Sylius\Bundle\OrderBundle\DependencyInjection\Configuration::getConfigTreeBuilder PHP Method

    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder();
        $rootNode = $treeBuilder->root('sylius_order');
        $rootNode->addDefaultsIfNotSet()->children()->scalarNode('driver')->defaultValue(SyliusResourceBundle::DRIVER_DOCTRINE_ORM)->end()->end();
        $this->addResourcesSection($rootNode);
        $this->addExpirationPeriodsSection($rootNode);
        return $treeBuilder;
    }