Question: How many units follow the US Navy Department's command structure?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX res: <http://dbpedia.org/resource/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE {?uri onto:commandStructure <http://dbpedia.org/resource/United_States_Department_of_the_Navy> . ?uri rdf:type onto:MilitaryUnit}