I will also have "score" for each Item, but not for the Type. So
the Type and Item entities are not at all the same kind of object.
The Type is a container and the Item is a thing you place in the
container.
[...]
Now, to my question: can I use bindings via NSTreeController? If
so, how do I set up the controller?
You can use NSTreeController for this, but it's hard to say exactly
how to setup everything up because we don't really know enough about
your application.
For instance, you might be better off with just one entity. But maybe
that doesn't fit your data model. I think this is more than can be
answered in a single email.
