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。
Path expression is one of the core components of most XML query languages. However, there are few researches on the issue of path expression optimization.
路径表达式是XML数据查询语言的核心部分，但是目前针对路径表达式本身进行优化的研究却相对较少。
XML-based query languages are constructed to reach any arbitrary position within an XML document's "graph" using sequences of edge labels and delimiters representing a path.
基于XML的查询语言被构造来，使用表示路径的边标签和定界符序列达到XML文档图中的任意位置。
The expressive power of XQuery is comparable to the criterion of "relational completeness" defined for database query languages, though no such formal standard has been defined for an XML data model.
XQuery的表达能力可以与为数据库查询语言定义的“关系完整性”标准相比，虽然还没有为XML数据模型定义这样的正式标准。
In order to effectively analyze and process these XML data, researchers have proposed various query languages and storage managing techniques of XML.
为了有效地加工、分析和处理XML数据，国内外学者已经提出了各种XML的查询语言和存储管理技术。
Now DB2 can query this data using SQL/XML and XQuery languages by using the nicknames created for the view.
现在DB2可以使用SQL/XML和XQuery语言通过为视图创建的别名来查询数据。
The extensions enable construction of compositional APIs that have equal expressive power of query languages in domains such as relational databases and XML.
这些扩展使得结构性API构造具有与其他领域（如关系数据库和XML）中查询语言同等的表达能力。
At present, the industrial circles and academic made a lot of XML query language, grammatical forms and query capabilities in various languages are different.
目前，工业界和学术界提出了很多种XML查询语言，各种语言在语法形式和查询能力上都不尽相同。
At present, the industrial circles and academic made a lot of XML query language, grammatical forms and query capabilities in various languages are different.
目前，工业界和学术界提出了很多种XML查询语言，各种语言在语法形式和查询能力上都不尽相同。
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