How to define positive AND negative depth on taxonomy filter in views' module? I am looking for a way to have an exposed filter in a view, based on the option "has taxonomy terms with depth", that can look for a term in a positive and a negative depth.

An example : I want that when "EUROPE" is selected, all contents that have "WORLD" or "SPAIN" "ENGLAND" Show-up in the results.

Does anyone has an idea ?

Thank you in advance.
I've done stuff like this (eg, World and nesting of regions in the world with heirarchical taxonomies).

Take a look at Taxonomy Edge. It provides view integrations to provide search filters for "Taxonomy edge: Parent term ID" and I believe "Taxonomy edge: Parent term has child term". I mean it adds some useful parent and child Views search filters (I dont believe it adds a single positive or negative search as you've described).