More specifically, {HEAD ~ this invention} relates to {TAIL ~ a query transformation technique} to achieve more efficient query processing of systems with varying query capabilities within a federated system 
relates to
More specifically , { HEAD ~ this invention } relates to { TAIL ~ a query transformation technique } to achieve more efficient query processing of systems with varying query capabilities within a federated system
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH