1 <layers>

     2     <visual src="Item">

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

     4             <duration>1.0</duration>

     5             <style>inquad</style>

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

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

     8         </param>

     9     </visual>

    10 </layers>