About: http://webisa.webdatacommons.org/50490228

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	It is furthermore preferred that any document, such as a facsimile or an electronic mail message be uniquely checksummed using algorithm for future identification of the document.
http://www.w3.org/ns/prov#wasQuotedFrom	docstoc.com