buf.append(",\"start_record_number\":");
            buf.append(startRecordNumber);
            buf.append(",\"end_record_number\":");
            buf.append(escapeJson(endRecordNumber));
            buf.append(",\"page_numbers\":");
            buf.append(escapeJson(pageNumbers));
            buf.append(",\"partial\":");
            buf.append(escapeJson(partial));