The topology service may also provide an interface for receiving {HEAD ~ metadata} regarding {TAIL ~ the topology} 
regarding
The topology service may also provide an interface for receiving { HEAD ~ metadata } regarding { TAIL ~ the topology }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL