XML parser doubt for iphone

Question

i am using same XML parser class to parse 3 class with same attributes name lke each class has name, id , rollno so is it good to parse them in 1 xmlparser only and do each time like this

if ( [elementName isEqualToString:@"name"]) {

  [appDelegate.zone addObject:currentElementValue];

}

for all? plz guide me how to parser 3 xml for 3 class