I found a contradiction in the spec. (well, I think it is...)
Page 47 of the spec (ejb-persistence) describes that a getTransaction() of the EntityManager returns a resource-level transaction object. At the bottom of the same page it again says that getTransaction() is used to manage application-managed entity mangers.
Isn't this a contradiction because application-managed entity managers use JTA which is different from resource-level entity managers ???