code: public String getConfigurationOptionValue (String optionName, String defaultValue) {
  		String optionValue;
  		Node configurationOption = this.getConfigurationOption (optionName);
  		if (configurationOption != null) {
  			optionValue = configurationOption.getTextContent ();
  		} else {
  			optionValue = defaultValue;
  		}
  		return optionValue;
  	}
docs: Get a configuration option value as String.
  @param optionName
  @param defaultValue
  @return The configuration option node value, or <code>defaultValue</code> if it does not exist