[Opensource] http request as xml instead of http parameters?

[Mike Traum]

I'm looking to take several of my applications in a different direction -
making them accessible completely through email. 
 
I plan on doing this by writing a gateway-type application - it will read
email, post it to an expresso app, read the response, and send it to the
user. One advantage of MVC is the separation of the View. I figure the
gateway reading an expresso response it somewhat trivial, because the view
can be presented as xml. But, what about the request? Can I easily replace
expresso's requirement of http parameter-based requests in favor of xml?
This is sounding like SOAP, but I know little about it.
 
tia,
mike
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