arraycopy(components, 0, childComponents, 0, components.length);
        childComponents[components.length] = child;
        return path(path + "." + child, childComponents);
    }

    public ModelPath getRootParent() {
        return components.length <= 1 ? null : ModelPath.path(components[0]);
    }

    @Nullable
    public ModelPath getParent() {
        return parent;
    }

        if (!ModelPath.ROOT.isDirectChild(path)) {
            throw new InvalidModelRuleDeclarationException(registration.getDescriptor(), "Cannot register element at '" + path + "', only top level is allowed (e.g. '" + path.getRootParent() + "')");
        }

        ModelNodeInternal root = modelGraph.getRoot();
        root.addLink(registration);
        return this;
    }

    @Override