<element name="world" required="*">
  <description>The world element encapsulates an entire world description including: models, scene, physics, joints, and plugins</description>

  <attribute name="name" type="string" default="__default__" required="1">
    <description>Unique name of the world</description>
  </attribute>

  <element name="audio" required="0">
    <description>Global audio properties.</description>

    <element name="device" type="string" default="default" required="1">
      <description>Device to use for audio playback. A value of "default" will use the system's default audio device. Otherwise, specify a an audio device file"</description>
    </element>
  </element>

  <element name="include" required="*">
    <description>Include resources from a URI</description>
    <element name="uri" type="string" default="__default__" required="1">
      <description>URI to a resource, such as a model</description>
    </element>
  </element>


  <include filename="gui.sdf" required="0"/>
  <include filename="physics.sdf" required="1"/>
  <include filename="scene.sdf" required="1"/>
  <include filename="light.sdf" required="*"/>

  <include filename="model.sdf" required="*"/>
  <include filename="actor.sdf" required="*"/>
  <include filename="plugin.sdf" required="*"/>
  <include filename="joint.sdf" required="*"/>
  <include filename="road.sdf" required="*"/>
  <include filename="spherical_coordinates.sdf" required="0"/>

  <include filename="state.sdf" required="*"/>
</element> <!-- End World -->
