<https://www.bav.bg/blog/%d1%83%d0%bf%d1%80%d0%b0%d0%b6%d0%bd%d0%b5%d0%bd%d0%b8%d1%8f-%d0%b7%d0%b0-%d0%b3%d1%8a%d1%80%d0%b4%d0%b8/#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.bav.bg/blog/%D1%83%D0%BF%D1%80%D0%B0%D0%B6%D0%BD%D0%B5%D0%BD%D0%B8%D1%8F-%D0%B7%D0%B0-%D0%B3%D1%8A%D1%80%D0%B4%D0%B8/>