<https://hashiribito-sodo.com/event57/%e2%91%a5%e9%9b%86%e5%90%88%e5%86%99%e7%9c%9f>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hashiribito-sodo.com/event57/%E2%91%A5%E9%9B%86%E5%90%88%E5%86%99%E7%9C%9F>