Dear Jonathan,

It was not clear to me whether a **dimension coordinate variable** should be 
considered as a form of **data variable** or a disjoint category of variable, 
so I'm happy to accept your interpretation (I don't think there is anything to 
draw on in NUG). I think there is some inconsistency of usage in the section on 
feature types, where it is insisted that all data variables should have the 
feature type declared in the `featureType` global attribute (in section 9.4 -- 
section 9.1 has different phrasing: that all features should have the declared 
`featureType`). 

There is a slight problem, I think, with Appendix A and the **Use** column: 
this column uses `C` for dimension coordinate variable and `D` for variables 
containing non-coordinate data, but usage in the examples of the convention and 
the CF checker suggests that the intention is that `D` should stand for 
variables which are neither **dimension coordinate variables** nor **grid 
mapping variables**. Do you have a better interpretation of Appendix A?

Martin



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