private function addImagePlaceholderSection(ArrayNodeDefinition $rootNode)
    {
        $rootNode
            ->children()
                ->arrayNode('image_placeholder')
                    ->info('Configuration for strategy of replacing missing images')
                    ->useAttributeAsKey('name')
                    ->arrayPrototype()
                        ->children()
                            ->scalarNode('provider')
                            ->end()
                            ->variableNode('options')
                                ->defaultValue([])
                            ->end()
                        ->end()
                    ->end()
                ->end()
            ->end();
    }