Question: What is the state of origin of the president whose alma mater is Hellenic Naval Academy ?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?x prop:almaMater <http://dbpedia.org/resource/Hellenic_Naval_Academy> . ?x onto:stateOfOrigin ?uri  . ?x rdf:type onto:President}