About: http://webisa.webdatacommons.org/328300233

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 remember that the check was put in because once the data was tried to be fetched no message could be produced if there was a problem, so the pre check is and remains a good idea.
http://www.w3.org/ns/prov#wasQuotedFrom	avsforum.com