They're for reading files that have reasonably structured formats.

它们用于读取结构化格式较好的文件。

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The goal of this project is to create a set of tools for manipulating plaintext documents, including exporting them to structured formats like HTML, XML, and TeX.

这个项目的目标是创建一组用来操作纯文本文档的工具，包括将这些文档导出成诸如 HTML、XML 和 TeX 之类的结构化格式。

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