    <!--
                Copyright: Copyright 1998-2001 W3C (MIT, INRIA, Keio), All Rights Reserved.
    See http://www.w3.org/Consortium/Legal/.
    Author: Aaron M. Cohen
             File Name: layout-subregion1.smil
      Media Components: 1 JPG
     Expected Behavior: Tests subregion positioning layout with topLayout element.
                        Show one topLayout.
                        At 0s show smile image with upper-left at upper-left corner for 2s.
                        At 2s show smile image with upper-left at upper-mid corner for 2s.
                        At 4s show smile image with upper-left at mid-left corner for 2s.
                        At 6s show smile image with upper-left at mid-mid corner for 2s.
    -->
    <smil xmlns="http://www.w3.org/2001/SMIL20/Language">
        <head>
            <layout>
               <topLayout width="640px" height="480px">
                   <region id="whole" top="0px" left="0px" width="640px" height="480px" />
                </topLayout>
            </layout>
        </head>
        <body>
            <seq>
                    <img id="img1" region="whole" src="../images/smile.jpg" top="0%" left="0%" dur="2s"/>
                    <img id="img2" region="whole" src="../images/smile.jpg" top="0%" left="50%" dur="2s"/>
                    <img id="img3" region="whole" src="../images/smile.jpg" top="50%" left="0%" dur="2s"/>
                    <img id="img4" region="whole" src="../images/smile.jpg" top="50%" left="50%" dur="2s"/>
            </seq>
        </body>
    </smil>