Authority control field elements
Each control field contains alphanumeric data. Specific data elements are identified by position within the control field, not by subfield codes and delimiters. Control fields may not be repeated in the authority record. Each control field is followed by a field terminator.
In OCLC-MARC Records, any element, value, field, subfield, etc., marked obsolete is no longer valid. Current records will not contain these invalid codes. However, previously exported records may contain obsolete MARC coding.
Ind = Indicator | SFC = Subfield code | R = Repeatable | NR = Nonrepeatable | 
= Blank
Tags 001-005
Mnemonics that appear on workforms and record displays follow the leader label.
| Tag | Byte | Value | Definition |
|---|---|---|---|
| 001 | Control Number (NR) | ||
| 00-02 | oca OCLC designation | ||
| 03-10 |
Authority record number (ARN)
|
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| 11 | Blank | ||
| 003 |
Control Number Identifier (NR)
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| 005 |
Date and Time of Latest Transaction (NR)
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| 00-03 | Year | ||
| 04-05 | Month | ||
| 06-07 | Day | ||
| 08-09 | Hour | ||
| 10-11 | Minute | ||
| 12-13 | Second | ||
| 14 | Decimal point | ||
| 15 |
Decimal second
|
Tag 008
| Tag | Byte | Value | Definition |
|---|---|---|---|
| 008 |
Fixed-Length Data Elements—General Information (NR)
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| 00-05 | Date Entered on File (Entered) | ||
| 06 | Direct or Indirect Geographic Subdivision (Geo subd) | ||
| ■ | Fill character | ||
|
Not subdivided geographically | ||
| i | Subdivided geographically—indirect | ||
| n | Not applicable | ||
| 07 | Romanization Scheme (Roman) | ||
| ■ | Fill character | ||
| c | Converted to Pinyin | ||
| n | Not converted to Pinyin | ||
| 08 | Blank | ||
| 09 | Kind of Record (Auth/ref) | ||
| a | Established heading | ||
| b | Untraced reference | ||
| c | Traced reference | ||
| d | Subdivision | ||
| 10 | Descriptive Cataloging Rules (Rules) | ||
| a | Earlier rules | ||
| b | AACR1 | ||
| c | AACR2 | ||
| d | AACR2 compatible heading | ||
| n | Not applicable | ||
| 11 | Subject Heading System/Thesaurus (Subj) | ||
| a | Library of Congress Subject Headings | ||
| b | LC subject headings for children’s literature | ||
| n | Not applicable | ||
| 12 | Type of Series (Series) | ||
| a | Monographic series | ||
| b | Multipart item | ||
| c | Series-like phrase | ||
| n | Not applicable | ||
| z | Other | ||
| 13 | Numbered/Unnumbered Series (Ser num) | ||
| a | Numbered | ||
| b | Unnumbered | ||
| c | Numbering varies | ||
| n | Not applicable | ||
| 14 | Heading Use—Main or Added Entry (Name use) | ||
| a | Appropriate as main or added entry | ||
| b | Not appropriate as main or added entry | ||
| 15 | Heading Use—Subject Added Entry (Subj use) | ||
| a | Appropriate as subject added entry | ||
| b | Not appropriate as subject added entry | ||
| 16 | Heading Use—Series Added Entry (Ser use) | ||
| a | Appropriate as series added entry | ||
| b | Not appropriate as series added entry | ||
| 17 | Type of Subject Subdivision (Subdiv tp) | ||
| ■ | Fill character | ||
|
Undefined
|
||
| n | Not applicable | ||
| 18-27 | Blanks | ||
| 28 | Type of Government Agency (Govt agn) | ||
| ■ | Fill character | ||
|
Not a government agency | ||
| a | Autonomous or semi-autonomous component of Malaysia | ||
| c | Multilocal | ||
| f | Federal/national | ||
| i | International/intergovernmental | ||
| l | Local | ||
| m | Multistate | ||
| o | Government agency—type undetermined | ||
| s | State, provincial, territorial, dependent, etc | ||
| u | Unknown if heading is a government agency | ||
| z | Other | ||
| 29 | Reference Evaluation (Ref status) | ||
| a | Tracings are consistent with heading | ||
| b | Tracings are not necessarily consistent with heading | ||
| n | Not applicable | ||
| 30 | Blank | ||
| 31 | Record Update in Process (Upd status) | ||
| a | Record can be used | ||
| b | Record is being updated | ||
| 32 | Undifferentiated Personal Name (Name) | ||
| a | Differentiated personal name | ||
| b | Undifferentiated personal name | ||
| n | Not applicable | ||
| 33 | Level of Establishment (Auth status) | ||
| a | Fully established heading | ||
| b | Memorandum | ||
| c | Provisional | ||
| d | Preliminary | ||
| n | Not applicable | ||
| 34-37 | Blanks | ||
| 38 | Modified Record (Mod rec) | ||
|
Not modified | ||
| 39 | Cataloging Source (Source) | ||
|
National bibliographic agency | ||
| a |
LC shared cataloging for the National Agricultural Library (DNAL)
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| b |
LC shared cataloging for the National Library of Medicine (DNLM)
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| c | Cooperative cataloging program |