1. XML
1.1. NSXMLNode
1.1.1. NSXMLDocument
1.1.2. NSXMLDTD
1.1.3. NSXMLDTDNode
1.1.4. NSXMLElement
1.2. NSXMLParser
2. Collections
2.1. NSArray
2.1.1. NSMutableArray
2.2. NSDictionary
2.2.1. NSMutableDictionary
2.3. NSEnumerator
2.3.1. NSDirectoryEnumerator
2.4. NSHashTable
2.5. NSIndexPath
2.6. NSIndexSet
2.6.1. NSMutableIndexSet
2.7. NSMapTable
2.8. NSPointerArray
2.9. NSPointerFunstions
2.10. NSSet
2.10.1. NSMutableSet
2.10.1.1. NSCountedSet
3. OS Services
3.1. NSError
3.2. NSHost
3.3. NSNetService
3.4. NSNetServiceBrowser
3.5. NSOrthography
3.6. NSProcessInfo
3.7. NSRunLoop
3.8. NSSpellServer
3.9. NSTextCheckingResult
3.10. NSTimer
3.11. NSUserDefaults
3.12. File System
3.12.1. NSBundle
3.12.2. NSFileHandle
3.12.3. NSFileManager
3.12.4. NSMetadataItem
3.12.5. NSMetadataQuery
3.12.6. NSMetadateQueryAttributeValueTuple
3.12.7. NSMetadataQueryResultGroup
3.12.8. NSStream
3.12.8.1. NSInputStream
3.12.8.2. NSOutputStream
3.13. URL
3.13.1. NSCachedURLResponse
3.13.2. NSHTTPCookie
3.13.3. NSHTTPCookieStorage
3.13.4. NSURL
3.13.5. NSURLAuthorizationChallenge
3.13.6. NSURLCache
3.13.7. NSURLConnection
3.13.8. NSURLCredential
3.13.9. NSURLCredentialStorage
3.13.10. NSURLDownload
3.13.11. NSURLProtectionSpace
3.13.12. NSURLProtocol
3.13.13. NSURLRequest
3.13.13.1. NSMutableURLRequest
3.13.14. NSURLResponse
3.13.14.1. NSHTTLURLResponse
3.14. Interprocess Communication
3.14.1. NSPipe
3.14.2. NSPort
3.14.2.1. NSMessagePort
3.14.2.2. NSSocketPort
3.14.3. NSPortMessage
3.14.4. NSPortNameServer
3.14.4.1. NSMachBootstrapServer
3.14.4.2. NSMessagePortNameServer
3.14.4.3. NSScoketPortNameServer
3.15. Locking/Threading
3.15.1. NSConditionalLock
3.15.2. NSDistributedLock
3.15.3. NSLock
3.15.4. NSOperation
3.15.4.1. NSBlockOperation
3.15.4.2. NSInvocationOperation
3.15.5. NSOperationQueue
3.15.6. NSRecursiveLock
3.15.7. NSTask
3.15.8. NSThread
4. Archiving and Serialization
4.1. NSCoder
4.1.1. NSArchiver
4.1.2. NSKeyedArchiver
4.1.3. NSKeyedUnarchiver
4.1.4. NSPortCoder
4.1.5. NSUnarchiver
4.2. NSPropertyListSerialization
5. Objective-C Language Services
5.1. NSAssertionHandler
5.2. NSAutoreleasePool
5.3. NSClassDescription
5.4. NSException
5.5. NSCarbageCollector
5.6. NSInvocation
5.7. NSMethodSignature
5.8. NSUndoManager
6. Protocols
6.1. NSCoding
6.2. NSComparisonMethods
6.3. NSConnectionDelegate
6.4. NSCopying
6.5. NSDecimalNumberBehaviors
6.6. NSErrorRecoveryAttempting
6.7. NSFastEnumeration
6.8. NSKeyedArchiverDelegate
6.9. NSKeyedUnarchiverDelegate
6.10. NSKeyValueCoding
6.11. NSKeyValueObserving
6.12. NSLocking
6.13. NSMachPortDelegate
6.14. NSMetadataQueryDelegate
6.15. NSMutableCopying
6.16. NSNetServiceBrowserDelegate
6.17. NSNetServiceDelegate
6.18. NSObjCTypeSelializationCallBack
6.19. NSObject
6.20. NSPortDelegate
6.21. NSScriptingComparisonMethods
6.22. NSScriptKeyValuaCoding
6.23. NSScriptObjectSpecifiers
6.24. NSSpellServerDelegate
6.25. NSStreamDelegate
6.26. NSURLAuthenticationChallengeSender
6.27. NSURLHandleClient
6.28. NSURLProtocolClient
6.29. NSXMLParserDelegate
7. Value Objects
7.1. NSAffineTransform
7.2. NSCalendar
7.3. NSCache
7.4. NSData
7.4.1. NSMutableDate
7.4.1.1. NSPurgableData
7.5. NSDate
7.5.1. NSCalendarDate
7.6. NSDateComponents
7.7. NSDecimalNumberHandler
7.8. NSLocale
7.9. NSNull
7.10. NSTimeZone
7.11. NSValue
7.11.1. NSNumber
7.11.1.1. NSDecimalNumber
7.12. NSValueTransformer
8. Strings
8.1. NSAttributedString
8.1.1. NSMutableAttributedString
8.2. NSCharacterSet
8.2.1. NSMutableCharacterSet
8.3. NSString
8.3.1. NSMutableString
8.4. NSFormatter
8.4.1. NSDateFormatter
8.4.2. NSNumberFormatter
8.5. NSScanner
8.6. NSSortDescriptor
9. Predicates
9.1. NSExpression
9.2. NSPredicate
9.2.1. NSComparisonPredicate
9.2.2. NSCompundPredicate
10. Notifications
10.1. NSNotification
10.2. NSNotificationCenter
10.2.1. NSDistributedNotificationCenter
10.3. NSNotificationQueue
11. Scripting
11.1. NSScriptClassDescription : NSClassDescription
11.2. NSAppleEventDescriptor
11.3. NSAppleEventManager
11.4. NSAppleScript
11.5. NSPositionalSpecifier
11.6. NSScriptCoercionHandler
11.7. NSScriptCommand
11.7.1. NSCloneCommand
11.7.2. NSCloseCommand
11.7.3. NSCountCommand
11.7.4. NSCreateCommand
11.7.5. NSDeleteCommand
11.7.6. NSExistsCommand
11.7.7. NSGetCommand
11.7.8. NSMoveCommand
11.7.9. NSQuitCommand
11.7.10. NSSetCommand
11.8. NSScriptCommandDescription
11.9. NSScriptExecutionContext
11.10. NSScriptObjectSpecifier
11.10.1. NSIndexSpecifier
11.10.2. NSMiddleSpecifier
11.10.3. NSNameSpecifier
11.10.4. NSPropertySpecifier
11.10.5. NSRandomSpecifier
11.10.6. NSRangeSpecifier
11.10.7. NSRelativeSpecifier
11.10.8. NSUniqueIDSpecifier
11.10.9. NSWhoseSpecifier