<https://ikariadviser.com/2015/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ikariadviser.com/2015/06/17/%E5%A4%AB%E5%A9%A6%E3%81%8C%E5%81%A5%E5%BA%B7%E3%81%A7%E3%81%84%E3%82%89%E3%82%8C%E3%82%8B%E3%81%9F%E3%82%81%E3%81%AB/>