[Zope] Executing Z SQL Methods via a URL request

Hi, I have a Z SQL method that requires an “id” value which it users to perform a select statement. I am trying to pass this “id” value via a URL, which calls a DTML method who in turn calls the Z SQL Method. I have been using URL which looks like: http://localhost/getarticle.html?id=23. Getarticle.html contains only one line - <dtml-call testselect> and testselect is the Z SQL method performing the db select. I have tried several different combinations but nothing seems to work. Does anybody know if this is possible and if so what am I doing wrong? Cheers Nick