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Versions: 00 01 03 draft-ietf-clue-data-model-schema

CLUE Working Group                                             R. Presta
Internet-Draft                                               S P. Romano
Intended status: Informational                      University of Napoli
Expires: September 9, 2013                                 March 8, 2013


                 An XML Schema for the CLUE data model
                 draft-presta-clue-data-model-schema-03

Abstract

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

Status of This Memo

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

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

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

   This Internet-Draft will expire on September 9, 2013.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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

Table of Contents




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   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  XML Schema . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  <mediaCaptures>  . . . . . . . . . . . . . . . . . . . . . . . 13
   5.  <encodings>  . . . . . . . . . . . . . . . . . . . . . . . . . 13
   6.  <encodingGroups> . . . . . . . . . . . . . . . . . . . . . . . 13
   7.  <captureScenes>  . . . . . . . . . . . . . . . . . . . . . . . 14
   8.  <simultaneousSets> . . . . . . . . . . . . . . . . . . . . . . 14
   9.  <captureEncodings> . . . . . . . . . . . . . . . . . . . . . . 14
   10. <mediaCapture> . . . . . . . . . . . . . . . . . . . . . . . . 14
     10.1.  <capturedMedia> . . . . . . . . . . . . . . . . . . . . . 15
     10.2.  <captureSceneIDREF> . . . . . . . . . . . . . . . . . . . 15
     10.3.  <encGroupIDREF> . . . . . . . . . . . . . . . . . . . . . 16
     10.4.  <spatialInformation>  . . . . . . . . . . . . . . . . . . 16
       10.4.1.  <capturePoint>  . . . . . . . . . . . . . . . . . . . 17
       10.4.2.  <captureArea> . . . . . . . . . . . . . . . . . . . . 18
     10.5.  <nonSpatiallyDefinible> . . . . . . . . . . . . . . . . . 18
     10.6.  <description> . . . . . . . . . . . . . . . . . . . . . . 19
     10.7.  <priority>  . . . . . . . . . . . . . . . . . . . . . . . 19
     10.8.  <lang>  . . . . . . . . . . . . . . . . . . . . . . . . . 19
     10.9.  <content> . . . . . . . . . . . . . . . . . . . . . . . . 19
     10.10. <switched>  . . . . . . . . . . . . . . . . . . . . . . . 20
     10.11. <dynamic> . . . . . . . . . . . . . . . . . . . . . . . . 20
     10.12. <composed>  . . . . . . . . . . . . . . . . . . . . . . . 20
     10.13. <maxCaptureEncodings> . . . . . . . . . . . . . . . . . . 20
     10.14. <relatedTo> . . . . . . . . . . . . . . . . . . . . . . . 20
     10.15. captureID attribute . . . . . . . . . . . . . . . . . . . 21
   11. Audio captures . . . . . . . . . . . . . . . . . . . . . . . . 21
     11.1.  <audioChannelFormat>  . . . . . . . . . . . . . . . . . . 21
     11.2.  <micPattern>  . . . . . . . . . . . . . . . . . . . . . . 22
   12. Video captures . . . . . . . . . . . . . . . . . . . . . . . . 22
     12.1.  <nativeAspectRatio> . . . . . . . . . . . . . . . . . . . 23
     12.2.  <embeddedText>  . . . . . . . . . . . . . . . . . . . . . 23
   13. Text captures  . . . . . . . . . . . . . . . . . . . . . . . . 24
   14. <captureScene> . . . . . . . . . . . . . . . . . . . . . . . . 24
     14.1.  <sceneSpace> (was:<sceneArea>)  . . . . . . . . . . . . . 25
     14.2.  <sceneEntries>  . . . . . . . . . . . . . . . . . . . . . 26
     14.3.  sceneID attribute . . . . . . . . . . . . . . . . . . . . 26
     14.4.  scale attribute . . . . . . . . . . . . . . . . . . . . . 26
   15. <sceneEntry> . . . . . . . . . . . . . . . . . . . . . . . . . 27
     15.1.  <switchingPolicies> . . . . . . . . . . . . . . . . . . . 27
     15.2.  <mediaCaptureIDs> . . . . . . . . . . . . . . . . . . . . 28
     15.3.  sceneEntryID attribute  . . . . . . . . . . . . . . . . . 29
     15.4.  mediaType attribute . . . . . . . . . . . . . . . . . . . 29
   16. <encoding> . . . . . . . . . . . . . . . . . . . . . . . . . . 29
     16.1.  <encodingName>  . . . . . . . . . . . . . . . . . . . . . 29
     16.2.  <maxBandwidth>  . . . . . . . . . . . . . . . . . . . . . 29
     16.3.  encodingID attribute  . . . . . . . . . . . . . . . . . . 30



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   17. Audio encodings  . . . . . . . . . . . . . . . . . . . . . . . 30
   18. Video encodings  . . . . . . . . . . . . . . . . . . . . . . . 30
     18.1.  <maxWidth>  . . . . . . . . . . . . . . . . . . . . . . . 31
     18.2.  <maxHeight> . . . . . . . . . . . . . . . . . . . . . . . 31
     18.3.  <maxFrameRate>  . . . . . . . . . . . . . . . . . . . . . 31
   19. H26X encodings . . . . . . . . . . . . . . . . . . . . . . . . 31
   20. <encodingGroup>  . . . . . . . . . . . . . . . . . . . . . . . 32
     20.1.  <maxGroupBandwidth> . . . . . . . . . . . . . . . . . . . 32
     20.2.  <maxGroupPps> . . . . . . . . . . . . . . . . . . . . . . 33
     20.3.  <encodingIDList>  . . . . . . . . . . . . . . . . . . . . 33
     20.4.  encodingGroupID attribute . . . . . . . . . . . . . . . . 33
   21. <simultaneousSet>  . . . . . . . . . . . . . . . . . . . . . . 33
     21.1.  <captureIDREF>  . . . . . . . . . . . . . . . . . . . . . 34
     21.2.  <sceneEntryIDREF> . . . . . . . . . . . . . . . . . . . . 34
   22. <captureEncoding>  . . . . . . . . . . . . . . . . . . . . . . 34
     22.1.  <mediaCaptureID>  . . . . . . . . . . . . . . . . . . . . 34
     22.2.  <encodingID>  . . . . . . . . . . . . . . . . . . . . . . 34
   23. <clueInfo> . . . . . . . . . . . . . . . . . . . . . . . . . . 34
   24. Sample XML file  . . . . . . . . . . . . . . . . . . . . . . . 35
   25. Diff with unofficial -02 version . . . . . . . . . . . . . . . 44
   26. Diff with -02 version  . . . . . . . . . . . . . . . . . . . . 46
   27. Informative References . . . . . . . . . . . . . . . . . . . . 46





























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1.  Introduction

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

   The schema is based on information contained in
   [I-D.ietf-clue-framework] and also relates to the data model sketched
   in [I-D.romanow-clue-data-model].  It encodes information and
   constraints defined in the aforementioned documents in order to
   provide a formal representation of the concepts therein presented.
   The schema definition is intended to be modified according to changes
   applied to the above mentioned CLUE documents.

   The document actually represents a strawman proposal aiming at the
   definition of a coherent structure for all the information associated
   with the description of a telepresence scenario.

2.  Terminology

   [TBD] Copy text from the framework document.

3.  XML Schema

   This section contains the proposed CLUE data model schema definition.

   The element and attribute definitions are formal representation of
   the concepts needed to describe the capabilities of a media provider
   and the current streams it is transmitting within a telepresence
   session.

   The main groups of information are:

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

      <encodings>: the list of individual encodings (Section 5)

      <encodingGroups>: the list of encodings groups (Section 6)

      <captureScenes>: the list of capture scenes (Section 7)

      <simultaneousSets>: the list of simultaneous capture
      sets(Section 8)

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

   All of the above refers to concepts that have been introduced in
   [I-D.ietf-clue-framework] and [I-D.romanow-clue-data-model] and



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   further detailed in threads on the mailing list as well as in the
   following of this document.


