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Versions: (draft-presta-clue-data-model-schema) 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 Draft is active
In: MissingRef
CLUE Working Group                                             R. Presta
Internet-Draft                                               S P. Romano
Intended status: Standards Track                    University of Napoli
Expires: October 3, 2015                                   April 1, 2015


                 An XML Schema for the CLUE data model
                  draft-ietf-clue-data-model-schema-08

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 October 3, 2015.

Copyright Notice

   Copyright (c) 2015 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 . . . . . . . . . . . . . . . . . . . . . . . . . .  7
   4.  <mediaCaptures>  . . . . . . . . . . . . . . . . . . . . . . . 18
   5.  <encodingGroups> . . . . . . . . . . . . . . . . . . . . . . . 18
   6.  <captureScenes>  . . . . . . . . . . . . . . . . . . . . . . . 18
   7.  <simultaneousSets> . . . . . . . . . . . . . . . . . . . . . . 18
   8.  <globalViews>  . . . . . . . . . . . . . . . . . . . . . . . . 18
   9.  <captureEncodings> . . . . . . . . . . . . . . . . . . . . . . 18
   10. <mediaCapture> . . . . . . . . . . . . . . . . . . . . . . . . 18
     10.1.  captureID attribute . . . . . . . . . . . . . . . . . . . 20
     10.2.  mediaType attribute . . . . . . . . . . . . . . . . . . . 20
     10.3.  <captureSceneIDREF> . . . . . . . . . . . . . . . . . . . 20
     10.4.  <encGroupIDREF> . . . . . . . . . . . . . . . . . . . . . 20
     10.5.  <spatialInformation>  . . . . . . . . . . . . . . . . . . 20
       10.5.1.  <capturePoint>  . . . . . . . . . . . . . . . . . . . 21
       10.5.2.  <captureArea> . . . . . . . . . . . . . . . . . . . . 22
     10.6.  <nonSpatiallyDefinable> . . . . . . . . . . . . . . . . . 23
     10.7.  <content> . . . . . . . . . . . . . . . . . . . . . . . . 23
     10.8.  <synchronizationID> . . . . . . . . . . . . . . . . . . . 24
     10.9.  <allowSubsetChoice> . . . . . . . . . . . . . . . . . . . 24
     10.10. <policy>  . . . . . . . . . . . . . . . . . . . . . . . . 24
     10.11. <maxCaptures> . . . . . . . . . . . . . . . . . . . . . . 25
     10.12. <individual>  . . . . . . . . . . . . . . . . . . . . . . 25
     10.13. <description> . . . . . . . . . . . . . . . . . . . . . . 25
     10.14. <priority>  . . . . . . . . . . . . . . . . . . . . . . . 26
     10.15. <lang>  . . . . . . . . . . . . . . . . . . . . . . . . . 26
     10.16. <mobility>  . . . . . . . . . . . . . . . . . . . . . . . 26
     10.17. <relatedTo> . . . . . . . . . . . . . . . . . . . . . . . 26
     10.18. <view>  . . . . . . . . . . . . . . . . . . . . . . . . . 27
     10.19. <presentation>  . . . . . . . . . . . . . . . . . . . . . 27
     10.20. <embeddedText>  . . . . . . . . . . . . . . . . . . . . . 27
     10.21. <capturedPeople>  . . . . . . . . . . . . . . . . . . . . 27
       10.21.1. <personIDREF> . . . . . . . . . . . . . . . . . . . . 27
   11. Audio captures . . . . . . . . . . . . . . . . . . . . . . . . 28
     11.1.  <sensitivityPattern>  . . . . . . . . . . . . . . . . . . 28
   12. Video captures . . . . . . . . . . . . . . . . . . . . . . . . 29
   13. Text captures  . . . . . . . . . . . . . . . . . . . . . . . . 29
   14. Other capture types  . . . . . . . . . . . . . . . . . . . . . 30
   15. <captureScene> . . . . . . . . . . . . . . . . . . . . . . . . 30
     15.1.  <sceneInformation>  . . . . . . . . . . . . . . . . . . . 31
     15.2.  <sceneViews>  . . . . . . . . . . . . . . . . . . . . . . 31
     15.3.  sceneID attribute . . . . . . . . . . . . . . . . . . . . 32
     15.4.  scale attribute . . . . . . . . . . . . . . . . . . . . . 32
   16. <sceneView>  . . . . . . . . . . . . . . . . . . . . . . . . . 32
     16.1.  <mediaCaptureIDs> . . . . . . . . . . . . . . . . . . . . 33
     16.2.  sceneViewID attribute . . . . . . . . . . . . . . . . . . 33
   17. <encodingGroup>  . . . . . . . . . . . . . . . . . . . . . . . 33



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     17.1.  <maxGroupBandwidth> . . . . . . . . . . . . . . . . . . . 34
     17.2.  <encodingIDList>  . . . . . . . . . . . . . . . . . . . . 34
     17.3.  encodingGroupID attribute . . . . . . . . . . . . . . . . 34
   18. <simultaneousSet>  . . . . . . . . . . . . . . . . . . . . . . 35
     18.1.  setID attribute . . . . . . . . . . . . . . . . . . . . . 35
     18.2.  mediaType attribute . . . . . . . . . . . . . . . . . . . 35
     18.3.  <mediaCaptureIDREF> . . . . . . . . . . . . . . . . . . . 36
     18.4.  <sceneViewIDREF>  . . . . . . . . . . . . . . . . . . . . 36
     18.5.  <captureSceneIDREF> . . . . . . . . . . . . . . . . . . . 36
   19. <globalView> . . . . . . . . . . . . . . . . . . . . . . . . . 36
   20. <people> . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
     20.1.  <person>  . . . . . . . . . . . . . . . . . . . . . . . . 37
       20.1.1.  personID attribute  . . . . . . . . . . . . . . . . . 38
       20.1.2.  <personInfo>  . . . . . . . . . . . . . . . . . . . . 38
       20.1.3.  <personType>  . . . . . . . . . . . . . . . . . . . . 38
   21. <captureEncoding>  . . . . . . . . . . . . . . . . . . . . . . 38
     21.1.  <captureID> . . . . . . . . . . . . . . . . . . . . . . . 39
     21.2.  <encodingID>  . . . . . . . . . . . . . . . . . . . . . . 39
     21.3.  <configuredContent> . . . . . . . . . . . . . . . . . . . 39
   22. <clueInfo> . . . . . . . . . . . . . . . . . . . . . . . . . . 39
   23. XML Schema extensibility . . . . . . . . . . . . . . . . . . . 40
     23.1.  Example of extension  . . . . . . . . . . . . . . . . . . 40
   24. Security considerations  . . . . . . . . . . . . . . . . . . . 42
   25. IANA considerations  . . . . . . . . . . . . . . . . . . . . . 43
     25.1.  XML namespace registration  . . . . . . . . . . . . . . . 43
     25.2.  XML Schema registration . . . . . . . . . . . . . . . . . 44
     25.3.  MIME Media Type Registration for
            'application/clue_info+xml' . . . . . . . . . . . . . . . 44
   26. Sample XML file  . . . . . . . . . . . . . . . . . . . . . . . 45
   27. MCC example  . . . . . . . . . . . . . . . . . . . . . . . . . 51
   28. Diff with draft-ietf-clue-data-model-schema-07 version . . . . 58
   29. Diff with draft-ietf-clue-data-model-schema-06 version . . . . 58
   30. Diff with draft-ietf-clue-data-model-schema-04 version . . . . 59
   31. Diff with draft-ietf-clue-data-model-schema-03 version . . . . 60
   32. Diff with  draft-ietf-clue-data-model-schema-02 version  . . . 60
   33. Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 60
   34. Informative References . . . . . . . . . . . . . . . . . . . . 60














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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].  It encodes information and constraints
   defined in the aforementioned document 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 document.

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

2.  Terminology

   This document refers to the same terminology used in
   [I-D.ietf-clue-framework], except for the "CLUE Participant"
   definition (which is still under discussion).  We briefly recall
   herein some of the main terms exploited in the document.

   Audio Capture:  Media Capture for audio.  Denoted as ACn in the
      example cases in this document.

