Further, {HEAD ~ the topology service} may communicate with {TAIL ~ any kind} of database or data store, where a given database or data store may be local or remotely accessible 
Further , { HEAD ~ the topology service } may communicate with { TAIL ~ any kind } of database or data store , where a given database or data store may be local or remotely accessible
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH