@JonathanGregory, thanks for the feedback.  Your help with the wording is 
appreciated.

I thought the term "functional attributes" might be understood from context.  I 
was looking for a short collective term that means "attributes that are 
functionally active in the CF interpretation of the variable".

On review, I notice that the original sentence in CF-1.8 is kind of puzzling in 
its own way.

> Boundary variable attributes which determine the coordinate type (units, 
> standard_name, axis and positive) or those which affect the interpretation of 
> the array values (units, calendar, leap_month, leap_year and month_lengths) 
> must always agree exactly with the same ...

Is it appropriate here to explain distinction between the first and second 
groups?  What is the best way to describe the general intention here, yet try 
to remain concise?

For the purpose of this section, I think we only care about indicating which 
attributes are significant in some way to CF interpretation and processing.  
Let me tentatively merge the two groups, because the distinction may not be 
locally relevant, and try this simplified wording without "functional":

> Boundary variable attributes which are significant to CF interpretation 
> (units, standard_name, axis, positive, calendar, leap_month, leap_year and 
> month_lengths) must always agree exactly with the same ...

Do you like this, or have another suggestion?

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