/** @since Available in iOS 4.0 and later. */
 public CMTimeCodeFormatDescriptionSourceReferenceName getSourceReferenceName() {
   if (has(Keys.SourceReferenceName())) {
     CFDictionary val = get(Keys.SourceReferenceName(), CFDictionary.class);
     return new CMTimeCodeFormatDescriptionSourceReferenceName(val);
   }
   return null;
 }
 /** @since Available in iOS 4.0 and later. */
 public CMTimeCodeFormatDescriptionExtension setSourceReferenceName(
     CMTimeCodeFormatDescriptionSourceReferenceName sourceReferenceName) {
   set(Keys.SourceReferenceName(), sourceReferenceName.getDictionary());
   return this;
 }