CLUE Working Group                                             R. Presta
Internet-Draft                                               S P. Romano
Intended status: Informational                      University of Napoli
Expires: August 6, 2013                                 February 2, 2013


                 An XML Schema for the CLUE data model
                 draft-presta-clue-data-model-schema-02

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 August 6, 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.






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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  XML Schema . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   4.  Sample XML file  . . . . . . . . . . . . . . . . . . . . . . . 11
   5.  Diff with unofficial -02 version . . . . . . . . . . . . . . . 19
   6.  Informative References . . . . . . . . . . . . . . . . . . . . 21











































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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 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 framework document.

3.  XML Schema

   This section contains the proposed CLUE data model schema definition.
   The overall structure of the CLUE data has been derived starting from
   a data type called "clueInfoType" which comprises the following
   subelements:

      mediaCaptures: the list of media captures available

      encodings: the list of individual encodings

      encodingGroups: the list of encodings which have been grouped
      together

      captureScenes: the list of capture scenes

      simultaneousSets: the list of simultaneous capture sets

   All of the above elements refer to concepts that have been introduced
   in [I-D.ietf-clue-framework] and [I-D.romanow-clue-data-model] and
   further detailed in threads on the mailing list.


<?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"



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   xmlns:xs="http://www.w3.org/2001/XMLSchema"
   xmlns="urn:ietf:params:xml:ns:clue-info"
   elementFormDefault="qualified"
   attributeFormDefault="unqualified">

      <!--This imports the xml:language definition-->
      <!-- <xs:import namespace="http://www.w3.org/XML/1998/namespace"
      schemaLocation="http://www.w3.org/2001/03/xml.xsd"/> -->

      <!-- CLUE INFO ELEMENT -->
      <xs:element name="clueInfo" type="clueInfoType"/>

      <!-- CLUE INFO TYPE -->
      <xs:complexType name="clueInfoType">
       <xs:sequence>
        <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: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>

     <!-- 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>



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         <!-- 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>

     <!-- 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>


     <!-- 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>



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     </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">
      <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">



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          <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="sceneArea" type="captureAreaType" 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"/>
        </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">



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        <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>

     <!-- 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>



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        <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>

      <!-- 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>

       <!-- H264 ENCODING TYPE -->
      <xs:complexType name="h264EncodingType">
       <xs:complexContent>
           <xs:extension base="tns:videoEncodingType">
            <xs:sequence>
             <xs:element name="maxH264MacroBlocksRate" type="xs:integer" minOccurs="0"/>
            </xs:sequence>
           </xs:extension>



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        </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>

       <!-- ENCODING GROUP TYPE -->
       <xs:complexType name="encodingGroupType">
        <xs:sequence>
         <xs:element name="maxGroupBandwidth" type="xs:integer"/>
         <xs:element name="maxGroupH264MacroBlockRate" 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:complexContent>
       <xs:extension base="captureIDListType">
        <xs:attribute name="setID" type="xs:ID" use="required"/>
       </xs:extension>
      </xs:complexContent>
     </xs:complexType>
   </xs:schema>






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4.  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:

   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:





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   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"?>
<?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" 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>



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                <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>
            <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>



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                        <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>
                    <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">



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            <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>
                <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>



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                    <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>
                    <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">



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            <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>
            <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>
            <sceneArea>
                <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>



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                <topLeft>
                    <x>0.0</x>
                    <y>3.0</y>
                    <z>2.0</z>
                </topLeft>
                <topRight>
                    <x>3.0</x>
                    <y>3.0</y>
                    <z>2.0</z>
                </topRight>
            </sceneArea>
            <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>
        <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>



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                </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>


5.  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

   <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.







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   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.

   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.

   <textCapture> 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.





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6.  Informative References

   [I-D.groves-clue-capture-attr]  Groves, C., Yang, W., and R. Even,
                                   "CLUE media capture description",
                                   draft-groves-clue-capture-attr-00
                                   (work in progress), September 2012.

   [I-D.ietf-clue-framework]       Duckworth, M., Pepperell, A., and S.
                                   Wenger, "Framework for Telepresence
                                   Multi-Streams",
                                   draft-ietf-clue-framework-08 (work in
                                   progress), December 2012.

   [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.

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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