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Technical Bulletin 253September 2006
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| Number | Field | 1st Indicator | 2nd Indicator | Subfield |
|---|---|---|---|---|
| EAN | 024 | 3 | any | ‡a |
| 10-digit ISBN | 020 | blank | blank | ‡a |
| 13-digit ISBN | 020 | blank | blank | ‡a |
Authority and Holdings formats
You can also put both ten- and thirteen-digit ISBNs in field 020 in Authority and Holdings records.
ISBN conversion
OCLC will run a one-time conversion of ISBNs in existing WorldCat records in late 2006, as described below. However, ISBNs in records created after the one-time conversion will not be moved.
Whenever the system creates a field 020, the indicators are blank and the system-generated ISBNs are put in subfield ‡a.
- Each ISBN is put in its own field 020
- Rules for copying non-ISBN data in fields 020:
- 020: Subfield ‡z is not copied to any other field.
- 020: All data following the ISBN in subfield ‡a is copied to any new 020 field. Other subfields are not copied.
- Field 024 is converted only under the following conditions:
- Only the thirteen-digit ISBN will be moved to field 020. All other data is ignored.
- The 1st indicator is "3"
- Subfield ‡a contains a thirteen-digit ISBN with a prefix of "978" or "9791" through "9799"
Summary of OCLC system processing
The two main ISBN conversion actions that OCLC systems will automatically execute are:
- Store ten-digit ISBNs in field 020 ‡a and generate a thirteen-digit ISBN (if not already in the record).
- Store thirteen-digit ISBNs in field 020 ‡a and generate a ten-digit ISBN (if not already in the record).
The two sections below describe the complete set of system processes OCLC will perform.
Conversion
The table below describes the conversion process OCLC will run on WorldCat in late 2006.
| Number | Field | System action |
|---|---|---|
| 10-digit ISBN | 020 ‡a | Generates 13-digit ISBN (if not already in record). |
| 13-digit ISBN (978) | 020 ‡a | Generates 10-digit ISBN (if not already in record). |
| 13-digit ISBN (9791-9799) | 020 ‡a | No system action. |
| 13-digit ISBN (not 978, 9791-9799) | 020 ‡a | No system action (Invalid ISBN). |
| 13-digit ISBN | 020 ‡z | If valid, moves to 020 ‡a and generates 10-digit ISBN (if not already in record). If invalid, no system action |
| 13-digit EAN (978) | 024 indicator 3 | Generates 10- and 13-digit ISBNs (if not already in record). Deletes 024 if it contains only ‡a. |
| 13-digit EAN (9791-9799) | 024 indicator 3 | Generates 13-digit ISBN (if not already in record). |
| 13-digit EAN (not 978, 9791-9799) | 024 indicator 3 | No system action (Number is not a Bookland EAN or ISBN). |
| EAN (not 13 digits) | 024 indicator 3 | No system action (Number is not a Bookland EAN or ISBN). |
After conversion
The table below describes how OCLC systems process ISBNs after the WorldCat conversion in late 2006.
| Number | Field | System action |
|---|---|---|
| 10-digit ISBN | 020 ‡a | Generates 13-digit ISBN (if not already in record). |
| 13-digit ISBN (978) | 020 ‡a | Generates 10-digit ISBN (if not already in record). |
| 13-digit ISBN (9791-9799) | 020 ‡a | No system action. |
| 13-digit ISBN (not 978, 9791-9799) | 020 ‡a | No system action (Invalid ISBN). |
When Connexion generates ISBNs
In Connexion, the appropriate ISBN (if any, see "After conversion" table above) will be generated when you take the following actions:
- Replace Record
- Update Holdings
- Produce and Update Holdings
- Validate
Note: ISBNs will not be generated for Connexion client offline validate commands - Export
Note: In order to export a record with ISBNs in the Connexion client, you must first take the actions listed above before exporting. ISBNs will not be generated if you export a record without taking these actions first.
Deleting ISBNs
If a record contains two ISBNs and you delete one, the system will regenerate the one you deleted and add it to the record. To avoid this situation, delete both ISBNs.
3 OCLC Number Changes in MARC Records
Expansion of OCLC number
Currently, the OCLC control number is a fixed-length, eight-digit number. However, OCLC will soon reach the last eight-digit number. On November 12, 2006, WorldCat records will be able to have nine-digit OCLC numbers. The 100 millionth WorldCat record will be the first nine-digit number.
