Navigating XML queries by path expression is the common characteristic of XML query languages.
利用路径表达式导航XML查询是XML查询语言的共同特点。
Path expression is a common feature of XML query languages. Many indexing methods have been proposed.
路径查询是XML查询的一个主要特征，现已提出了多种XML索引方法。
The common feature of the XML query languages is the use of regular path expressions (i. e. RPE) to query XML data.
各种XML查询语言的共同特点就是利用正则路径表达式(RPE)来导航XML文档的查询。
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