<http://analogion.com/forum/index.php?members/aposto.1982/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://analogion.com/forum/index.php?threads/%CE%9C%CE%B7%CE%BB%CE%B9%CF%8E%CE%BD%CE%B7%CF%82-%CE%A4%CF%89%CE%BD-%CE%91%CE%B3%CE%AF%CF%89%CE%BD-%CE%A0%CE%B1%CF%84%CE%AD%CF%81%CF%89%CE%BD-%CE%BF-%CF%87%CE%BF%CF%81%CF%8C%CF%82.34893/#post-205467>