<https://www.wrld3d.com/blog/3d-mapping-for-augmented-reality-and-vr-gaming-wrld/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://wrld3d.netlify.app/blog/3d-mapping-for-augmented-reality-and-vr-gaming-wrld/>