About: http://webisa.webdatacommons.org/137632898

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	I do not know about Question 2, and I have not looked at the paper that you link to, but it seems worth pointing out that the algorithm you are interested in is an instance of a much more general phenomenon.
http://www.w3.org/ns/prov#wasQuotedFrom	mathoverflow.net