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| ODER-Einschränkung n (An indicator of a situation in which any instance of a class can participate in only one association at one time. The constraint is shown as a dashed line connecting two or more associations, which must have a class in common) | |||
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OR constraint : 3 短语, 2 学科 |
| 一般 | 1 |
| 法律 | 2 |