libxml2/test/SVG/switch.xml


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<?xml version="1.0" standalone="yes"?>
<smil>
  <body>
    <!-- The SMIL <switch> element will process the

         first child element which tests true and skip

         past all others. -->
    <switch>

      <!-- The system-required attribute tests to see if

           the user agent supports SVG. If true, then

           render the file drawing.svg. -->
      <ref system-required="http://www.w3.org/Graphics/SVG/svg-19990412.dtd" 
           type="image/svg" src="drawing.svg" />

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