Question: Which were the philosophers whose primary interest was Natural philosophy?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE {?uri prop:mainInterests <http://dbpedia.org/resource/Natural_philosophy>  . ?uri rdf:type onto:Philosopher}