ASK WHERE {
<http://www.example.org/#article> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Document> .
<http://www.example.org/#article> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://rdfs.org/sioc/ns#Post> .
<http://www.example.org/#article> <http://purl.org/dc/terms/title> "My article" .
}