查询表达式的转换通过一系列例子示范如下。正式的转换规则的描述在后面部分。
The translation of query expressions is demonstrated through a series of examples in the following. A formal description of the translation rules is provided in a later section.
在从数据库读取XML文档并传递给应用程序的过程中，可以在查询中使用转换表达式修改XML文档。
A transform expression can be used in a query to modify an XML document as it is read from the database and passed to the application.
初始查询中的XMLEXISTS谓词被转换为一个复杂表达式，可以通过编号Q 1引用。
The XMLEXISTS predicate in the original query got converted into a complex expression that can be referred to using the number Q1.
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