<https://bookynotes.com/ar/products/%d8%a3%d9%86%d8%a7-%d8%a3%d9%82%d8%af%d8%b1-%d8%b9%d9%84%d9%89-%d8%a7%d9%84%d8%aa%d9%88%d8%b5%d9%8a%d9%84-40-%d9%84%d8%b9%d8%a8%d8%a9#product>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://bookynotes.com/ar/products/%D8%A3%D9%86%D8%A7-%D8%A3%D9%82%D8%AF%D8%B1-%D8%B9%D9%84%D9%89-%D8%A7%D9%84%D8%AA%D9%88%D8%B5%D9%8A%D9%84-40-%D9%84%D8%B9%D8%A8%D8%A9>