sharing_data_between_Classes

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//yourAppDelegate.h
@interface yourAppDelegate : UIResponder <UIApplicationDelegate>
//i assume you want to share a string
@property (copy, readwrite) NSString  *sharedString;
@end
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//yourAppDelegate.m
@synthesize sharedString;
...
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classA.m(the source where you get the string data from xml)
//on the top of file import your appDelegate class
#import "YourAppDelegate.h"
.
.
//navigate to the place(place) you want to share data, i assume you do that in viewDidLoad
- (void)viewDidLoad
{
.
.
.
//your other codes...
//i assume your parsed string(which you want to share) is an NSString called myString;
NSLog("Result from Server: %@", myString);
 YourAppDelegate   *sharedData = (YourAppDelegate *)([[UIApplication sharedApplication]delegate]);
sharedData.sharedString= myString;
}
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//ClassB.m
//in your classB, again import your AppDelegate,
.
.
//navigate to the method you want to retrieve shared data
YourAppDelegate   *sharedData = (YourAppDelegate *)([[UIApplication sharedApplication]delegate]);
NSString *myNewString =sharedData.myString;
.......
.
.