This class is one of three that comprise Cocoa's document-based application architecture; the other two are NSDocumentController and NSWindowController. NSDocument is an abstract class that defines the fundamental interface for objects that represent documents. This interface includes methods for loading and saving a document's contents, managing a document's windows, handling print jobs, and managing an undo manager. NSDocument is never used directly; rather, developers subclass NSDocument and implement the key methods to tailor the document to their needs.

@interface NSDocument : NSObject
// Initializers
- (id)init;
- (id)initWithContentsOfFile:(NSString *)fileName ofType:(NSString *)fileType;
- (id)initWithContentsOfURL:(NSURL *)url ofType:(NSString *)fileType;
// Accessor Methods
- (void)setHasUndoManager:(BOOL)flag;
- (BOOL)hasUndoManager;
- (void)setFileType:(NSString *)type;
- (NSString *)fileType;
- (void)setFileName:(NSString *)fileName;
- (NSString *)fileName;
- (void)setUndoManager:(NSUndoManager *)undoManager;
- (NSUndoManager *)undoManager;
- (void)setPrintInfo:(NSPrintInfo *)printInfo;
- (NSPrintInfo *)printInfo;
- (void)setWindow:(NSWindow *)window;
// Class Methods
+ (BOOL)isNativeType:(NSString *)type;
+ (NSArray *)readableTypes;
+ (NSArray *)writableTypes;
// Instance Methods
- (NSData *)dataRepresentationOfType:(NSString *)type;
- (NSString *)displayName;
- (void)addWindowController:(NSWindowController *)windowController;
- (BOOL)canCloseDocument;
- (NSDictionary *)fileAttributesToWriteToFile:(NSString *)fullDocumentPath ofType:(NSString *)documentTypeName saveOperation:(NSSaveOperationType)saveOperationType;
- (void)canCloseDocumentWithDelegate:(id)delegate shouldCloseSelector:(SEL)shouldCloseSelector contextInfo:(void *)contextInfo;
- (void)close;
- (BOOL)fileNameExtensionWasHiddenInLastRunSavePanel;
- (NSString *)fileNameFromRunningSavePanelForSaveOperation:(NSSaveOperationType)saveOperation;
- (NSString *)fileTypeFromLastRunSavePanel;
- (NSFileWrapper *)fileWrapperRepresentationOfType:(NSString *)type;
- (BOOL)isDocumentEdited;
- (BOOL)keepBackupFile;
- (BOOL)loadDataRepresentation:(NSData *)data ofType:(NSString *)type;
- (BOOL)loadFileWrapperRepresentation:(NSFileWrapper *)wrapper ofType:(NSString *)type;
- (void)makeWindowControllers;
- (BOOL)preparePageLayout:(NSPageLayout *)pageLayout;
- (BOOL)prepareSavePanel:(NSSavePanel *)savePanel;
- (IBAction)printDocument:(id)sender;
- (void)printShowingPrintPanel:(BOOL)flag;
- (BOOL)readFromFile:(NSString *)fileName ofType:(NSString *)type;
- (BOOL)readFromURL:(NSURL *)url ofType:(NSString *)type;
- (void)removeWindowController:(NSWindowController *)windowController;
- (IBAction)revertDocumentToSaved:(id)sender;
- (BOOL)revertToSavedFromFile:(NSString *)fileName ofType:(NSString *)type;
- (BOOL)revertToSavedFromURL:(NSURL *)url ofType:(NSString *)type;
- (int)runModalPageLayoutWithPrintInfo:(NSPrintInfo *)printInfo;
- (void)runModalPageLayoutWithPrintInfo:(NSPrintInfo *)printInfo delegate:(id)delegate didRunSelector:(SEL)didRunSelector contextInfo:(void *)contextInfo;
- (void)runModalPrintOperation:(NSPrintOperation *)printOperation delegate:(id)delegate didRunSelector:(SEL)didRunSelector contextInfo:(void *)contextInfo;
- (int)runModalSavePanel:(NSSavePanel *)savePanel withAccessoryView:(NSView *)accessoryView;
- (void)runModalSavePanelForSaveOperation:(NSSaveOperationType)saveOperation delegate:(id)delegate didSaveSelector:(SEL)didSaveSelector contextInfo:(void *)contextInfo;
- (IBAction)runPageLayout:(id)sender;
- (IBAction)saveDocument:(id)sender;
- (IBAction)saveDocumentAs:(id)sender;
- (IBAction)saveDocumentTo:(id)sender;
- (void)saveDocumentWithDelegate:(id)delegate didSaveSelector:(SEL)didSaveSelector contextInfo:(void *)contextInfo;
- (void)saveToFile:(NSString *)fileName saveOperation:(NSSaveOperationType)saveOperation delegate:(id)delegate didSaveSelector:(SEL)didSaveSelector contextInfo:(void *)contextInfo;
- (BOOL)shouldChangePrintInfo:(NSPrintInfo *)newPrintInfo;
- (BOOL)shouldCloseWindowController:(NSWindowController *)windowController;
- (void)shouldCloseWindowController:(NSWindowController *)windowController delegate:(id)delegate shouldCloseSelector:(SEL)callback contextInfo:(void *)contextInfo;
- (BOOL)shouldRunSavePanelWithAccessoryView;
- (void)showWindows;
- (void)updateChangeCount:(NSDocumentChangeType)change;
- (BOOL)validateMenuItem:(NSMenuItem *)anItem;
- (BOOL)validateUserInterfaceItem:(id <NSValidatedUserInterfaceItem>)anItem;
- (void)windowControllerDidLoadNib:(NSWindowController *)windowController;
- (void)windowControllerWillLoadNib:(NSWindowController *)windowController;
- (NSArray *)windowControllers;
- (NSString *)windowNibName;
- (BOOL)writeToFile:(NSString *)fileName ofType:(NSString *)type;
- (BOOL)writeToFile:(NSString *)fullDocumentPath ofType:(NSString *)documentTypeName originalFile:(NSString *)fullOriginalDocumentPath saveOperation:(NSSaveOperationType)saveOperationType;
- (BOOL)writeToURL:(NSURL *)url ofType:(NSString *)type;
- (BOOL)writeWithBackupToFile:(NSString *)fullDocumentPath ofType:(NSString *)documentTypeName saveOperation:(NSSaveOperationType)saveOperationType;