PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT *
WHERE {
 ?person a foaf:Person.
 { ?person foaf:name ?name } UNION
 { ?person foaf:mbox ?mbox } UNION
 { ?person foaf:homepage ?homepage } UNION
 { ?person foaf:mbox_sha1sum ?mbox_sha1sum } UNION
 { ?person foaf:nick ?nick } UNION
 { ?person rdfs:seeAlso ?seeAlso }
}