About: http://webisa.webdatacommons.org/244837774

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	Additionally, for any given query evaluation plan, the question of estimating its efficiency without actually processing the query is a problem that has captivated much research.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com