Question: Give me the websites of companies with more than 500000 employees.
SPARQL:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri 
WHERE 
{
	?subject rdf:type onto:Company .
	?subject prop:numEmployees ?employees .
	FILTER( xsd:integer(?employees) >= 500000 ) .
	?subject foaf:homepage ?uri .
}