About: http://webisa.webdatacommons.org/440875186

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 question is a bit confusing...you ask for a union, but you code snippet looks like you are looking for the intersection.
http://www.w3.org/ns/prov#wasQuotedFrom	perlmonks.org