<?xml version="1.0" ?>
<sdf version="1.6">
  <world name="default">
    <gui>
      <plugin name="sample" filename="libgui_example_time_widget.so"/>
    </gui>
    <include>
      <uri>model://sun</uri>
    </include>
    <include>
      <uri>model://ground_plane</uri>
    </include>
  </world>
</sdf>
