expect:
        ModelPath.ROOT.isDirectChild(ModelPath.path("p"))
        !ModelPath.ROOT.isDirectChild(ModelPath.ROOT)
        !ModelPath.ROOT.isDirectChild(ModelPath.path("a.b"))

        ModelPath.path("a.b").isDirectChild(ModelPath.path("a.b.c"))
        !ModelPath.path("a.b").isDirectChild(ModelPath.path("a.b.c.d"))
        !ModelPath.path("a.b").isDirectChild(ModelPath.path("a.a.b"))

        return linked != null && predicate.apply(linked);
    }

    @Override
    public void applyToLink(ModelActionRole type, ModelAction action) {
        if (!getPath().isDirectChild(action.getSubject().getPath())) {
            throw new IllegalArgumentException(String.format("Linked element action reference has a path (%s) which is not a child of this node (%s).", action.getSubject().getPath(), getPath()));

    }

    public String getName() {
        if (components.length == 0) {
            return "";
        }
        return components[components.length - 1];
    }

    public boolean isDirectChild(@Nullable ModelPath other) {
        if (other == null) {
            return false;
        }
        if (other.components.length != components.length + 1) {
            return false;
        }

        return projectPath;
    }

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