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| Rev 1130 | Rev 1271 | ||
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| Line 267... | Line 267... | ||
| 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 |