XML has spawned a set of related standards for querying and transforming data.
XML已有一套查询和变换数据的相关标准。
While these methods can work well for relational data, they are not suitable for querying XML data.
尽管这些方法都适合关系数据，但是不适合查询XML数据。
The following figure shows the structure of an RCTE for querying recursive data.
下图显示了查询递归数据的RCTE结构。
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