What is the {poem} for {creator} of {Langston Hughes}
Name a poem written by Langston Hughes.
Which is the titled poem by Langston Hughes?
SELECT DISTINCT ?o WHERE { ?o property:creator resource:Langston_Hughes . ?o rdf:type ontology:poem }
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P170> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q188093> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q5185279> } 
 select distinct ?sbj where { ?sbj wdt:P170 wd:Q188093 . ?sbj wdt:P31 wd:Q5185279 } 
The Negro Speaks of Rivers