The first argument of both of these calls is a regular expression specifying the URL that the customer may pass in.
这两次方法调用的第一个参数是一个正则表达式,用于指定用户可能传入的 URL。
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 dyn: evaluate function converts its argument to a string and dynamically evaluates that string as an XPath expression, returning the result of this evaluation.
evaluate函数将其参数转化成一个字符串,将该字符串作为XPath表达式进行动态计算,并返回结果。
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