About: http://webisa.webdatacommons.org/444797172

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, in essence, what you described is a variation on the third point of your original post: a rolling token (which the session ID is) that is updated on every request.
http://www.w3.org/ns/prov#wasQuotedFrom	dreamincode.net