Otherwise, the present system applies additional candidate transformation rules to {HEAD ~ the selected query element} to generate {TAIL ~ the transformed inexact query output} for querying the heterogeneous datastore 
to generate
Otherwise , the present system applies additional candidate transformation rules to { HEAD ~ the selected query element } to generate { TAIL ~ the transformed inexact query output } for querying the heterogeneous datastore
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH