If you find that you can't do what you need with the standard tools, ask yourself if you can do what you need with a custom code element.

Listing 11 USES the value of col2 as a parameter to restrict DELETE operations based on the value of an XML element (the zip or zip code element of a client's address).

When you create such an element, the visualization engine looks into only the code element that is selected and to its immediately related elements.