if (!table) {
            throw new RuntimeException("Section '$title' does not contain a <table> element.")
        }
        if (!table.thead[0]) {
            throw new RuntimeException("Table '$title' does not contain a <thead> element.")
        }
        if (!table.thead[0].tr[0]) {
            throw new RuntimeException("Table '$title' does not contain a <thead>/<tr> element.")
        }
        return table
    }