code: @Deprecated
      protected static byte[] nodeToByte(Node node) throws PolicyIndexException {
          ByteArrayOutputStream out = new ByteArrayOutputStream();
          Writer output = new OutputStreamWriter(out, Charset.forName("UTF-8"));
  
          try {
              SunXmlSerializers.writePrettyPrintWithDecl(node, output);
              output.close();
          } catch (IOException e) {
              throw new PolicyIndexException("Failed to serialise node " + e.getMessage(), e);
          }
          return out.toByteArray();
      }
docs: get XML document supplied as w3c dom Node as bytes
  
  @param node
  @return
  @throws PolicyIndexException