<?xml version="1.0" encoding="UTF-8" ?>
<xs:schema
   targetNamespace="urn:ietf:params:xml:ns:clue-info"
   xmlns:tns="urn:ietf:params:xml:ns:clue-info"
   xmlns:xs="http://www.w3.org/2001/XMLSchema"
   xmlns="urn:ietf:params:xml:ns:clue-info"
   elementFormDefault="qualified"
   attributeFormDefault="unqualified">

<!-- ELEMENT DEFINITIONS -->
<xs:element name="mediaCaptures" type="mediaCapturesType"/>
<xs:element name="encodings" type="encodingsType"/>
<xs:element name="encodingGroups" type="encodingGroupsType"/>
<xs:element name="captureScenes" type="captureScenesType"/>
<xs:element name="simultaneousSets" type="simultaneousSetsType"/>
<xs:element name="captureEncodings" type="captureEncodingsType"/>

<!-- MEDIA CAPTURES TYPE -->
<!-- envelope of media captures -->
<xs:complexType name="mediaCapturesType">
 <xs:sequence>
   <xs:element name="mediaCapture" type="mediaCaptureType"
   maxOccurs="unbounded"/>
 </xs:sequence>
</xs:complexType>

<!-- DESCRIPTION element -->
<xs:element name="description">
 <xs:complexType>
  <xs:simpleContent>
   <xs:extension base="xs:string">
     <xs:attribute name="lang" type="xs:language"/>
   </xs:extension>
  </xs:simpleContent>
 </xs:complexType>
</xs:element>

<!-- MEDIA CAPTURE TYPE -->
<xs:complexType name="mediaCaptureType" abstract="true">
  <xs:sequence>
    <!-- mandatory fields -->
    <xs:element name="capturedMedia" type="xs:string"/>
    <xs:element name="captureSceneIDREF" type="xs:IDREF"/>
    <xs:element name="encGroupIDREF" type="xs:IDREF"/>



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    <xs:choice>
      <xs:sequence>
        <xs:element name="spatialInformation" type="tns:spatialInformationType"
        maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:element name="nonSpatiallyDefinible" type="xs:boolean" fixed="true"/>
    </xs:choice>
    <!-- optional fields -->
    <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
    <xs:element name="priority" type="xs:integer" minOccurs="0"/>
    <xs:element name="lang" type="xs:language" minOccurs="0"/>
    <xs:element name="content" type="xs:string" minOccurs="0"/>
    <xs:element name="switched" type="xs:boolean" minOccurs="0"/>
    <xs:element name="dynamic" type="xs:boolean" minOccurs="0"/>
    <xs:element name="composed" type="xs:boolean" minOccurs="0"/>
    <xs:element name="maxCaptureEncodings" type="xs:unsignedInt"
    minOccurs="0"/>
    <!-- this is in place of "supplementary info": -->
    <xs:element name="relatedTo" type="xs:IDREF" minOccurs="0"/>
    <xs:any namespace="##other" processContents="lax" minOccurs="0"
    maxOccurs="unbounded"/>
  </xs:sequence>
  <xs:attribute name="captureID" type="xs:ID" use="required"/>
  <xs:anyAttribute namespace="##other" processContents="lax"/>
</xs:complexType>

<!-- SPATIAL INFORMATION TYPE -->
<xs:complexType name="spatialInformationType">
 <xs:sequence>
  <xs:element name="capturePoint" type="capturePointType"/>
  <xs:element name="captureArea" type="captureAreaType"
  minOccurs="0"/>
  <xs:any namespace="##other" processContents="lax" minOccurs="0"
  maxOccurs="unbounded"/>
 </xs:sequence>
 <xs:anyAttribute namespace="##other" processContents="lax"/>
</xs:complexType>

<!-- TEXT CAPTURE TYPE -->
<xs:complexType name="textCaptureType">
 <xs:complexContent>
  <xs:extension base="tns:mediaCaptureType">
  </xs:extension>
 </xs:complexContent>
</xs:complexType>


<!-- AUDIO CAPTURE TYPE -->



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<xs:complexType name="audioCaptureType">
 <xs:complexContent>
  <xs:extension base="tns:mediaCaptureType">
   <xs:sequence>
    <xs:element name="audioChannelFormat" type="audioChannelFormatType"
    minOccurs="0"/>
    <xs:element name="micPattern" type="tns:micPatternType"
    minOccurs="0"/>
   </xs:sequence>
  </xs:extension>
 </xs:complexContent>
</xs:complexType>

<!-- MIC PATTERN TYPE -->
<xs:simpleType name="micPatternType">
 <xs:restriction base="xs:string">
  <xs:enumeration value="uni"/>
  <xs:enumeration value="shotgun"/>
  <xs:enumeration value="omni"/>
  <xs:enumeration value="figure8"/>
  <xs:enumeration value="cardioid"/>
  <xs:enumeration value="hyper-cardioid"/>
 </xs:restriction>
</xs:simpleType>

<!-- AUDIO CHANNEL FORMAT TYPE -->
<xs:simpleType name="audioChannelFormatType">
 <xs:restriction base="xs:string">
  <xs:enumeration value="mono"/>
  <xs:enumeration value="stereo"/>
 </xs:restriction>
</xs:simpleType>

<!-- VIDEO CAPTURE TYPE -->
<xs:complexType name="videoCaptureType">
 <xs:complexContent>
  <xs:extension base="tns:mediaCaptureType">
   <xs:sequence>
    <xs:element name="nativeAspectRatio" type="xs:string"
    minOccurs="0"/>
    <xs:element ref="embeddedText" minOccurs="0"/>
   </xs:sequence>
  </xs:extension>
 </xs:complexContent>
</xs:complexType>

<!-- EMBEDDED TEXT ELEMENT -->
<xs:element name="embeddedText">



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 <xs:complexType>
  <xs:simpleContent>
   <xs:extension base="xs:boolean">
    <xs:attribute name="lang" type="xs:language"/>
   </xs:extension>
  </xs:simpleContent>
 </xs:complexType>
</xs:element>

<!-- CAPTURE SCENES TYPE -->
<!-- envelope of capture scenes -->
<xs:complexType name="captureScenesType">
 <xs:sequence>
  <xs:element name="captureScene" type="captureSceneType"
  maxOccurs="unbounded"/>
 </xs:sequence>
</xs:complexType>

<!-- CAPTURE SCENE TYPE -->
<xs:complexType name="captureSceneType">
 <xs:sequence>
  <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
  <xs:element name="sceneSpace" type="captureSpaceType" minOccurs="0"/>
  <xs:element name="sceneEntries" type="sceneEntriesType"/>
  <xs:any namespace="##other" processContents="lax" minOccurs="0"
  maxOccurs="unbounded"/>
 </xs:sequence>
 <xs:attribute name="sceneID" type="xs:ID" use="required"/>
 <xs:attribute name="scale" type="scaleType" use="required"/>
 <xs:anyAttribute namespace="##other" processContents="lax"/>
</xs:complexType>

<!-- SCALE TYPE -->
<xs:simpleType name="scaleType">
 <xs:restriction base="xs:string">
  <xs:enumeration value="millimeters"/>
  <xs:enumeration value="unknown"/>
  <xs:enumeration value="noscale"/>
 </xs:restriction>
</xs:simpleType>

<!-- CAPTURE AREA TYPE -->
<xs:complexType name="captureAreaType">
 <xs:sequence>
  <xs:element name="bottomLeft" type="pointType"/>
  <xs:element name="bottomRight" type="pointType"/>
  <xs:element name="topLeft" type="pointType"/>
  <xs:element name="topRight" type="pointType"/>



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 </xs:sequence>
</xs:complexType>

<!-- CAPTURE SPACE TYPE -->
<xs:complexType name="captureSpaceType">
 <xs:sequence>
  <xs:element name="bottomLeftFront" type="pointType"/>
  <xs:element name="bottomRightFront" type="pointType"/>
  <xs:element name="topLeftFront" type="pointType"/>
  <xs:element name="topRightFront" type="pointType"/>
  <xs:element name="bottomLeftBack" type="pointType"/>
  <xs:element name="bottomRightBack" type="pointType"/>
  <xs:element name="topLeftBack" type="pointType"/>
  <xs:element name="topRightBack" type="pointType"/>
 </xs:sequence>
</xs:complexType>

<!-- POINT TYPE -->
<xs:complexType name="pointType">
 <xs:sequence>
  <xs:element name="x" type="xs:decimal"/>
  <xs:element name="y" type="xs:decimal"/>
  <xs:element name="z" type="xs:decimal"/>
 </xs:sequence>
</xs:complexType>

<!-- CAPTURE POINT TYPE -->
<xs:complexType name="capturePointType">
 <xs:complexContent>
  <xs:extension base="pointType">
   <xs:sequence>
    <xs:element name="lineOfCapturePoint" type="tns:pointType"
    minOccurs="0"/>
   </xs:sequence>
   <xs:attribute name="pointID" type="xs:ID"/>
  </xs:extension>
 </xs:complexContent>
</xs:complexType>


<!-- SCENE ENTRIES TYPE -->
<!-- envelope of scene entries of a capture scene -->
<xs:complexType name="sceneEntriesType">
 <xs:sequence>
  <xs:element name="sceneEntry" type="sceneEntryType"
  maxOccurs="unbounded"/>
 </xs:sequence>
</xs:complexType>



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<!-- SCENE ENTRY TYPE -->
<xs:complexType name="sceneEntryType">
 <xs:sequence>
  <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
  <xs:element name="switchingPolicies" type="switchingPoliciesType"
  minOccurs="0"/>
  <xs:element name="mediaCaptureIDs" type="captureIDListType"/>
 </xs:sequence>
 <xs:attribute name="sceneEntryID" type="xs:ID" use="required"/>
 <xs:attribute name="mediaType" type="xs:string" use="required"/>
</xs:complexType>

<!-- SWITCHING POLICIES TYPE -->
<xs:complexType name="switchingPoliciesType">
 <xs:sequence>
  <xs:element name="siteSwitching" type="xs:boolean" minOccurs="0"/>
  <xs:element name="segmentSwitching" type="xs:boolean"
  minOccurs="0"/>
 </xs:sequence>
</xs:complexType>

<!-- CAPTURE ID LIST TYPE -->
<xs:complexType name="captureIDListType">
 <xs:sequence>
  <xs:element name="captureIDREF" type="xs:IDREF"
  maxOccurs="unbounded"/>
 </xs:sequence>
</xs:complexType>

<!-- ENCODINGS TYPE -->
<xs:complexType name="encodingsType">
 <xs:sequence>
  <xs:element name="encoding" type="encodingType"
  maxOccurs="unbounded"/>
 </xs:sequence>
</xs:complexType>

