最根本的改变是模型不再只作为文档供程序员阅读，它们可以直接用来驱动软件开发。
The essential change is that models are no longer used only as mere documentation for programmers, but can now directly be used to drive software development.
通过满足上述要求，这个框架允许程序员将多个XML文档读入内存(解组)，修改DOM，然后将更改保存回一个XML文档(编组)。
By satisfying the requirements above, the framework allows programmers to read XML documents in (unmarshalling), modify the DOM, and save changes back to an XML document (marshalling).
直到最近，程序员通过编程创建 XML 文档还只有两种选择。
Until recently, programmers had only two choices when creating XML documents programmatically.
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