Question: Give me all books by William Goldman with more than 300 pages.
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/>
PREFIX res: <http://dbpedia.org/resource/>
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:Book .
	?uri onto:author res:William_Goldman .
        ?uri onto:numberOfPages ?x .
        FILTER (?x > 300)
	OPTIONAL { ?uri rdfs:label ?string. FILTER (lang(?string) = 'en') }
}