private function addUrlAliasSection(ArrayNodeDefinition $rootNode)
    {
        return $rootNode
            ->children()
                ->arrayNode('url_alias')
                    ->children()
                        ->arrayNode('slug_converter')
                            ->children()
                                ->scalarNode('transformation')->end()
                                ->scalarNode('separator')->end()
                                ->arrayNode('transformation_groups')
                                    ->arrayPrototype()
                                        ->children()
                                            ->arrayNode('commands')
                                                ->scalarPrototype()->end()
                                            ->end()
                                            ->scalarNode('cleanup_method')->end()
                                        ->end()
                                    ->end()
                                ->end()
                            ->end()
                        ->end()
                    ->end()
                ->end()
            ->end();
    }