Dear @snowman2 
That's good about `proj` supporting those two projections. Thanks.
I used `proj` as an example but I was really thinking more about the general 
point that Jim raised, about relying on external resources. We've often 
discussed this on the former CF email list. I understand from what you say that 
`proj` is software, rather than a conventions document, so that's a bit 
different. You're right of course that open-source software can be modified by 
anyone for their own use. However, if someone proposes a new `grid_mapping` in 
CF, they just want the document to be modified, and they would not be offering 
to modify `proj` software to support this new mapping.
Best wishes
Jonathan

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