<https://sakura-sake.com/%e3%80%90%e5%b0%8f4%e3%80%91%e5%ae%b6%e3%81%a7%e9%81%8a%e3%81%b9%e3%82%8b%e3%82%88%e3%81%86%e3%81%ab/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sakura-sake.com/%E3%80%90%E5%B0%8F4%E3%80%91%E5%AE%B6%E3%81%A7%E9%81%8A%E3%81%B9%E3%82%8B%E3%82%88%E3%81%86%E3%81%AB/>