<https://geekazine.com/5minpod/googles-5-year-beta-why-we-should-regulate-the-terms/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://geekazine.com/5minpod/googles-5-year-beta-why-we-should-regulate-the-terms/>