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  "identifier" : "/documentation/HealthKit/HKObjectType/documentType(forIdentifier:)",
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# documentType(forIdentifier:)

Returns the shared document type for the provided identifier.

```
class func documentType(forIdentifier identifier: HKDocumentTypeIdentifier) -> HKDocumentType?
```

## Parameters

`identifier`

A document type identifier. For a list of valid identifiers, see [`HKDocumentTypeIdentifier`](/documentation/HealthKit/HKDocumentTypeIdentifier).

## Return Value

The shared [`HKDocumentType`](/documentation/HealthKit/HKDocumentType) instance based on the provided identifier.

## Discussion

This method returns an instance of the [`HKQuantityType`](/documentation/HealthKit/HKQuantityType) concrete subclass. HealthKit uses document types to manage medical documents. Use document type instances to create document samples that you can save in the HealthKit store. For more information, see [`HKDocumentSample`](/documentation/HealthKit/HKDocumentSample).

---

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