public void buildInterfaceSummary() {
                ClassDoc[] interfaces =
                        packageDoc.isIncluded()
                                ? packageDoc.interfaces()
                                : configuration.classDocCatalog.interfaces(
                                        Util.getPackageName(packageDoc));
                if (interfaces.length > 0) {
                        packageWriter.writeClassesSummary(
                                interfaces,
                                configuration.getText("doclet.Interface_Summary"));
                }
        }