PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • In order to protect rare earth resources, it has promulgated a number of policies over the years to limit over-exploitation and export of rare earth, including mining license control, total quantity control, export quotas, special invoice system, etc., whose implementation has caused supply decrease and price increase as far as Chinese rare earth products are concerned.
http://www.w3.org/ns/prov#wasQuotedFrom
  • researchmoz.us