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267 | /** |
267 | /** |
268 | * @return OIDplusFourCC|null |
268 | * @return OIDplusFourCC|null |
269 | */ |
269 | */ |
270 | public function one_up()/*: ?OIDplusFourCC*/ { |
270 | public function one_up()/*: ?OIDplusFourCC*/ { |
271 | // A FourCC is a FourCC, there is no hierarchy |
271 | // A FourCC is a FourCC, there is no hierarchy |
272 | return null; |
272 | return self::parse(self::ns().':'); |
273 | } |
273 | } |
274 | 274 | ||
275 | /** |
275 | /** |
276 | * @param OIDplusObject|string $to |
276 | * @param OIDplusObject|string $to |
277 | * @return int|null |
277 | * @return int|null |