<https://www.velomobilforum.de/forum/index.php?threads/ein-velocamper-in-der-planung.64064/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.velomobilforum.de/forum/index.php?threads/ein-velocamper-in-der-planung.64064/#post-1353120>