About: http://webisa.webdatacommons.org/346257257

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	return (o and o:normalize() or errorinvalid date time value), r -- if r is true then o is a reference to a date obj
http://www.w3.org/ns/prov#wasQuotedFrom	github.com