Technical Bulletin 241: National Library Control Number Changes
ISSN: 1097-9654
November 2000
About Technical Bulletin 241
Why read this?
Record processing information
Important: Sections 1, 4, and 5 describe changes that may affect
local system processing of OCLC-MARC records.
Route to
Local system, OCLC Cataloging, OCLC Interlibrary Loan, and OCLC Union List™ service staff.
Online installation
Changes will be installed in December 2000. OCLC will notify
you about installation and conversions via a logon Message-of-the-Day.
-
The only changes immediately apparent are the changes in LCCN
and ISSN searching.
-
Control numbers in the new formats may appear in December, depending
on when users start entering them.
- Conversions to move some national library control numbers to appropriate
fields will follow the December installation.
Documentation affected
OCLC Cataloging
Service User Guide
OCLC Union List User Guide
1 Library of Congress Control Number
LCCN format
The Library of Congress Control Number (LCCN) format will change. The year
will increase from 2 to 4 digits. The LCCN remains 12 characters. The 3-character
prefix will be replaced by a 2-character prefix that can contain alphabetic
characters or blanks. The supplement blank at the end of the field will be
eliminated.
Issue date
The Library of Congress plans to begin issuing control numbers in the new
format effective January 2001.
Old and new LCCN formats
The table below compares the old and new LCCN formats.
| |
Current Format (old) |
Format Beginning in 2001 |
| Bytes/Position |
No. of Bytes |
Position |
No. of Bytes |
Position |
| Alphabetic Prefix |
3 |
00-02 |
2 |
00-01 |
| Year |
2 |
03-04 |
4 |
02-05 |
| Serial Number |
6 |
05-10 |
6 |
06-11 |
| Supplement Blank |
1 |
11 |
N/A |
N/A |
Suffix/Alphabetic Identifier
And/or Revision Date |
Variable |
12-n |
N/A |
N/A |
LCCNs in bibliographic records
The table below compares the old and new LCCN formats for bibliographic
records. LCCNs display with the hyphen. Continue to enter the hyphen in bibliographic
records.
| Old LCCN format (assigned before 2001) |
| Example |
MARC display |
MARC output |
| No prefix |
95-1234 |
|||95001234| |
| 1 character prefix |
a99-1234 |
a||99001234| |
| 2 character prefix |
sn98-5934 |
sn|98005934| |
| 3 character prefix* |
abc98-123456 |
abc98123456| |
| Suffix* |
74-266//r892 |
|||74000266|//r892 |
| *These will not be used effective January 2001. |
| New LCCN format (assigned beginning 2001) |
| Example |
MARC display |
MARC output |
| No prefix |
2001-1234 |
||2001001234 |
| 1 character prefix |
a2010-1234 |
||2001001234 |
| 2 character prefix |
sn2001-5934 |
sn2001005934 |
| Note:|=blank |
LCCNs in authority records
LCCNs in authority records continue to display without the hyphen. The only
change is that the new format adds the 4-digit year. LCCNs in authority records
will be system-generated in the new format. Below are examples of the old
and new format displays. The year section is highlighted in boldface.
| Old authority record display |
New authority record display |
| n 79051955 |
n 2001050268 |
LCCNs in authority records in CORC
In CORC, LCCNs in authority records continue to display with the hyphen.
Processing of old and new formats
The table below describes processing of old and new format LCCNs in authority
records.
| Processing |
Old format |
New format |
| Searching, indexing, matching, retrieval, and display |
Yes |
Yes |
| Number retained? |
Yes, even if Library of Congress reissues record |
Yes |
| Note: Old and new formats will be mixed in the OCLC
databases and even in a single occurrence of field 010. |
Field 010 and LCCNs
All LCCNs display and are input and output in field 010. Field 010 is restricted
for LCCNs and National Library of Canada serials control numbers. Other control
numbers are no longer allowed in field 010. Control numbers other than LCCNs
that are in field 010 will be moved to other fields.
Suffix and revision information
The Library of Congress no longer uses suffixes and revision information.
OCLC will remove all occurrences of suffixes and revision information from
field 010. Do not input suffix and revision information in the 010 field.
