<https://ts-map.com/ipb/#website>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ts-map.com/ipb/index.php?/forum/46-%E3%83%9E%E3%82%AB%E3%83%86%E3%82%A3%E3%81%AE%E3%83%9B%E3%83%86%E3%83%AB/>