About: http://webisa.webdatacommons.org/401052111

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	I had never seen this from the point of view of option types and would always heavily miss them when coding in C++.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com