docs: static XmlConfigurator getXmlConfigurator(String properties) throws IOException {
          XmlConfigurator returnValue=null;
          InputStream configStream=getConfigStream(properties);
          if(configStream == null && properties.endsWith("xml"))
              throw new FileNotFoundException(String.format(Util.getMessage("FileNotFound"), properties));
  
          if (configStream != null) {
              checkJAXPAvailability();
              returnValue=XmlConfigurator.getInstance(configStream);
          }
  
          return returnValue;
      }