PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Because of the lack of reliable forecasts, the most accurate and reliable existing method for fixed platforms or mobile platforms such as ships or airplanes to obtain knowledge of propagation and radio interference is through direct real-time measurement and evaluation of ionospheric conditions between the desired communication nodes using ionospheric sounders.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com