Generating SPARQL: SPARQL S-Expressions

query.sse

(prefix ((dbo: <http://dbpedia.org/ontology/>)
         (foaf: <http://xmlns.com/foaf/0.1/>))
  (project (?person ?name ?birthDate ?deathDate)
    (extend ((?deathDate ?.2))
      (extend ((?birthDate ?.1))
        (extend ((?name ?.0))
          (group (?person) ((?.0 (sample ?_name)) (?.1 (sample ?_birthDate)) (?.2 (sample ?_deathDate)))
            (leftjoin
              (join
                (slice 0 10000
                  (project (?person)
                    (distinct
                      (project (?person)
                        (order (?person)
                          (bgp
                            (triple ?person <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> foaf:Person)
                            (triple ?person foaf:name ??0)
                            (triple ?person dbo:birthDate ??1)))))))
                (bgp
                  (triple ?person foaf:name ?_name)
                  (triple ?person dbo:birthDate ?_birthDate)))
              (bgp (triple ?person dbo:deathDate ?_deathDate)))))))))