# File lib/tapkit/control/qualifier.rb, line 307
                        def operator_symbol( string )
                                case string.upcase
                                when '='      then EQUAL
                                when '=='     then EQUAL
                                when '!='     then NOT_EQUAL
                                when '>'      then GREATER
                                when '>='     then GREATER_OR_EQUAL
                                when '<'      then LESS
                                when '<='     then LESS_OR_EQUAL
                                when 'CILIKE' then CI_LIKE
                                when 'LIKE'   then LIKE
                                end
                        end