PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX rel: <http://purl.org/vocab/relationship/>
SELECT DISTINCT ?name
WHERE { 
   ?doc foaf:maker ?author .
   { ?author foaf:knows ?someone . }
    		UNION
    {?author rel:hasMet ?someone . }
    ?someone foaf:name ?name .
 }
 ORDER BY DESC (?name)
