This informal protocol declares two methods that classes implement to support scriptability. The two methods are objectSpecifier and indicesOfObjectsBy-EvaluatingObjectSpecifier:. The objectSpecifier method, when implemented, should return an instance of NSObjectSpecifier, while the second method listed below is implemented by container objects to return an NSArray of NSNumbers indicating the indices of objects within the container that match the specifier indicated in the argument. See the class description of NSScriptObjectSpecifier in Chapter 13 for more information.

@interface NSObject (NSScriptObjectSpecifiers)
// Instance Methods
- (NSScriptObjectSpecifier *)objectSpecifier;
- (NSArray *)indicesOfObjectsByEvaluatingObjectSpecifier:(NSScriptObjectSpecifier *)specifier;
@end