<https://techcrunch.com/2013/02/07/google-now-uses-its-own-webp-format-instead-of-pngs-in-the-chrome-web-store/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://techcrunch.com/2013/02/07/google-now-uses-its-own-webp-format-instead-of-pngs-in-the-chrome-web-store/>