About: http://webisa.webdatacommons.org/444772309

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	How do I test whether an object is an instance of a particular class in Objective-C?
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com