Uses of Package
com.webobjects.foundation

Packages that use com.webobjects.foundation

com.webobjects.appserver	Provides the WebObjects application server, session management classes, component classes, and classes to manage the request-response loop.
com.webobjects.appserver.xml	Provides for encoding and decoding of XML data.
com.webobjects.directtoweb	Provides the framework for rapid development of HTML-based WebObjects applications.
com.webobjects.eoaccess	Provides the data access mechanisms for the Enterprise Objects technology.
com.webobjects.eoapplication	Provides application logic utility classes to the client side of Java Client applications.
com.webobjects.eoapplication.client
com.webobjects.eocontrol	Provides infrastructure for creating and manging enterprise objects.
com.webobjects.eodistribution	Provides the communication mechanism between the client and server components of Java Client applications.
com.webobjects.eodistribution.client	Provides the communication mechanism between the client and server components of Java Client applications.
com.webobjects.eogeneration	Provides infrastructure for dynamically generating complete user interfaces in Java Client applications from XML descriptions of controller hierarchies.
com.webobjects.eogeneration.rules	Provides infrastructure for dynamically generating user interfaces in Java Client applications that use the rule system.
com.webobjects.eointerface	Provides the infrastructure to display data for the control layer in a desktop application's user interface.
com.webobjects.eointerface.cocoa	Provides an implementation of Cocoa-Java classes that plug in to the interface layer.
com.webobjects.eointerface.swing	Provides an implementation of Swing classes that plug in to the interface layer.
com.webobjects.foundation	Provides a set of robust and mature core classes, including utility, collection, key-value coding, time and date, notification, and debug logging classes.
com.webobjects.jdbcadaptor	Provides an implementation of an Enterprise Objects adaptor for JDBC data sources.
com.webobjects.jndiadaptor	Provides an implementation of an Enterprise Objects Frameworks adaptor for JNDI data sources.
com.webobjects.jspservlet	Provides the infrastructure that supports the use of WebObjects API in JavaServlet Pages and the deployment of WebObjects components as Servlets.
com.webobjects.smil	Provides the infrastructure that allows for the development of SMIL (Synchronized Multimedia Integration Language) applications in WebObjects.
com.webobjects.webservices.client	Provides classes that can be used to create a client to consume Web services provided by other applications.
com.webobjects.webservices.generation
com.webobjects.webservices.support.xml	Provides serializers and deserializers for the WebObjects Web services feature.
com.webobjects.woextensions	The WebObjects Extensions are non-synchronizing reusable components defined in the WebObjects Extensions Framework, which is included in every WebObjects Application project.

Classes in com.webobjects.foundation used by com.webobjects.appserver

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSCoder
NSCoder is an abstract class that declares the API used by concrete subclasses to transfer objects and other data items between memory and some other format.

NSData
NSData and its subclass NSMutableData provide data objects, object-oriented wrappers for byte buffers.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSDisposable
The NSDisposable interface declares one method, dispose, in which an object prepares for destruction.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCoding.ErrorHandling
The NSKeyValueCoding.ErrorHandling interface declares an API for handling errors that occur during key-value coding.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

NSMutableDictionary
The NSMutableDictionary class adds methods to insert, modify, and remove elements to the API of its parent class NSDictionary.

NSNotification
NSNotification objects encapsulate information so that it can be broadcast to other objects by an NSNotificationCenter object.

NSNumberFormatter
NSNumberFormatter converts between java.lang.Number and textual representations of numeric values.

NSSelector
An NSSelector object specifies a method signature (a method's name and parameter list).

NSTimestamp
NSTimestamp objects represent a particular instant in time.

NSTimestampFormatter
Instances of NSTimestampFormatter format NSTimestamps into their textual representations and convert textual representations of dates and times into NSTimestamps.

NSUndoManager
NSUndoManager is a general-purpose recorder of operations for undo and redo.

NSValidation
The NSValidation interface defines a validation mechanism in which the properties of an object are validated indirectly by name (or key), rather than directly through invocation of an specific validation method.

NSValidation.ValidationException
Instances of the NSValidation.ValidationException class are created and thrown when an error condition is encountered during the validation of an object that implements NSValidation.

Classes in com.webobjects.foundation used by com.webobjects.appserver.xml

NSData
NSData and its subclass NSMutableData provide data objects, object-oriented wrappers for byte buffers.

