protected void navSummaryLinks() throws Exception {
        printText("doclet.Summary");
        space();
        MemberSummaryBuilder memberSummaryBuilder = (MemberSummaryBuilder)
            configuration.getBuilderFactory().getMemberSummaryBuilder(this);
        writeNavSummaryLink(memberSummaryBuilder,
            "doclet.navAnnotationTypeRequiredMember",
            VisibleMemberMap.ANNOTATION_TYPE_MEMBER_REQUIRED);
        navGap();
        writeNavSummaryLink(memberSummaryBuilder,
            "doclet.navAnnotationTypeOptionalMember",
            VisibleMemberMap.ANNOTATION_TYPE_MEMBER_OPTIONAL);
    }