question: public static boolean isValidIfd ( int ifdId ) { return ifdId == IfdId . TYPE_IFD_0 || ifdId == IfdId . TYPE_IFD_1 || ifdId == IfdId . TYPE_IFD_EXIF || ifdId == IfdId . TYPE_IFD_INTEROPERABILITY || ifdId == IfdId . TYPE_IFD_GPS ; }
target:  Returns true if the given IFD is a valid IFD.