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Binding NSArrayController to 2 NSArrayCOntroller selection

Hi folks.
This is Davide Benini, from Verona, Italy; I am a PhD student in literature, and I am trying to build a bibliographic app.

I am building an iTunes-like browser for passages from the catalogued books.
I have 3 columns (topic, author, text) and a list of passages, just
like the iTunes model.
Here's a pic:
http://www.cnomania.it/garage/browser.jpg
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 _______________________________________________
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