    <!--
                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-default.smil
      Media Components: 2 JPG
     Expected Behavior: Implements default layout.
                        Show frown, show smile which hides frown.
                        Remove smil and frown reappears.
    -->
    <smil xmlns="http://www.w3.org/2001/SMIL20/Language">
        <head>
            <layout>
            </layout>
        </head>
        <body>
            <par>
                <img src="../images/frown.jpg" dur="4s"/>
                <img src="../images/smile.jpg" dur="2s" begin="1s"/>
            </par>
        </body>
    </smil>