匹配键是用来识别设备的条件，当规则中所有对应设备的匹配键都被匹配以后，规则会被执行，并且触发动作。
Match keys are conditions used to identify the device which the rule is acting upon.
论文主要研究了事件—条件—动作(eca)规则的形式化描述及其在工作流运行控制中的应用。
This paper mainly discusses the formalization description of Event-Condition-Action (ECA) rules and its application in workflow runtime control.
策略规则由策略的触发条件和触发后执行的动作组成。
The rule carries out its action after triggering the condition.
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