Die Datensatzkennung (engl. Leader) ist ein festes Feld, welches die ersten 24 Zeichenpositionen (00-23) jedes Datensatzes umfasst und Informationen für die Verarbeitung des Datensatzes enthält.
| Position |
Beschreibung (Englisch / Deutsch)
|
| 00-04 |
Record length / Länge des Datensatzes
|
| Diese Positionen enthalten eine vom Rechner erzeugte fünfstellige numerische Zeichenfolge, welche die Länge des gesamten Datensatzes angibt. Die Nummer ist rechtsbündig, wobei linksseitig fehlende Positionen mit Nullen besetzt sind.
|
| 05 |
Record status / Datensatzstatus
|
| a |
Increase in encoding level / Erhöhte Kodierungsebene
|
| c |
Corrected or revised / Korrigiert oder überarbeitet
|
| d |
Deleted / Gelöscht
|
| n |
New / Neu
|
| p |
Increase in encoding level from prepublication / Erhöhung der Kodierung seit der Vollpublikation
|
|
| 06 |
Type of record / Art des Datensatzes
|
| a |
Language material /
|
| c |
Notated music /
|
| d |
Manuscript notated music /
|
| e |
Cartographic material /
|
| f |
Manuscript cartographic material /
|
| g |
Projected medium /
|
| i |
Nonmusical sound recording /
|
| j |
Musical sound recording /
|
| k |
Two-dimensional nonprojectable graphic /
|
| m |
Computer file /
|
| o |
Kit /
|
| p |
Mixed materials /
|
| r |
Three-dimensional artifact or naturally occurring object /
|
| t |
Manuscript language material /
|
|
| 07 |
Bibliographic level /
|
| a |
Monographic component part /
|
| b |
Serial component part /
|
| c |
Collection /
|
| d |
Subunit /
|
| i |
Integrating resource /
|
| m |
Monograph/Item /
|
| s |
Serial /
|
|
| 08 |
Type of control /
|
| # |
No specified type /
|
| a |
Archival /
|
|
| 09 |
Character coding scheme /
|
| # |
MARC-8 /
|
| a |
UCS/Unicode /
|
|
| 10 |
Indicator count /
|
| 2 |
Number of character positions used for indicators /
|
|
| 11 |
Subfield code count /
|
| 2 |
Number of character positions used for a subfield code /
|
|
| 12-16 |
Base address of data /
|
| [number] |
Length of Leader and Directory /
|
|
| 17 |
Encoding level /
|
| # |
Full level /
|
| 1 |
Full level, material not examined /
|
| 2 |
Less-than-full level, material not examined /
|
| 3 |
Abbreviated level /
|
| 4 |
Core level /
|
| 5 |
Partial (preliminary) level /
|
| 7 |
Minimal level /
|
| 8 |
Prepublication level /
|
| u |
Unknown /
|
| z |
Not applicable /
|
|
| 18 |
Descriptive cataloging form
|
| # |
Non-ISBD /
|
| a |
AACR 2 /
|
| c |
ISBD punctuation omitted /
|
| i |
ISBD punctuation included /
|
| n |
Non-ISBD punctuation omitted /
|
| u |
Unknown /
|
|
| 19 |
Multipart resource record level /
|
| # |
Not specified or not applicable /
|
| a |
Set /
|
| b |
Part with independent title /
|
| c |
Part with dependent title /
|
|
| 20 |
Length of the length-of-field portion /
|
| 4 |
Number of characters in the length-of-field portion of a Directory entry /
|
|
| 21 |
Length of the starting-character-position portion /
|
| 5 |
Number of characters in the starting-character-position portion of a Directory entry /
|
|
| 22 |
Length of the implementation-defined portion /
|
| 0 |
Number of characters in the implementation-defined portion of a Directory entry /
|
|
| 23 |
Undefined /
|
|
|
(Stand: 21.2.2109)
Weblinks
| Herausgeber |
Sprache |
Webseitentitel |
Anmerkungen |
 Library of Congress |
eng |
Leader (NR)wbm |
Offizielle Webseite |
Library of Congress