Yes, that might be a good way to encode the information. What I wanted to say 
is this: I find it very plausible that in a national weather service a group 
sits together and decides to code their station data using variable names 
`tas_station-name` with a number of non ascii letters in the station names. 
Furthermore, that would appear to be perfectly valid CF.

So I think being more explicit about what is meant by "letter" would be good, 
even if that means saying that only ascii letters are allowed.

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