Then you can for example calculate a classification consisting of all the participants in a certain composite pattern. You can keep the intentional classification as it is, or convert it to an extentional classification. This makes it easier to remove or add singular items to it. If you keep it as an intentional classification you can recalculate it, for example to bring it up to date with a changed implementation. Double clicking them lists their items.
Classifications can contain anything.
This makes it for example really easy to add a specific labeler that shows classes belonging to your applications or parcels in a specific color, or all abstract classes in red, or shows the number of methods of a class etc.etc.etc when you click on an item in the tree view, an editor for that item is displayed. For example, clicking an object opens an inspector on that object. Clicking on a class or a method opens an appropriate browser and clicking a classification opens a LCB on the selected classification. That lists all the registered actions and their visitors. One uses the standard VW browsers to edit classes or methods, the other one uses the Refactoring Browser editors.