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Role of NSTreeController question

I have a situation that can be modeled using entities this way :


	Conference <---------------->> Author <------------>> Report
	       |				       |				|
	Conf Controller			Auth Controller		Report Controller

NSArray controllers are associated with all three Entity types as shown. To provide data to an NSOutlineView, I intend to add an NSTreeController bound to the NSOutlineView.

My question is, am I right in assuming that the NSTreeController then replaces the NSArrayController associated with the Conference Entity? [Conference entities are always at the root level of the NSOutline] Or does the NSTreeController reference elements of the NSArrayController, meaning it needs the array controller for the Conference.

ie like this:

	Conf TreeController
		|
	Conference <---------------->> Author <------------>> Report
	       |				       |				|
	Conf Controller			Auth Controller		Report Controller



or this?:


	Conference <---------------->> Author <------------>> Report
	       |				       |				|
	Conf TreeController		Auth Controller		Report Controller


The intention is to have the NSOutlineView display:

v Conference 1
	v Author 1
		report text
	v Author 2
		report text 2
v Conference 2
	v Author 2
		report text 3

I posted an earlier, vaguer question about hierarchies using NSOutline with NSTreeController. I hope this one will be easier to address.


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