public function deleteMulti(array $arr_entities)
    {
        $obj_mapper = $this->createMapper();
        $obj_request = $this->setupCommit();
        $obj_mutation = $obj_request->mutableDeprecatedMutation();
        foreach($arr_entities as $obj_gds_entity) {
            $this->applyNamespace(
                $obj_mapper->configureGoogleKey(
                    $obj_mutation->addDelete(), $obj_gds_entity
                )
            );
        }
        $this->execute('Commit', $obj_request, new CommitResponse());
        $this->obj_schema = null;
        return TRUE; // really?
    }