<https://www.domino-printing.com/en-gb/blog/2015/how-ip-ratings-affect-coding-marking-and-printing>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.domino-printing.com/en-gb/blog/2015/how-ip-ratings-affect-coding-marking-and-printing>