Be able to create second process in collaboration diagram

[dkapur17]

Is your feature request related to a problem? Please describe.

I'm unable to create multiple processes using the CLI tool. By default, say there already exists a process, then creating a new participant would simply attach a participant to that process, which is fine. This also has a secondary effect, where in the elements list, it replaces a process with a collaboration and a participant. Now to create a second participant, we would call create again with type participant and pass it id of the collaboration as the parent. However, this only creates a participant in that collaboration and not a process, which leads to irregular diagram behavior.

Describe the solution you'd like

When creating a new participant, also create a new process and link it to the participant.

Describe alternatives you've considered

None.

Additional context

Here is the initial XML I use to feed into the modeller

<?xml version="1.0" encoding="UTF-8"?>
<bpmn:definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" id="Definitions_1" targetNamespace="http://bpmn.io/schema/bpmn">
  <bpmn:collaboration id="Collaboration">
    <bpmn:participant id="Participant_1" processRef="Process_1" />
  </bpmn:collaboration>
  <bpmn:process id="Process_1" isExecutable="false" />
  <bpmndi:BPMNDiagram id="BPMNDiagram_1">
    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Collaboration">
      <bpmndi:BPMNShape id="Participant_1_di" bpmnElement="Participant_1" isHorizontal="true">
        <dc:Bounds x="0" y="0" width="600" height="250" />
      </bpmndi:BPMNShape>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</bpmn:definitions>

Here is what I see originally, which is expected

Then on running the following commands in the console

cli.elements() // ['Collaboration', 'Participant_1']
cli.create('bpmn:Participant', '0,300', 'Collaboration')

I get this in the diagram, where the participant seems to be incorrectly diagrammed

On viewing the current XML:

<?xml version="1.0" encoding="UTF-8"?>
<bpmn:definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL"
    xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"
    xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" id="Definitions_1"
    targetNamespace="http://bpmn.io/schema/bpmn">
    <bpmn:collaboration id="Collaboration">
        <bpmn:participant id="Participant_1" processRef="Process_1" />
        <bpmn:participant id="Participant_1i4u98a" />
    </bpmn:collaboration>
    <bpmn:process id="Process_1" isExecutable="false" />
    <bpmndi:BPMNDiagram id="BPMNDiagram_1">
        <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Collaboration">
            <bpmndi:BPMNShape id="Participant_1_di" bpmnElement="Participant_1" isHorizontal="true">
                <dc:Bounds x="0" y="0" width="600" height="250" />
            </bpmndi:BPMNShape>
            <bpmndi:BPMNShape id="Participant_1i4u98a_di" bpmnElement="Participant_1i4u98a"
                isHorizontal="true">
                <dc:Bounds x="-200" y="270" width="400" height="60" />
            </bpmndi:BPMNShape>
        </bpmndi:BPMNPlane>
    </bpmndi:BPMNDiagram>
</bpmn:definitions>

We can see that it has created a participant in the collaboration element, but it has not created a new process and linked to it. I'm not sure how we can achieve that through the CLI as well.

[nikku]

@dkapur17 Please use the existing issue templates, to provide full context of what you want to accomplish. Only then we'll be able to handle your request.

[dkapur17]

Hey @nikku, updated the issue to follow the template.

[nikku]

From what I understand you want to create a second process, within a collaboration diagram. A process, inside a collaboration diagram, is represented ("wrapped") in a participant. We don't seem to support this at the moment. Neither can we blindly attach a process to any newly created participant (as an "empty pool") is a very valid BPMN construct.