@Override
  public void startElement(String uri, String localName, String qName,
      Attributes atts) throws SAXException {
    if ("".equals(uri) || CacheXml.GEMFIRE_NAMESPACE.equals(uri)) {
      uri = CacheXml.GEODE_NAMESPACE;
    }
    super.startElement(uri, localName, qName, atts);
  }
be able to handle no namespace or older namespace
geode-core/src/main/java/org/apache/geode/internal/config/NameSpaceFilter.java