About: http://webisa.webdatacommons.org/212252835

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	My guess would be that both streams are compared to null in case there was an Exception while attempting to create them.
http://www.w3.org/ns/prov#wasQuotedFrom	javaprogrammingforums.com