本主题中的扩展示例演示如何编辑向导创建的文件，以创建从文本文件读取一组两个字符串的简单只读提供程序。
The extended example in this topic shows how to edit the wizard-created files to create a simple read-only provider that reads a set of two strings from a text file.
LISP程序可以从文本文件中读取语句，并且好像它们是原始程序一部分一样执行它们。
A LISP program can read LISP statements from a text file and execute them as if they were part of the original program.
处理文本文件通常包括读取信息单元(通常叫做字符或行)，然后对刚读取的单元执行适当操作。
Processing a text file often consists of sequentially reading a unit of information (typically either a character or a line) and doing something in response to the unit you've just read.
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