docs: public static String convertDocumentToDocBookFormattedString(final DocBookVersion docBookVersion, final Document doc,
              final String elementName, final String entityName, final XMLFormatProperties xmlFormatProperties) {
          final String formattedXML = convertDocumentToFormattedString(doc, xmlFormatProperties);
          return addDocBookPreamble(docBookVersion, formattedXML, elementName, entityName);
      }