Dear @zklaus 

> We don't have to distinguish positive and negative categories, because they 
> are logically related: prohibition = negative requirement, deprecation = 
> negative recommendation.

Sorry to be unclear. I meant by this to explain that the conformance document 
has only two categories, viz. recommendation and requirement, and that we don't 
need to have deprecation and prohibition as two more, because a prohibition is 
a kind of requirement and a deprecation is a kind of recommendation. Does that 
make sense?

I agree it is possible that we should remove some features when there is an 
alternative better way, but I think there has to be a strong case for it. 
Personally, being mostly a data-analyst and data-producer, I think we should 
favour making it attractive and easy for data-readers and data-writers to use 
the conventions (correctly, of course, and not carelessly), even if that makes 
a bit more work for authors of software. That is because writers of widely used 
software are generally software experts, whereas producers and analysts of data 
are generally not software experts.

Again I would suggest that a helpful way to proceed would be to identify any 
current deprecations (recommendations against doing things) in the conformance 
or conventions document where there could be a strong case for removing some 
feature in future. Then we will see how large an issue it is, which will help 
us to decide how to deal with it.

Best wishes

Jonathan

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