<https://forum.feed-the-beast.com/threads/i-think-i-have-a-wisp-problem.14505/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.feed-the-beast.com/threads/i-think-i-have-a-wisp-problem.14505/page-2#post-252795>