<https://www.tutorialchip.com/freebies/html5-web-design-templates/attachment/serenity-html5-template/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.tutorialchip.com/freebies/html5-web-design-templates/attachment/serenity-html5-template/>