<course>
  <chapter url_name="Overview">
    <videosequence url_name="Toy_Videos">
      <html url_name="toylab"/>
      <video url_name="Video_Resources" youtube="1.0:1bK-WdDi6Qw"/>
    </videosequence>
    <video url_name="Welcome" youtube="1.0:p2Q6BrNhdh8"/>
  </chapter>
  <chapter url_name="Ch2">
     <html url_name="test_html">
         <h2>Welcome</h2>
     </html>
  </chapter>

</course>
