<https://blog.sketchup.com/youtube-all-videos/customize-your-edge-color-in-sketchup-quick-win-2>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.sketchup.com/youtube-all-videos/customize-your-edge-color-in-sketchup-quick-win-2>