About: http://webisa.webdatacommons.org/85200048

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	Nullify responses such as 502 specify that a request to the node that is pointed to by a back pointer nullified the rollout request and therefore this node must make a new request.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca