log:notIncludes

Formulas are just sets of triples, so we can test for what is not contained.

If someone's page does not say they are vegetarian, let's assume they are an omnivore:

this log:forAll :x.
{:x :homePage log:notIncludes 
                  { :x a :Vegetarian }}
=> { :x a :Omnivore }. 

Of course, using defaults like this often gives wrong results

...but sometimes it's still your best option.