title: What does the @package directive do in Objective-C?
body: <p>Does anyone know exactly what the @package directive is used for in Objective-C?</p>
  
  <p>The only mention I could find of it in Programming in Objective-C 2.0 by Stephen Kochan was:</p>
  
  <blockquote>
    <p>@package - For 64 bit images, the instance variable can be accessed anywhere within the image that implements the class</p>
  </blockquote>
  
  <p>...</p>
  
  <p>What? Is this restricted to being used with images, as in pictures? Or does it mean images as in disk images?</p>
  
  <p>It's a confusing description, and doesn't elaborate whatsoever throughout the rest of the book....</p>
  
  <p>Any help would be awesome, thanks!</p>