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# samplePredicates

A dictionary whose keys are [`HKSampleType`](/documentation/HealthKit/HKSampleType) instances and whose values are <doc://com.apple.documentation/documentation/Foundation/NSPredicate> instances.

```
var samplePredicates: [HKSampleType : NSPredicate]? { get }
```

## Discussion

The query uses this dictionary to perform complex tests against the correlation’s contents. For more information, see [`init(type:predicate:samplePredicates:completion:)`](/documentation/HealthKit/HKCorrelationQuery/init(type:predicate:samplePredicates:completion:)).

---

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