[Zope] How do I convert an id to a string?

This may be a simple problem but I tried all I could yesterday, I browsed the docs quickly and could not find the answer: I want to use the id of a object as a string in an expression and I can't find how to convert/extract the string representation of the id. I want to write some code like this: <dtml-comment>Do not show backup files</dtml-comment> <dtml-in "objectValues(['DTML Document'])"> <dtml-if "_.string.rfind(id, '~') != -1"> ^^^^^^^^^^^^^^^^^^^^^^^ <LI><A HREF="<dtml-var "absolute_url()">"><dtml-var title_or_id></A> </dtml-if> </dtml-in> What should I put in this expression in the place of 'id'? Thanks -- Farzad FARID <farzy@via.ecp.fr> Ingénieur Informatique Libre Alcôve - http://www.alcove.fr/