<https://amethyst-mc.com/%e3%83%98%e3%83%83%e3%82%bf%e3%82%99%e3%83%bc%e3%83%ad%e3%82%b3%e3%82%99/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://amethyst-mc.com/%E3%83%98%E3%83%83%E3%82%BF%E3%82%99%E3%83%BC%E3%83%AD%E3%82%B3%E3%82%99/>