PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Helium is a product which is derived from natural gas during processing and is recovered from some natural gas deposits where it is found in low concentrations of less than 0.05%.
http://www.w3.org/ns/prov#wasQuotedFrom
  • rasgas.com