<https://www.yugyosen-base.com/single-post/2017/08/19/819-\u91E3\u679C\u5B89\u5B9A>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.yugyosen-base.com/single-post/2017/08/19/819-%E9%87%A3%E6%9E%9C%E5%AE%89%E5%AE%9A>