XMB.SenderInterfaceNamespace?

I am using a file adapter on my pc and one of the parameters is XMB.SenderInterfaceNamespace=http://xi.sap.com/XI/XIDemo

what should this parameter really be?....as I assume that the xi.sap.com is just a place holder and I have to add a paramter pertinent to my system such as http: /

Thanks

Patrick