I have an Xml document of which parts need to be Hashed for signature.

To get xml subtree I use Namespace aware Document outdocp

XPath xpath = XPathFactory.newInstance().newXPath();
XPathExpression expr = xpath.compile("/EDoc/Signature/Object/QualifyingProperties/SignedProperties");
Node spNode = (Node) expr.evaluate(outdocp, XPathConstants.NODE);

But the results spNode children whose prefix is ds are missing xmlds::ds namespace

Online tool xpather.com correctly adds this namespace

xpather.com

Tried setting

                xpath.setNamespaceContext(new NamespaceContext() {
                    @Override
                    public String getNamespaceURI(String s) {
                        if (s.equals("ds")) {
                            return "http://www.w3.org/2000/09/xmldsig#";
                        } else if (s.equals("xades")) {
                            return "http://uri.etsi.org/01903/v1.3.2#";
                        } else if (s.equals("xades141")) {
                            return "http://uri.etsi.org/01903/v1.4.1#";
                        }

                        return XMLConstants.NULL_NS_URI;
                    }

                    @Override
                    public String getPrefix(String s) {
                        return null;
                    }

                    @Override
                    public Iterator<String> getPrefixes(String s) {
                        return null;
                    }
                });

it didnt help