code: public void createEmptyElements(final ZipUTF8Writer writer) throws IOException {
          this.logger.log(Level.FINER, "Writing empty ods elements to zip file");
          for (final String elementName : EMPTY_ELEMENT_NAMES) {
              this.logger.log(Level.FINEST, "Writing odselement: {0} to zip file", elementName);
              writer.putNextEntry(new ZipEntry(elementName));
              writer.closeEntry();
          }
      }
docs: Create empty elements for package. Used on save or by the ImmutableElementsFlusher.
  
  @param writer destination
  @throws IOException if the elements were not created.