NSForwardException
NSForwardException objects (or forwarded exceptions) are wrappers for Throwable objects which are not RuntimeExceptions.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

Classes in com.webobjects.foundation used by com.webobjects.directtoweb

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSBundle
An NSBundle represents a location in the file system that groups code and resources that can be used in a program.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCoding.ErrorHandling
The NSKeyValueCoding.ErrorHandling interface declares an API for handling errors that occur during key-value coding.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

NSMutableDictionary
The NSMutableDictionary class adds methods to insert, modify, and remove elements to the API of its parent class NSDictionary.

NSMutableSet
NSMutableSet provides support for the mathematical concept of a set which, unlike its parent NSSet, may have members added or removed after its creation.

NSNotification
NSNotification objects encapsulate information so that it can be broadcast to other objects by an NSNotificationCenter object.

NSSelector
An NSSelector object specifies a method signature (a method's name and parameter list).

NSValidation
The NSValidation interface defines a validation mechanism in which the properties of an object are validated indirectly by name (or key), rather than directly through invocation of an specific validation method.

NSValidation.ValidationException
Instances of the NSValidation.ValidationException class are created and thrown when an error condition is encountered during the validation of an object that implements NSValidation.

Classes in com.webobjects.foundation used by com.webobjects.eoaccess

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSCoder
NSCoder is an abstract class that declares the API used by concrete subclasses to transfer objects and other data items between memory and some other format.

NSCoding
The NSCoding interface declares the methods that a class must implement so that instances of that class can be encoded and decoded.

NSData
NSData and its subclass NSMutableData provide data objects, object-oriented wrappers for byte buffers.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSDisposable
The NSDisposable interface declares one method, dispose, in which an object prepares for destruction.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSLocking
The NSLocking interface declares the elementary methods adopted by classes that define lock objects.

NSMutableDictionary
The NSMutableDictionary class adds methods to insert, modify, and remove elements to the API of its parent class NSDictionary.

NSMutableSet
NSMutableSet provides support for the mathematical concept of a set which, unlike its parent NSSet, may have members added or removed after its creation.

NSSelector
An NSSelector object specifies a method signature (a method's name and parameter list).

NSTimestamp
NSTimestamp objects represent a particular instant in time.

NSValidation.ValidationException
Instances of the NSValidation.ValidationException class are created and thrown when an error condition is encountered during the validation of an object that implements NSValidation.

Classes in com.webobjects.foundation used by com.webobjects.eoapplication

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSDisposable
The NSDisposable interface declares one method, dispose, in which an object prepares for destruction.

NSDisposableRegistry
A NSDisposableRegistry object is a registry of NSDisposable objects that should be disposed when the registry is disposed.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCoding.ErrorHandling
The NSKeyValueCoding.ErrorHandling interface declares an API for handling errors that occur during key-value coding.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

NSNotification
NSNotification objects encapsulate information so that it can be broadcast to other objects by an NSNotificationCenter object.

Classes in com.webobjects.foundation used by com.webobjects.eoapplication.client

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSDisposable
The NSDisposable interface declares one method, dispose, in which an object prepares for destruction.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCoding.ErrorHandling
The NSKeyValueCoding.ErrorHandling interface declares an API for handling errors that occur during key-value coding.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

Classes in com.webobjects.foundation used by com.webobjects.eocontrol

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSCoder
NSCoder is an abstract class that declares the API used by concrete subclasses to transfer objects and other data items between memory and some other format.

NSCoding
The NSCoding interface declares the methods that a class must implement so that instances of that class can be encoded and decoded.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSDisposable
The NSDisposable interface declares one method, dispose, in which an object prepares for destruction.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCoding.ErrorHandling
The NSKeyValueCoding.ErrorHandling interface declares an API for handling errors that occur during key-value coding.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

NSLocking
The NSLocking interface declares the elementary methods adopted by classes that define lock objects.

NSMutableArray
The NSMutableArray class provides facilities for managing a mutable collection of objects.

NSMutableSet
NSMutableSet provides support for the mathematical concept of a set which, unlike its parent NSSet, may have members added or removed after its creation.

NSSelector
An NSSelector object specifies a method signature (a method's name and parameter list).

NSSet
NSSet declares an API for an object that manages a collection of objects similar to a mathematical set.

NSTimestamp
NSTimestamp objects represent a particular instant in time.

NSUndoManager
NSUndoManager is a general-purpose recorder of operations for undo and redo.

NSValidation
The NSValidation interface defines a validation mechanism in which the properties of an object are validated indirectly by name (or key), rather than directly through invocation of an specific validation method.

NSValidation.ValidationException
Instances of the NSValidation.ValidationException class are created and thrown when an error condition is encountered during the validation of an object that implements NSValidation.

