<https://www.dropzone.com/forums/topic/23667-vortex-product-service-bulletin/page/4/#comment-4486376>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.dropzone.com/forums/topic/23667-vortex-product-service-bulletin/page/4/?tab=comments#comment-4489335>