A sample file of records, some containing nine-digit OCLC numbers, is available on the Product Services Web site:
| Action | |
|---|---|
| 1 | Go to the Product Services Web: http://psw.oclc.org/ |
| 2 | Click Download sample records and reports. |
| 3 | The Records and reports screen appears. |
| 4 | Under Sample Records and Reports, click OCLC Bibliographic records sample file. |
| 5 | The log on screen appears. Type your authorization and password. Click Enter. |
| 6 | The Records and Reports screen appears. Click Download for the file you want. |
Records containing OCLC numbers 1 through 99999999
The table below describes the 001 field in records containing OCLC numbers 1 through 99999999.
| Tag | Byte | Value | Definition |
|---|---|---|---|
| 001 | Control Number (NR) | ||
| 00-02 | ocm | OCLC designation | |
| 03-10 | Record number (Right justified with leading zeros) | ||
| 11 | Blank |
Records containing OCLC numbers 100000000 and higher
The table below describes the 001 field in records containing OCLC numbers 100000000 and higher.
| Tag | Byte | Value | Definition |
|---|---|---|---|
| 001 | Control Number (NR) | ||
| 00-02 | ocn | OCLC designation | |
| 03-11 | Record number |
Field 035
All bibliographic records output from OCLC systems will include the OCLC number from field 001 in field 035:
- The 035 field will appear immediately before the first field greater or equal to 035, ignoring fields 040 and 066.
- Both indicators are blank.
- Subfield ‡a will include the OCLC number as a variable-length numeric string with no leading zeros and preceded by "(OCoLC)". Subfield ‡a will be present in all bibliographic records output from OCLC systems (except Connexion client 1.60).
- Subfield ‡z will include the OCLC number from field 019 for cross-reference records which have been deleted and merged with the present record. Subfield ‡z is repeatable and will not be present in every record.
Example
035 ‡a(OCoLC)198765401
Exporting field 035
Records exported from Connexion browser and CatExpress will contain an automatically-generated 035 field containing the OCLC number.
Records exported from Connexion client 1.60 will not contain an automatically-generated 035 field containing the OCLC number. Connexion client 1.70 (release date: late 2006) will be able to export records with this kind of 035 field.
4 OCLC-MARC Changes
Field 007 changes
After November 12, 2006, uncoded positions in the 007 field will result in fill characters in OCLC-MARC output (previously, they were hyphens).
| Example field | Old output | New output |
|---|---|---|
| c ‡b o ‡d u ‡e g ‡f u | co ugu-------- | co ugu|||||||| |
| h ‡b d ‡d b ‡e g ‡f c--- ‡g c ‡j u | hd bgc---c--u | hd bgc---c||u |
This change will be present in all bibliographic records output from OCLC systems (except Connexion client 1.60).
Transaction code changes
After November 12, 2006, the following transaction code changes will be implemented:
- Transaction codes will be stored only in field 994 (previously, they were stored in Leader byte 22 and field 994).
- Leader byte 22 will always contain value 0 (zero).
This change will be present in all bibliographic records output from OCLC systems (except Connexion client 1.60).
5 Appendix: History of the OCLC Number
Scope
This appendix describes briefly the various forms of OCLC numbers that OCLC has output in OCLC-MARC via subscription and export from various OCLC cataloging services.
OCLC has distributed other records with different kinds of control numbers. The records below are not part of this appendix because they are not WorldCat records.
| Code | Record type |
|---|---|
| oca | OCLC-MARC authority records |
| bip (obsolete) | Book-in Print database records |
| ccd (obsolete) | CatCD original record (both bibliographic and authority) |
| har (obsolete) | Harvard database record |
| pct | PromptCat data record |
| pks (obsolete) | Prism Keying Service record |
Records output prior to June 28, 1981
Prior to June 28, 1981, the OCLC number was distributed in field 001 with the following structure:
| Tag | Byte | Value | Definition |
|---|---|---|---|
| 001 | Control Number (NR) | ||
| 00-03 | ocl7 | OCLC identifier | |
| 11 | Blank |
Example
001 ocl70012345
Note: transaction date
Between June 30, 1980 and June 25, 1983, all output records included the transaction date following the control number in field 001, separated by a blank. Beginning June 26, 1983, the transaction date was moved to field 005 and no longer put in field 001.
Example
001 ocl70012345 800630
Records output between June 28, 1981 and the 100 millionth record in WorldCat
Includes all records output regardless of when the library updated or added the record. Records produced prior to June 28, 1981 but output after that date have the new structure:
| Tag | Byte | Value | Definition |
|---|---|---|---|
| 001 | Control Number (NR) | ||
| 00-02 | ocm | OCLC identifier | |
| 11 | Blank |
Note: See Note: transaction date, above.
| Date | Example field |
|---|---|
| Prior to June 28, 1981 | 001 ocm00123456 800630 |
| After June 28, 1981 | 001 ocm00123456 |
Records output after 100 millionth record in WorldCat
If the OCLC number is greater than 100000000, the following structure will be present:
| Tag | Byte | Value | Definition |
|---|---|---|---|
| 001 | Control Number (NR) | ||
| 00-02 | ocn | OCLC identifier |
Example
001 ocn198765401
Cross reference field
Beginning in December 1979, for every record that is merged to another record, a field 019 (OCLC control number cross-reference) is created. It is added to the retained record and contains the OCLC number of the deleted record. For more information, see Bibliographic Formats and Standards, field 019.
Example
019 ‡a9849497‡a10625879
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