   Camera-Left and Right:  For Media Captures, Camera-Left and Camera-
      Right are from the point of view of a person observing the
      rendered media.  They are the opposite of Stage-Left and Stage-
      Right.

   Capture:  Same as Media Capture.

   Capture Device:  A device that converts audio and video input into an
      electrical signal, in most cases to be fed into a media encoder.

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





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   Capture Scene:  An abstraction grouping semantically-coupled Media
      Captures available at the Media Provider's side, representing a
      precise portion of the local scene that can be transmitted
      remotely.  Capture Scene MAY correspond to a part of the
      telepresence room or MAY focus only on the presentation media.  A
      Capture Scene is characterized by a set of attributes and by a set
      of Capture Scene Views.

   Capture Scene View:  A list of Media Captures of the same media type
      that constitute a possible representation of a Capture Scene.
      Media Capture belonging to the same Capture Scene View can be sent
      simultaneously by the Media Provider.

   CLUE Participant:  This term is not imported from the framework
      terminology and should be considered temporary since it is under
      review.  We introduced it for the sake of simplicity in order to
      identify a generic entity (either an Endpoint or a MCU) making use
      of the CLUE protocol.

   Consumer:  Same as Media Consumer.

   Encoding or Individual Encoding:  The representation of an encoding
      technology.  In the CLUE datamodel, for each encoding it is
      provided a set of parameters representing the encoding
      constraints, like for example the maximum bandwidth of the Media
      Provider the encoding can consume.

   Encoding Group:  The representation of a group of encodings.  For
      each group, it is provided a set of parameters representing the
      constraints to be applied to the group as a whole.  An example is
      the maximum bandwidth that can be consumed when using the
      contained encodings together simultaneously.

   Endpoint  The logical point of final termination through receiving,
      decoding and rendering, and/or initiation through capturing,
      encoding, and sending of media streams.  An endpoint consists of
      one or more physical devices which source and sink media streams,
      and exactly one SIP Conferencing Framework Participant (which, in
      turn, includes exactly one SIP User Agent).  Endpoints can be
      anything from multiscreen/multicamera room controllers to handheld
      devices.

   MCU:  Multipoint Control Unit (MCU) - a device that connects two or
      more endpoints together into one single multimedia conference.  An
      MCU may include a Mixer.






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

   Media Capture:  A "Media Capture", or simply "Capture", is a source
      of Media of a single type (i.e., audio or video or text).

   Media Stream:  The term "Media Stream", or simply "Stream", is used
      as a synonymous of Capture Encoding.

   Media Provider:  A CLUE participant (i.e., an Endpoint or a MCU) able
      to send Media Streams.

   Media Consumer:  A CLUE participant (i.e., an Endpoint or a MCU) able
      to receive Media Streams.

   Scene:  Same as Capture Scene.

   Scene View:  Same as Capture Scene View.

   Stream:  Same of Media Stream.

   Multiple Content Capture:  A Capture that can contain different Media
      Captures of the same media type.  It is denoted as MCC in this
      document.  In the Stream resulting from the MCC, the Stream coming
      from the encoding of the composing Media Captures can appear
      simultaneously, if the MCC is the result of a mixing operation, or
      can appear alternatively over the time, according to a certain
      switching policy.

   Plane of Interest:  The spatial plane containing the most relevant
      subject matter.

   Provider:  Same as Media Provider.

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

   Simultaneous Transmission Set:  a set of Media Captures of the same
      media type that can be transmitted simultaneously from a Media
      Provider.

   Single Media Capture:  A Capture representing the Media coming from a
      single-source Capture Device.






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   Spatial Information:  Data about the spatial position of a Capture
      Device that generate a Single Media Capture within the context of
      a Capture Scene representing a phisical portion of a Telepresence
      Room.

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

   Video Capture:  A Media Capture for video.

3.  XML Schema

   This section contains the 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 streams that are requested by a Media Consumer given the
   Media Provider's ADVERTISEMENT ([I-D.ietf-clue-protocol]).

   The main groups of information are:

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

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

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

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

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

      <people>: meta data about the participants represented in the
      telepresence session (Section 20).

      <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 further detailed 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"



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   xmlns="urn:ietf:params:xml:ns:clue-info"
   xmlns:xcard="urn:ietf:params:xml:ns:vcard-4.0"
   elementFormDefault="qualified"
   attributeFormDefault="unqualified"
   version="0.7">

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


<!-- ELEMENT DEFINITIONS -->
<xs:element name="mediaCaptures" type="mediaCapturesType"/>
<xs:element name="encodingGroups" type="encodingGroupsType"/>
<xs:element name="captureScenes" type="captureScenesType"/>
<xs:element name="simultaneousSets" type="simultaneousSetsType"/>
<xs:element name="globalViews" type="globalViewsType"/>
<xs:element name="people" type="peopleType"/>

<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="captureSceneIDREF" type="xs:IDREF"/>



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    <xs:choice>
      <xs:sequence>
        <xs:element name="spatialInformation"
                    type="tns:spatialInformationType"/>
      </xs:sequence>
      <xs:element name="nonSpatiallyDefinable" type="xs:boolean" fixed="true"/>
    </xs:choice>
    <!-- for handling multi-content captures: -->
    <xs:choice>
      <xs:sequence>
        <xs:element name="synchronizationID" type="xs:ID" minOccurs="0"/>
        <xs:element name="content" type="contentType" minOccurs="0"/>
        <xs:element name="policy" type="xs:string" minOccurs="0"/>
        <xs:element name="maxCaptures" type="maxCapturesType" minOccurs="0"/>
        <xs:element name="allowSubsetChoice" type="xs:boolean" minOccurs="0"/>
      </xs:sequence>
      <xs:element name="individual" type="xs:boolean" fixed="true"/>
    </xs:choice>
    <!-- optional fields -->
    <xs:element name="encGroupIDREF" type="xs:IDREF" minOccurs="0"/>
    <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
    <xs:element name="priority" type="xs:unsignedInt" minOccurs="0"/>
    <xs:element name="lang" type="xs:language" minOccurs="0"/>
    <xs:element name="mobility" type="mobilityType" minOccurs="0"/>
    <xs:element name="presentation" type="presentationType" minOccurs="0"/>
    <xs:element ref="embeddedText" minOccurs="0"/>
    <xs:element name="view" type="viewType" minOccurs="0"/>
    <xs:element name="capturedPeople" type="capturedPeopleType" minOccurs="0"/>
    <xs:element name="relatedTo" type="xs:IDREF" minOccurs="0"/>
  </xs:sequence>
  <xs:attribute name="captureID" type="xs:ID" use="required"/>
  <xs:attribute name="mediaType" type="xs:string" use="required"/>

</xs:complexType>


<!-- CONTENT TYPE -->
<xs:complexType name="contentType">
 <xs:sequence>
   <xs:element name="captureIDREF" type="xs:IDREF"
   minOccurs="0" maxOccurs="unbounded"/>
   <xs:element name="sceneViewIDREF" type="xs:IDREF"
   minOccurs="0" maxOccurs="unbounded"/>
   <xs:any namespace="##other" processContents="lax" minOccurs="0"
   maxOccurs="unbounded"/>
 </xs:sequence>
 <xs:anyAttribute namespace="##other" processContents="lax"/>
</xs:complexType>



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<!-- MAX CAPTURES TYPE -->
<xs:complexType name="maxCapturesType">
  <xs:simpleContent>
    <xs:extension base="xs:unsignedInt">
      <xs:attribute name="exactNumber" type="xs:boolean"/>
    </xs:extension>
  </xs:simpleContent>
</xs:complexType>

<!-- CAPTURED PEOPLE TYPE -->
<xs:complexType name="capturedPeopleType">
<xs:sequence>
<xs:element name="personIDREF" type="xs:IDREF" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>

<!-- PEOPLE TYPE -->
<xs:complexType name="peopleType">
<xs:sequence>
<xs:element name="person" type="personType"
                    maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>

