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统一建模语言 (UML) 规范
2022-07-27 17:14:00 【汽车电子与软件开发】
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1 元模型
模型是元模型的一个实例。元模型就是模型。
这自然会导致元元模型(元2模型)、元3模型等的层次结构。
2 UML 规范采用了四个级别的元模型:M0、M1、M2 和 M3
可以将对象图视为实例化类图的 0 级模型 (M0)。
可以将类图视为实例化 2 级元模型的 1 级元模型 (M1) 。
2 级元模型 (M2) 是 UML 规范。M2 实例化OMG 的 元对象设施 (MOF),这是一个 3 级元3模型 (M3)。

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