Question: Give me all world heritage sites designated within the past five years.
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT DISTINCT ?uri ?string WHERE {
	?uri rdf:type onto:WorldHeritageSite .
	?uri prop:year ?x .
	FILTER ( ?x >= "2007"^^xsd:integer)
        OPTIONAL { ?uri rdfs:label ?string. FILTER (lang(?string) = 'en') }
}