public function merge(&$anotherMIObj)
    {
        $old_varValue = $this->varValue;
        $this->varValue = array();
        foreach ($anotherMIObj as $key => $value) {
            if (!$old_varValue[$key]) {
                $this->varValue[$key] = $value;
            } else {
                $this->varValue[$key] = $old_varValue[$key];
            }
        }
        foreach ($old_varValue as $key => $value) {
            if (!isset($this->varValue[$key])) {
                $this->varValue[$key] = $value;
            }
        }
    }