Hi, I'm using mxmRelations (no, the problem isn't with that product) so I can track relations between various objects (companies, proposals, projects). I defined some macros in zpt in order to, e.g., show a table of all proposals in the proposals folder and reuse that macro to show all proposals related to a company when I'm showing the company. Inside the tabular data for each proposal I show the company id and a link: e.g.: ("item" is the loop variable and is my object for proposal, and has ha method "getClient" which wraps an mxmRelation and returns an object, the company, or None) <td tal:define="client item/getClient"> <span tal:condition="client" tal:replace="default"> <a href="somewhere" tal:attributes="href client/absolute_url" tal:content="client/id">Client</a> </span> <span tal:condition="not: client" tal:replace="default"> <font color="red">not defined</font> </span> </td> All was working fine while I was using the macro inside the "proposals" folder, but when I tried to use it inside a company I got a recursion depth error. It turns out that I didn't assimilate yet all the documentation ;-) and, after many desperate attempts to understand what was going wrong, I realized that path expressions will render the content of the page, so obviously inside the company trying to render the same company would cause a recursion error. At first I changed the tal:define="client item/getClient" with tal:define="client python:item.getClient()" but that gave the same error. So I changed the tal:define="client item/getClient" to tal:define="client nocall:item/getClient" This solved the recursion problem but now I could not use "client/id" and "client/absolute_url" (and permutations like "python:client.getId()" and "python:client.absolute_url()"). I solved my problem by defining two more methods in my class (getClientId and getClientUrl). I'm not satisfied with this solution and I still don't understand why I could access attributes and methods of a rendered page and could not do that with the raw object. Besides, even if it's not causing a recursion depth exception, there are other sites where I'm using similar macros and I don't like the idea of causing a page to render just to show the id and a link. Bye -- Luca Olivetti Wetron Automatización S.A. http://www.wetron.es/ Tel. +34 93 5883004 Fax +34 93 5883007