因此，最终结果应该是一个包含两个值元素named - USPrice的节点集，这两个元素都存有字符串参数形式的数值。

Hence the final result would be a node-set containing two value elements named — USPrice, where both hold a numeric value in the form of a string literal.

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终结符号处理过程中，深入地研究了字符串匹配算法和正则表达式匹配算法，并实现了二叉排序树字符串匹配算法。

First, classic string matching algorithms and regular expression matching algorithms are studied; second a binary sort tree string matching algorithm is proposed and realized.

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