[Zope] dtml-if question

Hello, I am looking to search a SQL database for variables that may have been passed by a webform. Basically, when a user submits a userform, there are checkboxes that can or cannot be checked, and I would like to check the results back for the existance of these variables against the SQL database. An example would be... <dtml-in sql_method_that_returns_all_values> <dtml-if <dtml-var important_column_that_may_exist_also_as_a_passed_variable> > Yes, this was passed. <dtml-else> No, it wasn't passed </dtml-if> This is the logic that I am seeking, but I get a syntax error every time I try this. Does anyone out there have any suggestions? Jason