https://naiwaen.debuggingsoft.com/2018/06/bpmn-%e0%b9%80%e0%b8%9e%e0%b8%b4%e0%b9%88%e0%b8%a1%e0%b9%80%e0%b8%95%e0%b8%b4%e0%b8%a1%e0%b9%80%e0%b8%81%e0%b8%b5%e0%b9%88%e0%b8%a2%e0%b8%a7%e0%b8%81%e0%b8%b1%e0%b8%9a-multiinstanceloopcharacteristi/