Question: List some people who were opponents of someone who was died by hanging? 
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 { ?x prop:deathCause <http://dbpedia.org/resource/Hanging> . ?x onto:opponent ?uri  . ?x rdf:type onto:Person}