Mine

PREFIX nfo: <http://nfo>
PREFIX nie: <http://nie>
PREFIX nco: <http://nco>
SELECT ?fileName ?url ?fileSize ?creator ?fileLastAccessed ?fileLastModified ?type
WHERE {
 ?u nfo:fileName ?fileName .
 ?u nie:url ?url .
 ?u nfo:fileSize ?fileSize .
 ?u nco:creator ?creator .
 ?u nfo:fileLastAccessed ?fileLastAccessed .
 ?u nfo:fileLastModified ?fileLastModified .
 ?u rdf:type ?type .
 {
   { ?u a nfo:PaginatedTextDocument }
   UNION
   { ?u a nfo:Presentation }
   UNION
   { ?u a nfo:Spreadsheet }
 }
}