Classes in com.webobjects.foundation used by com.webobjects.eodistribution

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSData
NSData and its subclass NSMutableData provide data objects, object-oriented wrappers for byte buffers.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSDisposable
The NSDisposable interface declares one method, dispose, in which an object prepares for destruction.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCoding.ErrorHandling
The NSKeyValueCoding.ErrorHandling interface declares an API for handling errors that occur during key-value coding.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

NSSelector
An NSSelector object specifies a method signature (a method's name and parameter list).

NSValidation
The NSValidation interface defines a validation mechanism in which the properties of an object are validated indirectly by name (or key), rather than directly through invocation of an specific validation method.

Classes in com.webobjects.foundation used by com.webobjects.eodistribution.client

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSCoder
NSCoder is an abstract class that declares the API used by concrete subclasses to transfer objects and other data items between memory and some other format.

NSCoding
The NSCoding interface declares the methods that a class must implement so that instances of that class can be encoded and decoded.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSDisposable
The NSDisposable interface declares one method, dispose, in which an object prepares for destruction.

NSLocking
The NSLocking interface declares the elementary methods adopted by classes that define lock objects.

NSValidation.ValidationException
Instances of the NSValidation.ValidationException class are created and thrown when an error condition is encountered during the validation of an object that implements NSValidation.

Classes in com.webobjects.foundation used by com.webobjects.eogeneration

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSDisposable
The NSDisposable interface declares one method, dispose, in which an object prepares for destruction.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCoding.ErrorHandling
The NSKeyValueCoding.ErrorHandling interface declares an API for handling errors that occur during key-value coding.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

Classes in com.webobjects.foundation used by com.webobjects.eogeneration.rules

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCoding.ErrorHandling
The NSKeyValueCoding.ErrorHandling interface declares an API for handling errors that occur during key-value coding.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

NSValidation
The NSValidation interface defines a validation mechanism in which the properties of an object are validated indirectly by name (or key), rather than directly through invocation of an specific validation method.

Classes in com.webobjects.foundation used by com.webobjects.eointerface

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSDisposable
The NSDisposable interface declares one method, dispose, in which an object prepares for destruction.

NSNotification
NSNotification objects encapsulate information so that it can be broadcast to other objects by an NSNotificationCenter object.

NSSelector
An NSSelector object specifies a method signature (a method's name and parameter list).

NSUndoManager
NSUndoManager is a general-purpose recorder of operations for undo and redo.

Classes in com.webobjects.foundation used by com.webobjects.eointerface.cocoa

NSDisposable
The NSDisposable interface declares one method, dispose, in which an object prepares for destruction.

NSTimestamp
NSTimestamp objects represent a particular instant in time.

Classes in com.webobjects.foundation used by com.webobjects.eointerface.swing

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSData
NSData and its subclass NSMutableData provide data objects, object-oriented wrappers for byte buffers.

NSDisposable
The NSDisposable interface declares one method, dispose, in which an object prepares for destruction.

Classes in com.webobjects.foundation used by com.webobjects.foundation

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSArray.Operator
Objects implementing NSArray.Operator are used to perform operations on an array's elements.

NSBundle
An NSBundle represents a location in the file system that groups code and resources that can be used in a program.

NSCoder
NSCoder is an abstract class that declares the API used by concrete subclasses to transfer objects and other data items between memory and some other format.

NSCoding
The NSCoding interface declares the methods that a class must implement so that instances of that class can be encoded and decoded.

NSCoding.Support
NSCoding.Support is an abstract class that defines a mechanism for one class to provide NSCoding behavior on behalf of another class.

NSComparator
NSComparator is an abstract class that defines an API for comparing two objects for the purpose of sorting them.

NSComparator.ComparisonException
Instances of the NSComparator.ComparisonException class are created and thrown when an error condition is encountered during the comparison of two objects.

NSData
NSData and its subclass NSMutableData provide data objects, object-oriented wrappers for byte buffers.

NSDelayedCallbackCenter
An NSDelayedCallbackCenter object (also called a delayed callback center) provides a way to guarantee that particular methods are invoked after an event has ended.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSDisposable
The NSDisposable interface declares one method, dispose, in which an object prepares for destruction.

NSDisposableRegistry
A NSDisposableRegistry object is a registry of NSDisposable objects that should be disposed when the registry is disposed.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCoding.Null
NSKeyValueCoding.Null is a final class that defines a unique object used to represent null values in collection objects, such as NSArrays, which do not allow null values.

NSKeyValueCoding.ValueAccessor
NSKeyValueCoding.ValueAccessor is an abstract class that establishes a mechanism by which NSKeyValueCoding can operate on object's package access instance variables.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

NSLocking
The NSLocking interface declares the elementary methods adopted by classes that define lock objects.

