OpenEJB 3.0 can be plugged into Tomcat 6 server, adding support for EJBs in Web Apps. Adding OpenEJB to Tomcat gives Servlets new Java EE 5 capabilities such as JPA, JAX-WS, JMS, J2EE Connectors ...

This is the OpenEJB-specific descriptor. If you’ve previously used older versions of OpenEJB, you are probably familiar with this file. Only the namespace declaration differs.