PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • NRC identifies critical minerals as platinum group metals ??? such as iridium, palladium and ruthenium ??? and rare earth elements such as cerium, indium and europium.
http://www.w3.org/ns/prov#wasQuotedFrom
  • watchdog.org