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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://shiki3.hatenablog.com/archive/category/%E2%98%85%E9%9B%B0%E5%9B%B2%E6%B0%97-%E4%B8%AD%E8%8F%AF%E3%83%BB%E6%B0%91%E6%97%8F%E9%A2%A8>