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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://h.coffee/en-us/blogs/tencho/%E7%94%9F%E8%B1%86%E3%81%A1%E3%82%87%E3%81%A3%E3%81%B4%E3%82%8A%E3%82%BB%E3%83%BC%E3%83%AB%E4%B8%AD%E3%81%A7%E3%81%99>