<https://www.stoneharborhardware.com/blogs/articles/hardware-basics-how-to-determine-the-radius-of-a-hinge>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.stoneharborhardware.com/blogs/articles/hardware-basics-how-to-determine-the-radius-of-a-hinge>