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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kunitachi.net/blog/tag/gemini-pda%E3%81%AE%E3%81%9F%E3%82%81%E3%81%AE%E3%83%AC%E3%82%B6%E3%83%BC%E3%82%B9%E3%83%BC%E3%83%84/>