The only rule when creating instances of DataObjects is that no DataObject with a change summary may contain another DataObject with a change summary.
创建数据对象实例的唯一规则是，任何带更改摘要的数据对象都不能包含其他带更改摘要的数据对象。
2
In summary, as a general rule, the operational requirements derive from these sources.
总的来说，作为一般性的规律，运营性需求来自于以下方面。
3
The fourth part from the analysis summary porch space rule, the variation rule obtained, proposed the porch space the principle which should follow in the design.