No code completion in XML code within fully qualified tag

Question

Why does code within a fully qualified tag lack auto-completion in Eclipse?

For example, within the following code (where the comment is) nothing I type is provided auto completion for member names / tag names.

<android.gesture.GestureOverlayView 
  android:id="@+id/gesturePage01"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:layout_weight="1.0">

  <!-- All code entered here lacks code completion -->

</android.gesture.GestureOverlayView>

Autocompletion works fine on my other code which is not embedded within a tag which is fully qualified...