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I made some modifications to the Calculator Combo example and I made a presentation about it focusing on the ability to change among different service implementations/bindings.
You can get the PPT presentation from: http://cwiki.apache.org/confluence/download/attachments/44883/ModifiedCalculatorExample.ppt
Or the PDF version at: http://cwiki.apache.org/confluence/download/attachments/44883/ModifiedCalculatorExample.pdf
Best Regards,
Cristian Fiorentino.