在UML 2.0中，只定义了三个规范性层次，那些对应于分级语言单元的层已经在0层中就被提及并描述了。
In UML 2.0, only three levels of compliance are defined, and those correspond to the hierarchical language unit levels already mentioned and depicted in 0 earlier.
在UML 2.0中，只定义了三个规范性层次，那些对应于分级语言单元的层已经在0层中就被提及并描述了。
In UML 2.0, only three levels of compliance are defined, and those correspond to the hierarchical language unit levels already mentioned and depicted in 0 earlier.
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