Glassfish v3 is going to be based on Maven2, and I've been helping them to get it right. One of the work is to invoke JAXB's schema compiler to compile a DTD with XJC plugins. Once you know what to do, this is easy thanks to the excellent maven-jaxb2-plugin.
As with everything else in Maven, the hard part is to know how to do it. I thought this example might be useful for other folks, so decided to post it here. The crucial portion is the plugin configuration in <build>:
The dependencies section inside the plugin element can be used to specify additional XJC plugins. If you'd like to use more recent version of the JAXB RI, you can specify a dependency to XJC here to do so, like this: