PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The chemicals" they inject are mostly just water and sand and a few detergents to increase flow viscosity along with ceramic pebbles.
http://www.w3.org/ns/prov#wasQuotedFrom
  • economist.com