1 <layers>

     2 	<visual>

     3 		<param name="opacity" type="anim">

     4 			<duration>0.7</duration>

     5 			<style>linear</style>

     6 			<keyframe at="0.0">0.0</keyframe>

     7 			<keyframe at="0.7">1.0</keyframe>

     8 		</param>

     9 	</visual>

    10 </layers>