2 LCCN Searching Change
Troublespot: changed LCCN bibliographic search
When searching for LCCNs in bibliographic records with the fin command and
the LCCN index label (ln), include the hyphen. (Previously including the hyphen
was optional.) The table below describes bibliographic searching.
| If you search |
You are searching |
Use hyphen? |
Example |
Changed? |
| With fin command and index label ln |
Numeric LCCN index |
Yes |
fin ln 78-52051 |
Yes |
| Without fin command and index label ln |
Numeric LCCN index |
Yes |
78-52051 |
No |
Troublespot: changed LCCN authority search
When searching for LCCNs in authority records using the bracket, include
the hyphen. (Previously including the hyphen was optional.) The table below
describes the authority searching.
| If you search |
You are searching |
Use hyphen? |
Example |
Changed? |
| With fin command and index label ln |
Numeric LCCN index |
Yes |
fin ln 78-52051 |
Yes |
| With bracket |
Numeric LCCN index |
Yes |
[78-52051 |
Yes |
3 ISSN Searching Changes
ISSN and searching
This section describes the change to ISSN searching that results from the
new LCCN format. Since the new format for LCCNs may look like an International
Standard Serial Number (ISSN), you must search for ISSNs differently.
Troublespot: changed ISSN search
When not using the fin command and index label to search the numeric
ISSN index, omit the hyphen in the ISSN.
| If you search |
You are searching |
Use hyphen? |
Example |
Changed? |
| Without fin command and index label |
Numeric ISSN index |
No |
12345678 |
Yes |
Unchanged ISSN search
The table below describes unchanged ISSN searches.
| If you search |
You are searching |
Use hyphen? |
Example |
Changed? |
| With fin sn |
Numeric ISSN index |
Optional |
fin sn 12345678
fin sn 1234-5678 |
No |
| With fin nn |
Keyword standard no. index |
Yes |
fin nn 1234-5678 |
No |
ISSN searching in OCLC services
The table below describes ISSN searching in OCLC services.
| OCLC service |
Name of search |
Index searched |
Use fin and index label? |
Use hyphen? |
Example |
Cataloging
ILL
Union list
|
ISSN (sn) |
ISSN numeric |
No |
No |
12345678 |
| Yes |
Optional |
fin sn 1234-5678
fin sn 12345678 |
| Keyword standard no. (nn) |
Keyword standard no. |
Yes |
Yes |
fin nn 1234-5678 |
| Z39.50 cataloging |
ISSN |
ISSN |
N/A |
Yes |
1234-5678 |
| Standard no. |
Standard no. |
| CatExpress |
ISSN (ns) |
Keyword |
Index labels can be used. Do not use the fin command. |
Yes |
1234-5678
sn: 1234-5678 |
| Standard no. (sn) |
| Note: In CatExpress the sn index label
searches the keyword index, not the ISSN numeric index. |
ISSN searching in CORC
The table below describes ISSN searching in CORC.
| Database |
Name of search |
Index searched |
Use index label? |
Use hyphen? |
Example |
| WorldCat |
ISSN numeric (sn) |
ISSN numeric |
No |
No |
12345678 |
| Yes |
Optional |
sn 1234-5678
sn 12345678 |
| Keyword standard no. (nn) |
Keyword standard no. |
Yes |
Yes |
nn 1234-5678 |
| Resource Catalog |
Standard no. |
Resource Catalog standard no. |
No |
Yes |
0272-0097 |
| Note: The fin command cannot be used
in CORC, regardless of database searched. |
4 Non-LC National Library Control Numbers
Field 010 use restricted
Only Library of Congress control numbers are input, stored, and displayed
in field 010.
Exception: For CONSER purposes, serial records from the National
Library of Canada contain National Library of Canada control numbers in the
field 010.
Field 016
Field 016 is used for other national library control numbers and has been
renamed and redefined. Field 016 is also part of the Standard Number index.
The table below describes field 016.
| User actions on locked records |
User actions when local editing unlocked records |
Enrichment replace |
Catalog cards |
| Add, modify, or delete field 016 if users are authorized to lock and
replace the record (enhance, CONSER, minimal-level upgrade, or member
own replace) |
Add, modify, or delete the field while local editing an unlocked record
|
Users may not input, modify, or delete for an enrichment replace, e.g.,
add subject headings or class numbers |
016 does not print on catalog cards |
Merging duplicates and field 016
The new field 016 is added to the retained record whenever it is different.
