Any body knows something about UML and XML pocket reference from O-Reilly. Is that books are sufficient for IBM UML and XML certificate?
Not sure about XML exam, but for 000-486 - Larman is the first source (plus Fowler). You can't pass the test without Larman. Moreover, I believe these books were used by test creators. So, better to concentrate on IBM recommended sources.
One more comment: for 000-486 the UML is important, but not as much as ability to analyse requirements, make design decisions, etc.