private function addOperatorToChange(&$changes,$operator,$kvp)
    {
        if (!isset($changes[$operator]) || !is_array($changes[$operator]))
        {
            $changes[$operator] = array();
        }
        foreach($kvp as $key=>$value)
        {
            if (isset($changes[$operator][$key]))
            {
                $value = array_merge($value,$changes[$operator][$key]);
            }
            $changes[$operator][$key] = $value;
        }
    }