Only the global common model and global data operation can be saw by the user, and the actual data operations are separated into sub-operations according to data sources, then the results are returned to users by integrated system.

• 在客户端，用户看到的只是一个全局公共模型和全局的数据操作； 在集成系统内部，实际的用户数据操作被集成系统分解为针对各数据源的子操作，子操作结果再由集成系统汇总返回给用户。