<!-- PERSON TYPE -->
<xs:complexType name="personType">
  <xs:sequence>
     <xs:element name="personInfo" type="xcard:vcardType" maxOccurs="1"
                         minOccurs="0"/>
     <xs:element name="personType" type="personTypeType"
                         minOccurs="0"
                 maxOccurs="unbounded"/>
     <xs:any namespace="##other" processContents="lax" minOccurs="0"
                 maxOccurs="unbounded"/>
  </xs:sequence>
  <xs:attribute name="personID" type="xs:ID" use="required"/>
  <xs:anyAttribute namespace="##other" processContents="lax"/>
</xs:complexType>

<!-- PERSON TYPE TYPE -->
<xs:simpleType name="personTypeType">
        <xs:restriction base="xs:string">
        <xs:enumeration value="chairman"/>
        <xs:enumeration value="vice-chairman"/>
        <xs:enumeration value="minute taker"/>
        <xs:enumeration value="presenter"/>
        <xs:enumeration value="translator"/>
        <xs:enumeration value="timekeeper"/>



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        <xs:enumeration value="attendee"/>
        </xs:restriction>
</xs:simpleType>



<!-- VIEW TYPE -->
<xs:simpleType name="viewType">
 <xs:restriction base="xs:string">
  <xs:enumeration value="room"/>
  <xs:enumeration value="table"/>
  <xs:enumeration value="lectern"/>
  <xs:enumeration value="individual"/>
  <xs:enumeration value="audience"/>
 </xs:restriction>
</xs:simpleType>

<!-- PRESENTATION TYPE -->
<xs:simpleType name="presentationType">
 <xs:restriction base="xs:string">
  <xs:enumeration value="slides"/>
  <xs:enumeration value="image"/>
  <xs:enumeration value=""/>
 </xs:restriction>
</xs:simpleType>

<!-- SPATIAL INFORMATION TYPE -->
<xs:complexType name="spatialInformationType">
 <xs:sequence>
  <xs:element name="capturePoint" type="capturePointType" minOccurs="0"/>
  <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>

<!-- MOBILITY TYPE -->
<xs:simpleType name="mobilityType">
 <xs:restriction base="xs:string">
  <xs:enumeration value="static"/>
  <xs:enumeration value="dynamic"/>
  <xs:enumeration value="highly-dynamic"/>
 </xs:restriction>
</xs:simpleType>

<!-- TEXT CAPTURE TYPE -->
<xs:complexType name="textCaptureType">



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 <xs:complexContent>
  <xs:extension base="tns:mediaCaptureType">
  <xs:sequence>
  <xs:any namespace="##other" processContents="lax" minOccurs="0"
    maxOccurs="unbounded"/>
  </xs:sequence>
  <xs:anyAttribute namespace="##other" processContents="lax"/>
  </xs:extension>
 </xs:complexContent>
</xs:complexType>


<!-- OTHER CAPTURE TYPE -->
<xs:complexType name="otherCaptureType">
 <xs:complexContent>
  <xs:extension base="tns:mediaCaptureType">
  <xs:sequence>
  <xs:any namespace="##other" processContents="lax" minOccurs="0"
    maxOccurs="unbounded"/>
  </xs:sequence>
  </xs:extension>
 </xs:complexContent>
</xs:complexType>

<!-- AUDIO CAPTURE TYPE -->
<xs:complexType name="audioCaptureType">
 <xs:complexContent>
  <xs:extension base="tns:mediaCaptureType">
   <xs:sequence>
    <xs:element name="sensitivyPattern" type="sensitivyPatternType"
    minOccurs="0"/>
    <xs:any namespace="##other" processContents="lax" minOccurs="0"
    maxOccurs="unbounded"/>
   </xs:sequence>
   <xs:anyAttribute namespace="##other" processContents="lax"/>
  </xs:extension>
 </xs:complexContent>
</xs:complexType>


<!-- SENSITIVITY PATTERN TYPE -->
<xs:simpleType name="sensitivyPatternType">
 <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"/>



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  <xs:enumeration value="hyper-cardioid"/>
 </xs:restriction>
</xs:simpleType>


<!-- VIDEO CAPTURE TYPE -->
<xs:complexType name="videoCaptureType">
 <xs:complexContent>
  <xs:extension base="tns:mediaCaptureType">
   <xs:sequence>
    <xs:any namespace="##other" processContents="lax" minOccurs="0"
    maxOccurs="unbounded"/>
   </xs:sequence>
   <xs:anyAttribute namespace="##other" processContents="lax"/>
  </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">
 <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="sceneInformation" type="xcard:vcardType" minOccurs="0"/>
  <xs:element name="sceneViews" type="sceneViewsType" minOccurs="0"/>
  <xs:any namespace="##other" processContents="lax" minOccurs="0"
  maxOccurs="unbounded"/>
 </xs:sequence>
 <xs:attribute name="sceneID" type="xs:ID" use="required"/>



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 <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="mm"/>
  <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">
 <xs:complexContent>
  <xs:extension base="pointType">
   <xs:sequence>
    <xs:element name="lineOfCapturePoint" type="tns:pointType"
    minOccurs="0"/>
   </xs:sequence>
   <xs:anyAttribute namespace="##any" processContents="lax"/>
  </xs:extension>
 </xs:complexContent>
</xs:complexType>


<!-- SCENE VIEWS TYPE -->
<!-- envelope of scene views of a capture scene -->



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<xs:complexType name="sceneViewsType">
 <xs:sequence>
  <xs:element name="sceneView" type="sceneViewType"
  maxOccurs="unbounded"/>
 </xs:sequence>
</xs:complexType>

<!-- SCENE VIEW TYPE -->
<xs:complexType name="sceneViewType">
 <xs:sequence>
  <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
  <xs:element name="mediaCaptureIDs" type="captureIDListType"/>
 </xs:sequence>
 <xs:attribute name="sceneViewID" type="xs:ID" use="required"/>
</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>

<!-- 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:unsignedLong"/>
  <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>



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  <xs:element name="encID" type="xs:string" 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="mediaCaptureIDREF" type="xs:IDREF"
   minOccurs="0" maxOccurs="unbounded"/>
   <xs:element name="sceneViewIDREF" type="xs:IDREF"
   minOccurs="0" maxOccurs="unbounded"/>
   <xs:element name="captureSceneIDREF" type="xs:IDREF"
   minOccurs="0" maxOccurs="unbounded"/>
   <xs:any namespace="##other" processContents="lax" minOccurs="0"
   maxOccurs="unbounded"/>
 </xs:sequence>
 <xs:attribute name="setID" type="xs:ID" use="required"/>
 <xs:attribute name="mediaType" type="xs:string"/>
 <xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>

<!-- GLOBAL VIEWS TYPE -->
<xs:complexType name="globalViewsType">
 <xs:sequence>
  <xs:element name="globalView" type="globalViewType"
  maxOccurs="unbounded"/>
 </xs:sequence>
</xs:complexType>

<!-- GLOBAL VIEW TYPE -->
<xs:complexType name="globalViewType">
 <xs:sequence>
   <xs:element name="sceneViewIDREF" type="xs:IDREF"
    maxOccurs="unbounded"/>
   <xs:any namespace="##other" processContents="lax" minOccurs="0"
   maxOccurs="unbounded"/>
 </xs:sequence>
 <xs:attribute name="globalViewID" type="xs:ID"/>
 <xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>



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<!-- CAPTURE ENCODINGS TYPE -->
<xs:complexType name="captureEncodingsType">
 <xs:sequence>
  <xs:element name="captureEncoding" type="captureEncodingType"
  maxOccurs="unbounded"/>
 </xs:sequence>
</xs:complexType>

<!-- CAPTURE ENCODING TYPE -->
<xs:complexType name="captureEncodingType">
 <xs:sequence>
  <xs:element name="captureID" type="xs:string"/>
  <xs:element name="encodingID" type="xs:string"/>
  <xs:element name="configuredContent" type="contentType" minOccurs="0"/>
  <xs:any namespace="##other" processContents="lax" minOccurs="0"
   maxOccurs="unbounded"/>
 </xs:sequence>
 <xs:attribute name="ID" type="xs:ID"/>
 <xs:anyAttribute namespace="##any" processContents="lax"/>
</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="encodingGroups"/>
   <xs:element ref="captureScenes"/>
   <xs:element ref="simultaneousSets" minOccurs="0"/>
   <xs:element ref="globalViews" minOccurs="0"/>
   <xs:element ref="people" minOccurs="0"/>
   <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.






