src/DependencyInjection/Configuration.php
public function getConfigTreeBuilder()
    {
        $tb = new TreeBuilder();
        $rootNode = $tb->root('acl');

        $rootNode
            ->children()
                ->scalarNode('connection')
                    ->defaultNull()
                    ->info('any name configured in doctrine.dbal section')
                ->end()
                ->arrayNode('cache')
                    ->addDefaultsIfNotSet()
                    ->children()
                        ->scalarNode('id')->end()
                        ->scalarNode('prefix')->defaultValue('sf_acl_')->end()
                    ->end()
                ->end()
                ->scalarNode('provider')->end()
                ->arrayNode('tables')
                    ->addDefaultsIfNotSet()
                    ->children()
                        ->scalarNode('class')->defaultValue('acl_classes')->end()
                        ->scalarNode('entry')->defaultValue('acl_entries')->end()
                        ->scalarNode('object_identity')->defaultValue('acl_object_identities')->end()
                        ->scalarNode('object_identity_ancestors')->defaultValue('acl_object_identity_ancestors')->end()
                        ->scalarNode('security_identity')->defaultValue('acl_security_identities')->end()
                    ->end()
                ->end()
                ->arrayNode('voter')
                    ->addDefaultsIfNotSet()
                    ->children()
                        ->booleanNode('allow_if_object_identity_unavailable')->defaultTrue()->end()
                    ->end()
                ->end()
            ->end()
        ;

        return $tb;
    }
public function getConfigTreeBuilder()
    {
        $tb = new TreeBuilder();
        $rootNode = $tb->root('acl');

        $rootNode
            ->children()
                ->scalarNode('connection')
                    ->defaultNull()
                    ->info('any name configured in doctrine.dbal section')
                ->end()
                ->arrayNode('cache')
                    ->addDefaultsIfNotSet()
                    ->children()
                        ->scalarNode('id')->end()
                        ->scalarNode('prefix')->defaultValue('sf_acl_')->end()
                    ->end()
                ->end()
                ->scalarNode('provider')->end()
                ->arrayNode('tables')
                    ->addDefaultsIfNotSet()
                    ->children()
                        ->scalarNode('class')->defaultValue('acl_classes')->end()
                        ->scalarNode('entry')->defaultValue('acl_entries')->end()
                        ->scalarNode('object_identity')->defaultValue('acl_object_identities')->end()
                        ->scalarNode('object_identity_ancestors')->defaultValue('acl_object_identity_ancestors')->end()
                        ->scalarNode('security_identity')->defaultValue('acl_security_identities')->end()
                    ->end()
                ->end()
                ->arrayNode('voter')
                    ->addDefaultsIfNotSet()
                    ->children()
                        ->booleanNode('allow_if_object_identity_unavailable')->defaultTrue()->end()
                    ->end()
                ->end()
            ->end()
        ;

        return $tb;
    }
Generates the configuration tree builder.

@return TreeBuilder The tree builder