<https://www.radioforen.de/threads/headset-oder-lieber-das-gute-alte-mike.1069/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.radioforen.de/threads/headset-oder-lieber-das-gute-alte-mike.1069/#post-13647>