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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.  <encodingGroups>

   <encodingGroups> represents the list of the encoding groups organized
   on the Media Provider's side.  Each encoding group is represented by
   a <encodingGroup> element (Section 17).

6.  <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 15).

7.  <simultaneousSets>

   <simultaneousSets> contains the simultaneous sets indicated by the
   Media Provider.  Each simultaneous set is represented by a
   <simultaneousSet> element.  (Section 18).

8.  <globalViews>

   <globalViews> contains a set of alternative representations of all
   the scenes that are offered by a Media Provider to a Media Consumer.
   Each alternative is named "global view" and it is represented by a
   <globalView> element.  (Section 19).

9.  <captureEncodings>

   <captureEncodings> is a list of capture encodings.  It can represent
   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 21).

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 (i) by a set of features that
   are independent from the specific type of medium, and (ii) by a set
   of features that are media-specific.  The features that are common to
   all media types appear within the media capture type, that has been
   designed as an abstract complex type.  Media-specific captures, such



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   as video captures, audio captures and others, are specialization of
   that abstract media capture type, as in a typical generalization-
   specialization hierarchy.

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



<!-- MEDIA CAPTURE TYPE -->
<xs:complexType name="mediaCaptureType" abstract="true">
  <xs:sequence>
    <!-- mandatory fields -->
    <xs:element name="captureSceneIDREF" type="xs:IDREF"/>
    <xs:choice>
      <xs:sequence>
        <xs:element name="spatialInformation"
                    type="tns:spatialInformationType"/>
      </xs:sequence>
      <xs:element name="nonSpatiallyDefinable" type="xs:boolean" fixed="true"/>
    </xs:choice>
    <!-- for handling multi-content captures: -->
    <xs:choice>
      <xs:sequence>
        <xs:element name="synchronizationID" type="xs:ID" minOccurs="0"/>
        <xs:element name="content" type="contentType" minOccurs="0"/>
        <xs:element name="policy" type="xs:string" minOccurs="0"/>
        <xs:element name="maxCaptures" type="maxCapturesType" minOccurs="0"/>
        <xs:element name="allowSubsetChoice" type="xs:boolean" minOccurs="0"/>
      </xs:sequence>
      <xs:element name="individual" type="xs:boolean" fixed="true"/>
    </xs:choice>
    <!-- optional fields -->
    <xs:element name="encGroupIDREF" type="xs:IDREF" minOccurs="0"/>
    <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
    <xs:element name="priority" type="xs:unsignedInt" minOccurs="0"/>
    <xs:element name="lang" type="xs:language" minOccurs="0"/>
    <xs:element name="mobility" type="mobilityType" minOccurs="0"/>
    <xs:element name="presentation" type="presentationType" minOccurs="0"/>
    <xs:element name="view" type="viewType" minOccurs="0"/>
    <xs:element name="capturedPeople" type="capturedPeopleType" minOccurs="0"/>
    <xs:element name="relatedTo" type="xs:IDREF" minOccurs="0"/>
  </xs:sequence>
  <xs:attribute name="captureID" type="xs:ID" use="required"/>
  <xs:attribute name="mediaType" type="xs:string" use="required"/>

</xs:complexType>





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10.1.  captureID attribute

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

10.2.  mediaType attribute

   The "mediaType" attribute is a mandatory attribute specifying the
   media type of the capture ("audio", "video", "text",...).

10.3.  <captureSceneIDREF>

   <captureSceneIDREF> is a mandatory field containing the identifier of
   the capture scene the media capture is defined in.  Indeed, each
   media capture must be defined within one and only one capture scene.
   When a media capture is spatially definable, some spatial information
   is provided along with it in the form of point coordinates (see
   Section 10.5).  Such coordinates refers to the space of coordinates
   defined for the capture scene containing the capture.

10.4.  <encGroupIDREF>

   <encGroupIDREF> is an optional field containing the identifier of the
   encoding group the media capture is associated with.  Media captures
   that are not associated with any encoding group can not be
   instantiated as media streams.

10.5.  <spatialInformation>

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

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

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



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

   The definition of the spatial information type is the following:



<!-- SPATIAL INFORMATION TYPE -->
<xs:complexType name="spatialInformationType">
 <xs:sequence>
  <xs:element name="capturePoint" type="capturePointType" minOccurs="0"/>
  <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 10.5.1).

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

10.5.1.  <capturePoint>

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

   The XML Schema definition of the <capturePoint> element type is the
   following:






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   <!-- 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:anyAttribute namespace="##any" processContents="lax"/>
     </xs:extension>
    </xs:complexContent>
   </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.

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

10.5.2.  <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. <captureArea> MUST be
   included in the spatial information of spatially definable video



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   capture, while MUST NOT be associated to audio captures.

   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> MUST be co-
   planar.

10.6.  <nonSpatiallyDefinable>

   When media captures are non spatially definable, they are marked with
   the boolean <nonSpatiallyDefinable> element set to "true" and no
   <spatialInformation> is provided.  Indeed, <nonSpatiallyDefinable>
   and <spatialInformation> are mutually exclusive tag, according to the
   <choice> section within the XML Schema definition of the media
   capture type.

10.7.  <content>

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




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   <!-- CONTENT TYPE -->
   <xs:complexType name="contentType">
    <xs:sequence>
      <xs:element name="captureIDREF" type="xs:IDREF"
      minOccurs="0" maxOccurs="unbounded"/>
      <xs:element name="sceneViewIDREF" type="xs:IDREF"
      minOccurs="0" maxOccurs="unbounded"/>
      <xs:any namespace="##other" processContents="lax" minOccurs="0"
      maxOccurs="unbounded"/>
    </xs:sequence>
    <xs:anyAttribute namespace="##other" processContents="lax"/>
   </xs:complexType>


10.8.  <synchronizationID>

   <synchronizationID> is an optional element for multiple content
   captures that contains a numeric identifier.  Multiple content
   captures marked with the same identifier in the <synchronizationID>
   contain at each time captures coming from the same source.  It is the
   MP that determines what the source for the captures is.  By this way,
   the MP can choose how to group together single captures for the
   purpose of keeping them synchronized according to the
   SynchronisationID attribute.

10.9.  <allowSubsetChoice>

   <allowSubsetChoice> is an optional boolean element for multiple
   content captures.  It indicates whether or not the Provider allows
   the Consumer to choose a specific subset of the captures referenced
   by the MCC.  If this attribute is true, and the MCC references other
   Captures, then the Consumer MAY specify in a CONFIGURE message a
   specific subset of those captures to be included in the MCC, and the
   Provider MUST then include only that subset.  If this attribute is
   false, or the MCC does not reference other captures, then the
   Consumer MUST NOT select a subset.

10.10.  <policy>

   <policy> is an optional element that can be used only for multiple
   content captures.  It indicates the criteria applied to build the
   multiple content capture using the media captures referenced in
   <contentCaptureIDs>.  Such element can assume a list of pre-defined
   values ([todo]).







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10.11.  <maxCaptures>

   <maxCaptures> is an optional element that can be used only for
   multiple content captures.  It provides information about the number
   of media captures that can be represented in the multiple content
   capture at a time.  The type definition is provided below.



   <!-- MAX CAPTURES TYPE -->
   <xs:complexType name="maxCapturesType">
     <xs:simpleContent>
       <xs:extension base="xs:unsignedInt">
         <xs:attribute name="exactNumber" type="xs:boolean"/>
       </xs:extension>
     </xs:simpleContent>
   </xs:complexType>


   When the "exactNumber" attribute is set to "1", it means the
   <maxCaptures> element carries the exact number of the media captures
   appearing at a time.  Otherwise, the number of the represented media
   captures MUST be considered "<=" of the <maxCaptures> value.

10.12.  <individual>

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

10.13.  <description>

   <description> is used to provide optionally human-readable textual
   information about a media capture.  The same element is exploited to
   describe, besides media captures, capture scenes and capture scene
   views, as it is included in their XML representation.  A media
   capture can be described by using multiple <description> elements,
   each one providing information in a different language.  The
   <description> element definition is the following:








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   <!-- 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.

