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。
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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