What is meaning of droneEnumValue 78

To whom may concern about it.

Hello, Today I have the some of the questions about droneEnumValue in wpml.
We have tried to export kmz file on DJI DeliveryHub, then we did find out the droneEnumValue and payloadEnumValue on wpml unzip from the kmz file.
So I wonder if droneEnumValue will be meaning of DJI Fly Cart 30. But We cannot know it is meaning of DJI Fly Cart 30, because of what is not on developer.dji.com web page.

https://developer.dji.com/doc/cloud-api-tutorial/en/api-reference/dji-wpml/common-element.html

Questions:

1. What is the meaning of droneEnumValue 78?

2. what is the meaning of payloadEnumValue 39?

Best Regards.