Question: Who has canonized someone who's a doctor of the church?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/titles> <http://dbpedia.org/resource/Doctor_of_the_Church> . ?x <http://dbpedia.org/ontology/canonizedBy> ?uri  . }
Answer: The canonized saints who are also the doctor of the Church are [Pope Leo XIII, Anglican Communion, Eastern Orthodox Church, Catholic Church, Lutheranism, Pope John XXII].