{HEAD ~ The policy adapters} transform the single unified method call into formats acceptable by each associated policy servers and place {TAIL ~ the transformed requests} to the associated servers 
{ HEAD ~ The policy adapters } transform the single unified method call into formats acceptable by each associated policy servers and place { TAIL ~ the transformed requests } to the associated servers
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH