Hi, supose you have a product with two classes: MyCategory | ---------- MyLink Both classes are CatalogAware. The ideia of this classes is to implement a Directory like yahoo (think about the Yiahw product). Now I start creating my Directory. My classes have a property "active" that I use to activate and deactivate some parts of my Directory. Now I want to search in my Catalog in which I have MyCategory and MyLink instances catalogued. When I do a search I want to retrieve only results with the "active" property "on". This is ease no big deal. But I want to guarante that all PARENTS of a given Mylink are all with active property "on". Yes no big deal, for each result from my search I run trough the getPath(data_record_id) or even PARENTS and check for each Parent if they are all with active==on. Well the problem arises when you have 30 results in your search and all are Mylinks in a directory depth path of 10 category... The search becomes to heavy,i.e, scalability is compromised. I'm thinking I could use the zope security engine to do the active/deactive trick, i.e, when I deactivate one MyCategory I uncheck some security entry, then listing my directory I do a dtml-in with skip-unauthorized, and when I do a search I try to getObject MyLink's results as a anonymous role and then skip_unauthorized. I think this skip_unauthorized could be the solution for this ZCatalog+Directory product scalability, because instead of running trough the PARENTS and check a property, I will be using zope's internal security mecanism. Any hints, Júlio Dinis Silva _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.