
<smil xmlns="http://www.w3.org/2001/SMIL20/Language">
    <head>
        <layout>
            <root-layout width="640" height="480" backgroundColor="white"/>
            <region id="d1" backgroundColor="blue" top="5px" left="5px" height="20px" width="20px" />
        </layout>
    </head>
    <body>
        <par dur="indefinite">
            <animateMotion to="5,400" begin="2s" speed="2" accelerate=".1" decelerate=".1" autoReverse="true" repeatCount="indefinite" dur="4s" targetElement="d1"  calcMode="paced" fill="hold"/>
        </par>
    </body>
</smil>