Overridden by subclasses to determine whether it's permissible to delete object. EOClassDescription's implementation of this method completes normally. Overridden by subclasses to determine whether the values being saved for object are acceptable. EOClassDescription's implementation of this method completes normally. Overridden by subclasses to validate value.
Implementations can replace value by returning a new value.
EOClassDescription's implementation of this method returns null. An enterprise object performs custom attribute specific validation with a method of the form validate Key . See the EOValidation interface specification for more information. The following notifications are declared by EOClassDescription and posted by enterprise objects in your application. The observer then locates the appropriate class description and registers it in the application.