OGNL書式で当該項目の数式チェックを行います。
記述例を、以下に示します。
<!-- Plain Validator Syntax -->
<validators>
<validator type="fieldexpression">
<param name="fieldName">myField</param>
<param name="expression"><![CDATA[#myCreditLimit > #myGirfriendCreditLimit]]></param>
<message>My credit limit should be MORE than my girlfriend</message>
<validator>
</vaidators>
<!-- Field Validator Syntax -->
<validators>
<field name="myField">
<field-validator type="fieldexpression">
<param name="expression"><![CDATA[#myCreditLimit > #myGirfriendCreditLimit]]></param>
<message>My credit limit should be MORE than my girlfriend</message>
</field-validator>
</field>
</vaidators>