The central engine communicates with the execute engine as the Observer pattern works. Implements the asynchronous characteristic by using JMX Notification Model and JMX Timer Service.

早期的工作流应用系统都是集中式的，即由一个工作流引擎去完成整个流程实例的执行。

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Once this rule command class is created, it is triggered to execute the correct rule in that specific rule engine.

一旦一个规则命令类被创建，它将在特定的规则引擎上被触发且执行正确的规则。

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This means that the engine internally might execute some of the activities automatically.

这意味着引擎内部会自动地执行一些活动。

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BizTalk Orchestration features a drag and drop design tool, a runtime engine to execute and debug applications and a "binding architecture" for tying business processes with applications that automate them.

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