About: http://webisa.webdatacommons.org/397717753

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	Edit: Clearly the best solution is a combination of your first and second points, which I neglected to read thoroughly before writing this answer.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com