Currently, Anybox supports Inclusive filtering. I can search for collections "New York" and "Restaurants" and I will get records that are in either collection. This represents an OR filter. However, I cannot search for records that in both "New York" and "Restaurants" which would filter the set to the intersection of both. This is an AND filter. Both filter types are useful, but when searching through a large set of bookmarks, an exclusion filter will help to narrow things down