@martinjuckes, [CF section 
2.3](http://cfconventions.org/Data/cf-conventions/cf-conventions-1.8/cf-conventions.html#_naming_conventions)
 says:

> Variable, dimension, attribute and group names should begin with a letter and 
> be composed of letters, digits, and underscores.`

However, your opening statement seems to contradict:

> The CF Convention does not impose any restrictions on the character set used 
> in variable and attribute names.

What is your interpretation?  Is section 2.3 advisory only, or did you miss 
that?

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