About: http://webisa.webdatacommons.org/312501850

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	The book by Han and Hong cited by BS in his answer is a good source for many of these questions.
http://www.w3.org/ns/prov#wasQuotedFrom	mathoverflow.net