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--- en:rule:use-default-flow-only-in-executable-models [2024-08-22 20:08] – [Analytical model] Anatoly Belaychuk
+++ en:rule:use-default-flow-only-in-executable-models [2025-04-01 11:25] (current) – [Exceptions] Anatoly Belaychuk
@@ Line 3: / Line 3: @@
 {{tag>default_flow}}
-Use default flow only if the model to be executed by a process engine.
+Use default flow outgoing from the exclusive gateway only if the model to be executed by a process engine.
 ===== ✔ How to =====
-==== Executable model ====
+Executable model:
 <bpmnio type="bpmn">
@@ Line 140: / Line 140: @@
 </bpmnio>
-Analytical model:
+Non-executable model:
 <bpmnio type="bpmn">
@@ Line 277: / Line 277: @@
   * When used in the executable model, the default flow guarantees that the process will continue even if there is a mistake in the flow conditions. E.g. there may be a gateway controlled by a boolean attribute stored in a database. Process designer may define flow conditions as "if value is TRUE" and "if value is FALSE". It'd be a mistake because the attribute value may be also NULL. Therefore it's more robust to define explicit condition for one flow and mark the other as default flow.
   * In case of analytical model default flow doesn't add value but may confuse reader.
+===== Exceptions =====
+The above applies to exclusive gateways only. As for exclusive gateways, the default flow is useful both in executable and non-executable models:
+<bpmnio type="bpmn">
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" id="sid-38422fae-e03e-43a3-bef4-bd33b32041b2" targetNamespace="http://bpmn.io/bpmn" exporter="http://bpmn.io" exporterVersion="0.10.1">
+  <process id="Process_1vphr67">
+    <inclusiveGateway id="Gateway_0h14sq9" default="Flow_1fiufcu">
+      <outgoing>Flow_0v7gy70</outgoing>
+      <outgoing>Flow_1q65gr0</outgoing>
+      <outgoing>Flow_1fiufcu</outgoing>
+    </inclusiveGateway>
+    <task id="Activity_0s9ye6s" name="Fix syntax errors">
+      <incoming>Flow_0v7gy70</incoming>
+      <outgoing>Flow_1yo36j4</outgoing>
+    </task>
+    <sequenceFlow id="Flow_0v7gy70" name="syntax errors detected" sourceRef="Gateway_0h14sq9" targetRef="Activity_0s9ye6s" />
+    <task id="Activity_0utrx8b" name="Fix substantial errors">
+      <incoming>Flow_1q65gr0</incoming>
+      <outgoing>Flow_0lb8qxs</outgoing>
+    </task>
+    <sequenceFlow id="Flow_1q65gr0" name="substantial errors detected" sourceRef="Gateway_0h14sq9" targetRef="Activity_0utrx8b" />
+    <sequenceFlow id="Flow_0lb8qxs" sourceRef="Activity_0utrx8b" targetRef="Gateway_0ncb01t" />
+    <inclusiveGateway id="Gateway_0ncb01t">
+      <incoming>Flow_0lb8qxs</incoming>
+      <incoming>Flow_1yo36j4</incoming>
+      <incoming>Flow_1fiufcu</incoming>
+    </inclusiveGateway>
+    <sequenceFlow id="Flow_1yo36j4" sourceRef="Activity_0s9ye6s" targetRef="Gateway_0ncb01t" />
+    <sequenceFlow id="Flow_1fiufcu" sourceRef="Gateway_0h14sq9" targetRef="Gateway_0ncb01t" />
+  </process>
+  <bpmndi:BPMNDiagram id="BpmnDiagram_1">
+    <bpmndi:BPMNPlane id="BpmnPlane_1" bpmnElement="Process_1vphr67">
+      <bpmndi:BPMNShape id="Gateway_12uxsxa_di" bpmnElement="Gateway_0h14sq9">
+        <omgdc:Bounds x="285" y="265" width="50" height="50" />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="Activity_0s9ye6s_di" bpmnElement="Activity_0s9ye6s">
+        <omgdc:Bounds x="400" y="140" width="100" height="80" />
+        <bpmndi:BPMNLabel />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="Activity_0utrx8b_di" bpmnElement="Activity_0utrx8b">
+        <omgdc:Bounds x="390" y="370" width="100" height="80" />
+        <bpmndi:BPMNLabel />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="Gateway_1rj8ws5_di" bpmnElement="Gateway_0ncb01t">
+        <omgdc:Bounds x="545" y="265" width="50" height="50" />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNEdge id="Flow_0v7gy70_di" bpmnElement="Flow_0v7gy70">
+        <omgdi:waypoint x="310" y="265" />
+        <omgdi:waypoint x="310" y="180" />
+        <omgdi:waypoint x="400" y="180" />
+        <bpmndi:BPMNLabel>
+          <omgdc:Bounds x="293" y="220" width="64" height="27" />
+        </bpmndi:BPMNLabel>
+      </bpmndi:BPMNEdge>
+      <bpmndi:BPMNEdge id="Flow_1q65gr0_di" bpmnElement="Flow_1q65gr0">
+        <omgdi:waypoint x="310" y="315" />
+        <omgdi:waypoint x="310" y="410" />
+        <omgdi:waypoint x="390" y="410" />
+        <bpmndi:BPMNLabel>
+          <omgdc:Bounds x="283" y="360" width="85" height="27" />
+        </bpmndi:BPMNLabel>
+      </bpmndi:BPMNEdge>
+      <bpmndi:BPMNEdge id="Flow_0lb8qxs_di" bpmnElement="Flow_0lb8qxs">
+        <omgdi:waypoint x="490" y="410" />
+        <omgdi:waypoint x="570" y="410" />
+        <omgdi:waypoint x="570" y="315" />
+      </bpmndi:BPMNEdge>
+      <bpmndi:BPMNEdge id="Flow_1yo36j4_di" bpmnElement="Flow_1yo36j4">
+        <omgdi:waypoint x="500" y="180" />
+        <omgdi:waypoint x="570" y="180" />
+        <omgdi:waypoint x="570" y="265" />
+      </bpmndi:BPMNEdge>
+      <bpmndi:BPMNEdge id="Flow_1fiufcu_di" bpmnElement="Flow_1fiufcu">
+        <omgdi:waypoint x="335" y="290" />
+        <omgdi:waypoint x="545" y="290" />
+      </bpmndi:BPMNEdge>
+    </bpmndi:BPMNPlane>
+  </bpmndi:BPMNDiagram>
+</definitions>
+</bpmnio>
 ===== See also =====