About: http://webisa.webdatacommons.org/377349513

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	For each cause, effect and intersection, there are three kinds of internal variables preceded by an underscore character which may be declared as shown in the Table I, below.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com