docs: public void parseCollaboration() {
      Element collaboration = rootElement.element("collaboration");
      if (collaboration != null) {
        for (Element participant : collaboration.elements("participant")) {
          String processRef = participant.attribute("processRef");
          if (processRef != null) {
            ProcessDefinitionImpl procDef = getProcessDefinition(processRef);
            if (procDef != null) {
              // Set participant process on the procDef, so it can get rendered
              // later on if needed
              ParticipantProcess participantProcess = new ParticipantProcess();
              participantProcess.setId(participant.attribute("id"));
              participantProcess.setName(participant.attribute("name"));
              procDef.setParticipantProcess(participantProcess);
  
              participantProcesses.put(participantProcess.getId(), processRef);
            }
          }
        }
      }
    }