This is also a good time to stop and ask whether the frontend/backend protocol needs to change to support this. Not having read the spec, I have no idea what the low-level transport needs are for XML output, but I suspect our present protocol is not it ...
It might be interesting to modify the protocol (and the backend at the point of projection to the front end) so that a user defined formating function could be applied and either accepted or rejected by the front end. Perhaps one flavor of XML output is a start, but I could imagine wanting a custom or even different "standard" output format.
Joe
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