Sonata\InvoiceBundle\DependencyInjection\Configuration::addModelSection PHP Method

    private function addModelSection(ArrayNodeDefinition $node)
    {
        $node->children()->arrayNode('class')->addDefaultsIfNotSet()->children()->scalarNode('invoice')->defaultValue('Application\\Sonata\\InvoiceBundle\\Entity\\Invoice')->end()->scalarNode('invoice_element')->defaultValue('Application\\Sonata\\InvoiceBundle\\Entity\\InvoiceElement')->end()->scalarNode('order_element')->defaultValue('Application\\Sonata\\OrderBundle\\Entity\\OrderElement')->end()->scalarNode('customer')->defaultValue('Application\\Sonata\\CustomerBundle\\Entity\\Customer')->end()->end()->end()->end();
    }