kmx git

<?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>

kc3-lang/libxml2/test/SVG/switch.xml

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test/SVG/switch.xml