<https://hartandholm.com/de-de/blogs/news/alt-du-behover-at-vide-om-din-brillestyrke>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hartandholm.com/de-de/blogs/news/alt-du-behover-at-vide-om-din-brillestyrke>