@davidhassell I think there is some level on which the checker needs to get 
involved. It needs to check consistency in the **`grid_mapping`** attribute 
string - verifying that the CRS (grid mapping) variables exist and the variable 
names associated with each CRS variable exist and have matching dimensionality. 
The checker could even verify that the variables associated with a given CRS 
represent a proper set using standard names and/or units. None of this would 
require parsing the WKT string.

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