In the code fragment above, the error message contains a prefix, BTLERR001, which is a unique error code for the application.
在以上代码片断中,错误消息包含了前缀btlerr001,它是用于该应用程序的特定错误代码。
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The purpose of these declarations is to associate a namespace prefix with a particular URI as a shortcut, which you can then reuse later in the XML message.