NSLog.Logger
NSLog.Logger is an abstract class that specifies the core functionality for NSLog.

NSMutableArray
The NSMutableArray class provides facilities for managing a mutable collection of objects.

NSMutableDictionary
The NSMutableDictionary class adds methods to insert, modify, and remove elements to the API of its parent class NSDictionary.

NSMutableRange
An NSMutableRange is an object representing a range that can be changed.

NSMutableSet
NSMutableSet provides support for the mathematical concept of a set which, unlike its parent NSSet, may have members added or removed after its creation.

NSNotification
NSNotification objects encapsulate information so that it can be broadcast to other objects by an NSNotificationCenter object.

NSNotificationCenter
An NSNotificationCenter object (or simply, notification center) is essentially a notification dispatch table.

NSRange
An NSRange represents a range, a measurement of a segment of something linear, such as a byte stream.

NSSelector
An NSSelector object specifies a method signature (a method's name and parameter list).

NSSet
NSSet declares an API for an object that manages a collection of objects similar to a mathematical set.

NSTimestamp
NSTimestamp objects represent a particular instant in time.

NSTimestamp.IntRef
Deprecated. in the Java Foundation framework. NSTimestamp.IntRef objects act as a containers to hold the values returned by NSTimestamp's gregorianUnitsSinceTimestamp method and consist solely of an instance variable, value.

NSTimeZone
NSTimeZone defines the behavior of time zones for different geopolitical regions.

NSValidation.ValidationException
Instances of the NSValidation.ValidationException class are created and thrown when an error condition is encountered during the validation of an object that implements NSValidation.

Classes in com.webobjects.foundation used by com.webobjects.jdbcadaptor

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSMutableDictionary
The NSMutableDictionary class adds methods to insert, modify, and remove elements to the API of its parent class NSDictionary.

Classes in com.webobjects.foundation used by com.webobjects.jndiadaptor

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSMutableDictionary
The NSMutableDictionary class adds methods to insert, modify, and remove elements to the API of its parent class NSDictionary.

Classes in com.webobjects.foundation used by com.webobjects.jspservlet

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCoding.ErrorHandling
The NSKeyValueCoding.ErrorHandling interface declares an API for handling errors that occur during key-value coding.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

Classes in com.webobjects.foundation used by com.webobjects.smil

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSData
NSData and its subclass NSMutableData provide data objects, object-oriented wrappers for byte buffers.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCoding.ErrorHandling
The NSKeyValueCoding.ErrorHandling interface declares an API for handling errors that occur during key-value coding.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

NSValidation
The NSValidation interface defines a validation mechanism in which the properties of an object are validated indirectly by name (or key), rather than directly through invocation of an specific validation method.

Classes in com.webobjects.foundation used by com.webobjects.webservices.client

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSMutableArray
The NSMutableArray class provides facilities for managing a mutable collection of objects.

NSMutableDictionary
The NSMutableDictionary class adds methods to insert, modify, and remove elements to the API of its parent class NSDictionary.

Classes in com.webobjects.foundation used by com.webobjects.webservices.generation

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCoding.ErrorHandling
The NSKeyValueCoding.ErrorHandling interface declares an API for handling errors that occur during key-value coding.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

NSValidation
The NSValidation interface defines a validation mechanism in which the properties of an object are validated indirectly by name (or key), rather than directly through invocation of an specific validation method.

Classes in com.webobjects.foundation used by com.webobjects.webservices.support.xml

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

Classes in com.webobjects.foundation used by com.webobjects.woextensions

NSArray
NSArray and its subclass NSMutableArray manage ordered collections of objects.

NSDictionary
The NSDictionary class declares an API for objects that manage immutable associations of keys and values.

NSKeyValueCoding
The NSKeyValueCoding interface defines a data transport mechanism in which the properties of an object are accessed indirectly by name (or key), rather than directly through invocation of an accessor method or as instance variables.

NSKeyValueCoding.ErrorHandling
The NSKeyValueCoding.ErrorHandling interface declares an API for handling errors that occur during key-value coding.

NSKeyValueCodingAdditions
The NSKeyValueCodingAdditions interface defines an extension to the basic NSKeyValueCoding interface.

NSMutableArray
The NSMutableArray class provides facilities for managing a mutable collection of objects.

NSMutableDictionary
The NSMutableDictionary class adds methods to insert, modify, and remove elements to the API of its parent class NSDictionary.

NSTimestamp
NSTimestamp objects represent a particular instant in time.

NSValidation
The NSValidation interface defines a validation mechanism in which the properties of an object are validated indirectly by name (or key), rather than directly through invocation of an specific validation method.