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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://willcloud.jp/knowhow/%E3%83%A1%E3%83%BC%E3%83%AB%E9%85%8D%E4%BF%A1%E9%80%9F%E5%BA%A6%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6/>