[Zope] servlet filter like behaviour

Hello, How it is possible to wrap the response of a subtree? For example, for the path /foo/bar/baz, a script located at /foo/wrapper would catch the output of the rest of the request path (./bar/baz) and do a transformation upon it (gzip, xslt, etc). Thank you, -- Laurian Gridinoc, www.grapefruit.ro