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# urlForItem(withPersistentIdentifier:)

Returns the URL for a given persistent identifier.

```
func urlForItem(withPersistentIdentifier identifier: NSFileProviderItemIdentifier) -> URL?
```

## Parameters

`identifier`

The persistent identifier for a shared document.

## Return Value

The URL of a shared document.

## Discussion

Override this method to provide the URL for the document with the given identifier. This method must be the inverse of [`persistentIdentifierForItem(at:)`](/documentation/FileProvider/NSFileProviderExtension/persistentIdentifierForItem(at:)), mapping from the persistent identifier, back to the URL.

This URL must be inside the directory referred to by the [`NSFileProviderManager`](/documentation/FileProvider/NSFileProviderManager) object’s [`documentStorageURL`](/documentation/FileProvider/NSFileProviderManager/documentStorageURL) property.

---

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