<https://www.marstyle.nl/2016/12/07/budgetkunst-wij-maakten-kennis-met-wervelend/#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://marstyle.nl/2016/12/07/budgetkunst-wij-maakten-kennis-met-wervelend/>