No there weren't question on DD and XML . I had the same fear as the book i referred "
EJB 3.0 in action" does not have that great detailed explanation on DD and XML. Just go throught the EJB 3.0 specs. Some important topics like Transaction Management (CMT and BMT), Exception handling need to be referred from the EJB 3.0 spec, also go through the some of the JPA examples in JPA spec. For the remaining part EJB 3.0 in action would be sufficient