About: http://webisa.webdatacommons.org/18197454

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	Let R be a set of safe rule implications ?? :- ?? and let P be the set of pairs (p,n), where p is a predicate symbol and n is a nonnegative integer (an arity).
http://www.w3.org/ns/prov#wasQuotedFrom	w3.org