<https://www.thesbcommunity.com/forums/index.php?/topic/11714-ask-the-kat/page/2197/#comment-931605>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.thesbcommunity.com/forums/index.php?/topic/11714-ask-the-kat/page/2197/#comment-931575>