On Dec 5, 2016, at 4:18 PM, Daryle Walker <dary...@mac.com> wrote:

> I've heard that Core Data is a object graph and persistence library. What if 
> you want just the first part?  The graph seems like a neat way to save on 
> modeling code, the external format is not database-ish at all (so the 
> capability for custom export formats won't help). Can I just not use the 
> persistence part and use custom save & load functions? Or do I have to (or 
> should) give up on Core Data?

This is exactly the sort of thing that subclassing NSAtomicStore 
<https://developer.apple.com/reference/coredata/nsatomicstore> lets you do.

There are only a few methods to override, and then you can just use one of your 
own documents as if it were one of the built-in persistent store types.

  -- Chris

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