<https://forum-raspberrypi.de/forum/thread/15102-2-sammelbestellung-tiny-r-t-x4/?pageNo=5>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum-raspberrypi.de/forum/thread/15102-2-sammelbestellung-tiny-r-t-x4/?postID=130527>