What is the {river} for {origin of the watercourse} of {Aachen}
What is the name of the river that pass through Aachen
What river runs through Aachen?
SELECT DISTINCT ?f WHERE { ?f property:origin_of_the_watercourse resource:Aachen . ?f rdf:type ontology:river }
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/P885> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q1017> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q4022> } 
 select distinct ?sbj where { ?sbj wdt:P885 wd:Q1017 . ?sbj wdt:P31 wd:Q4022 } 
Wurm