10.14.  <priority>

   <priority> is an optional unsigned 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 relevant contribution from the Media Provider.  The
   higher the importance, the lower the contained value.  When media
   captures are marked with a "0" priority value, it means that they are
   "not subject to priority".

10.15.  <lang>

   <lang> is an optional element containing the language used in the
   capture, if any.

10.16.  <mobility>

   <mobility> is an optional element indicating whether or not the
   capture device originating the capture may move during the
   telepresence session.  That optional element can assume one of the
   three following values: (i) static, (ii) dynamic or (iii) highly
   dynamic.

10.17.  <relatedTo>

   The optional <relatedTo> element contains the value of the ID
   attribute of the media capture it refers to.  The media capture
   marked with a <relatedTo> element can be for example the translation
   of a main media capture in a different language.






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10.18.  <view>

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

10.19.  <presentation>

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

10.20.  <embeddedText>

   The <embeddedText> element is a boolean element indicating that there
   is text embedded in the media capture (e.g., in a 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>


10.21.  <capturedPeople>

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

10.21.1.  <personIDREF>

   <personIDREF> contains the identifier of the represented person.
   Metadata about the represented participant can be retrieved by
   accessing the <people> list (Section 20).



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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="sensitivyPattern" type="sensitivyPatternType"
       minOccurs="0"/>
       <xs:any namespace="##other" processContents="lax" minOccurs="0"
       maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:anyAttribute namespace="##other" processContents="lax"/>
     </xs:extension>
    </xs:complexContent>
   </xs:complexType>


   An example of audio-specific information that can be included is
   represented by the <sensitivyPattern> element.  (Section 11.1).

11.1.  <sensitivityPattern>

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

   The XML Schema definition is provided below:



   <xs:simpleType name="sensitivyPatternType">
    <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>




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12.  Video captures

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

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



   <!-- VIDEO CAPTURE TYPE -->
   <xs:complexType name="videoCaptureType">
    <xs:complexContent>
     <xs:extension base="tns:mediaCaptureType">
      <xs:sequence>
       <xs:any namespace="##other" processContents="lax" minOccurs="0"
       maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:anyAttribute namespace="##other" processContents="lax"/>
     </xs:extension>
    </xs:complexContent>
   </xs:complexType>


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:sequence>
     <xs:any namespace="##other" processContents="lax" minOccurs="0"
       maxOccurs="unbounded"/>
     </xs:sequence>
     <xs:anyAttribute namespace="##other" processContents="lax"/>
     </xs:extension>
    </xs:complexContent>
   </xs:complexType>




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14.  Other capture types

   Other media capture types can be described by using the CLUE data
   model.  They can be represented by exploiting "otherCaptureType"
   type.  This media capture type is conceived to be filled with
   elements defined within extensions of the current schema, i.e., with
   elements defined in other XML schemas (see Section 23 for an
   example).  The otherCaptureType inherits all the features envisioned
   for the abstract mediaCaptureType.

   The XML Schema representation of the otherCaptureType is the
   following:



   <!-- OTHER CAPTURE TYPE -->
   <xs:complexType name="otherCaptureType">
    <xs:complexContent>
     <xs:extension base="tns:mediaCaptureType">
     <xs:sequence>
     <xs:any namespace="##other" processContents="lax" minOccurs="0"
       maxOccurs="unbounded"/>
     </xs:sequence>
     <xs:anyAttribute namespace="##other" processContents="lax"/>
     </xs:extension>
    </xs:complexContent>
   </xs:complexType>


15.  <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 media captures
   and capture scene views, that are set of media captures of the same
   media type.  Each capture scene view is an alternative to represent
   completely a capture scene for a fixed media type.

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











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<!-- CAPTURE SCENE TYPE -->
<xs:complexType name="captureSceneType">
 <xs:sequence>
  <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
  <xs:element name="sceneInformation" type="xcard:vcardType" minOccurs="0"/>
  <xs:element name="sceneViews" type="sceneViewsType" minOccurs="0"/>
  <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>


   Each capture scene is identified by a "sceneID" attribute.  The
   <captureScene> element can contain zero or more textual <description>
   elements, defined as in Section 10.13.  Besides <description>, there
   is the optional <sceneInformation> element (Section 15.1), which
   contains structured information about the scene in the vcard format,
   and the optional <sceneViews> element (Section 15.2), which is the
   list of the capture scene views.  When no <sceneViews> is provided,
   the capture scene is assumed to be made by all the media captures
   showing the value of its sceneID attribute in their mandatory
   captureSceneIDREF attribute.

15.1.  <sceneInformation>

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

15.2.  <sceneViews>

   The <sceneViews> element is a mandatory field of a capture scene
   containing the list of scene views.  Each scene view is represented
   by a <sceneView> element (Section 16).



   <!-- SCENE VIEWS TYPE -->
   <!-- envelope of scene views of a capture scene -->
   <xs:complexType name="sceneViewsType">
    <xs:sequence>
     <xs:element name="sceneView" type="sceneViewType"
     maxOccurs="unbounded"/>
    </xs:sequence>
   </xs:complexType>




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15.3.  sceneID attribute

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

15.4.  scale attribute

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

      "mm" - 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.



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


16.  <sceneView>

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

   A <sceneView> element is characterized as follows.





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   <!-- SCENE VIEW TYPE -->
   <xs:complexType name="sceneViewType">
    <xs:sequence>
     <xs:element ref="description" minOccurs="0" maxOccurs="unbounded"/>
     <xs:element name="mediaCaptureIDs" type="captureIDListType"/>
    </xs:sequence>
    <xs:attribute name="sceneViewID" type="xs:ID" use="required"/>
   </xs:complexType>


   One or more optional <description> elements provide human-readable
   information about what the scene view contains. <description> is
   defined as already seen in Section 10.13.

   The remaining child elements are described in the following
   subsections.

16.1.  <mediaCaptureIDs>

   The <mediaCaptureIDs> is the list of the identifiers of the media
   captures included in the scene view.  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>


16.2.  sceneViewID attribute

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

17.  <encodingGroup>

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



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   captures.  The definition of the <encodingGroup> element is the
   following:



   <!-- ENCODING GROUP TYPE -->
   <xs:complexType name="encodingGroupType">
    <xs:sequence>
     <xs:element name="maxGroupBandwidth" type="xs:unsignedLong"/>
     <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.

17.1.  <maxGroupBandwidth>

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

17.2.  <encodingIDList>

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



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


17.3.  encodingGroupID attribute

   The encodingGroupID attribute contains the identifier of the encoding
   group.




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18.  <simultaneousSet>

   <simultaneousSet> represents a simultaneous transmission set, i.e., a
   list of captures of the same media type that can 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="mediaCaptureIDREF" type="xs:IDREF"
      minOccurs="0" maxOccurs="unbounded"/>
      <xs:element name="sceneViewIDREF" type="xs:IDREF"
      minOccurs="0" maxOccurs="unbounded"/>
      <xs:element name="captureSceneIDREF" type="xs:IDREF"
      minOccurs="0" maxOccurs="unbounded"/>
      <xs:any namespace="##other" processContents="lax" minOccurs="0"
      maxOccurs="unbounded"/>
    </xs:sequence>
    <xs:attribute name="setID" type="xs:ID" use="required"/>
    <xs:attribute name="mediaType" type="xs:string"/>
    <xs:anyAttribute namespace="##any" processContents="lax"/>
   </xs:complexType>


   Besides the identifiers of the captures (<mediaCaptureIDREF>
   elements), also the identifiers of capture scene views and of capture
   scene can be exploited, as shortcuts (<sceneViewIDREF> and
   <captureSceneIDREF> elements).

18.1.  setID attribute

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

   When only capture scene identifiers are listed within a simultaneous
   set, the media type attribute MUST be used in order to determine
   which media captures can be simultaneously sent together.

18.2.  mediaType attribute

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

   When only capture scene identifiers are listed within a simultaneous
   set, the media type attribute MUST appear in the XML description in



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   order to determine which media captures can be simultaneously sent
   together.

