code: def export_data_object_info(bpmn_diagram, data_object_params, output_element):
          
          output_element.set(consts.Consts.is_collection, data_object_params[consts.Consts.is_collection])
docs: Adds DataObject node attributes to exported XML element
  
          :param bpmn_diagram: BPMNDiagramGraph class instantion representing a BPMN process diagram,
          :param data_object_params: dictionary with given subprocess parameters,
          :param output_element: object representing BPMN XML 'subprocess' element.