I have created two small ontologies. In one of the ontologies I define a class Human, in the other one class Person. In Person, I specify equivalent_to = [ontology1.Human]. After that I sync_reasoner([ontology1, ontology2]); and save both ontologies into two separate files. However, only Person in ontology2 has the owl:equivalentClass property, Human in ontology1 doesn't have that property? Is that a bug or equivalent_to is not symmetric? If so, then is there a way to set owl:SameAs property in Owlready2?