About: http://webisa.webdatacommons.org/54711415

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 underscore method is a rails helper, but is unnecessary here because gsub(/[^\w\/]+/, _) already takes care of any non-word character he is not a slash.
http://www.w3.org/ns/prov#wasQuotedFrom	railscasts.com