PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Yellowstone's hydrothermal vents release a mixture of gases including carbon dioxide, methane, neon, argon and helium.
http://www.w3.org/ns/prov#wasQuotedFrom
  • natureworldnews.com