<<rule>> Create: Unique Named Structural Feature in Sub-Class

<<forbid, post>> postSuperClass : EClass <<forbid, post>> postSuperStructuralFeature : EStructuralFeature <<forbid, post>> name = structuralFeatureName <<preserve>> toSubClass : EClass <<create>> newSubStructuralFeature : EStructuralFeature <<create>> name = structuralFeatureName <<forbid, post>> eSuperTypes <<forbid, post>> eStructuralFeatures <<create>> eContainingClass eStructuralFeatures