UML是一种通用语言，因此虽然支持很多建模概念，但是缺乏针对XML的一些概念。
UML is a universal language, so although it supports many modeling concepts it lacks some concepts that are specific to XML.
UML是一种通用的可视化建模语言。
统一建模语言(uml)是一个通用可视化的建模语言，用来对软件系统的制品进行定义、图形化、构造和文档化。
The Unified modeling language (UML) is a general-purpose visual modeling language that is used to specify, visualize, construct, and document the artifacts of a software system.
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