Re: XForms Input Validation

> The data type facets are fine for simple constraints, but we
> envisage the need for more complex constraints expressed
> declaratively via some kind of expression language. Sometimes even
> this will be insufficient, and we envisage a means to call out to
> locally executed scripts.
>

There is a good example called PowerForms in www.brics.dk/bigwig. It
does interdependency check amount field, a XML declarative language to
express the constraint and generate pretty good client side Java codes
for validation.

David Li
DigitalSesame