1 <?xml version="1.0" standalone="yes"?>
4 <!-- The SMIL <switch> element will process the
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5 first child element which tests true and skip
\r
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. -->
11 <ref system-required="http://www.w3.org/Graphics/SVG/svg-19990412.dtd" type="image/svg" src="drawing.svg"/>
12 <!-- Else, render the alternate image. -->
13 <img src="alternate_image.jpg"/>