Question: How many ships belong to states which has Unitary as government type ?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:governmentType <http://dbpedia.org/resource/Unitary_state> . ?uri onto:country ?x  . ?uri rdf:type onto:Ship}