<https://hirano-sharoshi.com/column/20240507053230-a1683a6f-3826-4782-9e04-467cf4a184ed>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hirano-sharoshi.com/column/20240507053230-a1683a6f-3826-4782-9e04-467cf4a184ed>