About: http://webisa.webdatacommons.org/186201393

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	Admittedly, we use it in one of our enterprise solutions to go the other way - converting various text and file types to PDF. I guess the amount of effort required in using it is probably linked to the quality of the source files.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com