Methods and systems for a topology service providing {HEAD ~ an interface} for specifying {TAIL ~ a topology} and answering queries regarding the topology 
for specifying
Methods and systems for a topology service providing { HEAD ~ an interface } for specifying { TAIL ~ a topology } and answering queries regarding the topology
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH