<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/Book>
<https://ar.scribd.com/presentation/13922607/%D9%85%D8%B1%D8%A7%D8%AD%D9%84-%D8%AA%D9%83%D9%88%D9%8A%D9%86-%D8%A7%D9%84%D8%AC%D9%86%D9%8A%D9%86>