About: http://webisa.webdatacommons.org/355961240

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	User-defined operators can specify relation and tuple types as parameters and return types.
http://www.w3.org/ns/prov#wasQuotedFrom	c2.com