About: http://webisa.webdatacommons.org/249712127

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	operations, e.g. union, intersection, difference, and combinations
http://www.w3.org/ns/prov#wasQuotedFrom	thecodingforums.com