Maven javadoc selective submodules

Hi,

How do you generate a combined javadoc for a selection of submodules?

I have added the javadoc plugin with the aggregate goal to the build as
specified in
http://maven.apache.org/plugins/maven-javadoc-plugin/examples/aggregate.html
but it not generates javadocs for all submodules. I want to be more
selective.

I have tried to set the dependencySourceIncludes or dependencySourceExcludes
in the configuration, but it doesn't seem to have any effect.

I tried to look at the report sets, but I don't seem to be able to find any
configuration documentation about them.