重点研究了该引擎的组合流程执行机制，并给出了引擎调度算法。
Also, the invocation mechanism of the execution engine and its scheduling algorithm was provided.
因为流程是活动的集合，我们需要定出装配及执行这种集合的机制。
Since process is a collection of the activities, we need to figure out the mechanism to assemble and execute such collection.
任何流程只有存在其执行机制、遵从性标准、以及异常和升级流程时才有效。
Any process is only as good as its enforcement mechanisms, compliance criteria, and exception and escalation procedures.
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