Obj-C code

How to find object path:

NSString *xmlPath = [[NSBundle mainBundle] pathForResources:@"config" ofType:@"xml"];

[NSBundle mainBundle] will tell you the path to your project folder. And the search is done in that folder.

What is NSBundle/mainBundle: http://stackoverflow.com/questions/3369136/what-is-nsbundle-and-mainbundle-in-objective-c

How to convert xml into NSString and NSData

    NSString *contents = [NSString stringWithContentsOfFile:xmlPath encoding:NSUTF8StringEncoding error:nil];
    NSLog(@"%@", contents);
    NSData * xmlData = [contents dataUsingEncoding:NSUTF8StringEncoding];

To get the xmlPath, refer to How to find object path

How to access App Delegate

[UIApplication sharedApplication].delegate

http://stackoverflow.com/questions/817259/can-you-access-application-delegate-from-within-a-uitableviewdatasource-function