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# Binding dictionary keys

These constants define keys in the binding information dictionary.

## Topics

### Constants

[`static let observedObject: NSBindingInfoKey`](/documentation/AppKit/NSBindingInfoKey/observedObject)

The object that is the observable controller of the binding.

[`static let observedKeyPath: NSBindingInfoKey`](/documentation/AppKit/NSBindingInfoKey/observedKeyPath)

An `NSString` object containing the key path of the binding.

[`static let options: NSBindingInfoKey`](/documentation/AppKit/NSBindingInfoKey/options)

An `NSDictionary` object containing key value pairs as specified in the options
dictionary when the binding was created.


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