既然已经安装了Emacs，已经为定制它打下了基础，那么我们将考虑如何添加包，这些包为编辑和验证SGML和XML文档提供环境。

Now that you have Emacs installed and you've laid the foundation for customizing it, we'll look at how to add packages that provide an environment for editing and validating SGML and XML documents.

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