About: http://webisa.webdatacommons.org/175937750

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	But it does not preclude the use of explicitly nullable / non-null types to achieve the same effect.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com