code: public String readInternProp() {
  
          boolean internProp = false;
          try {
              internProp = getCms().readResource(getParamResource(), CmsResourceFilter.IGNORE_EXPIRATION).isInternal();
          } catch (CmsException e) {
              if (LOG.isInfoEnabled()) {
                  LOG.info(e.getLocalizedMessage());
              }
          }
          return String.valueOf(internProp);
      }
docs: Returns value of the the intern property of the resource.<p>
  
  @return the value of the intern property of the resource