Determines whether a value entered in a form is valid. Validation rules are evaluated whenever the form is submitted.
This example Validation rule checks to make sure that a user’s zip code is five digits.
<Validation>
<cond>
<and>
<eq><length><ref>global.zipcode</ref></length>
<i>5</i>
</eq>
<gt><ref>global.zipcode</ref><i>99999</i></gt>
</and>
<null/>
<s>zip codes must be five digits long</s>
</cond>
</Validation>
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