code: 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));
          }
      }
docs: Sets the data of an already existing value.<p>
  
  The data will be enclosed as CDATA within the xml page structure.
  When setting the element data, the content of this element will be
  processed automatically.<p>
  
  @param cms the cms object
  @param name name of the element
  @param locale locale of the element
  @param content character data (CDATA) of the element
  
  @throws CmsXmlException if something goes wrong