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[JoeBlaze]

The problem is that applicationDidFinishLaunching only occurs once so the passedString value will never be searched again if changed.

Try this in the app delegate

- (void)applicationDidFinishLaunching:(UIApplication *)application{
	// Configure and show the window
	[window addSubview:[navigationController view]];
	[window makeKeyAndVisible];
}
//Implement your own boats getter 
- (NSArray*)boats{
//I recommend surrounding all of this code before the return with an if statement
//checking to see if passedString has changed to prevent duplicate web calls

NSString *xmlStart = @"http://www.mysite.com/search="; 	
	NSString *searchWord = passedString; 
	NSString *xmlEnd = @"&xml=1";
	
	NSString *newString;
	newString = [xmlStart stringByAppendingString:searchWord];	
	XML = [newString stringByAppendingString:xmlEnd];
	

	NSURL *url = [[NSURL alloc] initWithString:XML];
	NSXMLParser *boatListParser = [[NSXMLParser alloc]       initWithContentsOfURL:url];
	
	BoatListParser *parser = [[BoatListParser alloc] initBoatListParser];
	[boatListParser setDelegate:parser];
	
	BOOL success = [boatListParser parse];
	
	if(success)
		NSLog(@"Success");
	else
		NSLog(@"Error");

return (boats parsed from xml); //This is where you return the array of BOAT objects
}