PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Carbon dioxide, methane and other gases that absorb infrared also contribute to the greenhouse effect, and they and water vapor are collectively known as greenhouse gases.
http://www.w3.org/ns/prov#wasQuotedFrom
  • nasa.gov