用指定字符填充描述符的数据区域，并覆盖原有数据。
Fills the descriptor's data area with the specified character, replacing any existing data.
但多数交互都是在已有页面上增加细节、修改主体文本或者覆盖原有数据。
But most interactions add details or change body text or overlay data on the existing pages.
XED是在原有数据库基础上扩展了XML支持模块，完成XML数据和数据库之间的格式转换和传输。
XED is the expansion of the XML supporting modules based on the original database, which accomplishes format conversion and transmission completes between XML data and database.
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