18.3.  <mediaCaptureIDREF>

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

18.4.  <sceneViewIDREF>

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

18.5.  <captureSceneIDREF>

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

19.  <globalView>

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



   <!-- GLOBAL VIEW TYPE -->
   <xs:complexType name="globalViewType">
    <xs:sequence>
      <xs:element name="sceneViewIDREF" type="xs:IDREF"
      minOccurs="0" maxOccurs="unbounded"/>
      <xs:any namespace="##other" processContents="lax" minOccurs="0"
      maxOccurs="unbounded"/>
    </xs:sequence>
    <xs:attribute name="globalViewID" type="xs:ID"/>
    <xs:anyAttribute namespace="##any" processContents="lax"/>
   </xs:complexType>


20.  <people>

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



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   element is provided.


<!-- PEOPLE TYPE -->
<xs:complexType name="peopleType">
<xs:sequence>
<xs:element name="person" type="personType"
                    maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>

        <!-- PERSON TYPE -->
        <xs:complexType name="personType">
          <xs:sequence>
             <xs:element name="personInfo" type="xcard:vcardType" maxOccurs="1"
                                 minOccurs="0"/>
             <xs:element name="personType" type="personTypeType"
                                 minOccurs="0"
                         maxOccurs="unbounded"/>
             <xs:any namespace="##other" processContents="lax" minOccurs="0"
                         maxOccurs="unbounded"/>
          </xs:sequence>
          <xs:attribute name="personID" type="xs:ID" use="required"/>
          <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>

<!-- PERSON TYPE TYPE -->
<xs:simpleType name="personTypeType">
        <xs:restriction base="xs:string">
        <xs:enumeration value="Chairman"/>
        <xs:enumeration value="Vice-Chairman"/>
        <xs:enumeration value="Minute taker"/>
        <xs:enumeration value="Presenter"/>
        <xs:enumeration value="Translator"/>
        <xs:enumeration value="Timekeeper"/>
        <xs:enumeration value="Attendee"/>
        <xs:enumeration value="Observer"/>
        </xs:restriction>
</xs:simpleType>



20.1.  <person>

   <person> includes all the metadata related to a person represented
   within one or more media captures.  Such element provides the vcard
   of the subject (via the <personInfo> element, see Section 20.1.2) and
   his conference role(s) (via one or more <personType> elements, see



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   Section 20.1.3).  Furthermore, it has a mandatory "personID"
   attribute (Section 20.1.1).

20.1.1.  personID attribute

   The "personID" attribute carries the identifier of a represented
   person.  Such identifier can be used to refer to the participant, as
   in the <capturedPeople> element in media captures representation
   (Section 10.21).

20.1.2.  <personInfo>

   The <personInfo> element is the XML representation of all the fields
   composing a vcard as specified in the Xcard RFC [RFC6351].  The
   vcardType is imported by the Xcard XML Schema provided by
   [I-D.ietf-ecrit-additional-data].  As such schema specifies, the <fn>
   element within <vcard> is mandatory.

20.1.3.  <personType>

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

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

21.  <captureEncoding>

   A <captureEncoding> is given from the association of a media capture
   and an individual encoding, to form a capture stream as defined in
   [I-D.ietf-clue-framework].  The model of such an entity is provided
   in the following.



<!-- CAPTURE ENCODING TYPE -->
<xs:complexType name="captureEncodingType">
 <xs:sequence>
  <xs:element name="captureID" type="xs:string"/>
  <xs:element name="encodingID" type="xs:string"/>
  <xs:element name="configuredContent" type="contentType" minOccurs="0"/>
  <xs:any namespace="##other" processContents="lax" minOccurs="0"
   maxOccurs="unbounded"/>
 </xs:sequence>
 <xs:attribute name="ID" type="xs:ID" use="required"/>



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


21.1.  <captureID>

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

21.2.  <encodingID>

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

21.3.  <configuredContent>

   <configuredContent> is an optional element to be used in case of
   configuration of MCCs.  It contains the list of capture identifiers
   and capture scene view identifiers the Media Consumer wants within
   the MCC.  That element is structured as the <content> element used to
   describe the content of a MCC, i.e., it contains The total number of
   the media captures listed in the <configuredContent> must be lower
   than or equal to the value carried within the <maxCaptures> attribute
   of the MCC.

22.  <clueInfo>

   The <clueInfo> element has been left within the XML Schema for
   representing a drafty version of the body of an 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="encodingGroups"/>
      <xs:element ref="captureScenes"/>
      <xs:element ref="simultaneousSets" minOccurs="0"/>
      <xs:element ref="globalViews" minOccurs="0"/>
      <xs:element ref="people" minOccurs="0"/>
      <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>


23.  XML Schema extensibility

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

23.1.  Example of extension

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

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







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   <?xml version="1.0" encoding="UTF-8" ?>
   <xs:schema
      targetNamespace="urn:ietf:params:xml:ns:clue-info-ext"
      xmlns:tns="urn:ietf:params:xml:ns:clue-info-ext"
      xmlns:clue-ext="urn:ietf:params:xml:ns:clue-info-ext"
      xmlns:xs="http://www.w3.org/2001/XMLSchema"
      xmlns="urn:ietf:params:xml:ns:clue-info-ext"
      xmlns:xcard="urn:ietf:params:xml:ns:vcard-4.0"
      xmlns:info="urn:ietf:params:xml:ns:clue-info"
      elementFormDefault="qualified"
      attributeFormDefault="unqualified">

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

   <!-- Import CLUE XML schema -->
   <xs:import namespace="urn:ietf:params:xml:ns:clue-info"
   schemaLocation="data-model-schema-07.xsd"/>

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

   </xs:schema>


























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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<clueInfo xmlns="urn:ietf:params:xml:ns:clue-info"
xmlns:ns2="urn:ietf:params:xml:ns:vcard-4.0"
xmlns:ns3="urn:ietf:params:xml:ns:clue-info-ext"
clueInfoID="NapoliRoom">
    <mediaCaptures>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="audioCaptureType"
        captureID="AC0"
        mediaType="audio">
            <captureSceneIDREF>CS1</captureSceneIDREF>
            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
            <individual>true</individual>
            <encGroupIDREF>EG1</encGroupIDREF>
            <ns3:newAudioFeature>newAudioFeatureValue</ns3:newAudioFeature>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="otherCaptureType"
        captureID="OMC0"
        mediaType="other media type">
            <captureSceneIDREF>CS1</captureSceneIDREF>
            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
            <encGroupIDREF>EG1</encGroupIDREF>
            <ns3:otherMediaCaptureTypeFeature>OtherValue
            </ns3:otherMediaCaptureTypeFeature>
        </mediaCapture>
    </mediaCaptures>
    <encodingGroups>
        <encodingGroup encodingGroupID="EG1">
            <maxGroupBandwidth>300000</maxGroupBandwidth>
            <encodingIDList>
                <encID>ENC4</encID>
                <encID>ENC5</encID>
            </encodingIDList>
        </encodingGroup>
    </encodingGroups>
    <captureScenes>
        <captureScene scale="unknown" sceneID="CS1"/>
    </captureScenes>
</clueInfo>


24.  Security considerations

   This document defines an XML Schema data model for telepresence
   scenarios.  The modeled information is identified in the CLUE
   framework as the needed one in order to enable a full-optional media
   stream negotiation and rendering.  Indeed, the XML elements herein



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   defined are used within CLUE protocol messages to describe both the
   media streams representing the MP's telepresence offer and the
   desired selection requested by the MC.  Security concerns described
   in [I-D.ietf-clue-framework], Section 15, apply to this document.

   Data model information carried within CLUE messages SHOULD be
   accessed only by authenticated endpoints.  Indeed, some information
   published by the MP might reveal sensitive data about who and what is
   represented in the transmitted streams.  The vCards included in the
   <personInfo> elements (Section 20.1) mandatorily contains the
   identity of the represented person.  Optionally vCards can also carry
   the person's contact addresses, together with his/her photo and other
   personal data.  Similar privacy-critical information can be conveyed
   by means of <sceneInformation> elements (Section 15.1) describing the
   capture scenes.  The <description> elements also can specify details
   that should be protected about the content of media captures
   (Section 10.13), capture scenes (Section 15), scene views
   (Section 16).

   Integrity attacks to the data model information incapsulated in CLUE
   messages can invalidate the success of the telepresence session's
   setup by misleading the MC's and MP's interpretation of the offered
   and desired media streams.

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

25.  IANA considerations

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

25.1.  XML namespace registration

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

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

   XML:









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BEGIN

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

END


25.2.  XML Schema registration

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

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

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

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

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

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

   To: ietf-types@iana.org

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

   MIME media type name: application

   MIME subtype name: clue_info+xml




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   Required parameters: (none)

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

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

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

   Interoperability considerations: None.

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

   Applications that use this media type: None.

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

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

   Intended usage: LIMITED USE

   Author/Change controller: The IETF

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

26.  Sample XML file

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

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



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   Besides the three video captures coming from such cameras, the MP
   makes available a further multi-content capture about the loudest
   segment of the room, obtained by switching the video source across
   the three cameras.  For the sake of simplicity, only one audio
   capture is advertised for the audio of the whole room.

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

   Media captures are arranged into four capture scene views:

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

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

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

   4.  (AC0) - main audio

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

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

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

   SS2  made by VC3, VC0, VC2, VC4




<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<clueInfo xmlns="urn:ietf:params:xml:ns:clue-info"
          xmlns:ns2="urn:ietf:params:xml:ns:vcard-4.0" clueInfoID="NapoliRoom">
    <mediaCaptures>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:type="audioCaptureType" captureID="AC0" mediaType="audio">
            <captureSceneIDREF>CS1</captureSceneIDREF>
            <encGroupIDREF>EG1</encGroupIDREF>
            <spatialInformation>
                <capturePoint>
                    <x>0.5</x>



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                    <y>1.0</y>
                    <z>0.5</z>
                    <lineOfCapturePoint>
                        <x>0.5</x>
                        <y>0.0</y>
                        <z>0.5</z>
                    </lineOfCapturePoint>
                </capturePoint>
            </spatialInformation>
            <individual>true</individual>
            <description lang="en">main audio from the room</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>room</view>
            <capturedPeople>
                <personIDREF>alice</personIDREF>
                <personIDREF>bob</personIDREF>
                <personIDREF>ciccio</personIDREF>
            </capturedPeople>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:type="videoCaptureType" captureID="VC0" mediaType="video">
            <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>
            </spatialInformation>
            <individual>true</individual>
            <description lang="en">left camera video capture</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>individual</view>
            <capturedPeople>
                <personIDREF>ciccio</personIDREF>
            </capturedPeople>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"



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        xsi:type="videoCaptureType" captureID="VC1" mediaType="video">
            <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>
            </spatialInformation>
            <individual>true</individual>
            <description lang="en">central camera video capture</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>individual</view>
            <capturedPeople>
                <personIDREF>alice</personIDREF>
            </capturedPeople>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="videoCaptureType" captureID="VC2" mediaType="video">
            <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>
            </spatialInformation>
            <individual>true</individual>
            <description lang="en">right camera video capture</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>individual</view>
            <capturedPeople>



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                <personIDREF>bob</personIDREF>
            </capturedPeople>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="videoCaptureType" captureID="VC3" mediaType="video">
            <captureSceneIDREF>CS1</captureSceneIDREF>
            <encGroupIDREF>EG0</encGroupIDREF>
            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
            <policy>Soundlevel:0</policy>
            <description lang="en">loudest room segment</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>individual</view>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="videoCaptureType" captureID="VC4" mediaType="video">
            <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>
            </spatialInformation>
            <individual>true</individual>
            <description lang="en">zoomed out view of all people in the
            room</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>room</view>
            <capturedPeople>
                <personIDREF>alice</personIDREF>
                <personIDREF>bob</personIDREF>
                <personIDREF>ciccio</personIDREF>
            </capturedPeople>
        </mediaCapture>
    </mediaCaptures>
    <encodingGroups>
        <encodingGroup encodingGroupID="EG0">
            <maxGroupBandwidth>600000</maxGroupBandwidth>



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            <encodingIDList>
                <encID>ENC1</encID>
                <encID>ENC2</encID>
                <encID>ENC3</encID>
            </encodingIDList>
        </encodingGroup>
        <encodingGroup encodingGroupID="EG1">
            <maxGroupBandwidth>300000</maxGroupBandwidth>
            <encodingIDList>
                <encID>ENC4</encID>
                <encID>ENC5</encID>
            </encodingIDList>
        </encodingGroup>
    </encodingGroups>
    <captureScenes>
        <captureScene scale="unknown" sceneID="CS1">
            <sceneViews>
                <sceneView sceneViewID="SE1">
                    <mediaCaptureIDs>
                        <captureIDREF>VC0</captureIDREF>
                        <captureIDREF>VC1</captureIDREF>
                        <captureIDREF>VC2</captureIDREF>
                    </mediaCaptureIDs>
                </sceneView>
                <sceneView sceneViewID="SE2">
                    <mediaCaptureIDs>
                        <captureIDREF>VC3</captureIDREF>
                    </mediaCaptureIDs>
                </sceneView>
                <sceneView sceneViewID="SE3">
                    <mediaCaptureIDs>
                        <captureIDREF>VC4</captureIDREF>
                    </mediaCaptureIDs>
                </sceneView>
                <sceneView sceneViewID="SE4">
                    <mediaCaptureIDs>
                        <captureIDREF>VC4</captureIDREF>
                    </mediaCaptureIDs>
                </sceneView>
            </sceneViews>
        </captureScene>
    </captureScenes>
    <simultaneousSets>
        <simultaneousSet setID="SS1">
            <mediaCaptureIDREF>VC3</mediaCaptureIDREF>
            <sceneViewIDREF>SE1</sceneViewIDREF>
        </simultaneousSet>
        <simultaneousSet setID="SS2">



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            <mediaCaptureIDREF>VC0</mediaCaptureIDREF>
            <mediaCaptureIDREF>VC2</mediaCaptureIDREF>
            <mediaCaptureIDREF>VC4</mediaCaptureIDREF>
            <mediaCaptureIDREF>VC3</mediaCaptureIDREF>
        </simultaneousSet>
    </simultaneousSets>
    <people>
        <person personID="bob">
            <personInfo>
                <ns2:fn>
                    <ns2:text>Bob</ns2:text>
                </ns2:fn>
            </personInfo>
            <personType>minute taker</personType>
        </person>
        <person personID="alice">
            <personInfo>
                <ns2:fn>
                    <ns2:text>Alice</ns2:text>
                </ns2:fn>
            </personInfo>
            <personType>presenter</personType>
        </person>
        <person personID="ciccio">
            <personInfo>
                <ns2:fn>
                    <ns2:text>Ciccio</ns2:text>
                </ns2:fn>
            </personInfo>
            <personType>chairman</personType>
            <personType>timekeeper</personType>
        </person>
    </people>
</clueInfo>



27.  MCC example

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




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   A possible description for that scenario could be the following:



<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<clueInfo xmlns="urn:ietf:params:xml:ns:clue-info"
xmlns:ns2="urn:ietf:params:xml:ns:vcard-4.0" clueInfoID="NapoliRoom">
    <mediaCaptures>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="audioCaptureType" captureID="AC0" mediaType="audio">
            <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>
            <individual>true</individual>
            <description lang="en">main audio from the room</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>room</view>
            <capturedPeople>
                <personIDREF>alice</personIDREF>
                <personIDREF>bob</personIDREF>
                <personIDREF>ciccio</personIDREF>
            </capturedPeople>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="videoCaptureType" captureID="VC0" mediaType="video">
            <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>



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                        <z>0.5</z>
                    </lineOfCapturePoint>
                </capturePoint>
            </spatialInformation>
            <individual>true</individual>
            <description lang="en">left camera video capture</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>individual</view>
            <capturedPeople>
                <personIDREF>ciccio</personIDREF>
            </capturedPeople>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="videoCaptureType" captureID="VC1" mediaType="video">
            <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>
            </spatialInformation>
            <individual>true</individual>
            <description lang="en">central camera video capture</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>individual</view>
            <capturedPeople>
                <personIDREF>alice</personIDREF>
            </capturedPeople>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="videoCaptureType" captureID="VC2" mediaType="video">
            <captureSceneIDREF>CS1</captureSceneIDREF>
            <encGroupIDREF>EG0</encGroupIDREF>
            <spatialInformation>
                <capturePoint>
                    <x>0.5</x>
                    <y>1.0</y>



