I agree with @roy-lowry on having NULL attributes. Given the input by 
@roy-lowry and @JonathanGregory above I am not sure whether this should be 
included or not. If included, another keyword than surface should be used, but 
neither coverage (which is used in many other contexts) is appropriate given 
the variety of data that could fit here. If to be included I think a major 
restructure of conventions is necessary. Although I appreciate clear statements 
on the nature of data which is useful for applications analysing the data 
(supporting such an extension), I also see the issue of backwards 
compatibility. However, backwards compatibility cannot always win, then we get 
stuck. This is however not an issue which I find important enough to challenge 
that position.

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