你也能将表达式树中的数据转换到其他的域的数据形式(如xml)。
You can also convert the data in the expression tree into another domain (such as XML).
然后,在最终的转换表达式中,就可以像其他任何模板变量一样使用这个新的模板变量。
Then, in the final transformation expression, the new template variable can be used like any other.
但是,转换表达式也可以出现在更新2这样的查询中。
However, they could just as well appear in queries as shown in Update 2.
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