Eko\FeedBundle\DependencyInjection\Configuration::getConfigTreeBuilder PHP Method

    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder();
        $rootNode = $treeBuilder->root('eko_feed');
        $rootNode->children()->scalarNode('hydrator')->defaultValue('eko_feed.hydrator.default')->end()->scalarNode('translation_domain')->defaultNull()->end()->arrayNode('feeds')->requiresAtLeastOneElement()->useAttributeAsKey('name')->prototype('array')->children()->scalarNode('title')->isRequired()->end()->scalarNode('description')->isRequired()->end()->arrayNode('link')->isRequired()->beforeNormalization()->ifString()->then(function ($value) {
            return ['uri' => $value];
        })->end()->children()->scalarNode('route_name')->end()->arrayNode('route_params')->useAttributeAsKey('key')->prototype('scalar')->end()->end()->scalarNode('uri')->end()->end()->end()->scalarNode('encoding')->isRequired()->end()->scalarNode('author')->end()->end()->end()->end()->end();
        return $treeBuilder;
    }