About: http://webisa.webdatacommons.org/339901655

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	You MUST prototype non-nullable properties, including value types and structs, but you may omit any nullable properties, including Nullable<T> and reference types, that you do not need to send.
http://www.w3.org/ns/prov#wasQuotedFrom	codeproject.com