private boolean canAddComponents(Vector components) {
        final int size = components.size();
        final XSDDescription desc = new XSDDescription();
        for (int i=0; i<size; i++) {
            XSObject component = (XSObject) components.elementAt(i);
            if (!canAddComponent(component, desc)) {
                return false;
            }
        }
        return true;
    }