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libxml2

    1: <?xml version="1.0" standalone="yes"?>
    2: <svg xmlns="http://www.w3.org/Graphics/SVG/svg-19990412.dtd" width="4in" height="3in">
    3:   <desc>This example uses the switch element to provide a 
    4:   fallback graphical representation of an equation, if 
    5:   MathML is not supported.
    6:   </desc>
    7: <!-- The <switch> element will process the first child element
    8:        whose testing attributes evaluate to true.-->
    9:   <switch>
   10: <!-- Process the MathML if the system-required attribute
   11:          evaluates to true (i.e., the user agent supports MathML
   12:          embedded within SVG). -->
   13:     <foreignobject system-required="http://www.w3.org/TR/REC-MathML-19980407" width="100" height="50">
   14: <!-- MathML content goes here -->
   15:     </foreignobject>
   16: <!-- Else, process the following alternate SVG.
   17:          Note that there are no testing attributes on the <g> element.
   18:          If no testing attributes are provided, it is as if there
   19:          were testing attributes and they evaluated to true.-->
   20:     <g>
   21: <!-- Draw a red rectangle with a text string on top. -->
   22:       <rect style="fill: red"/>
   23:       <text>Formula goes here</text>
   24:     </g>
   25:   </switch>
   26: </svg>