<!-- ENCODING TYPE -->
<xs:complexType name="encodingType" abstract="true">
 <xs:sequence>
  <xs:element name="encodingName" type="xs:string"/>
  <xs:element name="maxBandwidth" type="xs:integer"/>
  <xs:any namespace="##other" processContents="lax" minOccurs="0"
  maxOccurs="unbounded"/>
 </xs:sequence>
 <xs:attribute name="encodingID" type="xs:ID" use="required"/>
 <xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>



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<!-- AUDIO ENCODING TYPE -->
<xs:complexType name="audioEncodingType">
 <xs:complexContent>
  <xs:extension base="tns:encodingType">
   <xs:sequence>
    <xs:element name="encodedMedia" type="xs:string" fixed="audio"
    minOccurs="0"/>
   </xs:sequence>
  </xs:extension>
 </xs:complexContent>
</xs:complexType>

<!-- VIDEO ENCODING TYPE -->
<xs:complexType name="videoEncodingType">
 <xs:complexContent>
  <xs:extension base="tns:encodingType">
   <xs:sequence>
    <xs:element name="encodedMedia" type="xs:string" fixed="video"
    minOccurs="0"/>
    <xs:element name="maxWidth" type="xs:integer" minOccurs="0"/>
    <xs:element name="maxHeight" type="xs:integer" minOccurs="0"/>
    <xs:element name="maxFrameRate" type="xs:integer" minOccurs="0"/>
   </xs:sequence>
  </xs:extension>
 </xs:complexContent>
</xs:complexType>

<!-- H26X ENCODING TYPE -->
<xs:complexType name="h26XEncodingType">
 <xs:complexContent>
  <xs:extension base="tns:videoEncodingType">
   <xs:sequence>
    <!-- max number of pixels to be processed per second -->
    <xs:element name="maxH26Xpps" type="xs:integer"
    minOccurs="0"/>
   </xs:sequence>
  </xs:extension>
 </xs:complexContent>
</xs:complexType>

<!-- ENCODING GROUPS TYPE -->
<xs:complexType name="encodingGroupsType">
 <xs:sequence>
  <xs:element name="encodingGroup" type="tns:encodingGroupType"
  maxOccurs="unbounded"/>
 </xs:sequence>
</xs:complexType>




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<!-- ENCODING GROUP TYPE -->
<xs:complexType name="encodingGroupType">
 <xs:sequence>
  <xs:element name="maxGroupBandwidth" type="xs:integer"/>
  <xs:element name="maxGroupPps" type="xs:integer"
  minOccurs="0"/>
  <xs:element name="encodingIDList" type="encodingIDListType"/>
  <xs:any namespace="##other" processContents="lax" minOccurs="0"
  maxOccurs="unbounded"/>
 </xs:sequence>
 <xs:attribute name="encodingGroupID" type="xs:ID" use="required"/>
 <xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>

<!-- ENCODING ID LIST TYPE -->
<xs:complexType name="encodingIDListType">
 <xs:sequence>
  <xs:element name="encIDREF" type="xs:IDREF" maxOccurs="unbounded"/>
 </xs:sequence>
</xs:complexType>

<!-- SIMULTANEOUS SETS TYPE -->
<xs:complexType name="simultaneousSetsType">
 <xs:sequence>
  <xs:element name="simultaneousSet" type="simultaneousSetType"
  maxOccurs="unbounded"/>
 </xs:sequence>
</xs:complexType>

<!-- SIMULTANEOUS SET TYPE -->
<xs:complexType name="simultaneousSetType">
 <xs:sequence>
   <xs:element name="captureIDREF" type="xs:IDREF"
   minOccurs="0" maxOccurs="unbounded"/>
   <xs:element name="sceneEntryIDREF" type="xs:IDREF"
   minOccurs="0" maxOccurs="unbounded"/>
 </xs:sequence>
</xs:complexType>

<!-- CAPTURE ENCODING TYPE -->
<xs:complexType name="captureEncodingType">
 <xs:sequence>
  <xs:element name="mediaCaptureID" type="xs:string"/>
  <xs:element name="encodingID" type="xs:string"/>
 </xs:sequence>
</xs:complexType>

<!-- CAPTURE ENCODINGS TYPE -->



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<xs:complexType name="captureEncodingsType">
 <xs:sequence>
  <xs:element name="captureEncoding" type="captureEncodingType"
  maxOccurs="unbounded"/>
 </xs:sequence>
</xs:complexType>

<!-- CLUE INFO ELEMENT -->
<!-- the <clueInfo> envelope can be seen
     as the ancestor of an <advertisement> envelope -->
<xs:element name="clueInfo" type="clueInfoType"/>

<!-- CLUE INFO TYPE -->
<xs:complexType name="clueInfoType">
  <xs:sequence>
   <xs:element ref="mediaCaptures"/>
   <xs:element ref="encodings"/>
   <xs:element ref="encodingGroups"/>
   <xs:element ref="captureScenes"/>
   <xs:element ref="simultaneousSets"/>
   <xs:any namespace="##other" processContents="lax" minOccurs="0"
   maxOccurs="unbounded"/>
  </xs:sequence>
  <xs:attribute name="clueInfoID" type="xs:ID" use="required"/>
  <xs:anyAttribute namespace="##other" processContents="lax"/>
</xs:complexType>

</xs:schema>


   Following sections describe the XML schema in more detail.

4.  <mediaCaptures>

   <mediaCaptures> represents the list of one ore more media captures
   available on the media provider's side.  Each media capture is
   represented by a <mediaCapture> element (Section 10).

5.  <encodings>

   <encodings> represents the list of individual encodings available on
   the media provider's side.  Each individual encoding is represented
   by an <encoding> element (Section 16).

6.  <encodingGroups>

   <encodingGroups> represents the list of the encoding groups organized
   on the media provider's side.  Each encoding group is represented by



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   a <encodingGroup> element (Section 20).

7.  <captureScenes>

   <captureScenes> represents the list of the capture scenes organized
   on the media provider's side.  Each capture scene is represented by a
   <captureScene> element.  (Section 14).

8.  <simultaneousSets>

   <simultaneousSets> contains the simultaneous sets indicated by the
   media provider.  Each simultaneous set is represented by a
   <simultaneousSet> element.  (Section 21).

9.  <captureEncodings>

   <captureEncodings> is a list of capture encodings.  It can represents
   the list of the desired capture encodings indicated by the media
   consumer or the list of instantiated captures on the provider's side.
   Each capture encoding is represented by a <captureEncoding> element.
   (Section 22).

10.  <mediaCapture>

   According to the CLUE framework, a media capture is the fundamental
   representation of a media flow that is available on the provider's
   side.  Media captures are characterized with a set of features that
   are independent from the specific type of medium, and with a set of
   feature that are media-specific.  We design the media capture type as
   an abstract type, providing all the features that can be common to
   all media types.  Media-specific captures, such as video captures,
   audio captures and others, are specialization of that media capture
   type, as in a typical generalization-specialization hierarchy.

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
















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<!-- MEDIA CAPTURE TYPE -->
<xs:complexType name="mediaCaptureType" abstract="true">
  <xs:sequence>
    <!-- mandatory fields -->
    <xs:element name="capturedMedia" type="xs:string"/>
    <xs:element name="captureSceneIDREF" type="xs:IDREF"/>
    <xs:element name="encGroupIDREF" type="xs:IDREF"/>
    <xs:choice>
      <xs:sequence>
        <xs:element name="spatialInformation" type="tns:spatialInformationType"
        maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:element name="nonSpatiallyDefinible" type="xs:boolean" fixed="true"/>
    </xs:choice>
    <!-- optional fields -->
    <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
    <xs:element name="priority" type="xs:integer" minOccurs="0"/>
    <xs:element name="lang" type="xs:language" minOccurs="0"/>
    <xs:element name="content" type="xs:string" minOccurs="0"/>
    <xs:element name="switched" type="xs:boolean" minOccurs="0"/>
    <xs:element name="dynamic" type="xs:boolean" minOccurs="0"/>
    <xs:element name="composed" type="xs:boolean" minOccurs="0"/>
    <xs:element name="maxCaptureEncodings" type="xs:unsignedInt"
    minOccurs="0"/>
    <!-- this is in place of "supplementary info": -->
    <xs:element name="relatedTo" type="xs:IDREF" minOccurs="0"/>
    <xs:any namespace="##other" processContents="lax" minOccurs="0"
    maxOccurs="unbounded"/>
  </xs:sequence>
  <xs:attribute name="captureID" type="xs:ID" use="required"/>
  <xs:anyAttribute namespace="##other" processContents="lax"/>
</xs:complexType>


10.1.  <capturedMedia>

   <capturedMedia> is a mandatory field specifying the media type of the
   capture ("audio", "video", "text",...).

10.2.  <captureSceneIDREF>

   <captureSceneIDREF> is a mandatory field containing the identifier of
   the capture scene the media capture belongs to.  Indeed, each media
   capture must be associated with one and only capture scene.  When a
   media capture is spatially definible, some spatial information is
   provided along with it in the form of point coordinates (see
   Section 10.4).  Such coordinates refers to the space of coordinates
   defined for the capture scene containing the capture.



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10.3.  <encGroupIDREF>

   <encGroupIDREF> is a mandatory field containing the identifier of the
   encoding group the media capture is associated with.

