How can I use "embedded-glassfish: admin" to create a data source

There's a lot of artwork pointing to the built-in glass fish: admin, when it comes to creating a data source for the built-in glass fish. But in the end there is a good description of how this should work.

• http://embedded-glassfish.java.net/nonav/plugindocs/3.1/admin-mojo.html
• http://blogs.oracle.com/sirajg/entry/using_maven_plugin_for_v3

anyone successfully used the target "embedded-glassfish: admin" to create a data source, for example. H2 or Oracle? And if so, how do you handle the driver if you do not have a driver container packaged in your WAR?