域模型是一个可以序列化为XML的嵌套对象的递归数据结构。
The domain model is a recursive data structure of nested objects that can be serialized as XML.
下图显示了查询递归数据的RCTE结构。
The following figure shows the structure of an RCTE for querying recursive data.
Lisp提供用于迭代的编码结构，但递归是更受欢迎的列表遍历方式。
Lisp provides coding structures for iteration, but recursion is a far more popular way to navigate lists.
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