About: http://webisa.webdatacommons.org/288128799

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	The problem here is that .NET 1.x does not allow for simple types like DateTime, Integer, Double, etc, to be null.
http://www.w3.org/ns/prov#wasQuotedFrom	intertwingly.net