In a BPEL process, correlation means the matching of incoming service request messages with existing process executions that are waiting for such an incoming message.
在BPEL过程中，关联是指输入服务请求消息和当前正在等待此消息的过程实例间的匹配。
Tasks are part of the process definition and they define how task instances must be created and assigned during process executions.
任务是流程定义的一部分，并且它们定义了在流程执行中任务实例如何必须被创建和分派。
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