PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • In most economic evaluations of alternative energy systems, such as solar, wind, and biomass, natural gas prices are used as the basis for comparison, in other words, the opportunity cost of electricity from these new technologies is the avoided cost of electricity produced from natural gas.
http://www.w3.org/ns/prov#wasQuotedFrom
  • azlibrary.gov