About: http://webisa.webdatacommons.org/23199390

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	This does sound like Nullable<T> I give you that, but it is a F# type after all, so you can expect it to ok to use in F# things, such as pattern matching etc etc.
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.com