Modelling, but in particular, Xtext as a textual modelling language and DSL.

模型化，Xtext作为一种文本模型化语言和领域特定语言。

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The primary contents are summarized as follows:An overview of the key functions of the EXPRESS modelling language as well as a formal semantic description of the EXPRESS data model is introduced.

对EXPRESS建模语言的核心功能作了概述，并给出了EXPRESS数据模型的一个形式化语义描述。

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UML (Unified Modelling Language) is a mechanism for representing software in the form of diagrams.

统一建模语言是一种通过图的方式表示软件的机制。

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UML (Unified Modelling Language) is a mechanism for representing software in the form of diagrams.

统一建模语言是一种通过图的方式表示软件的机制。

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