code: public void buildClassSummary(XMLNode node, Content summaryContentTree) {
          String classTableSummary =
                  configuration.getText("doclet.Member_Table_Summary",
                  configuration.getText("doclet.Class_Summary"),
                  configuration.getText("doclet.classes"));
          List<String> classTableHeader = Arrays.asList(configuration.getText("doclet.Class"),
                  configuration.getText("doclet.Description"));
          SortedSet<TypeElement> clist = utils.isSpecified(packageElement)
              ? utils.getTypeElementsAsSortedSet(utils.getOrdinaryClasses(packageElement))
              : configuration.typeElementCatalog.ordinaryClasses(packageElement);
          SortedSet<TypeElement> classes = utils.filterOutPrivateClasses(clist, configuration.javafx);
          if (!classes.isEmpty()) {
              packageWriter.addClassesSummary(classes,
                      configuration.getText("doclet.Class_Summary"),
                      classTableSummary, classTableHeader, summaryContentTree);
          }
      }
docs: Build the summary for the classes in this package.
  
  @param node the XML element that specifies which components to document
  @param summaryContentTree the summary tree to which the class summary will
  be added