/** @since Available in iOS 8.0 and later. */
 public CFString getIdentifier() {
   if (has(Keys.Identifier())) {
     CFString val = get(Keys.Identifier(), CFString.class);
     return val;
   }
   return null;
 }
 /** @since Available in iOS 8.0 and later. */
 public CMMetadataFormatDescriptionMetadataSpecification setIdentifier(CFString identifier) {
   set(Keys.Identifier(), identifier);
   return this;
 }