10.4.  <spatialInformation>

   Media captures are divided into two categories: non spatially
   definible captures and spatially definible captures.

   Non spatially definible captures are those that do not capture parts
   of the telepresence room.  Capture of this case are for example those
   related to registrations, text captures, DVDs, registered
   presentation, or external streams, that are played in the
   telepresence room and transmitted to remote sites.

   Spatially definible captures are those that capture part of the
   telepresence room.  The captured part of the telepresence room is
   described by means of the <spatialInformation> element.

   This is the definition of the spatial information type:



   <!-- SPATIAL INFORMATION TYPE -->
   <xs:complexType name="spatialInformationType">
    <xs:sequence>
     <xs:element name="capturePoint" type="capturePointType"/>
     <xs:element name="captureArea" type="captureAreaType"
     minOccurs="0"/>
     <xs:any namespace="##other" processContents="lax"
     minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
    <xs:anyAttribute namespace="##other"
    processContents="lax"/>
   </xs:complexType>


   The <capturePoint> contains the coordinates of the capture device
   that is taking the capture, as well as, optionally, the pointing
   direction (see Section 10.4.1).  It is a mandatory field when the
   media capture is spatially definible, independently from the media
   type.

   The <captureArea> is an optional field containing four points
   defining the captured area represented by the capture (see
   Section 10.4.2).




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10.4.1.  <capturePoint>

   The <capturePoint> element is used to represent the position and the
   line of capture of a capture device.  The XML Schema definition of
   the <capturePoint> element type is the following:



   <!-- CAPTURE POINT TYPE -->
   <xs:complexType name="capturePointType">
    <xs:complexContent>
     <xs:extension base="pointType">
      <xs:sequence>
       <xs:element name="lineOfCapturePoint"
       type="tns:pointType"
       minOccurs="0"/>
      </xs:sequence>
      <xs:attribute name="pointID" type="xs:ID"/>
     </xs:extension>
    </xs:complexContent>
   </xs:complexType>

   <!-- POINT TYPE -->
   <xs:complexType name="pointType">
    <xs:sequence>
     <xs:element name="x" type="xs:decimal"/>
     <xs:element name="y" type="xs:decimal"/>
     <xs:element name="z" type="xs:decimal"/>
    </xs:sequence>
   </xs:complexType>


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

   The capture point type extends the point type, i.e., it is
   represented by three coordinates identifying the position of the
   capture device, but can add further information.  Such further
   information is conveyed by the <lineOfCapturePoint>, which is another
   point-type element representing the "point on line of capture", that
   gives the pointing direction of the capture device.

   If the point of capture is not specified, it means the consumer
   should not assume anything about the spatial location of the
   capturing device.

   The coordinates of the point on line of capture MUST NOT be identical



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   to the capture point coordinates.  If the point on line of capture is
   not specified, no assumptions are made about the axis of the
   capturing device.

10.4.2.  <captureArea>

   <captureArea> is an optional element that can be contained within the
   spatial information associated with a media capture.  It represents
   the spatial area captured by the media capture.

   The XML representation of that area is provided through a set of four
   point-type element, <bottomLeft>, <bottomRight>, <topLeft>, and
   <topRight>, as it can be seen from the following definition:



   <!-- CAPTURE AREA TYPE -->
   <xs:complexType name="captureAreaType">
    <xs:sequence>
     <xs:element name="bottomLeft" type="pointType"/>
     <xs:element name="bottomRight" type="pointType"/>
     <xs:element name="topLeft" type="pointType"/>
     <xs:element name="topRight" type="pointType"/>
    </xs:sequence>
   </xs:complexType>


   <bottomLeft>, <bottomRight>, <topLeft>, and <topRight> should be co-
   planar.

   For a switched capture that switches between different sections
   within a larger area, the area of capture should use coordinates for
   the larger potential area.

   By comparing the capture area of different media captures within the
   same capture scene, a consumer can determine the spatial
   relationships between them and render them correctly.  If the area of
   capture is not specified, it means the Media Capture is not spatially
   related to any other media capture.

10.5.  <nonSpatiallyDefinible>

   When media captures are non spatially definible, they are marked with
   the boolean <nonSpatiallyDefinible> element set to "true".







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10.6.  <description>

   <description> is used to provide optionally human-readable textual
   information.  It is used to describe media captures, capture scenes
   and capture scene entries.  A media capture can be described by using
   multiple <description> elements, each one providing information in a
   different language.  Indeed, the <description> element definition is
   the following:



   <!-- DESCRIPTION element -->
   <xs:element name="description">
    <xs:complexType>
     <xs:simpleContent>
      <xs:extension base="xs:string">
        <xs:attribute name="lang" type="xs:language"/>
      </xs:extension>
     </xs:simpleContent>
    </xs:complexType>
   </xs:element>


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

10.7.  <priority>

   <priority> ([I-D.groves-clue-capture-attr]) is an optional integer
   field indicating the importance of a media capture according to the
   media provider's perspective.  It can be used on the receiver's side
   to automatically identify the most "important" contribution available
   from the media provider.

   [edt note: no final consensus has been reached on the adoption of
   such media capture attribute.]

10.8.  <lang>

   <lang> is an optional element containing the language used in the
   capture, if any.  The purpose of the element could match the one of
   the "language" attribute proposed in [I-D.groves-clue-capture-attr].

10.9.  <content>

   <content> is an optional string element.  It contains enumerated
   values describing the "role" of the media capture according to what



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   is envisionend in [RFC4796] ("slides", "speaker", "sl", "main",
   "alt").  The values for this attribute are the same as the mediacnt
   values for the content attribute in [RFC4796].  This attribute can
   list multiple values, for example "main, speaker".

   [edt note: a better XML Schema definition for that element will soon
   be defined.]

10.10.  <switched>

   <switched> is a boolean element which indicates whether or not the
   media capture represents the most appropriate subset of a "whole".
   What is "most appropriate" is up to the provider and could be the
   active speaker, a lecturer or a VIP.

   [edt note: :(]

10.11.  <dynamic>

   <dynamic> is an optional boolean element indicating wheter or not the
   capture device originating the capture moves during the telepresence
   session.  That optional boolean element has the same purpose of the
   dynamic attribute proposed in [I-D.groves-clue-capture-attr].

   [edt note: There isn't yet final consensus about that element.]

10.12.  <composed>

   <composed> is an optional boolean element indicating wheter or not
   the media capture is a mix (audio) or composition (video) of streams.
   This attribute is useful for a media consumer for example to avoid
   nesting a composed video capture into another composed capture or
   rendering.

10.13.  <maxCaptureEncodings>

   The optional <maxCaptureEncodings> contains an unsigned integer
   indicating the maximum number of capture encodings that can be
   simultaneously active for the media capture.  If absent, this
   parameter defaults to 1.  The minimum value for this attribute is 1.
   The number of simultaneous capture encodings is also limited by the
   restrictions of the encoding group the media capture refers to my
   means of the <encGroupIDREF> element.

10.14.  <relatedTo>

   The optional <relatedTo> element contains the value of the ID
   attribute of the media capture it refers to.  The media capture



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   marked with a <relatedTo> element can be for example the translation
   of a main media capture in a different language.  The <relatedTo>
   element could be interpreted the same manner of the supplementary
   information attribute proposed in [I-D.groves-clue-capture-attr] and
   further discussed in
   http://www.ietf.org/mail-archive/web/clue/current/msg02238.html.

   [edt note: There isn't yet final consensus about that element.]

10.15.  captureID attribute

   The "captureID" attribute is a mandatory field containing the
   identifier of the media capture.

11.  Audio captures

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



 <!-- AUDIO CAPTURE TYPE -->
 <xs:complexType name="audioCaptureType">
  <xs:complexContent>
   <xs:extension base="tns:mediaCaptureType">
    <xs:sequence>
     <xs:element name="audioChannelFormat" type="audioChannelFormatType"
     minOccurs="0"/>
     <xs:element name="micPattern" type="tns:micPatternType"
     minOccurs="0"/>
    </xs:sequence>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>


   Audio-specific information about the audio capture is contained in
   <audioChannelFormat> (Section 11.1) and in <micPattern>
   (Section 11.2).

11.1.  <audioChannelFormat>

   The optional <audioChannelFormat> element is a field with enumerated
   values ("mono" and "stereo") which describes the method of encoding
   used for audio.  A value of "mono" means the audio capture has one
   channel.  A value of "stereo" means the audio capture has two audio
   channels, left and right.  A single stereo capture is different from



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   two mono captures that have a left-right spatial relationship.  A
   stereo capture maps to a single RTP stream, while each mono audio
   capture maps to a separate RTP stream.

   The XML Schema definition of the <audioChannelFormat> element type is
   provided below:



   <!-- AUDIO CHANNEL FORMAT TYPE -->
   <xs:simpleType name="audioChannelFormatType">
    <xs:restriction base="xs:string">
     <xs:enumeration value="mono"/>
     <xs:enumeration value="stereo"/>
    </xs:restriction>
   </xs:simpleType>


11.2.  <micPattern>

   The <micPattern> element is an optional field describing the
   characteristic of the mic capturing the audio signal.  It can
   contains the enumerated values listed below:



   <!-- MIC PATTERN TYPE -->
   <xs:simpleType name="micPatternType">
    <xs:restriction base="xs:string">
     <xs:enumeration value="uni"/>
     <xs:enumeration value="shotgun"/>
     <xs:enumeration value="omni"/>
     <xs:enumeration value="figure8"/>
     <xs:enumeration value="cardioid"/>
     <xs:enumeration value="hyper-cardioid"/>
    </xs:restriction>
   </xs:simpleType>


12.  Video captures

   Video captures, similarly to audio captures, extend the information
   of a generic media capture with video-specific features, such as
   <nativeAspectRatio> (Section 12.1) and <embeddedText> (Section 12.2).