The table below contains the merging rules for 016 fields.
| Records with |
Merged record contains |
| Control numbers from different national libraries |
Both numbers |
| Different control numbers from the same national library |
Both numbers |
| Identical national library control numbers |
Both numbers |
Field 029
The table below describes field 029.
| Defined by |
Format |
Used by |
Control numbers contained |
OCLC
(for OCLC use only) |
Free form. The field contains the number the library sends and the source
of the number |
OCLC Batchload service to match correction records with original record |
National Library of Medicine
British Library
National Library of Australia
National Library of Canada
National Library of New Zealand
OCLC PromptCat® vendor numbers |
British Library control number format
The British Library control number format was changed to add an alphabetic
decade counter in January 2000. These numbers are stored in field 029. British
Library control numbers formerly located in field 010 have been moved to field
029 and will also be copied to field 016. British Library control numbers
are also present in the 015 field.
| Old location |
New location |
| 010 |
016, 029 (also in 015) |
Old and new British Library control number formats
The table below compares the old and new British Library Control Number
formats. OCLC will not convert British Library Control Numbers from one format
to another. All of the formats listed below may occur in the system.
| |
Pre-1992 |
1992-1999 |
2000 - |
| Position 1 |
b |
b |
b |
| Position 2 |
1st digit of year |
1st digit of year |
Alpha decade counter |
| Position 3 |
2nd digit of year |
2nd digit of year |
Year digit |
| Positions 4-8 |
Digits |
Mix of digits & alphas |
Mix of digits & alphas |
| Example |
b7001391 |
b96Y4350 |
bC5A4350 |
National Library of Canada control number format
National Library of Canada control numbers will be stored in field 029 and
field 016, effective January 2001. All occurrences of National Library of
Canada control numbers in field 010 will be moved to fields 029 and 016. National
Library of Canada serial control numbers remain in field 010 and 016.
| Record type |
Old field |
New field |
| Serial |
010, 016 |
010, 016 |
| Non Serial |
010 |
016, 029 |
Old and new National Library of Canada control number formats
The table below compares the old and new National Library of Canada control
number formats. Both old and new format control numbers occur in the system.
| |
Current Format (old) |
Format Beginning in 2001 |
| Bytes/Position |
No. of Bytes |
Position |
No. of Bytes |
Position |
| Blank |
1 |
00 |
Not used |
Not used |
| Year |
2 |
01-02 |
4 |
00-03 |
| Number |
6 |
03-08 |
6 |
04-10 |
| Check Digit |
1 |
09 |
1 |
10 |
| Language Code |
1 |
10 |
1 |
11 |
| Blank |
1 |
11 |
Not used |
Not used |
| Revision indicator |
n |
12-n |
n |
12-n |
| Display Example |
009801421E |
20019200304F |
National Library of Medicine control number format
Historically, National Library of Medicine (NLM) control numbers have been
stored in fields 029 and 016. NLM control numbers in field 069 will be moved
to field 016. If the record contains multiple 069 fields, multiple 016 fields
will be created. The NLM control numbers in field 029 are not affected by
this change.
| Old location |
New location |
| 029 |
029 |
| 069 |
016 |
Old and new National Library of Medicine control number formats
The table below compares the old and new National Library of Medicine control
number formats. The format of NLM control numbers changed in 1998. Both old
and new format numbers occur in the system.
| Pre 1998 (old ) |
1998 - (new) |
nnnnnnn (7 numerals)
nnnnnnnn (8 numerals)
nnnnnnna (7 numerals + 1 alphabetic character)
nnnnnnnna (8 numerals + 1 alphabetic character)
|
nnnnnnnnn (9 numerals) |
Field 069
OCLC used field 069 to record National Library of Medicine control numbers
for record matching when batchloading NLM files. OCLC no longer requires field
069 for matching. Field 069 will be deleted from all records and the control
numbers moved to field 016.
National Library of Australia control number format
The National Library of Australia (AUT) control numbers are carried and
indexed solely as text in field 029. They are not in field 010. National Library
of Australia numbers will also be copied to field 016.
5 National Library Control Number Changes and OCLC Products
and Services
OCLC products and services
All OCLC systems and services that supply OCLC-MARC records will support
both old and new national library control number formats. All OCLC systems
and services support indexing, searching, matching, and retrieval for both
old and new format LCCNs. OCLC will not convert LCCNs. LCCNs issued prior
to 2001 have the 2-digit year. LCCNs issued starting in 2001 have the 4-digit
year.
OCLC Cataloging Express™ service
CatExpress users will be able to search the Standard Number index and the
LCCN index using both the old and new format. OCLC recommends searching
with the hyphen and without internal zeros to ensure more complete retrieval.
Example: 2001-12345
Note: Searching without the hyphen and with internal zeros will produce
incomplete results
Cataloging Micro Products
OCLC CatME™ for Windows and OCLC CJK™ software users must begin
searching the LCCN and ISSN indexes as described in section 2 and 3 immediately
after the December installation.
OCLC CatME version 1.20 and OCLC CJK version 3.10 will incorporate the changes
to the display of the LCCN. OCLC expects to release these new versions in
December 2000. Previous versions of OCLC CatME and OCLC CJK will not display
the new format LCCNs correctly.
OCLC CatCD® for Windows will be updated later.
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