[Zope] how to get the fields returned SQL method

Hello, I'm trying to get a list of fields returned by a dynamic SQL query. I've found a howto telling me to write something like : <dtml-in SQL.names> <dtml-var sequence-item> </dtml-in> But it doesn't work : I get the error "Attribute Error : names". I've tried with .items, .keys and .fields too. I'd like to do the same for an LDAP query. Any idea ? I think it's very useful and that an easy way exists but I can't find it. Thanks, EB.