Formal\Form::validateSameas PHP Method

    function validateSameas($sValue, \Formal\Form\Morphology $oMorpho, \Formal\Element $oElement, $sReferencePropName)
    {
        $sReferenceValue = $oMorpho->element($sReferencePropName)->value();
        if ($sValue === $sReferenceValue) {
            return true;
        }
        return "<strong>" . $oElement->option("label") . "</strong> does not match " . $oMorpho->element($sReferencePropName)->option("label") . ".";
    }