A single unified method call is made to policy {HEAD ~ adapters} in response to the mediated customer request, {TAIL ~ each} of the policy adapters in communication with a policy server 
A single unified method call is made to policy { HEAD ~ adapters } in response to the mediated customer request , { TAIL ~ each } of the policy adapters in communication with a policy server
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH