code: private static void inlineSvgNodes(final Document doc, final String basePath) {
          try {
              // handle null inputs
              if (doc == null) return;
  
              final String fixedBasePath = basePath == null ? "" : basePath;
  
              final List<Node> nodes = XMLUtilities.getChildNodes(doc.getDocumentElement(), "object");
              for (final Node node : nodes) {
                  final NamedNodeMap attributes = node.getAttributes();
  
                  final Node typeAttribute = attributes.getNamedItem("type");
                  final Node dataAttribute = attributes.getNamedItem("data");
  
                  if (typeAttribute != null && typeAttribute.getTextContent().equals("image/svg+xml") && dataAttribute != null) {
                      final String data = dataAttribute.getTextContent();
                      final File dataFile = new File(fixedBasePath + "/" + data);
                      if (dataFile.exists()) {
                          final String fileString = FileUtilities.readFileContents(dataFile);
                          final Document svgDoc = XMLUtilities.convertStringToDocument(fileString);
  
                          if (svgDoc != null) {
                              final Element svgDocElement = svgDoc.getDocumentElement();
                              if (svgDocElement != null && svgDocElement.getNodeName().equals("svg")) {
                                  final Node parent = node.getParentNode();
                                  if (parent != null) {
                                      final Node importedNode = doc.importNode(svgDocElement, true);
                                      parent.replaceChild(importedNode, node);
                                  }
                              }
                          }
                      }
                  }
              }
          } catch (final Exception ex) {
              LOG.error("Unable to convert external SVG image to DOM Document", ex);
          }
      }
docs: Finds any reference to an external SVG image and replaces the node with
  the SVG inline data.
  
  @param doc      The document that holds the XHTML
  @param basePath The base path where the SVG images can be found