About: http://webisa.webdatacommons.org/185005433

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	FIGS. 19 and 20 are display examples of data of join operation object by separating two trees of internal data and external data.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com