PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Hard commodities include industrial and precious metals, such as gold, copper, nickel, silver, platinum, and zinc.
http://www.w3.org/ns/prov#wasQuotedFrom
  • commodityhq.com