通信保障局负责对分级规范进行修订。
Communication safeguard bureau is in charge of bisect class standard undertaking editing.
专门化还为多层或分级规范提供了支持，允许更一般的主题类型作为不同特殊类型的公共基础。
Specialization also provides support for multi-level or hierarchical specializations, which allow more general topic types to serve as the common denominator for different specialized types.
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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