Question: List common systems are developed by of the Google Videos and written by of the Google Web Toolkit ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Google_Videos> <http://dbpedia.org/property/developer> ?uri. <http://dbpedia.org/resource/Google_Web_Toolkit> <http://dbpedia.org/ontology/author> ?uri}