code: def parse_workflow_messages(self):
          
          if 'client_message' in self.current.spec.data:
              m = self.current.spec.data['client_message']
              self.current.msg_box(title=m.get('title'),
                                   msg=m.get('body'),
                                   typ=m.get('type', 'info'))
docs: Transmits client message that defined in
          a workflow task's inputOutput extension
  
         .. code-block:: xml
  
              <bpmn2:extensionElements>
              <camunda:inputOutput>
              <camunda:inputParameter name="client_message">
              <camunda:map>
                <camunda:entry key="title">Teşekkürler</camunda:entry>
                <camunda:entry key="body">İşlem Başarılı</camunda:entry>
                <camunda:entry key="type">info</camunda:entry>
              </camunda:map>
              </camunda:inputParameter>
              </camunda:inputOutput>
              </bpmn2:extensionElements>