code: def add_event_definition_element(event_type, event_definitions):
          
          event_def_id = BpmnDiagramGraph.id_prefix + str(uuid.uuid4())
          event_def = {consts.Consts.id: event_def_id, consts.Consts.definition_type: event_definitions[event_type]}
          return event_def
docs: Helper function, that creates event definition element (special type of event) from given parameters.
  
          :param event_type: string object. Short name of required event definition,
          :param event_definitions: dictionary of event definitions. Key is a short name of event definition,
             value is a full name of event definition, as defined in BPMN 2.0 XML Schema.