Can I change the out-put-package from xmlbeans-maven-plugin?

Hello!
(I'm from sweden, feel free to answer in danish.)
Embarrassing, I think I have done this before but now I can not remeber how.

We got system A that communcate with system B with xml in JMS.
The interface-spec is an xsd that we generate the interface classes from.

How ever system B has now updated ths xsd, but uses the same package names like: systemb.version1.XObject, instead of
systemb.VERSION2.XObject.

Since system B is not sure if they need to roll-back we would like to be able to use different versions of the interfaces like in an app.properties-file like:
#message-impl=systemb.version1.XObject
message-impl=systemb.version2.XObject

... Then we easily could shift between the implementations.

Correct me if I'm wrong when I say that I could change the output of the package name with xmlbeans-maven-plugin. So even if the xsd says something in "xmlns:" I can override it?
(We use xmlbeans-maven-plugin 2.3.3 btw.)

If you guys got any info about this please let me know!
Best regards
Fredrik