About: http://webisa.webdatacommons.org/185902027

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	expression can be e.g. equality, column or select statement, so there is need to put all this cases when defining method Where.
http://www.w3.org/ns/prov#wasQuotedFrom	digitalmars.com