OpenRA

.

Thank you for your links.

Strange thing. I have read here right now.

"TutorialsPoint - YAML Basics "
-https://www.tutorialspoint.com/yaml/yaml_basics.htm

"YAML does not allow the use of tabs while creating YAML files; spaces are allowed instead"

???
There are only tabs in the OpenRa yaml file... Do I understand something wrong?

That is because OpenRA's yaml is not "real" yaml but "miniyaml", the extension is a bit confusing. Using tabs is the correct way when dealing with OpenRA's "yaml" files.