public static boolean isPHDRMetadataTrackSubDescriptor(byte[] key){
  return Arrays.equals(key,StructuralMetadata.PHDR_METADATA_TRACK_SUBDESCRIPTOR);
}

public static boolean isPHDRMetadataTrackSubDescriptor ( byte [ ] key ) { return Arrays . equals ( key , StructuralMetadata . PHDR_METADATA_TRACK_SUBDESCRIPTOR ) ; }
a method that determines if the key passed in corresponds to a phdrmetadatatracksubdescriptor .
