protected function getCombinedXML($innerXML)
    {
        // Determine start and end tags from configuration:
        $start = $this->wrappingTag;
        $tmp = explode(' ', $start);
        $end = '</' . str_replace(['<', '>'], '', $tmp[0]) . '>';

        // Assemble the document:
        return $start . $innerXML . $end;
    }