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




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   <!-- VIDEO CAPTURE TYPE -->
   <xs:complexType name="videoCaptureType">
    <xs:complexContent>
     <xs:extension base="tns:mediaCaptureType">
      <xs:sequence>
       <xs:element name="nativeAspectRatio" type="xs:string"
       minOccurs="0"/>
       <xs:element ref="embeddedText" minOccurs="0"/>
      </xs:sequence>
     </xs:extension>
    </xs:complexContent>
   </xs:complexType>


12.1.  <nativeAspectRatio>

   If a video capture has a native aspect ratio (for instance, it
   corresponds to a camera that generates 4:3 video), then it can be
   supplied as a value of the <nativeAspectRatio> element, in order to
   help rendering.

12.2.  <embeddedText>

   The <embeddedText> element is a boolean element indicating that there
   is text embedded in the video capture.  The language used in such
   embedded textual description is reported in <embeddedText> "lang"
   attribute.

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



   <!-- EMBEDDED TEXT ELEMENT -->
   <xs:element name="embeddedText">
    <xs:complexType>
     <xs:simpleContent>
      <xs:extension base="xs:boolean">
       <xs:attribute name="lang" type="xs:language"/>
      </xs:extension>
     </xs:simpleContent>
    </xs:complexType>

   </xs:element>


   The <embeddedText> element could correspond to the embedded-text
   attribute introduced in [I-D.groves-clue-capture-attr]




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   [edt note: no final consensus has been reached yet about the adoption
   of such element]

13.  Text captures

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

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



   <!-- TEXT CAPTURE TYPE -->
   <xs:complexType name="textCaptureType">
    <xs:complexContent>
     <xs:extension base="tns:mediaCaptureType">
     </xs:extension>
    </xs:complexContent>
   </xs:complexType>


14.  <captureScene>

   A media provider organizes the available capture in capture scenes in
   order to help the receiver both in the rendering and in the selection
   of the group of captures.  Capture scenes are made of capture scene
   entries, that are set of media captures of the same media type.  Each
   capture scene entry represents an alternative to represent completely
   a capture scene for a fixed media type.

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



 <!-- CAPTURE SCENE TYPE -->
 <xs:complexType name="captureSceneType">
  <xs:sequence>
   <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
   <xs:element name="sceneSpace" type="captureSpaceType" minOccurs="0"/>
   <xs:element name="sceneEntries" type="sceneEntriesType"/>
   <xs:any namespace="##other" processContents="lax" minOccurs="0"
   maxOccurs="unbounded"/>
  </xs:sequence>
  <xs:attribute name="sceneID" type="xs:ID" use="required"/>
  <xs:attribute name="scale" type="scaleType" use="required"/>



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  <xs:anyAttribute namespace="##other" processContents="lax"/>
 </xs:complexType>


   The <captureScene> element can contain zero or more textual
   <description> elements, defined as in Section 10.6.  Besides
   <description>, there are two other fields: <sceneSpace>
   (Section 14.1), describing the coordinate space which the media
   captures of the capture scene refer to, and <sceneEntries>
   (Section 14.2), the list of the capture scene entries.

14.1.  <sceneSpace> (was:<sceneArea>)

   The <sceneSpace> describes a bounding volume for the spatial
   information provided alongside spatially-definible media capture
   associated with the considered capture scene.  Such volume is
   described as an arbitrary hexahedrons with eight points
   (<bottomLeftFront>, <bottomRightFront>, <topLeftFront>,
   <topRightFront>, <bottomLeftBack>, <bottomRightBack>, <topLeftBack>,
   and <topRightBack>).  The coordinate system is Cartesian X, Y, Z with
   the origin at a spatial location of the media provider's choosing.
   The media provider must use the same coordinate system with same
   scale and origin for all media capture coordinates within the same
   capture scene.



   <!-- CAPTURE SPACE TYPE -->
   <xs:complexType name="captureSpaceType">
    <xs:sequence>
     <xs:element name="bottomLeftFront" type="pointType"/>
     <xs:element name="bottomRightFront" type="pointType"/>
     <xs:element name="topLeftFront" type="pointType"/>
     <xs:element name="topRightFront" type="pointType"/>
     <xs:element name="bottomLeftBack" type="pointType"/>
     <xs:element name="bottomRightBack" type="pointType"/>
     <xs:element name="topLeftBack" type="pointType"/>
     <xs:element name="topRightBack" type="pointType"/>
    </xs:sequence>
   </xs:complexType>


   [edt note: this is just a place holder, the definition of the
   bounding volume has to be discussed]







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14.2.  <sceneEntries>

   The <sceneEntries> element is a mandatory field of a capture scene
   containing the list of scene entries.  Each scene entry is
   represented by a <sceneEntry> element (Section 15).



   <!-- SCENE ENTRIES TYPE -->
   <!-- envelope of scene entries of a capture scene -->
   <xs:complexType name="sceneEntriesType">
    <xs:sequence>
     <xs:element name="sceneEntry" type="sceneEntryType"
     maxOccurs="unbounded"/>
    </xs:sequence>
   </xs:complexType>


14.3.  sceneID attribute

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

14.4.  scale attribute

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

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

      "unknown" - the scale is not necessarily millimeters, but the
      scale is the same for every media capture in the capture scene.
      Systems which don't know specific physical dimensions but still
      know relative distances should select "unknown" in the scale
      attribute of the capture scene to be described.

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







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   <!-- SCALE TYPE -->
   <xs:simpleType name="scaleType">
    <xs:restriction base="xs:string">
     <xs:enumeration value="millimeters"/>
     <xs:enumeration value="unknown"/>
     <xs:enumeration value="noscale"/>
    </xs:restriction>
   </xs:simpleType>


15.  <sceneEntry>

   A <sceneEntry> element represents a capture scene entry, which
   contains a set of media capture of the same media type describing a
   capture scene.

   A <sceneEntry> element is characterized as follows.



   <!-- SCENE ENTRY TYPE -->
   <xs:complexType name="sceneEntryType">
    <xs:sequence>
     <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
     <xs:element name="switchingPolicies" type="switchingPoliciesType"
     minOccurs="0"/>
     <xs:element name="mediaCaptureIDs" type="captureIDListType"/>
    </xs:sequence>
    <xs:attribute name="sceneEntryID" type="xs:ID" use="required"/>
    <xs:attribute name="mediaType" type="xs:string" use="required"/>
   </xs:complexType>


   One or more optional <description> elements provide human-readable
   information about what the scene entry contains. <description> is
   defined as already seen in Section 10.6.

   The remaining child elements are described in the following
   subsections.

15.1.  <switchingPolicies>

   <switchingPolicies> represents the switching policies the media
   provider support for the media captures contained inside a scene
   entry.  The <switchingPolicies> element contains two boolean
   elements:





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      <siteSwitching>: if set to "true", it means that the media
      provider supports the site switching policy for the included media
      captures;

      <segmentSwitching>: if set to "true", it means that the media
      provider supports the segment switching policy for the included
      media captures.

   The "site-switch" policy means all captures are switched at the same
   time to keep captures from the same endpoint site together.

   The "segment-switch" policy means different captures can switch at
   different times, and can be coming from different endpoints.



   <!-- SWITCHING POLICIES TYPE -->
   <xs:complexType name="switchingPoliciesType">
    <xs:sequence>
     <xs:element name="siteSwitching" type="xs:boolean" minOccurs="0"/>
     <xs:element name="segmentSwitching" type="xs:boolean"
     minOccurs="0"/>
    </xs:sequence>
   </xs:complexType>


15.2.  <mediaCaptureIDs>

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



   <!-- CAPTURE ID LIST TYPE -->
   <xs:complexType name="captureIDListType">
    <xs:sequence>
     <xs:element name="captureIDREF" type="xs:IDREF"
     maxOccurs="unbounded"/>
    </xs:sequence>
   </xs:complexType>








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15.3.  sceneEntryID attribute

   The sceneEntryID attribute is a mandatory attribute containing the
   identifier of the capture scene entry represented by the <sceneEntry>
   element.

15.4.  mediaType attribute

   The mediaType attribute contains the media type of the media captures
   included in the scene entry.

16.  <encoding>

   The <encoding> element represents an individual encoding, i.e., a way
   to encode a media capture.  Individual encodings can be characterized
   with features that are independent from the specific type of medium,
   and with features that are media-specific.  We design the individual
   encoding type as an abstract type, providing all the features that
   can be common to all media types.  Media-specific individual
   encodings, such as video encodings, audio encodings and others, are
   specialization of that type, as in a typical generalization-
   specialization hierarchy.



