code: public String buildInputNotificationInterval() {
  
          String propVal = null;
          if (!isMultiOperation()) {
              try {
                  propVal = getCms().readPropertyObject(
                      getParamResource(),
                      CmsPropertyDefinition.PROPERTY_NOTIFICATION_INTERVAL,
                      false).getValue();
              } catch (CmsException e) {
                  if (LOG.isInfoEnabled()) {
                      LOG.info(e.getLocalizedMessage());
                  }
              }
          }
          if (CmsStringUtil.isEmpty(propVal)) {
              propVal = "";
          }
          StringBuffer result = new StringBuffer();
  
          result.append("<input class=\"maxwidth\" type=\"text\" name=\"");
          result.append(CmsAvailability.PARAM_NOTIFICATION_INTERVAL);
          result.append("\" value=\"");
          result.append(propVal);
          result.append("\">");
          return result.toString();
      }
docs: Creates an input field for the notification interval.<p>
  
  @return HTML code for the notification interval input field.