Question: What is the common product of the Apple Productivity Experience Group and services of the 21Vianet ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Apple_Productivity_Experience_Group> <http://dbpedia.org/ontology/product> ?uri. <http://dbpedia.org/resource/21Vianet> <http://dbpedia.org/property/services> ?uri}