ordering attribute does not work?
<p>Diging into Property Animation, introduced in Android Honeycomb, I found an example of an Animator Set. In Dev Guide, it is written that "The set element (AnimatorSet) exposes a single attribute, ordering. Set this attribute to together (default) to play all the animations in this set at once. Set this attribute to sequentially to play the animations in the order they are declared". So, I tryed this attribute 
<code>&lt;set android:ordering="sequentially"&gt;&lt;/set&gt;</code>, but I got an error, saying <code>"error: Error parsing XML: unbound prefix</code>". Why is it so? Does the <code>&lt;set&gt;</code> part must be inside sth else? </p>
