About: http://webisa.webdatacommons.org/199861445

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	So, I assumed Apple was doing something special for PDF files and other files they work with extensively.
http://www.w3.org/ns/prov#wasQuotedFrom	wolfram.com