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                    <z>0.5</z>
                    <lineOfCapturePoint>
                        <x>0.5</x>
                        <y>0.0</y>
                        <z>0.5</z>
                    </lineOfCapturePoint>
                </capturePoint>
            </spatialInformation>
            <individual>true</individual>
            <description lang="en">right camera video capture</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>individual</view>
            <capturedPeople>
                <personIDREF>bob</personIDREF>
            </capturedPeople>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="videoCaptureType" captureID="VC3" mediaType="video">
            <captureSceneIDREF>CS1</captureSceneIDREF>
            <encGroupIDREF>EG0</encGroupIDREF>
            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
            <content>
                <sceneViewIDREF>SE1</sceneViewIDREF>
            </content>
            <policy>Soundlevel:0</policy>
            <description lang="en">loudest room segment</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>individual</view>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="videoCaptureType" captureID="VC4" mediaType="video">
            <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>



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            </spatialInformation>
            <individual>true</individual>
            <description lang="en">zoomed out view of all people in the room</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>room</view>
            <capturedPeople>
                <personIDREF>alice</personIDREF>
                <personIDREF>bob</personIDREF>
                <personIDREF>ciccio</personIDREF>
            </capturedPeople>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="videoCaptureType" captureID="VC5" mediaType="video">
            <captureSceneIDREF>CS1</captureSceneIDREF>
            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
            <content>
                <sceneViewIDREF>SE1</sceneViewIDREF>
            </content>
            <policy>Soundlevel:1</policy>
            <description lang="en">penultimate loudest room segment</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>individual</view>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="videoCaptureType" captureID="VC6" mediaType="video">
            <captureSceneIDREF>CS1</captureSceneIDREF>
            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
            <content>
                <sceneViewIDREF>SE1</sceneViewIDREF>
            </content>
            <policy>Soundlevel:2</policy>
            <description lang="en">last but two loudest room segment</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>individual</view>
        </mediaCapture>
        <mediaCapture xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:type="videoCaptureType" captureID="VC7" mediaType="video">
            <captureSceneIDREF>CS1</captureSceneIDREF>
            <nonSpatiallyDefinable>true</nonSpatiallyDefinable>
            <content>
                <captureIDREF>VC3</captureIDREF>
                <captureIDREF>VC5</captureIDREF>



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                <captureIDREF>VC6</captureIDREF>
            </content>
            <description lang="en">big picture of the current speaker +
            pips about previous speakers</description>
            <priority>1</priority>
            <lang>it</lang>
            <mobility>static</mobility>
            <view>individual</view>
        </mediaCapture>
    </mediaCaptures>
    <encodingGroups>
        <encodingGroup encodingGroupID="EG0">
            <maxGroupBandwidth>600000</maxGroupBandwidth>
            <encodingIDList>
                <encID>ENC1</encID>
                <encID>ENC2</encID>
                <encID>ENC3</encID>
            </encodingIDList>
        </encodingGroup>
        <encodingGroup encodingGroupID="EG1">
            <maxGroupBandwidth>300000</maxGroupBandwidth>
            <encodingIDList>
                <encID>ENC4</encID>
                <encID>ENC5</encID>
            </encodingIDList>
        </encodingGroup>
    </encodingGroups>
    <captureScenes>
        <captureScene scale="unknown" sceneID="CS1">
            <sceneViews>
                <sceneView sceneViewID="SE1">
                    <description lang="en">participants' individual
                    videos</description>
                    <mediaCaptureIDs>
                        <captureIDREF>VC0</captureIDREF>
                        <captureIDREF>VC1</captureIDREF>
                        <captureIDREF>VC2</captureIDREF>
                    </mediaCaptureIDs>
                </sceneView>
                <sceneView sceneViewID="SE2">
                    <description lang="en">loudest segment of the
                    room</description>
                    <mediaCaptureIDs>
                        <captureIDREF>VC3</captureIDREF>
                    </mediaCaptureIDs>
                </sceneView>
                <sceneView sceneViewID="SE5">
                    <description lang="en">loudest segment of the



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                    room + pips</description>
                    <mediaCaptureIDs>
                        <captureIDREF>VC7</captureIDREF>
                    </mediaCaptureIDs>
                </sceneView>
                <sceneView sceneViewID="SE4">
                    <description lang="en">room audio</description>
                    <mediaCaptureIDs>
                        <captureIDREF>AC0</captureIDREF>
                    </mediaCaptureIDs>
                </sceneView>
                <sceneView sceneViewID="SE3">
                    <description lang="en">room video</description>
                    <mediaCaptureIDs>
                        <captureIDREF>VC4</captureIDREF>
                    </mediaCaptureIDs>
                </sceneView>
            </sceneViews>
        </captureScene>
    </captureScenes>
    <simultaneousSets>
        <simultaneousSet setID="SS1">
            <mediaCaptureIDREF>VC7</mediaCaptureIDREF>
            <sceneViewIDREF>SE1</sceneViewIDREF>
        </simultaneousSet>
        <simultaneousSet setID="SS2">
            <mediaCaptureIDREF>VC0</mediaCaptureIDREF>
            <mediaCaptureIDREF>VC2</mediaCaptureIDREF>
            <mediaCaptureIDREF>VC4</mediaCaptureIDREF>
            <mediaCaptureIDREF>VC7</mediaCaptureIDREF>
        </simultaneousSet>
    </simultaneousSets>
    <people>
        <person personID="bob">
            <personInfo>
                <ns2:fn>
                    <ns2:text>Bob</ns2:text>
                </ns2:fn>
            </personInfo>
            <personType>minute taker</personType>
        </person>
        <person personID="alice">
            <personInfo>
                <ns2:fn>
                    <ns2:text>Alice</ns2:text>
                </ns2:fn>
            </personInfo>
            <personType>presenter</personType>



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        </person>
        <person personID="ciccio">
            <personInfo>
                <ns2:fn>
                    <ns2:text>Ciccio</ns2:text>
                </ns2:fn>
            </personInfo>
            <personType>chairman</personType>
            <personType>timekeeper</personType>
        </person>
    </people>
</clueInfo>



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

   o  IANA Considerations: text added

   o  maxCaptureEncodings removed

   o  personTypeType values aligned with CLUE framework

   o  allowSubsetChoice added for multiple content captures

   o  embeddedText moved from videoCaptureType definition to
      mediaCaptureType definition

   o  typos removed from section Terminology

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

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

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

   o  Security section added.

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

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




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

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

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

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

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

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

   o  "millimeters" scale value changed in "mm"

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

      globalCaptureEntries/Entry renamed as globalSceneEntries/Entry;

      sceneInformation added;

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

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

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

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

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

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








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

      encodings section has been removed

      global capture entries have been introduced

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

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

      <encGroupIDREF> has been made optional.

      <single> has been renamed into <individual>

      Obsolete comments have been removed.

      participants information has been added.

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

      captureParameters and encodingParameters have been removed from
      the captureEncodingType

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

      A multiple content capture example has been added.

      Obsolete comments and references have been removed.

33.  Acknowledgments

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

34.  Informative References

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

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



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                                     Telepresence Multi-Streams",
                                     draft-ietf-clue-framework-21 (work
                                     in progress), March 2015.

   [I-D.ietf-clue-protocol]          Presta, R. and S. Romano, "CLUE
                                     protocol",
                                     draft-ietf-clue-protocol-03 (work
                                     in progress), February 2015.

   [I-D.ietf-ecrit-additional-data]  Randy, R., Rosen, B., Tschofenig,
                                     H., Marshall, R., and J.
                                     Winterbottom, "Additional Data
                                     Related to an Emergency Call",
                                     draft-ietf-ecrit-additional-data-29
                                     (work in progress), March 2015.

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

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

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

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

Authors' Addresses

   Roberta Presta
   University of Napoli
   Via Claudio 21
   Napoli  80125
   Italy

   EMail: roberta.presta@unina.it









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

   EMail: spromano@unina.it












































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