About: http://webisa.webdatacommons.org/248300268

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	It allows for generalised control structures to perform customised operations which are specified by your code which is called from within them, hence the term call back - it calls back into your code.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com