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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.agr.rmutt.ac.th/?tag=%E0%B8%87%E0%B8%B2%E0%B8%99%E0%B8%A2%E0%B8%B2%E0%B8%99%E0%B8%9E%E0%B8%B2%E0%B8%AB%E0%B8%99%E0%B8%B0>