<https://blog.jakub-boucek.cz/2011/04/php-proc-si-napsat-vlastni-framework-cms-eshop/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.jakub-boucek.cz/2011/04/php-proc-si-napsat-vlastni-framework-cms-eshop/>