Question: Which field's journals are edited by Paul Morphy?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/editor> <http://dbpedia.org/resource/Paul_Morphy> . ?x <http://dbpedia.org/property/discipline> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/AcademicJournal>}