---
title: HKPredicateKeyPathSource
framework: healthkit
role: symbol
role_heading: Global Variable
path: healthkit/hkpredicatekeypathsource
---

# HKPredicateKeyPathSource

The key path for accessing the object’s source inside a predicate format string.

## Declaration

```swift
let HKPredicateKeyPathSource: String
```

## See Also

### Device and source keys

- [HKPredicateKeyPathDevice](healthkit/hkpredicatekeypathdevice.md)
- [HKPredicateKeyPathSourceRevision](healthkit/hkpredicatekeypathsourcerevision.md)