[Zope] Traversal Product Dev Question

Traversal Question... I have a url: /consultants/directory/chris 'directory' is currently a folderish zclass chris is the key to a record in a database I would like 'directory' to be "smart" enough to take chris and look it up in the database and return index_html with the request filled out with table fields. Is this possible? I am trying to AVOID adding any other URL elements and changing 'directory' to anything other than folderish. I know that 'directory' may need to be changed to a python product. Is there some method that gets called while trying to resolve a url parameter? I remember something about a method to override like 'has_attr" or something. Chris