    <!--
                Copyright: Copyright 1998-2001 W3C (MIT, INRIA, Keio), All Rights Reserved.
    See http://www.w3.org/Consortium/Legal/.
    Author: Geoff Freed, WGBH/NCAM
               Version: Mar. 13, 2001, v3
                Module: Content Control Module
               Feature: systemAudioDesc test attribute
             File Name: systemAudioDesc.smil
      Media Components: 2 JPG, 2 WAV
     Expected Behavior: show image;
                        play audio descriptions from a single source file containing
                          descriptions and appropriately timed intervals of silence.
    -->
    <smil xmlns="http://www.w3.org/2001/SMIL20/Language">
         <body>
              <par>
                 <img src="../images/audiodesc.jpg"/>
                 <audio src="../sounds/audiodesc_off.wav" systemAudioDesc="off"/>
                 <audio src="../sounds/audiodesc_on.wav" systemAudioDesc="on"/>
              </par>
        </body>
    </smil>