID>
2305	                <encID>ENC2</encID>
2306	                <encID>ENC3</encID>
2307	            </encodingIDList>
2308	        </encodingGroup>
2309	        <encodingGroup encodingGroupID="EG1">
2310	            <maxGroupBandwidth>300000</maxGroupBandwidth>
2311	            <encodingIDList>
2312	                <encID>ENC4</encID>
2313	                <encID>ENC5</encID>
2314	            </encodingIDList>
2315	        </encodingGroup>
2316	    </encodingGroups>
2317	    <captureScenes>
2318	        <captureScene scale="unknown" sceneID="CS1">
2319	            <sceneViews>
2320	                <sceneView sceneViewID="SE1">
2321	                    <mediaCaptureIDs>
2322	                        <captureIDREF>VC0</captureIDREF>
2323	                        <captureIDREF>VC1</captureIDREF>
2324	                        <captureIDREF>VC2</captureIDREF>
2325	                    </mediaCaptureIDs>
2326	                </sceneView>
2327	                <sceneView sceneViewID="SE2">
2328	                    <mediaCaptureIDs>
2329	                        <captureIDREF>VC3</captureIDREF>
2330	                    </mediaCaptureIDs>
2331	                </sceneView>
2332	                <sceneView sceneViewID="SE3">
2333	                    <mediaCaptureIDs>
2334	                        <captureIDREF>VC4</captureIDREF>
2335	                    </mediaCaptureIDs>
2336	                </sceneView>
2337	                <sceneView sceneViewID="SE4">
2338	                    <mediaCaptureIDs>
2339	                        <captureIDREF>VC4</captureIDREF>
2340	                    </mediaCaptureIDs>

2342	                </sceneView>
2343	            </sceneViews>
2344	        </captureScene>
2345	    </captureScenes>
2346	    <simultaneousSets>
2347	        <simultaneousSet setID="SS1">
2348	            <mediaCaptureIDREF>VC3</mediaCaptureIDREF>
2349	            <sceneViewIDREF>SE1</sceneViewIDREF>
2350	        </simultaneousSet>
2351	        <simultaneousSet setID="SS2">
2352	            <mediaCaptureIDREF>VC0</mediaCaptureIDREF>
2353	            <mediaCaptureIDREF>VC2</mediaCaptureIDREF>
2354	            <mediaCaptureIDREF>VC4</mediaCaptureIDREF>
2355	            <mediaCaptureIDREF>VC3</mediaCaptureIDREF>
2356	        </simultaneousSet>
2357	    </simultaneousSets>
2358	    <people>
2359	        <person personID="bob">
2360	            <personInfo>
2361	                <ns2:fn>
2362	                    <ns2:text>Bob</ns2:text>
2363	                </ns2:fn>
2364	            </personInfo>
2365	            <personType>minute taker</personType>
2366	        </person>
2367	        <person personID="alice">
2368	            <personInfo>
2369	                <ns2:fn>
2370	                    <ns2:text>Alice</ns2:text>
2371	                </ns2:fn>
2372	            </personInfo>
2373	            <personType>presenter</personType>
2374	        </person>
2375	        <person personID="ciccio">
2376	            <personInfo>
2377	                <ns2:fn>
2378	                    <ns2:text>Ciccio</ns2:text>
2379	                </ns2:fn>
2380	            </personInfo>
2381	            <personType>chairman</personType>
2382	            <personType>timekeeper</personType>
2383	        </person>
2384	    </people>
2385	</clueInfo>
2386	17.  MCC example

2388	   Enhancing the scenario presented in the previous example, the Media
2389	   Provider is able to advertise a composed capture VC7 made by a big
2390	   picture representing the current speaker (VC3) and two picture-in-
2391	   picture boxes representing the previous speakers (the previous one
2392	   -VC5- and the oldest one -VC6).  The provider does not want to
2393	   instantiate and send VC5 and VC6, so it does not associate any
2394	   encoding group with them.  Their XML representations are provided for
2395	   enabling the description of VC7.

2397	   A possible description for that scenario could be the following:

2399	<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
2400	<clueInfo xmlns="urn:ietf:params:xml:ns:clue-info"
2401	xmlns:ns2="urn:ietf:params:xml:ns:vcard-4.0" clueInfoID="NapoliRoom">
2402	    <mediaCaptures>
2403	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2404	        xsi:type="audioCaptureType" captureID="AC0" mediaType="audio">
2405	            <captureSceneIDREF>CS1</captureSceneIDREF>
2406	            <encGroupIDREF>EG1</encGroupIDREF>
2407	            <spatialInformation>
2408	                <captureOrigin>
2409	                        <capturePoint>
2410	                        <x>0.5</x>
2411	                        <y>1.0</y>
2412	                        <z>0.5</z>
2413	                    </capturePoint>
2414	                    <lineOfCapturePoint>
2415	                        <x>0.5</x>
2416	                        <y>0.0</y>
2417	                        <z>0.5</z>
2418	                    </lineOfCapturePoint>
2419	                </captureOrigin>
2420	            </spatialInformation>
2421	            <individual>true</individual>
2422	            <description lang="en">main audio from the room</description>
2423	            <priority>1</priority>
2424	            <lang>it</lang>
2425	            <mobility>static</mobility>
2426	            <view>room</view>
2427	            <capturedPeople>
2428	                <personIDREF>alice</personIDREF>
2429	                <personIDREF>bob</personIDREF>
2430	                <personIDREF>ciccio</personIDREF>
2431	            </capturedPeople>

2433	        </mediaCapture>
2434	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2435	        xsi:type="videoCaptureType" captureID="VC0" mediaType="video">
2436	            <captureSceneIDREF>CS1</captureSceneIDREF>
2437	            <encGroupIDREF>EG0</encGroupIDREF>
2438	            <spatialInformation>
2439	                <captureOrigin>
2440	                        <capturePoint>
2441	                        <x>0.5</x>
2442	                        <y>1.0</y>
2443	                        <z>0.5</z>
2444	                    </capturePoint>
2445	                    <lineOfCapturePoint>
2446	                        <x>0.5</x>
2447	                        <y>0.0</y>
2448	                        <z>0.5</z>
2449	                    </lineOfCapturePoint>
2450	                </captureOrigin>
2451	            </spatialInformation>
2452	            <individual>true</individual>
2453	            <description lang="en">left camera video capture</description>
2454	            <priority>1</priority>
2455	            <lang>it</lang>
2456	            <mobility>static</mobility>
2457	            <view>individual</view>
2458	            <capturedPeople>
2459	                <personIDREF>ciccio</personIDREF>
2460	            </capturedPeople>
2461	        </mediaCapture>
2462	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2463	        xsi:type="videoCaptureType" captureID="VC1" mediaType="video">
2464	            <captureSceneIDREF>CS1</captureSceneIDREF>
2465	            <encGroupIDREF>EG0</encGroupIDREF>
2466	            <spatialInformation>
2467	                <captureOrigin>
2468	                        <capturePoint>
2469	                        <x>0.5</x>
2470	                        <y>1.0</y>
2471	                        <z>0.5</z>
2472	                    </capturePoint>
2473	                    <lineOfCapturePoint>
2474	                        <x>0.5</x>
2475	                        <y>0.0</y>
2476	                        <z>0.5</z>
2477	                    </lineOfCapturePoint>
2478	                </captureOrigin>
2479	            </spatialInformation>
2480	            <individual>true</individual>
2481	            <description lang="en">central camera video capture</description>
2482	            <priority>1</priority>
2483	            <lang>it</lang>
2484	            <mobility>static</mobility>
2485	            <view>individual</view>
2486	            <capturedPeople>
2487	                <personIDREF>alice</personIDREF>
2488	            </capturedPeople>
2489	        </mediaCapture>
2490	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2491	        xsi:type="videoCaptureType" captureID="VC2" mediaType="video">
2492	            <captureSceneIDREF>CS1</captureSceneIDREF>
2493	            <encGroupIDREF>EG0</encGroupIDREF>
2494	            <spatialInformation>
2495	                <captureOrigin>
2496	                        <capturePoint>
2497	                        <x>0.5</x>
2498	                        <y>1.0</y>
2499	                        <z>0.5</z>
2500	                    </capturePoint>
2501	                    <lineOfCapturePoint>
2502	                        <x>0.5</x>
2503	                        <y>0.0</y>
2504	                        <z>0.5</z>
2505	                    </lineOfCapturePoint>
2506	                </captureOrigin>
2507	            </spatialInformation>
2508	            <individual>true</individual>
2509	            <description lang="en">right camera video capture</description>
2510	            <priority>1</priority>
2511	            <lang>it</lang>
2512	            <mobility>static</mobility>
2513	            <view>individual</view>
2514	            <capturedPeople>
2515	                <personIDREF>bob</personIDREF>
2516	            </capturedPeople>
2517	        </mediaCapture>
2518	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2519	        xsi:type="videoCaptureType" captureID="VC3" mediaType="video">
2520	            <captureSceneIDREF>CS1</captureSceneIDREF>
2521	            <encGroupIDREF>EG0</encGroupIDREF>
2522	            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
2523	            <content>
2524	                <sceneViewIDREF>SE1</sceneViewIDREF>
2525	            </content>
2526	            <policy>Soundlevel:0</policy>
2527	            <description lang="en">loudest room segment</description>
2528	            <priority>1</priority>
2529	            <lang>it</lang>
2530	            <mobility>static</mobility>
2531	            <view>individual</view>
2532	        </mediaCapture>
2533	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2534	        xsi:type="videoCaptureType" captureID="VC4" mediaType="video">
2535	            <captureSceneIDREF>CS1</captureSceneIDREF>
2536	            <encGroupIDREF>EG0</encGroupIDREF>
2537	            <spatialInformation>
2538	                <captureOrigin>
2539	                        <capturePoint>
2540	                        <x>0.5</x>
2541	                        <y>1.0</y>
2542	                        <z>0.5</z>
2543	                    </capturePoint>
2544	                    <lineOfCapturePoint>
2545	                        <x>0.5</x>
2546	                        <y>0.0</y>
2547	                        <z>0.5</z>
2548	                    </lineOfCapturePoint>
2549	                </captureOrigin>
2550	            </spatialInformation>
2551	            <individual>true</individual>
2552	            <description lang="en">zoomed out view of all people in the room</description>
2553	            <priority>1</priority>
2554	            <lang>it</lang>
2555	            <mobility>static</mobility>
2556	            <view>room</view>
2557	            <capturedPeople>
2558	                <personIDREF>alice</personIDREF>
2559	                <personIDREF>bob</personIDREF>
2560	                <personIDREF>ciccio</personIDREF>
2561	            </capturedPeople>
2562	        </mediaCapture>
2563	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2564	        xsi:type="videoCaptureType" captureID="VC5" mediaType="video">
2565	            <captureSceneIDREF>CS1</captureSceneIDREF>
2566	            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
2567	            <content>
2568	                <sceneViewIDREF>SE1</sceneViewIDREF>
2569	            </content>
2570	            <policy>Soundlevel:1</policy>
2571	            <description lang="en">penultimate loudest room segment</description>
2572	            <priority>1</priority>
2573	            <lang>it</lang>
2574	            <mobility>static</mobility>
2575	            <view>individual</view>
2576	        </mediaCapture>
2577	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2578	        xsi:type="videoCaptureType" captureID="VC6" mediaType="video">
2579	            <captureSceneIDREF>CS1</captureSceneIDREF>
2580	            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
2581	            <content>
2582	                <sceneViewIDREF>SE1</sceneViewIDREF>
2583	            </content>
2584	            <policy>Soundlevel:2</policy>
2585	            <description lang="en">last but two loudest room segment</description>
2586	            <priority>1</priority>
2587	            <lang>it</lang>
2588	            <mobility>static</mobility>
2589	            <view>individual</view>
2590	        </mediaCapture>
2591	        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2592	        xsi:type="videoCaptureType" captureID="VC7" mediaType="video">
2593	            <captureSceneIDREF>CS1</captureSceneIDREF>
2594	            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
2595	            <content>
2596	                <captureIDREF>VC3</captureIDREF>
2597	                <captureIDREF>VC5</captureIDREF>
2598	                <captureIDREF>VC6</captureIDREF>
2599	            </content>
2600	            <description lang="en">big picture of the current speaker +
2601	            pips about previous speakers</description>
2602	            <priority>1</priority>
2603	            <lang>it</lang>
2604	            <mobility>static</mobility>
2605	            <view>individual</view>
2606	        </mediaCapture>
2607	    </mediaCaptures>
2608	    <encodingGroups>
2609	        <encodingGroup encodingGroupID="EG0">
2610	            <maxGroupBandwidth>600000</maxGroupBandwidth>
2611	            <encodingIDList>
2612	                <encID>ENC1</encID>
2613	                <encID>ENC2</encID>
2614	                <encID>ENC3</encID>
2615	            </encodingIDList>
2616	        </encodingGroup>
2617	        <encodingGroup encodingGroupID="EG1">
2618	            <maxGroupBandwidth>300000</maxGroupBandwidth>
2619	            <encodingIDList>
2620	                <encID>ENC4</encID>
2621	                <encID>ENC5</encID>
2622	            </encodingIDList>
2623	        </encodingGroup>
2624	    </encodingGroups>
2625	    <captureScenes>
2626	        <captureScene scale="unknown" sceneID="CS1">
2627	            <sceneViews>
2628	                <sceneView sceneViewID="SE1">
2629	                    <description lang="en">participants' individual
2630	                    videos</description>
2631	                    <mediaCaptureIDs>
2632	                        <captureIDREF>VC0</captureIDREF>
2633	                        <captureIDREF>VC1</captureIDREF>
2634	                        <captureIDREF>VC2</captureIDREF>
2635	                    </mediaCaptureIDs>
2636	                </sceneView>
2637	                <sceneView sceneViewID="SE2">
2638	                    <description lang="en">loudest segment of the
2639	                    room</description>
2640	                    <mediaCaptureIDs>
2641	                        <captureIDREF>VC3</captureIDREF>
2642	                    </mediaCaptureIDs>
2643	                </sceneView>
2644	                <sceneView sceneViewID="SE5">
2645	                    <description lang="en">loudest segment of the
2646	                    room + pips</description>
2647	                    <mediaCaptureIDs>
2648	                        <captureIDREF>VC7</captureIDREF>
2649	                    </mediaCaptureIDs>
2650	                </sceneView>
2651	                <sceneView sceneViewID="SE4">
2652	                    <description lang="en">room audio</description>
2653	                    <mediaCaptureIDs>
2654	                        <captureIDREF>AC0</captureIDREF>
2655	                    </mediaCaptureIDs>
2656	                </sceneView>
2657	                <sceneView sceneViewID="SE3">
2658	                    <description lang="en">room video</description>
2659	                    <mediaCaptureIDs>
2660	                        <captureIDREF>VC4</captureIDREF>
2661	                    </mediaCaptureIDs>
2662	                </sceneView>
2663	            </sceneViews>
2664	        </captureScene>
2665	    </captureScenes>
2666	    <simultaneousSets>
2667	        <simultaneousSet setID="SS1">
2668	            <mediaCaptureIDREF>VC7</mediaCaptureIDREF>
2669	            <sceneViewIDREF>SE1</sceneViewIDREF>
2670	        </simultaneousSet>
2671	        <simultaneousSet setID="SS2">
2672	            <mediaCaptureIDREF>VC0</mediaCaptureIDREF>
2673	            <mediaCaptureIDREF>VC2</mediaCaptureIDREF>
2674	            <mediaCaptureIDREF>VC4</mediaCaptureIDREF>
2675	            <mediaCaptureIDREF>VC7</mediaCaptureIDREF>
2676	        </simultaneousSet>
2677	    </simultaneousSets>
2678	    <people>
2679	        <person personID="bob">
2680	            <personInfo>
2681	                <ns2:fn>
2682	                    <ns2:text>Bob</ns2:text>
2683	                </ns2:fn>
2684	            </personInfo>
2685	            <personType>minute taker</personType>
2686	        </person>
2687	        <person personID="alice">
2688	            <personInfo>
2689	                <ns2:fn>
2690	                    <ns2:text>Alice</ns2:text>
2691	                </ns2:fn>
2692	            </personInfo>
2693	            <personType>presenter</personType>
2694	        </person>
2695	        <person personID="ciccio">
2696	            <personInfo>
2697	                <ns2:fn>
2698	                    <ns2:text>Ciccio</ns2:text>
2699	                </ns2:fn>
2700	            </personInfo>
2701	            <personType>chairman</personType>
2702	            <personType>timekeeper</personType>
2703	        </person>
2704	    </people>
2705	</clueInfo>

