public override void Remove(InterfaceElement el) { elements.Remove(el); }
public override void Add(InterfaceElement el) { elements.Add(el); }
public override void Remove(InterfaceElement el) { Console.WriteLine("Cannot remove from a PrimitiveElement"); }
public override void Add(InterfaceElement el) { Console.WriteLine("Cannot add to a PrimitiveElement"); }
public abstract void Remove(InterfaceElement el);
public abstract void Add(InterfaceElement el);