protected function normalizeRoleIdentifier($roleIdentifier)
    {
        if (strpos($roleIdentifier, ':') === false) {
            $roleIdentifier = 'Neos.Neos:' . $roleIdentifier;
        }
        if (!$this->policyService->hasRole($roleIdentifier)) {
            throw new NoSuchRoleException(sprintf('The role %s does not exist.', $roleIdentifier), 1422540184);
        }

        return $roleIdentifier;
    }