select ?dd, ?date, ?x, ?val, ?mb 
 from  file:rdf/000068.rdf 
 where (dc:description ?x ?dd) (dc:date ?x ?date) 
  (foaf:location ?x ?l) (rdf:value ?l ?val) 
  (foaf:depiction ?per ?x) (foaf:mbox ?per ?mb) 
 using dc for http://purl.org/dc/elements/1.1/ 
 foaf for http://xmlns.com/foaf/0.1/ 
 rdf for http://www.w3.org/1999/02/22-rdf-syntax-ns#