<element name="gazebo" required="1">
  <attribute name="version" type="string" default="1.0" required="1"/>

  <include filename="world.sdf" required="*"/>
  <include filename="model.sdf" required="*"/>
  <include filename="actor.sdf" required="*"/>
  <include filename="light.sdf" required="*"/>

</element> <!-- End Gazebo -->
