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。
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.
Query工作组的早期活动之一就是起草xml查询语言需求的正式声明。
One of the earliest activities of the query working group was to draw up a formal statement of requirements for an XML query language.
XML Query 工作组在 1999 年 9 月正式成立，任务是创建一种灵活的查询语言来从 XML 文档中抽取数据。
The XML Query working group, chartered in September 1999, was tasked with creating a flexible query language to extract data from XML documents.
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