def ref(self) -> RefRequestBuilder:
        """
        Provides operations to manage the collection of identityContainer entities.
        """
        from .ref.ref_request_builder import RefRequestBuilder

        return RefRequestBuilder(self.request_adapter, self.path_parameters)

        Provides operations to manage the collection of identityContainer entities.
        
msgraph/generated/identity/authentication_events_flows/item/graph_external_users_self_service_sign_up_events_flow/on_attribute_collection/graph_on_attribute_collection_external_users_self_service_sign_up/attributes/item/identity_user_flow_attribute_item_request_builder.py