Parallelgateway and exclusivegateway of 14 gateways

The gateway is actually the place where process nodes are shunted , When the task arrives at the gateway , According to the nature and setting conditions of the gateway, it is decided to take the branch that meets the requirements ,BPMN The following four types of parallel gateways are provided by the specification （ParallelGateway）, Exclusive gateway （ExclusiveGateway）, Inclusive gateway （InclusiveGateWay）, Event gateway （EventGateway）.

1 Parallel gateway ParallelGateway

Parallel gateway （ParallelGateway） It means that multiple branch tasks should be executed in parallel , When all parallel tasks are finished , The parallel gateway task ends . Let's use the following example to explain , Writing process definitions parallelGateway.bpmn20.xml, The details are as follows ：

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20