<https://seodesignchicago.com/web-design-blog/http-vs-https-what-is-the-difference/site-navigation>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/SiteNavigationElement>
<https://seodesignchicago.com/web-design-blog/http-vs-https-what-is-the-difference/>