<https://kaenon.com/blogs/news/what-makes-sr-91-the-most-advanced-polarized-sunglass-lens-on-the-planet>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kaenon.com/blogs/news/what-makes-sr-91-the-most-advanced-polarized-sunglass-lens-on-the-planet>