About: http://webisa.webdatacommons.org/209918020

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	ruby on rails - How to validate that a string is a year - Stack Overflow
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com