About: http://webisa.webdatacommons.org/113231119

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	The alternative is to use try. try is like Object#send except that it returns nil if sent to nil.Here is an example:
http://www.w3.org/ns/prov#wasQuotedFrom	rubyonrails.org