PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • However, they also can generate useful fuels, such as methane and hydrogen, and we are pursuing research on all of these renewable-energy forms.
http://www.w3.org/ns/prov#wasQuotedFrom
  • bio-medicine.org