# leadOpt1
# from http://www.w3.org/2008/07/MappingRules/#leadOpt1 Revision: 1.38 
# $Id: query_spec-leadOpt1.rq,v 1.1 2008/09/08 13:12:41 eric Exp $

PREFIX emplP: <http://hr.example/DB/Employee#>

SELECT ?empName ?grandManagName
 WHERE { OPTIONAL { ?manager      emplP:manager    ?emp .
                    ?manager      emplP:manager    ?grandManager .
                    ?grandManager emplP:lastName   ?grandManagName } 
                  ?emp            emplP:lastName   ?empName }