<https://www.hearth.com/talk/threads/sanity-check-quote-for-install-and-supply-of-pipe.187663/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.hearth.com/talk/threads/sanity-check-quote-for-install-and-supply-of-pipe.187663/>