BEFORE_EQUAL takes two dates, and checks if the first one comes before, or is the same as, the second.



BEFORE_EQUAL(e.date_of_founding, e.date_of_domicile)

This expression checks whether a company was founded before, or a the same time, it gained its current country of domicile. If the expression evaluates to 'true', the company could have been founded in a different country than where it is currently domiciled.