About: http://webisa.webdatacommons.org/71541926

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	EDIT: Assuming that the link is a sibling of the caption, something like this should work:
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com