About: http://webisa.webdatacommons.org/328551463

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	To facilitate the construction of and optimization of complex queries, such as the one described above, the system preferably utilizes a Constraint Tree.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com