This protocol, in conjunction with NSValidatedUserInterfaceItem, declares methods that classes implement to provide user interface object validation. This protocol declares the single method validateUserInterfaceItem:, which enables or disables interface objects based on the return value.

@protocol NSUserInterfaceValidations
// Instance Methods
- (BOOL)validateUserInterfaceItem:(id <NSValidatedUserInterfaceItem>)anItem;
@end