Structural transformations
You may find that the physical structure of your code (e.g. the package hierarchy) does not conform directly to the way that you understand the architecture - perhaps several packages correspond to a single architectural component, or the contents of a single package map to several architectural components.
Or, you may wish to see how various packages or classes that are distributed across the package hierarchy relate to each other.
Structure101 supports you in this type of situation by providing a simple but powerful regular-expression notation from which you can define structural transformations.
For more details on how to use structure101's Transformations check out the structure101 online help.