private function addChainNode()
    {
        $builder = new TreeBuilder('chain');
        $node    = $this->getRootNode($builder, 'chain');

        $node
            ->fixXmlConfig('provider')
            ->children()
                ->arrayNode('providers')
                    ->prototype('scalar')->end()
                ->end()
            ->end()
        ;

        return $node;
    }
private function addChainNode()
    {
        $builder = new TreeBuilder('chain');
        $node    = $this->getRootNode($builder, 'chain');

        $node
            ->fixXmlConfig('provider')
            ->children()
                ->arrayNode('providers')
                    ->prototype('scalar')->end()
                ->end()
            ->end()
        ;

        return $node;
    }
private function addChainNode ( ) { $ builder = new TreeBuilder ( 'chain' ) ; $ node = $ this -> getRootNode ( $ builder , 'chain' ) ; $ node -> fixXmlConfig ( 'provider' ) -> children ( ) -> arrayNode ( 'providers' ) -> prototype ( 'scalar' ) -> end ( ) -> end ( ) -> end ( ) ; return $ node ; }
Build chain node configuration definition

@return \Symfony\Component\Config\Definition\Builder\TreeBuilder
Build chain node configuration definition