handle

               The handle attribute allows a client application
               to assign a client-generated request identifier
               to an Insert action.  The handle is included to
               facilitate error reporting.  If an Update action
               in a Transaction request fails, then a WFS may
               include the handle in an exception report to localize
               the error.  If no handle is included of the offending
               Insert element then a WFS may employee other means of
               localizing the error (e.g. line number).