For horizontal coordinates, the CF `axis` attribute should be used to indicate which axis is `X` and which `Y`, where `X` is "like" longitude and `Y` "like" latitude. This correspondence can't really be more than a rough guide, for reasons mentioned above. Doesn't the `axis` attribute meet the need? I don't think we need to introduce anything new to describe a CRS. We know that CF metadata isn't arranged the same way as OGC metadata, since the data model is different, but so long as we can translate, I think that should be OK.
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