<https://www.blendernation.com/2020/04/18/seashells-a-free-and-open-source-blender-addon/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.blendernation.com/2020/04/18/seashells-a-free-and-open-source-blender-addon/>