ah , found it
here is an example :
[service xrx_svc_file]
file_1{
* boolean ServiceEnabled = TRUE;
ref_invocation OutputDocument = XRX_DOCUMENT:doc_1;
string RepositoryName = "11.22.33.44";
string DocumentPath = "/verne";
string UserNetworkFilingLoginName = "scan";
string UserNetworkFilingLoginID = "secret-pc-password-here";
string RepositoryVolume = "";
string NDSNameContext = "";
string NDSTree = "";
enum_namespace FilingNameSpace = UNIX;
enum_filingprotocol FilingProtocol = FTP;
enum_filingpolicy DocumentFilingPolicy = NEW_AUTO_GENERATE;