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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.mizudori-guide.com/single-post/mizudori%E5%85%AC%E5%BC%8Fline-%E5%A7%8B%E3%82%81%E3%81%BE%E3%81%97%E3%81%9F>