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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://linguaholic.com/topic/24555-%E5%85%AB%E4%BB%99%E8%BF%87%E6%B5%B7%E3%80%90b%C4%81-xi%C4%81n-gu%C3%B2-h%C7%8Ei%E3%80%91/>