流程与规则之间的通信通过服务的接口进行。
Communication between the process and the rule itself is through the interface of the service.
通过服务使流程与规则分离，意味着封装规则的服务不操作流程的数据结构。
This decoupling of processes and rules, through the use of services, means that services that encapsulate rules do not operate on the data structures of the process.
与 BPMN 类似的是，EPC 也使用相同的规则符号来打开和关闭流程流中的分支。
Similar to BPMN, EPCs use the same rule symbols to open and close branches in the process flow.
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