<https://ainpedia.com/article/%D9%83%D9%84%D8%A7%D9%85-%D8%AC%D9%85%D9%8A%D9%84-%D9%88%D9%82%D8%B5%D9%8A%D8%B1-%D8%B9%D9%86-%D8%A7%D9%84%D8%AD%D9%8A%D8%A7%D8%A9-46>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ainpedia.com/article/%D9%83%D9%84%D8%A7%D9%85-%D8%AC%D9%85%D9%8A%D9%84-%D9%88%D9%82%D8%B5%D9%8A%D8%B1-%D8%B9%D9%86-%D8%A7%D9%84%D8%AD%D9%8A%D8%A7%D8%A9-46>