This composite change will convert a defined class to a primitive class by
replacing equivalent classes axioms where the class in question is a class in
the equivalent classes axioms to a set of subclass axioms whose superclasses
are the set of classes which were originally equivalent to the class in
More formally, for a given class A, a set of ontologies S, and a target
ontology T, this composite change will remove all equivalent axioms from each
ontology O in S where the equivalent class axiom contains A as a 'top level'
class (e.g. EquivalentClasses(A, C, D)). For each class, D, that was made
equivalent to A via an equivalent classes axiom, a subclass axiom
SubClassOf(A, D) will be added to the target ontology T.
This change supports a common pattern of working, where a class is converted
from a defined class to a primitive class.
Matthew Horridge, The University Of Manchester, Bio-Health Informatics Group