<https://secure.gravatar.com/avatar/d16800a2d7b05f138ef7ac319875716b?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://arhimedbg.com/bookstore-2/informacioni-tehnologii-7-klas/>