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