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
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on October 3, 2015.
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document authors. All rights reserved.
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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
Presta & Romano Expires October 3, 2015 [Page 60]
Internet-Draft draft-ietf-clue-data-model-schema-08 April 2015
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
Presta & Romano Expires October 3, 2015 [Page 62]
