code: public function doConfig(ConfigBuilder $configBuilder){
          $configBuilder->getArray('action')->getValue()->addArray('argument',new ConfigBuilderObject())
              ->getValue()->addString('storage')
              ->addString('name')
              ->addString('pattern','')
              ->addString('validator','')
              ->addString('mapper','')
              ->addString('default','');//FIXME change to addMixedZ
  	}
docs: {@inheritdoc}