code: private void removeUndefinedOperations(Node target, Node extensions) throws Exception {
          final XPathFactory factory = XPathFactory.newInstance();
          final NodeList nodes = (NodeList) factory.newXPath().evaluate("//operation", target, XPathConstants.NODESET);
          for (int i = 0; i < nodes.getLength(); i++) {
              final Node targetNode = nodes.item(i);
              String nameBasedXpath = DomUtils.getNameBasedXPath(targetNode, true);
              log.debug("Checking operation: " + nameBasedXpath);
  
              final NodeList targetNodes = (NodeList) factory.newXPath().evaluate(nameBasedXpath, extensions, XPathConstants.NODESET);
              if (targetNodes.getLength() == 0) {
                  // This operation is not defined in the extensions doc
                  log.debug("Ignoring IDL defined operation: " + getAttribute(targetNode, "name"));
                  targetNode.getParentNode().removeChild(targetNode);
              }
          }
      }
docs: Cycle through the target Node and remove any operations not defined in the extensions document.