<https://forum.pcgames.de/threads/black-mesa-style-fuer-stilvolle-gamer.9370006/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.pcgames.de/threads/black-mesa-style-fuer-stilvolle-gamer.9370006/#post-10141841>