# bound join query
PREFIX ns1: <http://namespace1.org/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX owl:  <http://www.w3.org/2002/07/owl#>

SELECT ?person ?name WHERE {
 ?person rdf:type foaf:Person .
 ?person foaf:name ?name .
}