cheat sheets.

Cocoa error codes related to validation.

NSManagedObjectValidationError                   = 1550,
NSValidationMultipleErrorsError                  = 1560,
NSValidationMissingMandatoryPropertyError        = 1570,
NSValidationRelationshipLacksMinimumCountError   = 1580,
NSValidationRelationshipExceedsMaximumCountError = 1590,
NSValidationRelationshipDeniedDeleteError        = 1600,
NSValidationNumberTooLargeError                  = 1610,
NSValidationNumberTooSmallError                  = 1620,
NSValidationDateTooLateError                     = 1630,
NSValidationDateTooSoonError                     = 1640,
NSValidationInvalidDateError                     = 1650,
NSValidationStringTooLongError                   = 1660,
NSValidationStringTooShortError                  = 1670,
NSValidationStringPatternMatchingError           = 1680,