Question: In which city is the building, whose part is the Martin AN/FSG1 anti aircraft system?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/part> <http://dbpedia.org/resource/Martin_AN/FSG-1_Antiaircraft_Defense_System> . ?x <http://dbpedia.org/property/district> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Building>}