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