2707	18.  Diff with draft-ietf-clue-data-model-schema-09 version

2709	   o  We have introduced a <captureOrigin> element containing a
2710	      mandatory <capturePoint> and an optional <lineOfCapturePoint> in
2711	      the definition of <spatialInformation> as per Paul's review

2713	   o  A new type definition for switching policies (resembled by
2714	      <policy> element) has been provided in order to have acceptable
2715	      values in the form of "token:index".

2717	   o  Minor modifications suggested in WGLC reviews have been applied.

2719	19.  Diff with draft-ietf-clue-data-model-schema-08 version

2721	   o  Typos correction

2723	20.  Diff with draft-ietf-clue-data-model-schema-07 version

2725	   o  IANA Considerations: text added

2727	   o  maxCaptureEncodings removed

2729	   o  personTypeType values aligned with CLUE framework

2731	   o  allowSubsetChoice added for multiple content captures

2733	   o  embeddedText moved from videoCaptureType definition to
2734	      mediaCaptureType definition

2736	   o  typos removed from section Terminology

2738	21.  Diff with draft-ietf-clue-data-model-schema-06 version

2740	   o  Capture Scene Entry/Entries renamed as Capture Scene View/Views in
2741	      the text, <sceneEntry>/<sceneEntries> renamed as <sceneView>/
2742	      <sceneViews> in the XML schema.

2744	   o  Global Scene Entry/Entries renamed as Global View/Views in the
2745	      text, <globalSceneEntry>/<globalSceneEntries> renamed as
2746	      <globalView>/<globalViews>

2748	   o  Security section added.

2750	   o  Extensibility: a new type is introduced to describe other types of
2751	      media capture (otherCaptureType), text and example added.

2753	   o  Spatial information section updated: capture point optional, text
2754	      now is coherent with the framework one.

2756	   o  Audio capture description: <sensitivityPattern> added,
2757	      <audioChannelFormat> removed, <captureArea> disallowed.

2759	   o  Simultaneous set definition: added <captureSceneIDREF> to refer to
2760	      capture scene identifiers as shortcuts and an optional mediaType
2761	      attribute which is mandatory to use when only capture scene
2762	      identifiers are listed.

2764	   o  Encoding groups: removed the constraint of the same media type.

2766	   o  Updated text about media captures without <encodingGroupIDREF>
2767	      (optional in the XML schema).

2769	   o  "mediaType" attribute removed from homogeneous groups of capture
2770	      (scene views and globlal views)

2772	   o  "mediaType" attribute removed from the global view textual
2773	      description.

2775	   o  "millimeters" scale value changed in "mm"

2777	22.  Diff with draft-ietf-clue-data-model-schema-04 version

2779	      globalCaptureEntries/Entry renamed as globalSceneEntries/Entry;

2781	      sceneInformation added;

2783	      Only capture scene entry identifiers listed within global scene
2784	      entries (media capture identifiers removed);

2786	      <participants> renamed as <people> in the >clueInfo< template

2788	      <vcard> renamed as <personInfo> to synch with the framework
2789	      terminology

2791	      <participantType> renamed as <personType> to synch with the
2792	      framework terminology

2794	      <participantIDs> renamed as <capturedPeople> in the media capture
2795	      type definition to remove ambiguity

2797	      Examples have been updated with the new definitions of
2798	      <globalSceneEntries> and of <people>.

2800	23.  Diff with draft-ietf-clue-data-model-schema-03 version

2802	      encodings section has been removed

2804	      global capture entries have been introduced

2806	      capture scene entry identifiers are used as shortcuts in listing
2807	      the content of MCC (similarly to simultaneous set and global
2808	      capture entries)

2810	      Examples have been updated.  A new example with global capture
2811	      entries has been added.

2813	      <encGroupIDREF> has been made optional.

