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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.coinkade.com/tag/%D8%B1%D9%BE%D8%AF-%D8%AA%D9%88%DA%A9%D9%86-%D8%A7%D8%AA%D8%B1%DB%8C%D9%88%D9%85/>