XPath是一种强大的语言，它允许您编写用来从XML数据中检索信息的简明表达式。
XPath is a powerful language that allows you to write concise expressions for retrieving information from XML data.
正则表达式(regex)使用简明、易读的符号描述模式。
A regular expression (regex) describes patterns in a concise, readable notation.
WS - Policy定义了一些选项，您可以用来创建比标准形式更简明的策略表达式，使策略更易理解。
WS-Policy defines options you can use to create policy expressions that are more concise than the normal form permits, making the policies easier for humans to understand.
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