You can install a Datalinq Server locally on the machine where the XML is being generated (if its a PC). And then you can add multiple Datalinq Servers to your XPression Project. You might have better performance and XML file reading reliability if your Datalinq Server can read the file locally and your over network communications are just Datalinq to XPression.
Datalinq Server isn't licensed software, so you can install it anywhere you want and as many times as you want. And you can add as many Datalinq Servers to your XPression project as you need.