About: http://webisa.webdatacommons.org/318825556

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	But on my ubuntu 12.04 server unoconv is failing for some formats such as xls, ppt, ...
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com