<https://elrai.net/tag/%d8%a3%d8%ba%d9%86%d9%8a%d8%a9-%d9%88%d9%84%d8%b3%d9%87/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://elrai.net/tag/%D8%A3%D8%BA%D9%86%D9%8A%D8%A9-%D9%88%D9%84%D8%B3%D9%87/>