例如，目前将要出现的外部模型和模型转换的理论，它强制性要求一个模型语言如何来定义。
For example, there are now emerging theories of meta-modeling and of model transformations, which impose certain demands on how a modeling language should be defined.
对于使用的每一种编程语言来说，都需要有一种映射来方便的转换已定义的IDL概念。
For each programming language used there must be a mapping that will easily translate the IDL concepts that have been defined.
清单2中rest格式的文档可以自动地转换成XML语言变体(如Docutils Generic DTD所定义的格式)。
The reST-formatted document in Listing 2 can be automatically transformed into an XML dialect, such as that defined by the Docutils Generic DTD.
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