# filter1
# from http://www.w3.org/2008/07/MappingRules/#filter1 Revision: 1.38 
# $Id: query_spec-filter1.rq,v 1.1 2008/09/08 13:12:41 eric Exp $

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

SELECT ?empName ?grandManagName
 WHERE { ?emp          emplP:lastName   ?empName .
         ?emp          emplP:birthday   ?empBday .
         ?lower        managP:manages   ?emp .
         ?lower        managP:manager   ?manager .
         ?manager      emplP:birthday   ?manBday .
         ?upper        managP:manages   ?manager .
         ?upper        managP:manager   ?grandManager .
         ?grandManager emplP:birthday   ?grandManBday .
         ?grandManager emplP:lastName   ?grandManagName
         FILTER (?manBday < ?empBday && ?grandManBday < ?manBday) }