ValueTypeCompleter doesn't support List, the current behaviour s not the expected one. Fo example:
1) When an empty list of complex types in completed, all properties of the complex types are candidates for an empty list. For example:
content=[ <TAB> ==> gives you the list of the fields contained in the complex type the only 2 candidates should be: '{' and ']'
2) No more completion when a second instance is typed content=[

,{>TAB> ==> has 0 candidates.
The new "exploded deployment" add-content operation requires the completion of List of complex type to work.