Multi-storage Core Data

FROM : Rob Napier
DATE : Sat May 17 18:27:38 2008

I'm trying to build a Core Data app for which some data is user-provided and
some data is shipped with the program. Consider a travel itinerary program
for instance where the user has a trip from airport A to airport B. If the
program includes data about the airports themselves, that shouldn't be
stored in the same storage as the user's flight numbers. One is document
based and the other is shared across documents.

I understand the basic idea of using Fetched Properties and how to create
them. What I'm not clear on is how to define a fetched property in one store
against objects in another store, or how to tie multiple stores together
into a context. Is there a good explanation or sample code for this kind of
setup?

Thanks
-Rob