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# Store versions

The metadata keys you use when comparing store versions.

## Topics

### Constants

[`let NSStoreModelVersionHashesKey: String`](/documentation/CoreData/NSStoreModelVersionHashesKey)

Key to represent the version hash information for the model used to create the store.

[`let NSStoreModelVersionIdentifiersKey: String`](/documentation/CoreData/NSStoreModelVersionIdentifiersKey)

Key to represent the version identifiers for the model used to create the store.

[`let NSPersistentStoreOSCompatibility: String`](/documentation/CoreData/NSPersistentStoreOSCompatibility)

Key to represent the earliest version of the operation system that the persistent store supports.


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