About: http://webisa.webdatacommons.org/249302119

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	You are right on the first point -- correct algorithm + bug is not the point, although the discussion and other examples are conflating them as well.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com