Hello, I'm a newbie to Cocoa, just develop some little apps with C/C++ on Windows. I want to make a "simple" app on Cocoa. When the user specific XML file, the file nodes are represented "enduser viewable". I made an interface with some NSTextField. I made a subclass of NSDocument called "XMLFile" so i got "XMLFile.h" and "XMLFile.m" in my Xcode project. In the plist of my app i setup a new "Document Types": XML File - extensions: xml - role: view - class: XMLFile - store type: XML Here is my "XMLFile.h": #import <Cocoa/Cocoa.h> @interface FichierXML : NSDocument { } IBOutlet NSTextField *dateField; IBOutlet NSTextField *titleField; IBOutlet NSTextField *descField; IBOutlet NSTextField *vidfileField; IBOutlet NSTextField *imgfileField; IBOutlet NSObjectController *object; NSUInteger *mask; @end And here is my "XMLFile.m": #import "XMLFile.h" @implementation XMLFile - (BOOL)readFromData:(NSData *)datafile ofType:(NSString *)typeName error:(NSError **)outerror { NSMutableArray* ReportCreationDate = [[NSMutableArray alloc] initWithCapacity:10]; NSMutableArray* ReportTitle = [[NSMutableArray alloc] initWithCapacity:10]; NSMutableArray* ReportDescription = [[NSMutableArray alloc] initWithCapacity:10]; NSMutableArray* VideoPath = [[NSMutableArray alloc] initWithCapacity:10]; NSMutableArray* VideoThumbnailImageName = [[NSMutableArray alloc] initWithCapacity:10]; NSXMLDocument* doc = [[NSXMLDocument alloc] initWithData:datafile options:mask error:outerror]; NSXMLElement* root = [doc rootElement]; NSArray* dateElement = [root nodesForXPath:@"//Report/ReportCreationDate" error:nil]; for(NSXMLElement* xmlElement in dateElement) [dateElement setStringValue:[xmlElement stringValue]]; NSArray* titleElement = [root nodesForXPath:@"//Report/ReportTitle" error:nil]; for(NSXMLElement* xmlElement in titleElement) [titleField setStringValue:[xmlElement stringValue]]; NSArray* descElement = [root nodesForXPath:@"//Report/ReportDescription" error:nil]; for(NSXMLElement* xmlElement in descElement) [descField setStringValue:[xmlElement stringValue]]; NSArray* vidfileElement = [root nodesForXPath:@"//Report/Videos/Video/VideoPath" error:nil]; for(NSXMLElement* xmlElement in vidfileElement) [vidfileField setStringValue:[xmlElement stringValue]]; NSArray* imgfileElement = [root nodesForXPath:@"//Report/Videos/Video/VideoThumbnailImageName" error:nil]; for(NSXMLElement* xmlElement in imgfileElement) [imgfileField setStringValue:[xmlElement stringValue]]; [doc release]; [ReportCreationDate release]; [ReportTitle release]; [ReportDescription release]; [VideoPath release]; [VideoThumbnailImageName release]; return YES; } @end So. The user open the XMLFile, and XMLDocument analyse the file to extract nodes' data and send it to the differents NSTextField... But it doesn't work :( If someone can help me... I'm a newbie so don't be too rude if I made big mistakes :) Miskia.