PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Although industry argues that not a single case of water contamination has been conclusively attributed to fracking, methane and other contaminants are appearing in drinking water and near-surface geology after the drill-and-frack sequence.
http://www.w3.org/ns/prov#wasQuotedFrom
  • whyfiles.org