泳道、任务事件、任务定时器及身份组件

9.4. Swimlanes（咏道）
A swimlane is a process role(角色). It is a mechanism to specify that multiple tasks in the process should be done by the same actor.(多个任务被同一个用户执行) So after the first task instance is created for a given swimlane, the actor should be remembered in the process for all subsequent（后来的） tasks that are in the same swimlane. A swimlane therefore has one assignment and all tasks that reference a swimlane should not specify an assignment. A swimlane is a process role(