<https://signson7th.com/signs-by-type/routed-sign-letters/wall-mounted-routed-letters/#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://signson7th.com/index.php/signs-by-type/routed-sign-letters/wall-mounted-routed-letters/>