{HEAD ~ The present system} applies {TAIL ~ the transformed inexact query output} to the heterogeneous datastore and applies the local query element to a query result returned from the heterogeneous datastore to provide a query result 
applies
{ HEAD ~ The present system } applies { TAIL ~ the transformed inexact query output } to the heterogeneous datastore and applies the local query element to a query result returned from the heterogeneous datastore to provide a query result
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH