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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.darumabooks.com/books/category/%E6%84%9B%E7%9F%A5%E7%9C%8C/%E3%80%90%E5%8F%A4%E6%9C%AC%E8%B2%B7%E5%8F%96%E3%80%91%E6%84%9B%E7%9F%A5%E7%9C%8C%E3%81%BF%E3%82%88%E3%81%97%E5%B8%82>