E_ALL对于开发过程来说有点太细，因为它在屏幕上为一些小事(例如变量未初始化)也显示提示，会搞糟浏览器的输出。
E_ALL is a little too picky for my liking in the development process because it clutters the browser output by displaying notices on the screen for small things like uninitialized variables.
将过程输出参数声明为blob变量。
A BLOB variable is declared for the procedure output parameter.
我们首先考虑如何将XMLQuery函数的输出返回给存储过程中声明的变量。
Let's first consider how to return the output of the XMLQuery function to variables declared in a stored procedure.
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