What's the difference between .xcdatamodeld and BadgerNew.xcdatamodel

I think xcode 3 use the latte开发者_如何学运维r and xcode 4 use the former.

Are they interchangeable?

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.xcdatamodeld is a container for .xcdatamodel files. It's used for versioning and migration. When moving from v1 of the model to v2, you add a new xcdatamodel to it that has v2 along with the mapping model.