PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The were able to use the water vapor, nitrogen, methane and ammonia that made up Earth's atmosphere for food and energy, probably through a process facilitated or catalyzed by metals such as iron and magnesium.
http://www.w3.org/ns/prov#wasQuotedFrom
  • sciencedaily.com