<https://www.karras-marine-electronics.com/post/2017/04/22/network-multi-beam-sonar-dff-3d>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.karras-marine-electronics.com/post/2017/04/22/network-multi-beam-sonar-dff-3d>