code: public void buildSummary(XMLNode node, Content packageContentTree) {
          Content summaryContentTree = packageWriter.getSummaryHeader();
          buildChildren(node, summaryContentTree);
          packageContentTree.addContent(summaryContentTree);
      }
docs: Build the package summary.
  
  @param node the XML element that specifies which components to document
  @param packageContentTree the package content tree to which the summaries will
  be added