Question: How many people have headed organizations headquartered at Niederkirchnerstrae?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:headquarter <http://dbpedia.org/resource/NiederkirchnerstraÃŸe> . ?x onto:leader ?uri . }