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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://08eigakan.hatenablog.jp/archive/category/%E3%82%AF%E3%83%AA%E3%82%B9%E3%83%BB%E3%83%97%E3%83%A9%E3%83%83%E3%83%88>