About: http://webisa.webdatacommons.org/144321946

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	> top level of the join tree is a CROSS JOIN node with all the FROM-clause
http://www.w3.org/ns/prov#wasQuotedFrom	postgresql.org