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I am building an iTunes-like browser for my biblographic app. I have 3 columns (topic, author, text) and a list of passages, just like the iTunes model.

Now, I have managed to sort the Authors column according to the selction in the Topics colums, by binding the contentSet of the authorsBrowser to the topics relationship. The thing is,now, I must restrict the content of the 3rd controller (texts) taking into account the selection of BOTH preceding column; ideally, I should bind the content set to the ‘entries’ relationship of BOTH the topic controller AND the authors controller. This cannot be done through the contentSet binding. Should I bind to some filterPredicate? Which one? Any suggestion is welcome. Cheers, Davide