code: public void appendXMLToContentEntry(final XMLUtil util,
                                          final Appendable appendable) throws IOException {
          this.appendPreamble(util, appendable);
          this.appendRows(util, appendable);
          this.appendPostamble(appendable);
      }
docs: Add XML to content.xml
  @param util an util
  @param appendable the output
  @throws IOException if the XML could not be written