code: public void buildInterfaceSummary(XMLNode node, Content packageSummaryContentTree) {
          String interfaceTableSummary =
                  configuration.getText("doclet.Member_Table_Summary",
                  configuration.getText("doclet.Interface_Summary"),
                  configuration.getText("doclet.interfaces"));
          String[] interfaceTableHeader = new String[] {
              configuration.getText("doclet.Interface"),
              configuration.getText("doclet.Description")
          };
          ClassDoc[] interfaces = pkg.interfaces();
          if (interfaces.length > 0) {
              profileWriter.addClassesSummary(
                      interfaces,
                      configuration.getText("doclet.Interface_Summary"),
                      interfaceTableSummary, interfaceTableHeader, packageSummaryContentTree);
          }
      }
docs: Build the summary for the interfaces in the package.
  
  @param node the XML element that specifies which components to document
  @param packageSummaryContentTree the tree to which the interface summary
  will be added