PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • For example, materials such as silicon, indium, cesium or even gases such as argon, krypton or oxygen can be utilized as ion sources.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com