PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Electronic variometers make the same calculations automatically, after allowing for factors such as the glider's theoretical performance, water ballast, headwinds/tailwinds and insects on the leading edges of the wings.Soaring flight computers, often used in combination with PDAs running specialized soaring software, have been specifically designed for use in gliders.
http://www.w3.org/ns/prov#wasQuotedFrom
  • schools-wikipedia.org