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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.mdrscenter.com/glossary/%D8%A7%D9%84%D9%85%D9%8A%D8%B2%D8%A7%D9%86%D9%8A%D8%A9-%D8%A7%D9%84%D8%B9%D9%85%D9%88%D9%85%D9%8A%D8%A9/>