Ontology Introduction
http://ontologydesignpatterns.org/wiki/Training:Tutorial:_Methods_and_Tools_for_Modular_Ontology_Modeling
https://stackoverflow.com/questions/51615618/owl-proteg%C3%A9-using-the-same-object-property-for-different-domains-ranges
https://henrietteharmse.com/2018/05/10/understanding-owl-universal-property-restrictions/
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