<https://www.specifyandbuild.co.uk/post/sika-launches-a-new-white-paper-to-the-specification-market>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.specifyandbuild.co.uk/post/sika-launches-a-new-white-paper-to-the-specification-market>