About: http://webisa.webdatacommons.org/423495307

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	The following three examples show how to implement three kinds of outer joins in ANSI-compliant syntax: the simple outer join, the nested outer join, and the multiple outer join.
http://www.w3.org/ns/prov#wasQuotedFrom	roguewave.com