[Zope] ZCatalog - How to Meta-Type the Relative Path?

hello, i want to add the relative path of my objects to the meta-types of a ZCatalog. how do i do that? i tried "absolute_url", but that's a mess, when you talk to your zope as http://localhost:8080... then the paths include 'localhost'... exporting to a production server would fail. so my personal workaround is: <dtml-var "myCatalog.getpath(data_record_id_)"> but is there another (simpler) solution for my dumb web-designers, who only grasp simple <dtml-var variable> -syntax? by the way: what's the standard 'path'-property in an ZCatalog-Index for? seem's to be always empty... thank u in advance. maik.