<https://iasbaba.com/2017/08/iasbabas-tlp-optional-2017-history-23rd-aug-2017-day-29/#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://iasbaba.com/2017/08/iasbabas-tlp-optional-2017-history-23rd-aug-2017-day-29/>