首先您需要了解的概念是等价类。
The first concept that you need to understand is the equivalence class.
阅读实用数据绑定专栏的第一篇文章，Brett分析了数据绑定中的几个重要概念，包括往返和语义等价。
Read the first installment of the Practical data binding column in which Brett examines several important concepts in data binding, including round-tripping and semantic equivalence.
上一期文章中曾经指出，构造型和标签可以作为扩展uml模型的工具，以便支持在UML中没有等价物的XML概念。
In the previous article, I pointed to stereotypes and tags as tools to extend the UML model and support XML concepts that have no equivalent in UML.
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