<https://a-man-of-40-years-old-blog.com/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://a-man-of-40-years-old-blog.com/%E3%82%AF%E3%83%AD%E3%83%8D%E3%82%B3%E9%85%8D%E9%81%94%E6%A1%88%E5%86%85%E4%BF%82/>