Question: Give me all companies in the advertising industry.
SPARQL query:
PREFIX prop: <http://dbpedia.org/property/>
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:Company  .
        ?uri prop:industry ?industry .
        FILTER regex(?industry,'advertising','i') .
        OPTIONAL {?uri rdfs:label ?string . FILTER (lang(?string) = 'en') }
}