I'm not contributing much to this because GitHub is inexplicably not sending me 
the contributions to this issue. It may have decided for itself that it's 
better for all if I'm kept in the dark!

I feel that the best solution for this would be for CF to maintain a document 
which describes the mapping between CF metadata and WKT, and for conformance to 
this mapping to be checked by the CF-checker. In that way a user could be 
reasonably confident of getting the same result by reading either of them, and 
errors would be identified. I think we already have some documents somewhere 
that are relevant (prepared years ago by Etienne Tourigny).

This would be a non-trivial piece of work but until it is done I don't think we 
can really know what we are missing in the CF attributes what WKT can describe 
and needs to be included in use cases of CF datasets. It could be that CF 
`grid_mapping` attributes could eventually be replaced by WKT, as Jim would 
prefer, but I suspect that there is overlap with other parts of the CF data 
model, which would make this hard. It's certainly worth considering, but I 
think that writing down the mapping is a necessary piece of evidence in 
deciding about that and would therefore be a useful first step.

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