-- XSD schema extracted from ITU-T H.761 (11/2014)

<!--
XML Schema for the NCL modules

This is NCL
Copyright: 2005 PUC-RIO/LABORATORIO TELEMIDIA, All Rights Reserved.
See http://www.telemidia.puc-rio.br

Public URI: http://www.ncl.org.br/NCL3.1/modules/NCL31Descriptor.xsd
Author: TeleMidia Laboratory
Revision: 30/06/2013

Schema for the NCL Descriptor module namespace.
-->
<schema xmlns="http://www.w3.org/2001/XMLSchema"
  xmlns:descriptor="http://www.ncl.org.br/NCL3.1/Descriptor"
  targetNamespace="http://www.ncl.org.br/NCL3.1/Descriptor"
  elementFormDefault="qualified" attributeFormDefault="unqualified" >
  
  <complexType name="descriptorParamPrototype">
    <attribute name="name" type="string" use="required" />
    <attribute name="value" type="string" use="required"/>
  </complexType>

  <complexType name="descriptorPrototype">
    <sequence minOccurs="0" maxOccurs="unbounded">
      <element ref="descriptor:descriptorParam"/>
    </sequence>
    <attribute name="id" type="ID" use="required"/>
    <attribute name="player" type="string" use="optional"/>
  </complexType>

<!--
Formatters should support the following descriptorParam names. 
* For audio players: soundLevel; balanceLevel; trebleLevel; bassLevel.
* For text players: style, which refers to a style sheet with information for text presentation; textAlign; fontColor; FontFamily; fontStyle; fontSize; fontVariant; fontWeight.
* For visual media (any NCL media object, represented by a <media> element, whose content produces a visual presentation when the object is started) players : background, specifying the background color used to fill the area of a region displaying media; scroll, which allows the specification of how an author would like to configure the scroll in a region; fit, indicating how an object will be presented (hidden, fill, meet, meetBest, slice); transparency, indicating the degree of transparency of an object presentation (the value shall be between 0 and 1, or a real value in the range [0,100] ending with the character "%" (e.g. 30%)); visible, indicating if the presentation is to be seen or hidden; rgbChromakey; the object positioning parameters: top, left, bottom, right, width, height, zIndex, plan, plane, location, size and bounds; the focus movement parameters: moveLeft, moveRight, moveUp, moveDown, focusIndex; the other related focus parameters: focusBorderColor, selBorderColor, focusBorderWidth, focusBorderTransparency, focusSrc, and focusSelSrc; the transition parameters: transIn and transOut; the timing parameters: explicitDur and freeze; and the multiple device parameters: baseDeviceRegion and deviceClass.
* For players in general: player; reusePlayer, which determines if a new player shall be instantiated or if a player already instantiated shall be used; and playerLife, which specifies what will happen to the player instance at the end of the presentation.
-->

  <complexType name="descriptorBasePrototype">
    <attribute name="id" type="ID" use="optional"/>                      
  </complexType>

  <!-- declare global elements in this module -->
  <element name="descriptorParam" type="descriptor:descriptorParamPrototype"/>
  <element name="descriptor" type="descriptor:descriptorPrototype"/>
  <element name="descriptorBase" type="descriptor:descriptorBasePrototype"/>

  <!-- declare global attributes in this module -->
  <attributeGroup name="descriptorAttrs">
    <attribute name="descriptor" type="string" use="optional"/>
  </attributeGroup>
  </schema>