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