<https://kararara.com/forum/viewtopic.php?f=80&amp;t=8606&amp;p=130707d1c0432e9b6e542118c24b01581e4c1>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kararara.com/forum/viewtopic.php?f=80&t=8606&p=13070&sid=7d1c0432e9b6e542118c24b01581e4c1>