====== workflow 工作流 ======
  * [[https://www.ithere.net/article/1454000794869297153|Java开源工作流框架对比]] ，不错
    * [[https://github.com/Activiti/Activiti|Activiti]]
    * [[https://github.com/flowable/flowable-engine|Flowable]]
    * [[https://github.com/camunda/camunda-bpm-platform|Camunda]]
  * [[https://www.bpmn.org/|BPMN]]: [[https://zh.wikipedia.org/wiki/%E4%B8%9A%E5%8A%A1%E6%B5%81%E7%A8%8B%E6%A8%A1%E5%9E%8B%E5%92%8C%E6%A0%87%E8%AE%B0%E6%B3%95|业务流程模型和标记法]]