The regular expression argument is the routing mechanism.
正则表达式参数是路由机制。
Notice, in line 60, the XPath expression as argument of SUM function.
注意第60行中作为SUM函数参数的XPath表达式。
The type argument is the type of the value the expression evaluates to.
类型参数就是表达式要计算的值的类型。
The two-argument case starts off with a let expression.
两个参数的情况从let表达式开始。
The two-argument case starts off with a let expression.
两个参数的情况从let表达式开始。
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