<https://t-kintaro.com/column/20231020014547-b94b4ecf-8cb3-4471-bd6a-94ea454b0c99>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://t-kintaro.com/column/20231020014547-b94b4ecf-8cb3-4471-bd6a-94ea454b0c99>