PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Helium is chemically non-reactive, so it is useful for applications such as balloons and lasers, where non-flammability is extremely important.
http://www.w3.org/ns/prov#wasQuotedFrom
  • ck12.org