private function wrapEntry($entry, $fileMimeType)
    {
        $wrappedEntry = "--{$this->_boundaryString}\r\n";
        $wrappedEntry .= "Content-Type: application/atom+xml\r\n\r\n";
        $wrappedEntry .= $entry;
        $wrappedEntry .= "\r\n--{$this->_boundaryString}\r\n";
        $wrappedEntry .= "Content-Type: $fileMimeType\r\n\r\n";
        return new Zend_Gdata_MimeBodyString($wrappedEntry);
    }