data model hierarchy 数据模型层次
The Order could be the root of another hierarchy in the data model.
订单可能是数据模型中的其他层次的根。
Figure 6 presents the updated persistence model for mapping the entire class hierarchy into one data entity.
图6显示了一个更新过的持久性模型，用于将整个类层次结构映射成一个数据实体。
Since the client has the complete data model hierarchy, it is possible for the client to send subclasses in the hierarchy in a request to the Web service.
由于客户端拥有完全的数据模型层次，客户端就有可能在Web服务请求中发送层次中的子类。
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