yes, sorry to have forgotten about the ticket 85 conclusion. It works for me 
also, is preferable to be inclusive I think.  

john


On Feb 28, 2014, at 10:53, Jim Biard <[email protected]> wrote:

> Hi.
> 
> I think this is perfect!
> 
> Jim
> 
> Visit us on
> Facebook      Jim Biard
> Research Scholar
> Cooperative Institute for Climate and Satellites NC
> North Carolina State University
> NOAA's National Climatic Data Center
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> 
> 
> 
> 
> On Feb 28, 2014, at 1:28 PM, Jonathan Gregory <[email protected]> 
> wrote:
> 
>> Dear John
>> 
>>> "Missing data are permitted in an auxiliary coordinate variable only at 
>>> points where all the referencing variables also have missing data." Trying 
>>> to fix some nits and make it a bit more parseable.
>> 
>> I think that is OK. In case it is not clear what "referencing variables" 
>> means
>> it could be "all the data variables which refer to it".
>> 
>> However, now I look again at ticket 85, which has been agreed already, and 
>> Rich
>> drew our attention to it, I wonder whether we can't just go with that.
>> 
>> "Missing data is allowed in data variables and auxiliary coordinate
>> variables. Generic applications should treat the data as missing where any
>> auxiliary coordinate variables have missing values; special-purpose
>> applications might be able to make use of the data. Missing data is not
>> allowed in coordinate variables."
>> 
>> I guess we must have been through a similar discussion before. The above is
>> more permissive than the words you suggest. It says it's allowed to have
>> missing data in aux coord vars, but if you do that at any points where the
>> data variable is non-missing, the data values there should be ignored i.e.
>> treated as if they were missing.
>> 
>> Is that all right?
>> 
>> Best wishes
>> 
>> Jonathan
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