<https://ffmuc.net/wiki/doku.php?id=knb:meet-server>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ffmuc.net/wiki/doku.php?id=knb:meet-server&ns=knb&tab_files=files&do=media&tab_details=view&image=unifi-ap-2.png>