PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • As the price of oil continues to increase and global oil production nears its peak, pursuing unconventional oil supplies, such as oil shale, heavy oil, coal and oil sands becomes increasingly attractive.
http://www.w3.org/ns/prov#wasQuotedFrom
  • pnnl.gov