Question: Who had headed the governmental agencies whose admin HQ was in Niederkirchnerstrasse?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?x onto:headquarter <http://dbpedia.org/resource/Niederkirchnerstraße> . ?x onto:leader ?uri  . ?x rdf:type onto:GovernmentAgency}