1 <layers>

     2 	<visual>

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

     4 	        <duration>0.5</duration>

     5 		    <keyframe at="0.0">90</keyframe>	

     6 	            <keyframe at="1.0">180</keyframe>

     7 	     </param>

     8    	    

     9 	    <param name="rotation_origin_x" ref="visual.width">0.5</param>

    10 	    <param name="rotation_origin_y" ref="visual.height">0.5</param>

    11 	    <param name="rotation_axis_z">1</param>

    12     	    

    13 	</visual>

    14 </layers>