PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Since wind energy tends to compete with the cost of fossil fuels used to produce electricity (mostly natural gas and coal in the US), a low price for natural gas is a problem because even greater subsidies will be required for wind energy to be competitive.
http://www.w3.org/ns/prov#wasQuotedFrom
  • siliconinvestor.com