<https://www.multimediaboom.com/2017/09/07/spam-filters-that-can-be-used-in-mac/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.multimediaboom.com/2017/09/07/spam-filters-that-can-be-used-in-mac/>