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# init(source:version:productType:operatingSystemVersion:)

Initializes a new source revision object with the provided source, version, product type, and operating system.

```
init(source: HKSource, version: String?, productType: String?, operatingSystemVersion: OperatingSystemVersion)
```

## Parameters

`source`

The source for a sample.

`version`

A string that uniquely identifies the source’s version.

`productType`

A string that identifies the device used to save the sample.

`operatingSystemVersion`

A string that identifies the operating system used to save the sample.

## Return Value

A newly initialized source revision object.

## Discussion

Use this method to create source revisions for use in queries. For more information, see [`HKPredicateKeyPathSourceRevision`](/documentation/HealthKit/HKPredicateKeyPathSourceRevision).

## See Also

[`let HKSourceRevisionAnyVersion: String`](/documentation/HealthKit/HKSourceRevisionAnyVersion)

A constant that matches any version.

[`let HKSourceRevisionAnyProductType: String`](/documentation/HealthKit/HKSourceRevisionAnyProductType)

A constant that matches any product type.

[`let HKSourceRevisionAnyOperatingSystem: OperatingSystemVersion`](/documentation/HealthKit/HKSourceRevisionAnyOperatingSystem)

A constant that matches any operating system.


---

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