docs: public static Object executeXPath(Node document, String xpathExpression, Map<String, String> namespaceMapping, QName result)
                  throws XPathException, MarshallingException
      {
          NamespaceMapContext mapContext = new NamespaceMapContext(namespaceMapping);
          try
          {
              XPathFactory xPathfactory = XPathFactory.newInstance();
              XPath xpath = xPathfactory.newXPath();
              xpath.setNamespaceContext(mapContext);
              XPathExpression expr = xpath.compile(xpathExpression);
  
              return executeXPath(document, expr, result);
          }
          catch (XPathExpressionException e)
          {
              throw new XPathException("Xpath(" + xpathExpression + ") cannot be compiled", e);
          }
          catch (Exception e)
          {
              throw new MarshallingException("Exception unmarshalling XML.", e);
          }
      }