About: http://webisa.webdatacommons.org/39737000

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	Self joining just to set one column to the value of another is a bit... well, silly is probably the politest word.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com