About: http://webisa.webdatacommons.org/375254698

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	Of course that will not work if the callback is an array or a string (which can also be valid callbacks in PHP) - just for closures and other objects with __invoke behavior.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com