example: "Open Source Enterprise Search Server: Fess — Fess 11.0 documentation"
                        content_title:
                          type: string
                          example: "Open Source Enterprise Search Server: Fess — Fe..."
                        digest:
                          type: string

        }).orElse(() -> fail());
        LabelType[] labelTypes = parser.getLabelTypes();
        assertEquals(3, labelTypes.length);
    }

    public void test_escape() {
        // https://www.google.com/support/enterprise/static/gsa/docs/admin/70/gsa_doc_set/admin_crawl/url_patterns.html#1076127
        assertEscapePattern("", "# Test");
        assertEscapePattern(".*\\Q!/\\E.*", "!/");
        assertEscapePattern("\\Qindex.html\\E", "index.html");