PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • CSX has confirmed that most of its oil comes from the Bakken Shale in North Dakota, a type of oil which the Pipeline and Hazardous Materials Safety Administration has warned could be especially flammable due to either particular properties of the oil or added chemicals from the hydraulic fracturing process used to extract it.
http://www.w3.org/ns/prov#wasQuotedFrom
  • thinkprogress.org