<smil>
  <head>
	<layout>
		<root-layout height="75" width="250" background-color="blue"/>
		<region id="r1" top="0" left="0" height="75" width="250"/>
	</layout>
  </head>
  <body>
         <par>
           <img src="http://smil.nist.gov/interop1/choose.jpg"
               dur="1s" region="r1"/>
           <audio src="http://smil.nist.gov/interop1/correct.wav"
                  clip-begin="smpte=00:00:01" />
         </par>
  </body>
</smil>