<https://www.edinburghgardenschool.com/2016/11/defining-cohesion-for-rhs-level-2/#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.edinburghgardenschool.com/2016/11/defining-cohesion-for-rhs-level-2/>