<?xml version="1.0" standalone="yes"?>
<smil>
<body>
  <!-- With SMIL 1.0, the first child element of 'switch'
       which the SMIL 1.0 user agent is able to process 
       and which tests true will get processed and all other 
       child elements will have no visual effect. In this case, 
       if the SMIL 1.0 user agent can process "image/svg", 
       then the SVG will appear; otherwise, the alternate image 
       (the second child element) will appear. -->
  <switch>
    <!-- Render the SVG if possible. -->
    <ref type="image/svg" src="drawing.svg" />

    <!-- Else, render the alternate image. -->
    <img src="alternate_image.jpg" />
  </switch>
</body>
</smil>
