[Zope-dev] automatically doing a Catalog search as part of object traversal...

Say I have a catalog HelpCatalog, with a bunch of documents that have unique IDs. I want to be able to do something like HelpCatalog/by-id/SomeUniqueID and have it return the document SomeUniqueID. Do Catalogs support any sort of Direct Traversal like this? Or am I going to have to do it myself with a mixin class? Thanks, Anthony