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">
             <img src="../images/audiodesc.jpg"/>
             <audio src="../sounds/audiodesc_off.wav" systemAudioDesc="off"/>
             <audio src="../sounds/audiodesc_on.wav" systemAudioDesc="on"/>