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RFC 6505

 
 
 

A Mixer Control Package for the Media Control Channel Framework

Part 4 of 5, p. 56 to 74
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5.  Formal Syntax

   This section defines the XML schema for the Mixer Control Package.
   The schema is normative.

   The schema defines datatypes, attributes, and mixer elements in the
   urn:ietf:params:xml:ns:msc-mixer namespace.  In most elements, the
   order of child elements is significant.  The schema is extensible:
   elements allow attributes and child elements from other namespaces.

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   Elements from outside this package's namespace can occur after
   elements defined in this package.

   The schema is dependent upon the schema (framework.xsd) defined in
   Appendix A.1 of the Control Framework [RFC6230].

   <?xml version="1.0" encoding="UTF-8"?>
   <xsd:schema targetNamespace="urn:ietf:params:xml:ns:msc-mixer"
    xmlns:fw="urn:ietf:params:xml:ns:control:framework-attributes"
    elementFormDefault="qualified"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns="urn:ietf:params:xml:ns:msc-mixer"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema">

    <xsd:annotation>
     <xsd:documentation>
      IETF MediaCtrl Mixer 1.0 (20110104)

      This is the schema of the Mixer Control Package.  It
      defines request, response, and notification elements for
      mixing.

      The schema namespace is urn:ietf:params:xml:ns:msc-mixer

     </xsd:documentation>
    </xsd:annotation>

    <!--
     #############################################################

     SCHEMA IMPORTS

     #############################################################
    -->


    <xsd:import
     namespace="urn:ietf:params:xml:ns:control:framework-attributes"
     schemaLocation="framework.xsd">
     <xsd:annotation>
      <xsd:documentation>
       This import brings in the framework attributes for
       conferenceid and connectionid.
      </xsd:documentation>
     </xsd:annotation>
    </xsd:import>

    <!--

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     #####################################################

     Extensible core type

     #####################################################
    -->


    <xsd:complexType name="Tcore">
     <xsd:annotation>
      <xsd:documentation>
       This type is extended by other (non-mixed) component types to
       allow attributes from other namespaces.
      </xsd:documentation>
     </xsd:annotation>
     <xsd:sequence/>
     <xsd:anyAttribute namespace="##other" processContents="lax" />
    </xsd:complexType>

    <!--
     #####################################################

     TOP-LEVEL ELEMENT: mscmixer

     #####################################################
    -->

    <xsd:complexType name="mscmixerType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:choice>
         <xsd:element ref="createconference" />
         <xsd:element ref="modifyconference" />
         <xsd:element ref="destroyconference" />
         <xsd:element ref="join" />
         <xsd:element ref="unjoin" />
         <xsd:element ref="modifyjoin" />
         <xsd:element ref="response" />
         <xsd:element ref="event" />
         <xsd:element ref="audit" />
         <xsd:element ref="auditresponse" />
         <xsd:any namespace="##other" minOccurs="0"
          maxOccurs="unbounded" processContents="lax" />
        </xsd:choice>
       </xsd:sequence>
       <xsd:attribute name="version" type="version.datatype"
        use="required" />

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       <xsd:attribute name="desclang" type="xsd:language"
        default="i-default" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="mscmixer" type="mscmixerType" />

    <!--
     #####################################################

     CONFERENCE MANAGEMENT TYPES

     #####################################################
    -->

    <!--  createconference -->

    <xsd:complexType name="createconferenceType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="codecs" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="audio-mixing" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="video-layouts" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="video-switch" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="subscribe" minOccurs="0"
         maxOccurs="1" />
        <xsd:any namespace="##other"
         processContents="lax" minOccurs="0" maxOccurs="unbounded" />
       </xsd:sequence>
       <xsd:attribute name="conferenceid" type="xsd:string" />
       <xsd:attribute name="reserved-talkers"
        type="xsd:nonNegativeInteger" default="0" />
       <xsd:attribute name="reserved-listeners"
        type="xsd:nonNegativeInteger" default="0" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>


    <xsd:element name="createconference" type="createconferenceType" />

    <!--  modifyconference -->

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    <xsd:complexType name="modifyconferenceType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="codecs" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="audio-mixing" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="video-layouts" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="video-switch" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="subscribe" />
        <xsd:any namespace="##other"
         processContents="lax" minOccurs="0" maxOccurs="unbounded" />
       </xsd:sequence>
       <xsd:attribute name="conferenceid" type="xsd:string"
        use="required" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="modifyconference" type="modifyconferenceType" />


    <!--  destroyconference -->

    <xsd:complexType name="destroyconferenceType">
    <xsd:complexContent>
      <xsd:extension base="Tcore">
      <xsd:sequence>
       <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
      <xsd:attribute name="conferenceid" type="xsd:string"
      use="required" />
      </xsd:extension>
      </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="destroyconference"
     type="destroyconferenceType" />

