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http://www.eclipse.org/emf
2. OWL 2 Web Ontology Language document overview (second edition).
http://www.w3.org/TR/owl2-overview/
3. OWL Web Ontology Language reference.
http://www.w3.org/TR/owl-ref/
4. Hellerstein, J.M., et al.: Ground: a data context service. In: Proceedings of CIDR (2017)
5. Ambler, S.: Mapping objects to relational databases: O/R mapping in detail.
http://www.agiledata.org/essays/mappingObjects.html