花括号告诉XQuery处理程序要将包围起来的数据作为需要求值和替换的变量而不是文字文本。
These curly braces let the XQuery processor know to treat the enclosed data as variables that are evaluated and replaced with a value, rather than literal text.
花括号告诉XQuery处理程序要将包围起来的数据作为需要求值和替换的变量而不是文字文本。
These curly braces let the XQuery processor know to treat the enclosed data as variables that are evaluated and replaced with a value, rather than literal text.
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