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