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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://maizuru-cwm.com/wordpress/%E3%83%9F%E3%83%8B%E5%9B%9B%E9%A7%86%E3%83%AC%E3%83%BC%E3%82%B9%E5%A4%A7%E4%BC%9A>