docs: public static CmsXmlGroupContainer createDocument(CmsObject cms, Locale locale, String modelUri)
      throws CmsException {
  
          // create the XML content
          CmsXmlGroupContainer content = new CmsXmlGroupContainer(cms, locale, modelUri);
          // call prepare for use content handler and return the result
          return (CmsXmlGroupContainer)content.getHandler().prepareForUse(cms, content);
      }