Best-practice on versioning a soa suite-application

Hi everyone,
I recently organised a seminar for customers concerning the Soa Suite Stack and one of the interesting questions asked that day was a versioning-question.
Let's say we've build a bpel/esb application interacting with different external and internal webservices and we've deployed this application to our production environment and we need to change an internal web service.
How can we add versioning to this heterogenous system in a consistent way? I know you can tell esb which version of the bpel process it needs to use, but what about the custom and external webservices that we've integrated with?
My 2 cents: You need to add a versioning-tag to you custom web services that you need to manage yourself, and use this versioning tag in the services your integrating with.
Could somebody point me out what best practice is, or what Oracle's development team is working out regarding versioning systems for SOA-applications?

Marc,
Are you saying versioning isn't supported in ESB now? I thought that ESB already uses the versioning tag from bpel when you're integrating bpel and esb?
During the development of my demo I've seen that the version-tag was used when invoking the bpel process through a soa service.

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