void IClassExpressionVisitor.Visit(
     IObjectOneOf objectOneOf
     )
 {
     _enter?.Visit(objectOneOf);
     _exit?.Visit(objectOneOf);
 }
 bool IClassMembershipEvaluator.Evaluate(
     IObjectOneOf objectOneOf,
     object individual
     ) => objectOneOf.Individuals.Any(
     member => AreEqual(
         individual,
         member));
 public virtual void Visit(IObjectOneOf objectOneOf)
 {
 }