<https://blog.bricsys.com/how-much-can-bim-clash-detection-save-you-in-the-long-run/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.bricsys.com/how-much-can-bim-clash-detection-save-you-in-the-long-run/>