PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • It uses a metric it calls Average Participation Rate (Average PR) to rate how likely it is for an ad to be displayed during the month, which tells the system whether to show the ad or hold off for the next occurrence of the keyword.
http://www.w3.org/ns/prov#wasQuotedFrom
  • searchenginewatch.com