About: http://webisa.webdatacommons.org/409306855

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	The 'as' keyword does not work on value types actually, so it always sets to null.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com