Generating SPARQL: SPIN RDF

query.ttl

@prefix :     <http://example.com/> .
@prefix dbo:  <http://dbpedia.org/ontology/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix sp:   <http://spinrdf.org/sp#> .

_:person sp:varName "person" .
_:name sp:varName "_name" .
_:birthDate sp:varName "_birthDate" .
_:deathDate sp:varName "_deathDate" .

:query a sp:Select, sp:Query ; 
  rdfs:comment "Get persons from DBpedia"@en ;
  sp:resultVariables (_:person
                      [ a sp:Sample ;
                        sp:expression _:name ;
                        sp:as [ sp:varName "name" ]]
                      [ a sp:Sample ;
                        sp:expression _:birthDate ;
                        sp:as [ sp:varName "birthDate" ]]
                      [ a sp:Sample ;
                        sp:expression _:deathDate ;
                        sp:as [ sp:varName "deathDate" ]]) ;
  sp:where ([ a sp:SubQuery ;
              sp:query [ a sp:Select ;
                         sp:resultVariables (_:person) ;
                         sp:where ([ a sp:SubQuery ;
                                     sp:query [ a sp:Select ;
                                                sp:resultVariables (_:person) ;
                                                sp:distinct true ;
                                                sp:where ([ sp:subject _:person ;
                                                            sp:predicate rdf:type ;
                                                            sp:object foaf:Person ]) ;
                                                sp:orderBy (_:person) ]]) ;
                         sp:limit 10000 ;
                         sp:offset 0 ]]
             [ sp:subject _:person ;
               sp:predicate foaf:name ;
               sp:object _:name ]
             [ sp:subject _:person ;
               sp:predicate dbo:birthDate ;
               sp:object _:birthDate ]
             [ a sp:Optional ;
               sp:elements ([ sp:subject _:person ;
                              sp:predicate dbo:deathDate ;
                              sp:object _:deathDate ])]) ;
  sp:groupBy (_:person) .