| 1 | <?xml version="1.0" standalone="yes"?>
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| 2 | <smil>
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| 3 | <body>
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| 4 | <!-- The SMIL <switch> element will process the
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| 5 | first child element which tests true and skip
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| 6 | past all others. -->
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| 7 | <switch>
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| 8 | <!-- The system-required attribute tests to see if
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| 9 | the user agent supports SVG. If true, then
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| 10 | render the file drawing.svg. -->
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| 11 | <ref system-required="http://www.w3.org/Graphics/SVG/svg-19990412.dtd" type="image/svg" src="drawing.svg"/>
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| 12 | <!-- Else, render the alternate image. -->
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| 13 | <img src="alternate_image.jpg"/>
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| 14 | </switch>
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| 15 | </body>
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| 16 | </smil>
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