<https://pecaa.com/event/commonly-confused-modifiers-common-scenarios-of-misuse-and-how-to-use-them-properly/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://pecaa.com/event/commonly-confused-modifiers-common-scenarios-of-misuse-and-how-to-use-them-properly/>