2815	      <single> has been renamed into <individual>

2817	      Obsolete comments have been removed.

2819	      participants information has been added.

2821	24.  Diff with  draft-ietf-clue-data-model-schema-02 version

2823	      captureParameters and encodingParameters have been removed from
2824	      the captureEncodingType

2826	      data model example has been updated and validated according to the
2827	      new schema.  Further description of the represented scenario has
2828	      been provided.

2830	      A multiple content capture example has been added.

2832	      Obsolete comments and references have been removed.

2834	25.  Acknowledgments

2836	   The authors thank all the CLUErs for their precious feedbacks and
2837	   support.

2839	26.  Informative References

2841	   [I-D.ietf-clue-datachannel]       Holmberg, C., "CLUE Protocol data
2842	                                     channel",
2843	                                     draft-ietf-clue-datachannel-09
2844	                                     (work in progress), March 2015.

2846	   [I-D.ietf-clue-framework]         Duckworth, M., Pepperell, A., and
2847	                                     S. Wenger, "Framework for
2848	                                     Telepresence Multi-Streams",
2849	                                     draft-ietf-clue-framework-22 (work
2850	                                     in progress), April 2015.

2852	   [I-D.ietf-clue-protocol]          Presta, R. and S. Romano, "CLUE
2853	                                     protocol",
2854	                                     draft-ietf-clue-protocol-04 (work
2855	                                     in progress), April 2015.

2857	   [I-D.ietf-ecrit-additional-data]  Gellens, R., Rosen, B., Tschofenig,
2858	                                     H., Marshall, R., and J.
2859	                                     Winterbottom, "Additional Data
2860	                                     Related to an Emergency Call",
2861	                                     (work in progress), March 2015.

2863	   [RFC3023]                         Murata, M., St. Laurent, S., and D.
2864	                                     Kohn, "XML Media Types", RFC 3023,
2865	                                     January 2001.

2867	   [RFC3550]                         Schulzrinne, H., Casner, S.,
2868	                                     Frederick, R., and V. Jacobson,
2869	                                     "RTP: A Transport Protocol for
2870	                                     Real-Time Applications", STD 64,
2871	                                     RFC 3550, July 2003.

2873	   [RFC3688]                         Mealling, M., "The IETF XML
2874	                                     Registry", BCP 81, RFC 3688,
2875	                                     January 2004.

2877	   [RFC4353]                         Rosenberg, J., "A Framework for
2878	                                     Conferencing with the Session
2879	                                     Initiation Protocol (SIP)",
2880	                                     RFC 4353, February 2006.

2882	   [RFC4796]                         Hautakorpi, J. and G. Camarillo,
2883	                                     "The Session Description Protocol
2884	                                     (SDP) Content Attribute", RFC 4796,
2885	                                     February 2007.

2887	   [RFC5117]                         Westerlund, M. and S. Wenger, "RTP
2888	                                     Topologies", RFC 5117,
2889	                                     January 2008.

2891	   [RFC6351]                         Perreault, S., "xCard: vCard XML
2892	                                     Representation", RFC 6351,
2893	                                     August 2011.

2895	Authors' Addresses

2897	   Roberta Presta
2898	   University of Napoli
2899	   Via Claudio 21
2900	   Napoli  80125
2901	   Italy

2903	   EMail: roberta.presta@unina.it
2904	   Simon Pietro Romano
2905	   University of Napoli
2906	   Via Claudio 21
2907	   Napoli  80125
2908	   Italy

2910	   EMail: spromano@unina.it