UML( Unified Modeling Language )是一种定义良好，易于表达，功能强大且普遍实用的建模语言。它溶入了软件工程领域的新思想、新方法和新技术。它不仅可以支持面向对象的分析与设计，更重要的是能够有力地支持从需求分析开始的软件开发的全过程。需要说明的是，UML是一种建模语言，而不是一种方法。
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