   <!-- ENCODING TYPE -->
   <xs:complexType name="encodingType" abstract="true">
    <xs:sequence>
     <xs:element name="encodingName" type="xs:string"/>
     <xs:element name="maxBandwidth" type="xs:integer"/>
     <xs:any namespace="##other" processContents="lax" minOccurs="0"
     maxOccurs="unbounded"/>
    </xs:sequence>
    <xs:attribute name="encodingID" type="xs:ID" use="required"/>
    <xs:anyAttribute namespace="##any" processContents="lax"/>
   </xs:complexType>


16.1.  <encodingName>

   <encodingName> is a mandatory field containing the name of the
   encoding (e.g., G711, H264, ...).

16.2.  <maxBandwidth>

   <maxBandwidth> represent the maximum bitrate the media provider can
   instantiate for that encoding.




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16.3.  encodingID attribute

   The encodingID attribute is a mandatory attribute containing the
   identifier of the individual encoding.

17.  Audio encodings

   Audio encodings inherit all the features of a generic individual
   encoding and can present further audio-specific encoding
   characteristics.  The XML Schema definition of the audio encoding
   type is reported below:



   <!-- AUDIO ENCODING TYPE -->
   <xs:complexType name="audioEncodingType">
    <xs:complexContent>
     <xs:extension base="tns:encodingType">
      <xs:sequence>
       <xs:element name="encodedMedia" type="xs:string" fixed="audio"
       minOccurs="0"/>
      </xs:sequence>
     </xs:extension>
    </xs:complexContent>
   </xs:complexType>


   Up to now the only audio-specific information is the <encodedMedia>
   element containing the media type of the media captures that can be
   encoded with the considered individual encoding.  In the case of
   audio encoding, that element is forced to "audio".

18.  Video encodings

   Similarly to audio encodings, video encodings can extend the
   information of a generic individual encoding with video-specific
   encoding features, such as <maxWidth>, <maxHeight> and
   <maxFrameRate>.

   The <encodedMedia> element contains the media type of the media
   captures that can be encoded with the considered individual encoding.
   In the case of video encoding, that element is forced to "video".









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   <!-- VIDEO ENCODING TYPE -->
   <xs:complexType name="videoEncodingType">
    <xs:complexContent>
     <xs:extension base="tns:encodingType">
      <xs:sequence>
       <xs:element name="encodedMedia" type="xs:string" fixed="video"
       minOccurs="0"/>
       <xs:element name="maxWidth" type="xs:integer" minOccurs="0"/>
       <xs:element name="maxHeight" type="xs:integer" minOccurs="0"/>
       <xs:element name="maxFrameRate" type="xs:integer" minOccurs="0"/>
      </xs:sequence>
     </xs:extension>
    </xs:complexContent>
   </xs:complexType>


18.1.  <maxWidth>

   <maxWidth> represents the video resolution's maximum width supported
   by the video encoding, expressed in pixels.

   [edt note: not present in -09 version of the framework doc]

18.2.  <maxHeight>

   <maxHeight> representd the video resolution's maximum heith supported
   by the video encoding, expressed in pixels.

   [edt note: not present in -09 version of the framework doc]

18.3.  <maxFrameRate>

   <maxFrameRate> provides the maximum frame rate supported by the video
   encoding for the video capture to be encoded.

   [edt note: not present in -09 version of the framework doc]

19.  H26X encodings

   This is an example of how it is possible to further specialize the
   definition of a video individual encoding in order to cover encoding
   specific information.  A H26X video encoding can be represented
   through an element inheriting the video encoding characteristics
   described above (Section 18) and by adding other information such as
   <maxH26Xpps>, which represent the maximum number of pixels to be
   processed per second;.





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   <!-- H26X ENCODING TYPE -->
   <xs:complexType name="h26XEncodingType">
    <xs:complexContent>
     <xs:extension base="tns:videoEncodingType">
      <xs:sequence>
       <!-- max number of pixels to be processed per second -->
       <xs:element name="maxH26Xpps" type="xs:integer"
       minOccurs="0"/>
      </xs:sequence>
     </xs:extension>
    </xs:complexContent>
   </xs:complexType>


   [edt note: Need to be checked]

20.  <encodingGroup>

   The <encodingGroup> element represents an encoding group, which is a
   set of one or more individual encodings, and parameters that apply to
   the group as a whole.  The definition of the <encodingGroup> element
   is the following:



   <!-- ENCODING GROUP TYPE -->
   <xs:complexType name="encodingGroupType">
    <xs:sequence>
     <xs:element name="maxGroupBandwidth" type="xs:integer"/>
     <xs:element name="maxGroupPps" type="xs:integer"
     minOccurs="0"/>
     <xs:element name="encodingIDList" type="encodingIDListType"/>
     <xs:any namespace="##other" processContents="lax" minOccurs="0"
     maxOccurs="unbounded"/>
    </xs:sequence>
    <xs:attribute name="encodingGroupID" type="xs:ID" use="required"/>
    <xs:anyAttribute namespace="##any" processContents="lax"/>
   </xs:complexType>


   In the following, the contained elements are further described.

20.1.  <maxGroupBandwidth>

   <maxGroupBandwidth> is an optional field containing the maximum
   bitrate supported for all the individual encodings included in the
   encoding group.




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20.2.  <maxGroupPps>

   <maxGroupPps> is an optional field containing the maximum number of
   pixel per second for all the individual encodings included in the
   encoding group.

   [edt note: Need to be checked]

20.3.  <encodingIDList>

   <maxGroupBandwidth> is the list of the individual encoding grouped
   together.  Each individual encoding is represented through its
   identifier contained within an <encIDREF> element.



   <!-- ENCODING ID LIST TYPE -->
   <xs:complexType name="encodingIDListType">
    <xs:sequence>
     <xs:element name="encIDREF" type="xs:IDREF" maxOccurs="unbounded"/>
    </xs:sequence>
   </xs:complexType>


20.4.  encodingGroupID attribute

   The encodingGroupID attribute contains the identifier of the encoding
   group.

21.  <simultaneousSet>

   <simultaneousSet> represents a simultaneous set, i.e. a list of
   capture of the same type that cab be transmitted at the same time by
   a media provider.  There are different simultaneous transmission sets
   for each media type.



   <!-- SIMULTANEOUS SET TYPE -->
   <xs:complexType name="simultaneousSetType">
    <xs:sequence>
      <xs:element name="captureIDREF" type="xs:IDREF"
      minOccurs="0" maxOccurs="unbounded"/>
      <xs:element name="sceneEntryIDREF" type="xs:IDREF"
      minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
   </xs:complexType>




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   [edt note: need to be checked]

21.1.  <captureIDREF>

   <captureIDREF> contains the identifier of the media capture that
   belongs to the simultanous set.

21.2.  <sceneEntryIDREF>

   <captureIDREF> contains the identifier of the scene entry containing
   a group of capture that are able to be sent simultaneously with the
   other capture of the simultaneous set.

22.  <captureEncoding>

   A <captureEncoding> is given from the association of a media capture
   and an individual encoding, to form a capture stream.  It is defined
   as en element of the following type:



   <!-- CAPTURE ENCODING TYPE -->
   <xs:complexType name="captureEncodingType">
    <xs:sequence>
     <xs:element name="mediaCaptureID" type="xs:string"/>
     <xs:element name="encodingID" type="xs:string"/>
    </xs:sequence>
   </xs:complexType>


22.1.  <mediaCaptureID>

   <mediaCaptureID> contains the identifier of the media capture that
   has been encoded to form the capture encoding.

22.2.  <encodingID>

   <encodingID> contains the identifier of the applied individual
   encoding.

23.  <clueInfo>

   The <clueInfo> element has been left within the XML Schema for the
   sake of convenience when representing a prototype of ADVERTISEMENT
   message (see the example section).






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   <!-- CLUE INFO ELEMENT -->
   <!-- the <clueInfo> envelope can be seen
        as the ancestor of an <advertisement> envelope -->
   <xs:element name="clueInfo" type="clueInfoType"/>

   <!-- CLUE INFO TYPE -->
   <xs:complexType name="clueInfoType">
     <xs:sequence>
      <xs:element ref="mediaCaptures"/>
      <xs:element ref="encodings"/>
      <xs:element ref="encodingGroups"/>
      <xs:element ref="captureScenes"/>
      <xs:element ref="simultaneousSets"/>
      <xs:any namespace="##other" processContents="lax" minOccurs="0"
      maxOccurs="unbounded"/>
     </xs:sequence>
     <xs:attribute name="clueInfoID" type="xs:ID" use="required"/>
     <xs:anyAttribute namespace="##other" processContents="lax"/>
   </xs:complexType>


24.  Sample XML file

   The following XML document represents a schema compliant example of a
   CLUE telepresence scenario.

   There are 5 video captures:

   VC0:  the video from the left camera

   VC1:  the video from the central camera

   VC2:  the video from the right camera

   VC3:  the overall view of the telepresence room taken from the
      central camera

   VC4:  the video associated with the slide stream

   There are 2 audio captures:

   AC0:  the overall room audio taken from the central camera

   AC1:  the audio associated with the slide stream presentation

   The captures are organized into two capture scenes:





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   CS1:  this scene contains captures associated with the participants
      that are in the telepresence room.

   CS2:  this scene contains captures associated with the slide
      presentation, which is a pre-registered presentation played within
      the context of the telepresence session.

   Within the capture scene CS1, there are three scene entries
   available:

   CS1_SE1:  this entry contains the partipants' video captures taken
      from the three cameras (VC0, VC1, VC2).

