Question: Who developed the software for the operating system of Macintosh Quadra 660AV ?
SPARQL query: SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Macintosh_Quadra_660AV> <http://dbpedia.org/ontology/operatingSystem> ?x . ?x <http://dbpedia.org/ontology/developer> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Software>}
Answer: [Apple Inc.] is the developer of the software which is the operating system of Macintosh Quadra 660AV.