---
title: kSecTransformActionExternalizeExtraData
framework: security
role: symbol
role_heading: Global Variable
path: security/ksectransformactionexternalizeextradata
---

# kSecTransformActionExternalizeExtraData

An action that triggers after data is stored.

## Declaration

```swift
let kSecTransformActionExternalizeExtraData: CFString
```

## Discussion

Discussion Allows for adding to the data that is stored using an override to the kSecTransformActionExternalizeExtraData block. The output of this override is a dictionary that contains the custom externalized data. A common use of this override is to write out a version number of a custom transform.