UML还继承了图形建模语言(graphical modeling language )的优良传统：高屋建瓴的抽象能力。而普通的编程语言恰恰缺乏这种描述设计思想的能力:"The fundamental driver behind them all ...
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使用UML这种标准化的图形建模语言对公交换乘系统进行需求分析、设计、构造和系统测试。
This article introduces how to use UML, a standard graphic module language, to do the requirement analysis, design, construction and system testing of a Public Transport Changing system.
但是，关联的多重性经常不是任意的，而依赖于属性值，这不能用图形建模语言，例如UM l类模型来表示。
However, the multiplicity of associations often is not arbitrary, but depends on attribute values, which cannot be expressed with graphical modeling languages such as UML class models.
统一建模语言（Unified Modeling Language，UML）为用例定义图形符号，针对系统应该做什么，而不是如何去做。
The Unified Modeling Language (UML) defines a graphical notation for use cases, which focus on what a system should do rather than how it should do it.
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