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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://yuitotaguchi.com/2018/07/13/%E7%AB%B6%E4%BA%89%E3%81%A3%E3%81%A6%E6%9C%80%E6%82%AA%E3%81%A0%E3%81%A8%E6%80%9D%E3%81%86/>