[BIONT-DSE] Inclusion versus exclusion criteria

[Alan Ruttenberg]

Something that I remain confused about is why there are two  
categories of criteria, when, on the face of it, the negation of an  
exclusion criterion is an inclusion criterion.

So I'm wondering, is there something between the lines? Is there  
something other than the negation? Perhaps kind of criteria, or  
lesser necessity, or derivation from different sources? Open versus  
closed world? Otherwise, from a technical point of view can we just  
consider these the the same sort of thing, with a flag indicating how  
they should be shown in a hypothetical user interface?

-Alan