<https://forums.deeperblue.com/threads/leaving-the-world-behind-ii-return-to-tahsis.31376/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forums.deeperblue.com/threads/leaving-the-world-behind-ii-return-to-tahsis.31376/#post-209512>