Wondering if anyone has sources that would give me information around how
to iteratively develop my web service without breaking functionality? I
am specificly interested in ideas to solve the problem and industry information
that is available.

e.g. I have a web service that returns result A for United States. Now
I want that service to become global so I want to return result A given
a Locale instead of just returning United States information.

The way that I see it I can create a brand new API (web service) and register
it with the UDDI directory and the client has to be smart enough to go get
the appropriate service.

-- or --

I could add the locale as an optional tag on the request and process appropriately.
If the locale is passed then I return the appropriate information based
on locale or I return United States because that is how my original message