issue when trying to get service provider for a project in one particular server

HI,

I am getting an issue when trying to get service provider for a project in one particular server whereas it works fine for another server.

Is there a difference for XPathConstants.NODE between

Node

and

{http://www.w3.org/1999/XSL/Transform}NODE

private static String getServiceProvider(String catalogURI, String paName,String server,String login,String password,HttpClient httpclient) throws InvalidCredentialsException, IOException, XPathExpressionException {
  HttpGet query = new HttpGet(catalogURI);
  query.addHeader("Accept", "application/xml");
  query.addHeader("OSLC-Core-Version", "2.0");
  System.out.println("paName 111111111111 "+paName);
  // Access to the Service Providers catalog
  HttpResponse response = HttpUtil.sendGetForSecureDocument(
            server, query, login, password, httpclient);
  if (response.getStatusLine().getStatusCode() != 200) {
   response.getEntity().consumeContent();
   throw new HttpResponseException(response.getStatusLine().getStatusCode(), response.getStatusLine().getReasonPhrase());
  }
  // Define the XPath evaluation environment
  XPathFactory factory = XPathFactory.newInstance();
  XPath xpath = factory.newXPath();
  String serviceProviderXPath = "//oslc:ServiceProvider[dcterms:title=\""+paName+"\"]/@rdf:about";
  xpath.setNamespaceContext(
    new NamespaceContextMap(new String[]
      {"oslc", "http://open-services.net/ns/core#",
      "rdf", "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
      "dcterms", "http://purl.org/dc/terms/"}));

  // Retrieve the designated Service Provider
  InputSource source = new InputSource(response.getEntity().getContent());
  Node paNode = (Node)(xpath.evaluate(serviceProviderXPath, source, XPathConstants.NODE));
  if (paNode == null) {
   response.getEntity().consumeContent();
   throw new RuntimeException("Unknown Project Area: "+paName);
  }
  return paNode.getTextContent();
 }