    <!--
     #####################################################

     JOIN TYPES

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     #####################################################
    -->

    <xsd:complexType name="joinType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="stream" minOccurs="0"
         maxOccurs="unbounded" />
        <xsd:any namespace="##other"
         processContents="lax" minOccurs="0" maxOccurs="unbounded" />
       </xsd:sequence>
       <xsd:attribute name="id1" type="xsd:string"
        use="required" />
       <xsd:attribute name="id2" type="xsd:string"
        use="required" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="join" type="joinType" />

    <xsd:complexType name="modifyjoinType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="stream" minOccurs="0"
         maxOccurs="unbounded" />
        <xsd:any namespace="##other"
         processContents="lax" minOccurs="0" maxOccurs="unbounded" />
       </xsd:sequence>
       <xsd:attribute name="id1" type="xsd:string"
        use="required" />
       <xsd:attribute name="id2" type="xsd:string"
        use="required" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="modifyjoin" type="modifyjoinType" />


    <xsd:complexType name="unjoinType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="stream" minOccurs="0"
         maxOccurs="unbounded" />

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        <xsd:any namespace="##other"
         processContents="lax" minOccurs="0" maxOccurs="unbounded" />
       </xsd:sequence>
       <xsd:attribute name="id1" type="xsd:string"
        use="required" />
       <xsd:attribute name="id2" type="xsd:string"
        use="required" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="unjoin" type="unjoinType" />

    <!--
     #####################################################

     OTHER TYPES

     #####################################################
    -->

    <xsd:complexType name="eventType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:choice>
         <xsd:element ref="active-talkers-notify"
          minOccurs="0" maxOccurs="1" />
         <xsd:element ref="unjoin-notify"
          minOccurs="0" maxOccurs="1" />
         <xsd:element ref="conferenceexit"
          minOccurs="0" maxOccurs="1" />
         <xsd:any namespace="##other" minOccurs="0"
          maxOccurs="unbounded" processContents="lax" />
        </xsd:choice>
       </xsd:sequence>
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="event" type="eventType" />

    <xsd:complexType name="activetalkersnotifyType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="active-talker" minOccurs="0"
         maxOccurs="unbounded" />

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        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
       <xsd:attribute name="conferenceid" type="xsd:string"
        use="required" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="active-talkers-notify"
     type="activetalkersnotifyType" />


    <xsd:complexType name="activetalkerType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
       <xsd:attributeGroup ref="fw:framework-attributes" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="active-talker" type="activetalkerType" />


    <xsd:complexType name="unjoinnotifyType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
       <xsd:attribute name="status" type="xsd:nonNegativeInteger"
         use="required" />
       <xsd:attribute name="reason" type="xsd:string" />
         <xsd:attribute name="desclang" type="xsd:language"/>
       <xsd:attribute name="id1" type="xsd:string"
        use="required" />
       <xsd:attribute name="id2" type="xsd:string"
        use="required" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="unjoin-notify" type="unjoinnotifyType" />

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    <!--  conferenceexit-->

    <xsd:complexType name="conferenceexitType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
       <xsd:attribute name="conferenceid" type="xsd:string"
        use="required" />
       <xsd:attribute name="status"
        type="xsd:nonNegativeInteger" use="required" />
       <xsd:attribute name="reason" type="xsd:string" />
         <xsd:attribute name="desclang" type="xsd:language"/>
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="conferenceexit" type="conferenceexitType" />


    <xsd:complexType name="responseType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
      <xsd:sequence>
       <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
       <xsd:attribute name="status" type="status.datatype"
        use="required" />
       <xsd:attribute name="reason" type="xsd:string" />
         <xsd:attribute name="desclang" type="xsd:language"/>
       <xsd:attributeGroup ref="fw:framework-attributes" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>


    <xsd:element name="response" type="responseType" />

    <xsd:complexType name="subscribeType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="active-talkers-sub"
         minOccurs="0" maxOccurs="1" />
        <xsd:any namespace="##other" minOccurs="0"

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         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>


    <xsd:element name="subscribe" type="subscribeType" />

    <xsd:complexType name="activetalkerssubType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
       <xsd:attribute name="interval"
        type="xsd:nonNegativeInteger" default="3" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="active-talkers-sub"
     type="activetalkerssubType" />


    <xsd:complexType name="streamType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="volume" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="clamp" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="region" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="priority" minOccurs="0"
         maxOccurs="1" />
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
       <xsd:attribute name="media" type="media.datatype"
        use="required" />
       <xsd:attribute name="label" type="label.datatype" />
       <xsd:attribute name="direction"
        type="direction.datatype" default="sendrecv" />
      </xsd:extension>
     </xsd:complexContent>

