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

Question

I think xcode 3 use the latter and xcode 4 use the former.

Are they interchangeable?

Answer 1

.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.