<font size="2" face="Verdana, Geneva, Arial, Helvetica, sans-serif">This blog entry by John Ward shows how to create a custom emitter for BIRT. For this example, he creates a custom XML emitter using JaxB and provides instructions for creating, configuring, and deploying the emitter plug-in.</font>
http://digiassn.blogspot.com/2007/08/birt-writing-emitter.html