<https://balloonia.gr/blog/item/429-\u03BC\u03B9\u03BA\u03C1\u03AC-\u03BC\u03C5\u03C3\u03C4\u03B9\u03BA\u03AC.html>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://balloonia.gr/blog/item/429-%CE%BC%CE%B9%CE%BA%CF%81%CE%AC-%CE%BC%CF%85%CF%83%CF%84%CE%B9%CE%BA%CE%AC.html>