<https://www.bunnybunch.nl/forums/topic/87098-forumspelletje-woordenslang/page/13/#comment-2147787>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.bunnybunch.nl/forums/topic/87098-forumspelletje-woordenslang/page/13/#comment-2147781>