XPath也有一个sum函数，它以匹配节点的内容作为参数，将这些参数转换成数值，并返回这些值的和。
XPath also has a sum function, which will take the contents of the matching nodes, convert them to numeric values, and return the sum of those values.
XPath也有一个sum函数，它以匹配节点的内容作为参数，将这些参数转换成数值，并返回这些值的和。
XPath also has a sum function, which will take the contents of the matching nodes, convert them to numeric values, and return the sum of those values.
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