<https://www.ericbourret.com/se/elektronisk/3d-husplan-4-programvara-for-3-dimensionella/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.ericbourret.com/se/elektronisk/3d-husplan-4-programvara-for-3-dimensionella/>