<smil>
 <head>
  <layout>
    <region id="c1" top="0" left="0" height="600" width="600"/>
  </layout>
 </head>
  <body>
    <par>
    <a href="http://smil.nist.gov/interop1/choose.jpg">
      <text src="http://smil.nist.gov/interop1/test.html" region="c1"/>
    </a>
    </par>
  </body>
</smil>