与二进制格式不同，在文本编辑器或文本查看器中打开XML文档也不是不可能。
Unlike binary formats, it is not out of the question to open an XML document in a text editor or text viewer.
如果一个应用程序由3个窗口(例如，一个登录窗口、一个文本查看窗口和一个文件查看窗口)组成，那么每一个窗口通常用一个不同的Activity类来表示。
If an application consists of three Windows (for example, a login window, a text-viewing window, and a file-viewing window), each is typically represented by a different Activity class.
这两个sql语句作为文本比较，以便轻松查看并修改。
The two SQL statements are compared as text for easy viewing and modification.
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