title: ALAssetURL unique even after SYNC ipad/iPhone with iTunes
body: <p>The documentation describes it as 'persistent' (<a href="http://developer.apple.com/library/ios/documentation/AssetsLibrary/Reference/ALAssetRepresentation_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40009728-CH1-SW16" rel="nofollow">http://developer.apple.com/library/ios/documentation/AssetsLibrary/Reference/ALAssetRepresentation_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40009728-CH1-SW16</a>) but does this mean persistent over a single sync, persistent until new photos are added, persistent until old photos are deleted, or what? If I build a database that associates photo elements in the Camera Roll/Photo Library to data in my application using their ALAssetRepresentation url's, will these associations continue to work forever, even if the photos are moved or renamed?</p>
  
  <p>If Asset url are not unique after sync then what is the alternate solution for this as i need to identify assets uniquely even after sync.</p>