There seems to be a contradiction creeping in between the 
aggregate_quality_flag definition and Jessica's answers to Alison's questions. 
The answers indicate a move towards a generic position in which the component 
parts of the aggregate are a moveable feast. 

However, the definition includes a prescription of the algorithm to be used for 
the synthesis of the component flag values. Would it not be possible for 
another user of the Standard Name to have an algorithm that applied weightings 
to the different components. That is why Nan was objecting to  the phrase 'set 
to the highest-level (worst case) flag found'.

So I think you need to take one final step down the road to a generic 
aggregate_quality_flag. Maybe something like:

This flag is an algorithmic combination of the results of all relevant quality 
tests run for the related ancillary parent data variable. The linkage between 
the data variable and this variable is achieved using the ancillary_variables 
attribute. The aggregate quality flag provides a summary of all quality tests 
performed on the data variable (both automated and manual) whether present in 
the dataset as independent ancillary variables to the parent data variable or 
not.


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