   CS1_SE2:  this entry contains the zoomed-out view of the overall
      telepresence room (VC3)

   CS1_SE3:  this entry contains the overall telepresence room audio
      (AC0)

   On the other hand, capture scene CS2 presents two scene entries:

   CS2_SE1:  this entry contains the presentation audio stream (AC1)

   CS2_SE2:  this entry contains the presentation video stream (VC4)

   There are two encoding groups:

   EG0  This encoding groups involves video encodings ENC0, ENC1, ENC2

   EG1  This encoding groups involves audio encodings ENC3, ENC4

   As to the simultaneous sets, only VC1 and VC3 cannot be transmitted
   simultaneously since they are captured by the same device. i.e. the
   central camera (VC3 is a zoomed-out view while VC1 is a focused view
   of the front participants).  The simultaneous sets would then be the
   following:

   SS1  made by VC0, VC1, VC2, VC4, AC0, AC1

   SS2  made by VC0, VC3, VC2, VC4, AC0, AC1



 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <clueInfo xmlns="urn:ietf:params:xml:ns:clue-info" clueInfoID="prova">
     <mediaCaptures>
         <mediaCapture
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"



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         xsi:type="audioCaptureType" captureID="AC1">
             <capturedMedia>audio</capturedMedia>
             <captureSceneIDREF>CS2</captureSceneIDREF>
             <encGroupIDREF>EG1</encGroupIDREF>
             <nonSpatiallyDefinible>true</nonSpatiallyDefinible>
             <description lang="en">presentation audio</description>
             <content>slide</content>
             <audioChannelFormat>mono</audioChannelFormat>
         </mediaCapture>
         <mediaCapture
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:type="videoCaptureType" captureID="VC4">
             <capturedMedia>video</capturedMedia>
             <captureSceneIDREF>CS2</captureSceneIDREF>
             <encGroupIDREF>EG0</encGroupIDREF>
             <nonSpatiallyDefinible>true</nonSpatiallyDefinible>
             <description lang="en">presentation video</description>
             <content>slides</content>
         </mediaCapture>
         <mediaCapture
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:type="audioCaptureType" captureID="AC0">
             <capturedMedia>audio</capturedMedia>
             <captureSceneIDREF>CS1</captureSceneIDREF>
             <encGroupIDREF>EG1</encGroupIDREF>
             <spatialInformation>
                 <capturePoint>
                     <x>0.5</x>
                     <y>1.0</y>
                     <z>0.5</z>
                     <lineOfCapturePoint>
                         <x>0.5</x>
                         <y>0.0</y>
                         <z>0.5</z>
                     </lineOfCapturePoint>
                 </capturePoint>
             </spatialInformation>
             <description lang="en">
             audio from the central camera mic</description>
             <audioChannelFormat>mono</audioChannelFormat>
             <micPattern>figure8</micPattern>
         </mediaCapture>
         <mediaCapture
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:type="videoCaptureType" captureID="VC3">
             <capturedMedia>video</capturedMedia>
             <captureSceneIDREF>CS1</captureSceneIDREF>
             <encGroupIDREF>EG0</encGroupIDREF>



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             <spatialInformation>
                 <capturePoint>
                     <x>1.5</x>
                     <y>1.0</y>
                     <z>0.5</z>
                     <lineOfCapturePoint>
                         <x>1.5</x>
                         <y>0.0</y>
                         <z>0.5</z>
                     </lineOfCapturePoint>
                 </capturePoint>
                 <captureArea>
                     <bottomLeft>
                         <x>0.0</x>
                         <y>3.0</y>
                         <z>0.0</z>
                     </bottomLeft>
                     <bottomRight>
                         <x>3.0</x>
                         <y>3.0</y>
                         <z>0.0</z>
                     </bottomRight>
                     <topLeft>
                         <x>0.0</x>
                         <y>3.0</y>
                         <z>3.0</z>
                     </topLeft>
                     <topRight>
                         <x>3.0</x>
                         <y>3.0</y>
                         <z>3.0</z>
                     </topRight>
                 </captureArea>
             </spatialInformation>
             <description lang="en">
             zoomed out view of the room</description>
         </mediaCapture>
         <mediaCapture
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:type="videoCaptureType" captureID="VC2">
             <capturedMedia>video</capturedMedia>
             <captureSceneIDREF>CS1</captureSceneIDREF>
             <encGroupIDREF>EG0</encGroupIDREF>
             <spatialInformation>
                 <capturePoint>
                     <x>2.5</x>
                     <y>1.0</y>
                     <z>0.5</z>



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                     <lineOfCapturePoint>
                         <x>2.5</x>
                         <y>0.0</y>
                         <z>0.5</z>
                     </lineOfCapturePoint>
                 </capturePoint>
                 <captureArea>
                     <bottomLeft>
                         <x>2.0</x>
                         <y>3.0</y>
                         <z>0.0</z>
                     </bottomLeft>
                     <bottomRight>
                         <x>3.0</x>
                         <y>3.0</y>
                         <z>0.0</z>
                     </bottomRight>
                     <topLeft>
                         <x>2.0</x>
                         <y>3.0</y>
                         <z>3.0</z>
                     </topLeft>
                     <topRight>
                         <x>3.0</x>
                         <y>3.0</y>
                         <z>3.0</z>
                     </topRight>
                 </captureArea>
             </spatialInformation>
             <description lang="en">right camera video</description>
         </mediaCapture>
         <mediaCapture
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:type="videoCaptureType" captureID="VC1">
             <capturedMedia>video</capturedMedia>
             <captureSceneIDREF>CS1</captureSceneIDREF>
             <encGroupIDREF>EG0</encGroupIDREF>
             <spatialInformation>
                 <capturePoint>
                     <x>1.5</x>
                     <y>1.0</y>
                     <z>0.5</z>
                     <lineOfCapturePoint>
                         <x>1.5</x>
                         <y>0.0</y>
                         <z>0.5</z>
                     </lineOfCapturePoint>
                 </capturePoint>



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                 <captureArea>
                     <bottomLeft>
                         <x>1.0</x>
                         <y>3.0</y>
                         <z>0.0</z>
                     </bottomLeft>
                     <bottomRight>
                         <x>2.0</x>
                         <y>3.0</y>
                         <z>0.0</z>
                     </bottomRight>
                     <topLeft>
                         <x>1.0</x>
                         <y>3.0</y>
                         <z>3.0</z>
                     </topLeft>
                     <topRight>
                         <x>2.0</x>
                         <y>3.0</y>
                         <z>3.0</z>
                     </topRight>
                 </captureArea>
             </spatialInformation>
             <description lang="en">central camera video</description>
         </mediaCapture>
         <mediaCapture
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:type="videoCaptureType" captureID="VC0">
             <capturedMedia>video</capturedMedia>
             <captureSceneIDREF>CS1</captureSceneIDREF>
             <encGroupIDREF>EG0</encGroupIDREF>
             <spatialInformation>
                 <capturePoint>
                     <x>0.5</x>
                     <y>1.0</y>
                     <z>0.5</z>
                     <lineOfCapturePoint>
                         <x>0.5</x>
                         <y>0.0</y>
                         <z>0.5</z>
                     </lineOfCapturePoint>
                 </capturePoint>
                 <captureArea>
                     <bottomLeft>
                         <x>0.0</x>
                         <y>3.0</y>
                         <z>0.0</z>
                     </bottomLeft>



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                     <bottomRight>
                         <x>1.0</x>
                         <y>3.0</y>
                         <z>0.0</z>
                     </bottomRight>
                     <topLeft>
                         <x>0.0</x>
                         <y>3.0</y>
                         <z>3.0</z>
                     </topLeft>
                     <topRight>
                         <x>1.0</x>
                         <y>3.0</y>
                         <z>3.0</z>
                     </topRight>
                 </captureArea>
             </spatialInformation>
             <description lang="en">left camera video</description>
         </mediaCapture>
     </mediaCaptures>
     <encodings>
         <encoding xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:type="videoEncodingType" encodingID="ENC0">
             <encodingName>h263</encodingName>
             <maxBandwidth>4000000</maxBandwidth>
             <encodedMedia>video</encodedMedia>
             <maxWidth>1920</maxWidth>
             <maxHeight>1088</maxHeight>
         </encoding>
         <encoding xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:type="videoEncodingType" encodingID="ENC1">
             <encodingName>h263</encodingName>
             <maxBandwidth>4000000</maxBandwidth>
             <encodedMedia>video</encodedMedia>
             <maxWidth>1920</maxWidth>
             <maxHeight>1088</maxHeight>
         </encoding>
         <encoding xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:type="videoEncodingType" encodingID="ENC2">
             <encodingName>h263</encodingName>
             <maxBandwidth>4000000</maxBandwidth>
             <encodedMedia>video</encodedMedia>
             <maxWidth>1920</maxWidth>
             <maxHeight>1088</maxHeight>
         </encoding>
         <encoding xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:type="audioEncodingType" encodingID="ENC3">
             <encodingName>g711</encodingName>



