About: http://webisa.webdatacommons.org/67919914

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	Thus, the salesperson issuing the ad request is informed that only 500K ad impressions are available for sale, i.e. only half of his request can be satisfied.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com