Suggestions on maintaining backward compatibility in web services

[Vibhor_Sharma]

Hi 
    We have an existing web services architecture and stable APIs which are 
being used by our customers. We will be rolling out a new release shortly 
(upgrading to Axis2 1.3) and enhancing the web service interfaces. I want to 
know from the experts that are there any best practices of  maintaing the 
backward compatibility? so that we do not upset our customers.
 
Thanks
Vibhor