---
title: versionIdentifiers
framework: coredata
role: symbol
role_heading: Instance Property
path: coredata/nsmanagedobjectmodel/versionidentifiers
---

# versionIdentifiers

The set of developer-defined version identifiers for the object model.

## Declaration

```swift
var versionIdentifiers: Set<AnyHashable> { get set }
```

## Discussion

Discussion Merged models return the combined collection of identifiers. The Core Data framework does not assign a default identifier to object models, nor does it depend on this value at runtime. For models you create in Xcode, set this value in the model inspector. Use this value when debugging to help determine the models that Core Data merges to create the merged model.

## See Also

### Versioning and migrating entities

- [versionChecksum](coredata/nsmanagedobjectmodel/versionchecksum.md)
- [entityVersionHashesByName](coredata/nsmanagedobjectmodel/entityversionhashesbyname.md)
- [isConfiguration(withName:compatibleWithStoreMetadata:)](coredata/nsmanagedobjectmodel/isconfiguration(withname:compatiblewithstoremetadata:).md)