PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Sulphur dioxide is a product of burning fossil fuels and is the main cause of acid rain, while chemical oxygen demand measures chemicals like nitrogen and phosphorus that choke rivers and lakes by stripping the water of oxygen.
http://www.w3.org/ns/prov#wasQuotedFrom
  • terradaily.com