<https://omusubi-portal.com/introduction/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://omusubi-portal.com/introduction/%E3%82%89%E3%81%8F%E3%82%89%E6%96%B0%E9%81%93%E6%9D%B1/?post_id=476>