How to get URL for application's document directory iPhone

This code is a part of Core Data. The URLsForDirectory....method does not run on iOS < 4 so I need to know some other methods/objects to call. I would also appriciate documentation for future reference. Thank you

/**
 Returns the URL to the application's Documents directory.
*/
- (NSURL *)applicationDocumentsDirectory
{
    return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
}

You can get the document path via the NSSearchPathForDirectoriesInDomains foundation function as follows:

NSArray *searchPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentPath = [searchPaths objectAtIndex:0];

This will work on iOS 2+.