<https://www.t-rocforum.de/threads/facelift-f%C3%BCr-den-t-roc.3430/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.t-rocforum.de/threads/facelift-f%C3%BCr-den-t-roc.3430/page-9#post-95866>