Question: Is WP 8.1 the OS on Lumia 830?
SPARQL query: ASK WHERE { <http://dbpedia.org/resource/Nokia_Lumia_830> <http://dbpedia.org/property/os> <http://dbpedia.org/resource/Windows_Phone_8.1> }
Answer: [Yes], Windows Phone 8.1 is the OS of Nokia Lumia 830.