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             <maxBandwidth>64000</maxBandwidth>
             <encodedMedia>audio</encodedMedia>
         </encoding>
         <encoding xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:type="audioEncodingType" encodingID="ENC4">
             <encodingName>g711</encodingName>
             <maxBandwidth>64000</maxBandwidth>
             <encodedMedia>audio</encodedMedia>
         </encoding>
     </encodings>
     <encodingGroups>
         <encodingGroup encodingGroupID="EG0">
             <maxGroupBandwidth>12000000</maxGroupBandwidth>
             <encodingIDList>
                 <encIDREF>ENC0</encIDREF>
                 <encIDREF>ENC1</encIDREF>
                 <encIDREF>ENC2</encIDREF>
             </encodingIDList>
         </encodingGroup>
         <encodingGroup encodingGroupID="EG1">
             <maxGroupBandwidth>12000000</maxGroupBandwidth>
             <encodingIDList>
                 <encIDREF>ENC3</encIDREF>
                 <encIDREF>ENC4</encIDREF>
             </encodingIDList>
         </encodingGroup>
     </encodingGroups>
     <captureScenes>
         <captureScene scale="unknown" sceneID="CS1">
             <description lang="en">main scene</description>
             <sceneSpace>
                 <bottomLeftFront>
                     <x>0.0</x>
                     <y>3.0</y>
                     <z>0.0</z>
                 </bottomLeftFront>
                 <bottomRightFront>
                     <x>3.0</x>
                     <y>3.0</y>
                     <z>0.0</z>
                 </bottomRightFront>
                 <topLeftFront>
                     <x>0.0</x>
                     <y>3.0</y>
                     <z>2.0</z>
                 </topLeftFront>
                 <topRightFront>
                     <x>3.0</x>



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                     <y>3.0</y>
                     <z>2.0</z>
                 </topRightFront>
                 <bottomLeftBack>
                     <x>0.0</x>
                     <y>3.0</y>
                     <z>0.0</z>
                 </bottomLeftBack>
                 <bottomRightBack>
                     <x>3.0</x>
                     <y>3.0</y>
                     <z>0.0</z>
                 </bottomRightBack>
                 <topLeftBack>
                     <x>0.0</x>
                     <y>3.0</y>
                     <z>2.0</z>
                 </topLeftBack>
                 <topRightBack>
                     <x>3.0</x>
                     <y>3.0</y>
                     <z>2.0</z>
                 </topRightBack>
             </sceneSpace>
             <sceneEntries>
                 <sceneEntry mediaType="video" sceneEntryID="SE1">
                     <description lang="en">
                     participants streams</description>
                     <mediaCaptureIDs>
                         <captureIDREF>VC0</captureIDREF>
                         <captureIDREF>VC1</captureIDREF>
                         <captureIDREF>VC2</captureIDREF>
                     </mediaCaptureIDs>
                 </sceneEntry>
                 <sceneEntry mediaType="video" sceneEntryID="SE2">
                     <description lang="en">room stream</description>
                     <mediaCaptureIDs>
                         <captureIDREF>VC3</captureIDREF>
                     </mediaCaptureIDs>
                 </sceneEntry>
                 <sceneEntry mediaType="audio" sceneEntryID="SE3">
                     <description lang="en">room audio</description>
                     <mediaCaptureIDs>
                         <captureIDREF>AC0</captureIDREF>
                     </mediaCaptureIDs>
                 </sceneEntry>
             </sceneEntries>
         </captureScene>



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         <captureScene scale="noscale" sceneID="CS2">
             <description lang="en">presentation</description>
             <sceneEntries>
                 <sceneEntry mediaType="video" sceneEntryID="CS2_SE1">
                     <description lang="en">
                     presentation video</description>
                     <mediaCaptureIDs>
                         <captureIDREF>VC4</captureIDREF>
                     </mediaCaptureIDs>
                 </sceneEntry>
                 <sceneEntry mediaType="audio" sceneEntryID="CS2_SE2">
                     <description lang="en">
                     presentation audio</description>
                     <mediaCaptureIDs>
                         <captureIDREF>AC1</captureIDREF>
                     </mediaCaptureIDs>
                 </sceneEntry>
             </sceneEntries>
         </captureScene>
     </captureScenes>
     <simultaneousSets>
         <simultaneousSet setID="SS1">
             <captureIDREF>VC0</captureIDREF>
             <captureIDREF>VC1</captureIDREF>
             <captureIDREF>VC2</captureIDREF>
             <captureIDREF>VC4</captureIDREF>
             <captureIDREF>AC0</captureIDREF>
             <captureIDREF>AC1</captureIDREF>
         </simultaneousSet>
         <simultaneousSet setID="SS2">
             <captureIDREF>VC0</captureIDREF>
             <captureIDREF>VC3</captureIDREF>
             <captureIDREF>VC2</captureIDREF>
             <captureIDREF>VC4</captureIDREF>
             <captureIDREF>AC0</captureIDREF>
             <captureIDREF>AC1</captureIDREF>
         </simultaneousSet>
     </simultaneousSets>
 </clueInfo>


25.  Diff with unofficial -02 version

   Here the link to the unofficial -02 version:
   http://www.grid.unina.it/Didattica/RetiDiCalcolatori
   /inf/draft-presta-clue-data-model-schema-02.html





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   <mediaCaptures> moved from <sceneEntry> to <clueInfo> elements.
      <mediaCaptures> have been moved out from the <captureScene> blob
      again.  Media captures should have identifiers that are valid out
      of the local scope of capture scenes, since a consumer should be
      able to require also single captures in the CONFIGURE message.
      This design choice reflects a bottom up approach where captures
      are the basis of the data model.  In each media capture a
      reference to the capture scene containing it is provided.  It
      identifies the space the spatial information of the media capture
      refers to.

   XML document example updated  A new example, compliant with the
      updated schema, has been provided.

   language attribute added to <mediaCapture>  Such optional attribute
      reflects the language used in the capture, if any.  The purpose of
      the element could match the one of the language attribute proposed
      in [I-D.groves-clue-capture-attr].

   <priority> added to <mediaCapture>  The priority element has an
      integer value helping in specifying a media capture relative
      importance with respect to the other captures.  That element could
      correspond to the priority attribute introduced in
      [I-D.groves-clue-capture-attr].

   <embeddedText> added to <videoCapture>  The element, if present,
      indicates text embedded in the video capture.  The language used
      in such embedded textual description is also envisioned within the
      <embeddedText> element itself.  That element could correspond to
      the priority attribute introduced in
      [I-D.groves-clue-capture-attr]

   <relatedTo> added to <mediaCapture>  That optional element contains
      the ID of a capture the capture refers to.  This is for supporting
      cases where there is the translation of a main capture in a
      different language.  Such translation can be marked with a
      <relatedTo> tag to refer to the main capture.  This could be
      interpreted the same manner of the supplementary information
      attribute proposed in [I-D.groves-clue-capture-attr] and further
      discussed in
      http://www.ietf.org/mail-archive/web/clue/current/msg02238.html.

   <dynamic> added to <mediaCapture>  That optional boolean element has
      the same purpose of the dynamic attribute proposed in
      [I-D.groves-clue-capture-attr].  It indicates if the capture
      device originating the capture moves during the telepresence
      session.




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   new element definition for <description>  <description> has a new
      attribute, lang, indicating the language used for the text within
      <description>. <description> is used to provide human readable
      information about captures, scene, and scene entries.  The
      definitions of the corresponding XML elements (i.e.,
      <mediaCapture>, <captureScene>, <sceneEntry>) have been updated to
      make them able to contain more than one <description>.  In that
      way, they can be described in different languages.

   text capture added as new type of capture  The element is just a
      place holder, since it is not characterized with any further
      information up to now.

26.  Diff with -02 version

   <sceneSpace> of capture space type  <sceneSpace> (was:<sceneArea>)
      describes a bounding volume for the space of a capture scene as an
      arbitrary hexahedrons with eight points (placeholder solution).

   H26X encoding  to be checked.

   Simultaneous sets  The XML Schema definition of the simultaneous sets
      has changed.  A simultaneous set is defined as a list of L media
      capture identifiers and M capture scene entrie identifiers, where
      L, M can be 0 or unbounded.

   Capture encoding  A new XML Schema type has been added to describe
      capture encodings as the result of the association of a media
      capture, represented by its identifier, with an individual
      encoding, represented by its identifier as well.

   Clue info  The <clueInfo> element has been left within the XML Schema
      for the sake of convenience when representing a prototype of
      ADVERTISEMENT message (see the example section).

   Data model definitions added  For each element of the datamodel a
      brief description has been reported to foster discussion.

27.  Informative References

   [I-D.groves-clue-capture-attr]  Groves, C., Yang, W., and R. Even,
                                   "CLUE media capture description",
                                   draft-groves-clue-capture-attr-01
                                   (work in progress), February 2013.

   [I-D.ietf-clue-framework]       Duckworth, M., Pepperell, A., and S.
                                   Wenger, "Framework for Telepresence
                                   Multi-Streams",



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                                   draft-ietf-clue-framework-09 (work in
                                   progress), February 2013.

   [I-D.romanow-clue-data-model]   Romanow, A. and A. Pepperell, "Data
                                   model for the CLUE Framework",
                                   draft-romanow-clue-data-model-01
                                   (work in progress), June 2012.

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

Authors' Addresses

   Roberta Presta
   University of Napoli
   Via Claudio 21
   Napoli  80125
   Italy

   EMail: roberta.presta@unina.it


   Simon Pietro Romano
   University of Napoli
   Via Claudio 21
   Napoli  80125
   Italy

   EMail: spromano@unina.it




















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