<https://hoernchenvilla.de/wbb52/forum/index.php?thread/23308-wichteln-2019/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hoernchenvilla.de/wbb52/forum/index.php?thread/23308-wichteln-2019/&postID=329905>