Business Process Model and Notation（业务流程模型和表示法）
获取bpmn任务节点；xPath解析BPMN；从bpmn xml获取任务信息
bpmn 信号事件与消息事件区别
BPMN2_0_Poster_CN.pdf
https://bpm-conference.org/assets/docs/bpmn-poster/BPMN2_0_Poster_CN.pdf
BPMN 2.0规范BPMN 2.0 概述BPMN 2.0（Business Process Model and Not - 掘金