PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Given that coal is a possible source of energy for future electric power and liquid fuels as well as a potential substitute for natural gas, the research could not come at a better time.
http://www.w3.org/ns/prov#wasQuotedFrom
  • phys.org