Dear Mark

I think your proposal makes sense, if you're sure that the variables listed in 
the `grid_mapping` attribute (in the extended form) always correspond to the 
coordinate variables of the OGC CRS, do they? Maybe it's obvious that they must 
be - I'm not familiar with it.

In your text, I think it would be good to say that the order of the variables 
in the `grid_mapping` attribute is significant only if `crs_wkt` is also 
specified, because it doesn't have a meaning for the CF metadata, in which 
order is not defined.

Best wishes

Jonathan


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