<https://www.echichimato.com/archives/tag/%e8%b2%a7%e4%b9%b3-%e5%be%ae%e4%b9%b3/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.echichimato.com/archives/tag/%E8%B2%A7%E4%B9%B3-%E5%BE%AE%E4%B9%B3/>