PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • However, NaCl crystals were a significant component and salt has apparently never before been found in significant quantities in a volcanic cloud.
http://www.w3.org/ns/prov#wasQuotedFrom
  • si.edu