Collects all of the nested class expression that are used in some OWLObject. For example, given SubClassOf(ObjectUnionOf(D C) ObjectSomeValuesFrom(R F)) the collector could be used to obtain ObjectUnionOf(D C), D, C, ObjectSomeValuesFrom(R F), F
@author Matthew Horridge, The University of Manchester, Bio-HealthInformatics Group
@since 3.1.0
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