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# init(descriptor:)

Returns a new object specifier for an Apple event descriptor.

```
init?(descriptor: NSAppleEventDescriptor)
```

## Parameters

`descriptor`

An Apple event descriptor. The descriptor must have the type `typeObjectSpecifier`.

## Return Value

An object specifier, or `nil` if an error occurs.

## Discussion

If `objectSpecifierWithDescriptor:` is invoked and fails during the execution of a script command, information about the error that caused the failure is recorded in `[NSScriptCommand currentCommand]`.

## See Also

  [Cocoa Scripting Guide](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ScriptableCocoaApplications/SApps_intro/SAppsIntro.html#//apple_ref/doc/uid/TP40002164)


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