[Zope] Create a list in the REQUEST space ????

Help!, We are trying to load user roles from a table. roles needs to be a list so that the manage_users call can set the roles. The question is how does one create a list on the fly in the REQUEST Space...? The below snippet does not create the list, any thoughts??? //snippet <dtml-in getUserRoles> <dtml-call "REQUEST.set('roles:list',name)"> </dtml-in> <dtml-call "acl_users.manage_users(submit='Add', REQUEST=REQUEST)"> Thanks, DR