<https://www.newbienote.com/2014/02/tutorial-langkah-langkah-konfigurasi.html>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.newbienote.com/2014/02/tutorial-langkah-langkah-konfigurasi.html?showComment=1537675469939>