在某些名词的定义中，绝对性的不可能性本身就增加了它们可能达到的内涵层次。
The very impossibility of absoluteness in the definition of certain nouns adds to the levels of connotation they may reach.
RUP提出：参考体系结构应当按照不同层次的抽象，或者作为“视图”来定义，因此在使用时能够提供更多的适应性。
The RUP suggests that a reference architecture should be defined along different levels of abstraction, or "views," thereby providing more flexibility in how it can be used.
为了支持这些原则，OMG 已经定义了一系列的层次和转换，他们为 MDA 提供了概念性的框架和词汇表。
To support these principles, the OMG has defined a specific set of layers and transformations that provide a conceptual framework and vocabulary for MDA.
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