<https://www.aidex.com/wp-content/uploads/2017/07/Green-Energy-in-Buildings-Trainer.pdf#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.aidex.com/product/green-energy-in-buildings-trainer/green-energy-in-buildings-trainer-2>