    <smil xmlns="http://www.w3.org/2001/SMIL20/Language">
        <head>
            <layout>
                <root-layout width="640" height="480" backgroundColor="white"/>
                <region id="timedElement" backgroundColor="blue" top="10px" left="10px" height="100px" width="100px" z-index="1"/>
                <region id="timedElement2" backgroundColor="blue" top="60px" left="60px" height="100px" width="100px" z-index="1"/>
            </layout>
        </head>
        <body>
            <par dur="indefinite">
    		<animateColor attributeName="backgroundColor" to="red" begin="2s" dur="2s" autoReverse="true" targetElement="timedElement"  additive="replace" calcMode="linear" fill="freeze"/>
            </par>
        </body>
    </smil>