流程只能调用或订阅到下游层的流程中的事件，如箭头所示。
Processes can only call or subscribe to events from processes in downstream layers, as indicated by the arrows.
显示的四个策略组根据箭头所示归“根组织”拥有。
The four policy groups shown are owned by the "Root Organization" via the arrows.
流程只能调用或订阅到下游层中的子流程的事件，如箭头所示。
Processes can only call or subscribe to events from sub-processes in downstream layers, as indicated by the arrows.
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