<https://www.eastontechnology.com/single-post/2016/11/21/what-makes-up-the-new-standard-for-business-email>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.eastontechnology.com/single-post/2016/11/21/what-makes-up-the-new-standard-for-business-email>