[gdal-dev] Metadata keys in upper or lower case ?

[Rousseau Lambert,Louis-Philippe (ECCC)]

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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