PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • For heavy elements such as uranium, achieving a suitable separation factor involves contact between two valence (oxidation state) forms such as hexavalent [U6+ as in uranyl chloride (UO2Cl2 )] and the quadrivalent [U4+ as in uranium tetrachloride (UCl4 )].
http://www.w3.org/ns/prov#wasQuotedFrom
  • fas.org