How is it possible to perform Metamodelling in Protégé

Metamodelling happens if an IRI is used as a class and as an individual in two axioms. The topic is described at http://www.w3.org/TR/owl2-syntax/#Metamodeling.
1 answer

Use the Classes tab and the Individuals tab

Open Protégé and the respective ontology.
Change to the "Classes" tab and create the class.
Change to the "Individuals" tab and create the individual.
Protégé recognizes that the IRI already exists and accepts it.