About: http://webisa.webdatacommons.org/101970345

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	No problem, we just need to make our MockDB throw an exception, e.g. by adding a method like this:
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com