PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Precious metals such as platinum and gold can be used as catalysts for these reactions, but they are expensive and operate at limited efficiency.
http://www.w3.org/ns/prov#wasQuotedFrom
  • mit.edu