title: List of animationID in beginAnimations method
body: <p>I there any specific list for animationID in <code>+ (void)beginAnimations:(NSString *)animationID context:(void *)context</code> method ?
  for example I see this code :</p>
  
  <pre><code>[UIView beginAnimations : @"Display notif" context:nil]; 
  [UIView setAnimationDuration:1];
  [UIView setAnimationBeginsFromCurrentState:FALSE];
  
      CGRect frame = paperCurl.frame;
      frame.size.height -= 40;
      frame.origin.y += 40;
      paperCurl.frame = frame;
  
  [UIView commitAnimations];
  </code></pre>