<https://www.slashgear.com/usb-follow-focus-makes-your-a-dslr-serious-filmmaking-tool-13133165/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.slashgear.com/usb-follow-focus-makes-your-a-dslr-serious-filmmaking-tool-13133165/>