docs: public void setStringValue(CmsObject cms, String name, Locale locale, String content) throws CmsXmlException {
  
          CmsXmlHtmlValue value = (CmsXmlHtmlValue)getValue(name, locale);
  
          if (value != null) {
              // set the values
              value.setStringValue(cms, content);
          } else {
              throw new CmsXmlException(
                  Messages.get().container(Messages.ERR_XML_PAGE_INVALID_ELEM_SELECT_2, locale, name));
          }
      }