<form name="formname">
<field property="age" depends="required,maxlength,minlength">
<arg0 key="formname.age"/>
<arg1 name="maxlength" key="${var:maxlength}" resource="false"/>
<arg2 name="minlength" key="${var:minlength}" resource="false"/>
<var>
<var-name>maxlength</var-name>
<var-value>50</var-value>
</var>
<var>
<var-name>minlength</var-name>
<var-value>18</var-value>
</var>
</field>
<field property="Email" depends="required,email">
<arg0 key="formname.email"/>
</field>
</form>