<https://crew.org.nz/forum/index.php?/forums/topic/19028-sailgp/page/8/#comment-283391>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://crew.org.nz/forum/index.php?/forums/topic/19028-sailgp/page/8/&tab=comments#comment-283377>