DPP — All parts must have the same ParallelBehaviour

All parts must have the same ParallelBehaviour even though the
implementation of the parts may be different.

// ParallelBehaviour (PB) as specified in IDL is just a sequence of
ParallelOperations; there is no field for a unique ID to be associated
with a PB. So, how does an ORB implementor (or application developer)
check to see that all parts implement the same PB? Parsing the whole PB
structure to check for equivalence seems unnecessarily expensive to me.