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    </xsd:complexType>

    <xsd:element name="stream" type="streamType" />


    <xsd:complexType name="volumeType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
       <xsd:attribute name="controltype"
        type="volumecontroltype.datatype" use="required" />
       <xsd:attribute name="value" type="xsd:string" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="volume" type="volumeType" />


    <xsd:complexType name="clampType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
       <xsd:attribute name="tones" type="xsd:string"
        default="1 2 3 4 5 6 7 8 9 0 * # A B C D"/>
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="clamp" type="clampType" />


    <!--  region  -->
    <xsd:simpleType name="regionType">
     <xsd:restriction base="xsd:NMTOKEN" />
    </xsd:simpleType>

    <xsd:element name="region" type="regionType" />


    <!--  priority  -->
    <xsd:simpleType name="priorityType">

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     <xsd:restriction base="xsd:positiveInteger" />
    </xsd:simpleType>

    <xsd:element name="priority" type="priorityType" />

    <xsd:complexType name="audiomixingType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
      <xsd:sequence>
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
       <xsd:attribute name="type" type="audiomix.datatype"
        default="nbest" />
       <xsd:attribute name="n" type="xsd:nonNegativeInteger"
        default="0" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="audio-mixing" type="audiomixingType" />

    <!-- video-switch -->

    <xsd:complexType name="videoswitchType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
         <xsd:choice>
          <xsd:element name="vas" type="Tcore"/>
          <xsd:element name="controller" type="Tcore"/>
          <xsd:any namespace="##other" processContents="lax" />
        </xsd:choice>
       </xsd:sequence>
       <xsd:attribute name="interval"
        type="xsd:nonNegativeInteger" default="3" />
       <xsd:attribute name="activespeakermix"
        type="xsd:boolean" default="false" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="video-switch" type="videoswitchType" />

    <!-- video-layouts -->

    <xsd:complexType name="videolayoutsType">
     <xsd:complexContent>

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      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="video-layout" minOccurs="0"
         maxOccurs="unbounded" />
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="video-layouts" type="videolayoutsType" />


    <!-- video-layout -->
    <xsd:complexType name="videolayoutType">
    <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:choice>
          <xsd:element name="single-view" type="Tcore"/>
          <xsd:element name="dual-view" type="Tcore"/>
          <xsd:element name="dual-view-crop" type="Tcore"/>
          <xsd:element name="dual-view-2x1" type="Tcore"/>
          <xsd:element name="dual-view-2x1-crop" type="Tcore"/>
          <xsd:element name="quad-view" type="Tcore"/>
          <xsd:element name="multiple-3x3" type="Tcore"/>
          <xsd:element name="multiple-4x4" type="Tcore"/>
          <xsd:element name="multiple-5x1" type="Tcore"/>
          <xsd:any namespace="##other" processContents="lax" />
        </xsd:choice>
       </xsd:sequence>
      <xsd:attribute name="min-participants"
        type="xsd:positiveInteger" default="1" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="video-layout" type="videolayoutType" />

    <xsd:complexType name="auditType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
      <xsd:sequence>
      <xsd:any namespace="##other" minOccurs="0"
       maxOccurs="unbounded" processContents="lax" />
      </xsd:sequence>
       <xsd:attribute name="capabilities"

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        type="xsd:boolean" default="true" />
       <xsd:attribute name="mixers" type="xsd:boolean"
        default="true" />
       <xsd:attribute name="conferenceid" type="xsd:string" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="audit" type="auditType" />


    <xsd:complexType name="auditresponseType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="capabilities" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="mixers" minOccurs="0"
         maxOccurs="1" />
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
       <xsd:attribute name="status" type="status.datatype"
        use="required" />
       <xsd:attribute name="reason" type="xsd:string" />
         <xsd:attribute name="desclang" type="xsd:language"/>
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="auditresponse" type="auditresponseType" />

    <!-- mixers -->

    <xsd:complexType name="mixersType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="conferenceaudit" minOccurs="0"
         maxOccurs="unbounded" />
        <xsd:element ref="joinaudit" minOccurs="0"
         maxOccurs="unbounded" />
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

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    <xsd:element name="mixers" type="mixersType" />

    <!--  joinaudit -->

    <xsd:complexType name="joinauditType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:any namespace="##other"
         processContents="lax" minOccurs="0" maxOccurs="unbounded" />
       </xsd:sequence>
       <xsd:attribute name="id1" type="xsd:string"
        use="required" />
       <xsd:attribute name="id2" type="xsd:string"
        use="required" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="joinaudit" type="joinauditType" />

