Hi everyone !

I would like to know if there is a rule or a best practice for a raster file's metadata key to be written in upper or lower case ?

 I read https://gdal.org/user/raster_data_model.html#metadata and saw that "/The names are required to be well behaved tokens (no spaces, or odd characters//)./" but I didn't read anything about upper vs lower cases. While I see examples of both (upper and lower case) in different valid files, I would like to know if a documented recommendation exists ?

Thanks

LP
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