<https://forum.ih8mud.com/threads/official-for-sale-trade-wtb-free-thread.611445/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.ih8mud.com/threads/official-for-sale-trade-wtb-free-thread.611445/page-183#post-14520140>