Many engines were content to offer alternatives, including jBPM.
很多引擎都提供了其他选择，比如jBPM。
JBPM allows the use of tasks and task nodes as part of the overall process design.
jBPM允许将任务和任务节点作为整个流程设计的一部分使用。
This required modifications to both task and task-instance classes provided by jBPM.
这就要求修改jBPM提供的任务和任务实例类。
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