NoSQL databases do not provide a high-level declarative query language like SQL to avoid overtime in processing.

NoSQL的数据库没有像SQL提供一个高层次的声明性查询语言。

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XQuery is a high-level, strongly-typed, functional language (free of side-effects) that is ideal to express a query to obtain data both from an XML document and a large XML document repository.

XQuery是一种高端的、强类型的函数语言(没有副作用)，非常适合表达从XML文档或者大型XML存储库(repository)中获取数据的查询。

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