Extract subxml from xml

Just a method to extract Sub - XML from XML using XPath in Java


public String extractResponseData(String responseXML) throws IOException, SAXException, ParserConfigurationException, XPathExpressionException, TransformerException {

XPathExpression expr = XPathFactory.newInstance().newXPath().compile("//responsedata/*");
InputSource inputSource = new InputSource(new ByteArrayInputStream(responseXML.getBytes()));
NodeList nodeList = (NodeList) expr.evaluate(inputSource, XPathConstants.NODESET);
StringWriter sw = new StringWriter();
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
transformer.transform(new DOMSource(nodeList.item(0)), new StreamResult(sw));
return sw.toString();
}