<https://billshander.com/visualizing-large-datasets/screen-shot-2020-09-21-at-4-55-57-pm/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://billshander.com/visualizing-large-datasets/screen-shot-2020-09-21-at-4-55-57-pm/>