<https://blog.toadworld.com/2017/05/24/should-i-build-a-1x6-vm-or-a-6x1-vm#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.toadworld.com/2017/05/24/should-i-build-a-1x6-vm-or-a-6x1-vm>