};
    DefaultNamedDomainObjectSet<Bean> container = instantiator.newInstance(DefaultNamedDomainObjectSet.class, Bean.class, instantiator, namer, callbackActionDecorator)
    Bean a = new BeanSub1("a")
    Bean b = new BeanSub1("b")
    Bean c = new BeanSub1("c")
    Bean d = new BeanSub2("d")
    boolean externalProviderAllowed = true
    boolean directElementAdditionAllowed = true
    boolean elementRemovalAllowed = true