PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • M1 is a metal of subgroup III, IV, V or VI of the Periodic Table of the Elements, especially Zr or Hf,
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com