About: http://webisa.webdatacommons.org/342814406

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	If they do not, then PDF is a must and if you want to include other file formats as well just to cover all bases.
http://www.w3.org/ns/prov#wasQuotedFrom	howtogeek.com