1 <layers>
2 <visual>
3 <param name="opacity" type="anim">
4 <duration>1.0</duration>
5 <style>linear</style>
6 <keyframe at="0.0">0.0</keyframe>
7 <keyframe at="1.0">1.0</keyframe>
8 </param>
9 </visual>
10 </layers>