<https://magnoliahomeremodeling.com/blog/articles/marvin-vs-andersen-windows-which-should-you-choose/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://magnoliahomeremodeling.com/blog/articles/marvin-vs-andersen-windows-which-should-you-choose/>