Generating partial schemas

Folks,

I'm having a bit of trouble generating only a limited set of stub 
classes for a set of schemas.

I'm creating a new add-on for an existing xmlbeans-based project. This 
add-on comes with its own xml schema in its own namespace that extends 
data types from the main project. To this end, the add-on xsd imports 
the main schema.

Now the thing is that I want the add-on project to generate xmlbeans 
stubs for the new elements only. However, because the add-on schema 
imports the main schema, xmlbeans decides to compile stubs for the main 
schema as well.

Is it possible to tell xmlbeans to only compile stubs for the elements 
in a specific schema and to ignore elements declared in imported and 
included schemas?

Ultimately I want to add the generated stubs of the new project to the 
classpath as an "add-on" or "plug-in" to the main project, so the stubs 
of both projects need to be compatible.

regards,
Erik van Zijst