    <!-- conferenceaudit -->

    <xsd:complexType name="conferenceauditType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="codecs" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="participants" minOccurs="0"
         maxOccurs="1" />
        <xsd:element ref="video-layout" minOccurs="0"
         maxOccurs="1" />
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
       <xsd:attribute name="conferenceid" type="xsd:string"
        use="required" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="conferenceaudit" type="conferenceauditType" />


    <!-- participants -->

    <xsd:complexType name="participantsType">

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     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="participant" minOccurs="0"
         maxOccurs="unbounded" />
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="participants" type="participantsType" />

    <!-- participant -->

    <xsd:complexType name="participantType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
       <xsd:attribute name="id" type="xsd:string"
        use="required" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="participant" type="participantType" />

    <!-- capabilities -->

    <xsd:complexType name="capabilitiesType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="codecs" minOccurs="1"
         maxOccurs="1" />
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="capabilities" type="capabilitiesType" />

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    <!-- codecs -->

    <xsd:complexType name="codecsType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="codec" minOccurs="0"
         maxOccurs="unbounded" />
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="codecs" type="codecsType" />

    <!-- codec -->

    <xsd:complexType name="codecType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="subtype" minOccurs="1"
         maxOccurs="1" />
        <xsd:element ref="params" minOccurs="0"
         maxOccurs="1" />
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
        <xsd:attribute name="name" type="xsd:string"
        use="required" />
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="codec" type="codecType" />

    <!-- subtype -->

    <xsd:simpleType name="subtypeType">
     <xsd:restriction base="xsd:string" />
    </xsd:simpleType>

    <xsd:element name="subtype" type="subtypeType" />


    <!-- params -->

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    <xsd:complexType name="paramsType">
     <xsd:complexContent>
      <xsd:extension base="Tcore">
       <xsd:sequence>
        <xsd:element ref="param" minOccurs="0"
         maxOccurs="unbounded" />
        <xsd:any namespace="##other" minOccurs="0"
         maxOccurs="unbounded" processContents="lax" />
       </xsd:sequence>
      </xsd:extension>
     </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="params" type="paramsType" />


    <!--  param -->
       <!--  doesn't extend tCore since its content model is mixed -->
    <xsd:complexType name="paramType" mixed="true">
     <xsd:sequence/>
     <xsd:attribute name="name" type="xsd:string" use="required" />
     <xsd:attribute name="type" type="mime.datatype"
     default="text/plain" />
        <xsd:attribute name="encoding" type="xsd:string"/>
    </xsd:complexType>

    <xsd:element name="param" type="paramType" />


    <!--
     ####################################################

     DATATYPES

     ####################################################
    -->

   <xsd:simpleType name="version.datatype">
     <xsd:restriction base="xsd:NMTOKEN">
      <xsd:enumeration value="1.0" />
     </xsd:restriction>
    </xsd:simpleType>

    <xsd:simpleType name="eventname.datatype">
     <xsd:restriction base="xsd:NMTOKEN">
      <xsd:pattern value="[a-zA-Z0-9\.]+" />
     </xsd:restriction>
    </xsd:simpleType>

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    <xsd:simpleType name="audiomix.datatype">
     <xsd:restriction base="xsd:NMTOKEN">
      <xsd:enumeration value="nbest" />
      <xsd:enumeration value="controller" />
     </xsd:restriction>
    </xsd:simpleType>

    <xsd:simpleType name="media.datatype">
     <xsd:restriction base="xsd:string" />
    </xsd:simpleType>

    <xsd:simpleType name="label.datatype">
     <xsd:restriction base="xsd:string" />
    </xsd:simpleType>

    <xsd:simpleType name="status.datatype">
     <xsd:restriction base="xsd:positiveInteger">
      <xsd:pattern value="[0-9][0-9][0-9]" />
     </xsd:restriction>
    </xsd:simpleType>

    <xsd:simpleType name="direction.datatype">
     <xsd:restriction base="xsd:NMTOKEN">
      <xsd:enumeration value="sendonly" />
      <xsd:enumeration value="recvonly" />
      <xsd:enumeration value="sendrecv" />
      <xsd:enumeration value="inactive" />
     </xsd:restriction>
    </xsd:simpleType>


    <xsd:simpleType name="mime.datatype">
     <xsd:restriction base="xsd:string" />
    </xsd:simpleType>


    <xsd:simpleType name="volumecontroltype.datatype">
     <xsd:restriction base="xsd:NMTOKEN">
      <xsd:enumeration value="automatic" />
      <xsd:enumeration value="setgain" />
      <xsd:enumeration value="setstate" />
     </xsd:restriction>
    </xsd:simpleType>


   </xsd:schema>

                    Figure 10: Mixer Package XML Schema


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