<https://tsuratan.com/2017/02/#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tsuratan.com/2017/02/21/%E8%87%AA%E5%88%86%E3%81%AE%E3%83%AB%E3%83%BC%E3%83%84%E3%82%92%E7%9F%A5%E3%82%8B%E6%96%B9%E6%B3%95%E3%81%A8%E3%81%AF%EF%BC%9F%E3%81%9D%E3%81%AE3/>