The domain model is a recursive data structure of nested objects that can be serialized as XML.
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 accessibility domain of a nested type never exceeds that of the containing type.
嵌套类型的可访问域决不能超出包含类型的可访问域。
That is, the domain is the type body, which includes all nested types.
也就是说，定义域是型别主体，其中包括所有的巢状型别。
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