I make a custom validator myDate
I try to give as var value the day and the month,
but when I try to get the values of the vars day and month,
I get the String literals birthDay and birthMonth
<field property="birthDay"></field>
<field property="birthMonth"></field>
<field property="birthYear" depends="myDate">
<arg name ="date" key="invalid.date"/>
<var>
<var-name>day</var-name>
<var-value>birthDay</var-value>
</var>
<var>
<var-name>month</var-name>
<var-value>birthMonth</var-value>
</var>
</field>
