UUID means Universally unique identifier and it must be unique: 
https://en.wikipedia.org/wiki/UUID <https://en.wikipedia.org/wiki/UUID>

To generate an UUID, use a standard system function (CFUUID, NSUUID, libuuid, …)


> Le 10 janv. 2017 à 11:36, Daryle Walker <dary...@mac.com> a écrit :
> 
> Been reading up on NSIncrementalStore, including its guide. I think I grok it 
> more now. When initializing an instance, you're supposed to submit an UUID. 
> Can a single value be used for all instances, or is it supposed to unique per 
> instance?  If the latter, and the source data doesn't already have a UUID 
> field, do you to take heroic measures to ensure uniqueness? Or is a casual 
> effort enough?
> 
> Sent from my iPhone
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