<https://resalapost.com/2020/07/15/%d9%85%d8%b0%d9%8a%d8%b9%d9%88%d9%86-%d9%88%d9%85%d8%b0%d9%8a%d8%b9%d8%a7%d8%aa/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://resalapost.com/2020/07/15/%D9%85%D8%B0%D9%8A%D8%B9%D9%88%D9%86-%D9%88%D9%85%D8%B0%D9%8A%D8%B9%D8%A7%D8%AA/>