About: http://webisa.webdatacommons.org/218335503

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	I have tested yesterday on my localhost and when there was a request to image which does not exists it showed 404 error.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com